Southern Power 10-Q2 Aug 232023 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page	6 Months Ended
Cover Page	Jun. 30, 2023 shares
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	1-3526
Entity Registrant Name	The Southern Company
Entity Tax Identification Number	58-0690070
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	30 Ivan Allen Jr. Boulevard, N.W.
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30308
City Area Code	404
Local Phone Number	506-5000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	1,090,546,579
Entity Central Index Key	0000092122
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Common Stock, par value $5 per share
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $5 per share
Trading Symbol	SO
Security Exchange Name	NYSE
Series 2017B 5.25% Junior Subordinated Notes due 2077
Document Information [Line Items]
Title of 12(b) Security	Series 2017B 5.25% Junior Subordinated Notes due 2077
Trading Symbol	SOJC
Security Exchange Name	NYSE
Series 2020A 4.95% Junior Subordinated Notes due 2080
Document Information [Line Items]
Title of 12(b) Security	Series 2020A 4.95% Junior Subordinated Notes due 2080
Trading Symbol	SOJD
Security Exchange Name	NYSE
Series 2020C 4.20% Junior Subordinated Notes due 2060
Document Information [Line Items]
Title of 12(b) Security	Series 2020C 4.20% Junior Subordinated Notes due 2060
Trading Symbol	SOJE
Security Exchange Name	NYSE
Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081
Document Information [Line Items]
Title of 12(b) Security	Series 2021B 1.875% Fixed-to-Fixed Reset Rate Junior Subordinated Notes due 2081
Trading Symbol	SO 81
Security Exchange Name	NYSE
ALABAMA POWER CO
Document Information [Line Items]
Entity File Number	1-3164
Entity Registrant Name	Alabama Power Company
Entity Tax Identification Number	63-0004250
Entity Incorporation, State or Country Code	AL
Entity Address, Address Line One	600 North 18th Street
Entity Address, City or Town	Birmingham
Entity Address, State or Province	AL
Entity Address, Postal Zip Code	35203
City Area Code	205
Local Phone Number	257-1000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	30,537,500
Entity Central Index Key	0000003153
GEORGIA POWER CO
Document Information [Line Items]
Entity File Number	1-6468
Entity Registrant Name	Georgia Power Company
Entity Tax Identification Number	58-0257110
Entity Incorporation, State or Country Code	GA
Entity Address, Address Line One	241 Ralph McGill Boulevard, N.E.
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30308
City Area Code	404
Local Phone Number	506-6526
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	9,261,500
Entity Central Index Key	0000041091
GEORGIA POWER CO \| Series 2017A 5.00% Junior Subordinated Notes due 2077
Document Information [Line Items]
Title of 12(b) Security	Series 2017A 5.00% Junior Subordinated Notes due 2077
Trading Symbol	GPJA
Security Exchange Name	NYSE
MISSISSIPPI POWER CO
Document Information [Line Items]
Entity File Number	001-11229
Entity Registrant Name	Mississippi Power Company
Entity Tax Identification Number	64-0205820
Entity Incorporation, State or Country Code	MS
Entity Address, Address Line One	2992 West Beach Boulevard
Entity Address, City or Town	Gulfport
Entity Address, State or Province	MS
Entity Address, Postal Zip Code	39501
City Area Code	228
Local Phone Number	864-1211
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	1,121,000
Entity Central Index Key	0000066904
SOUTHERN POWER CO
Document Information [Line Items]
Entity File Number	001-37803
Entity Registrant Name	Southern Power Company
Entity Tax Identification Number	58-2598670
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	30 Ivan Allen Jr. Boulevard, N.W.
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30308
City Area Code	404
Local Phone Number	506-5000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	1,000
Entity Central Index Key	0001160661
SOUTHERN POWER CO \| Series 2016B 1.850% Senior Notes due 2026
Document Information [Line Items]
Title of 12(b) Security	Series 2016B 1.850% Senior Notes due 2026
Trading Symbol	SO/26A
Security Exchange Name	NYSE
SOUTHERN Co GAS
Document Information [Line Items]
Entity File Number	1-14174
Entity Registrant Name	Southern Company Gas
Entity Tax Identification Number	58-2210952
Entity Incorporation, State or Country Code	GA
Entity Address, Address Line One	Ten Peachtree Place, N.E.
Entity Address, City or Town	Atlanta
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30309
City Area Code	404
Local Phone Number	584-4000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	100
Entity Central Index Key	0001004155

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - Southern - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues:
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Operating Expenses:
Other operations and maintenance	1,489	1,548	2,929	3,042
Depreciation and amortization	1,112	913	2,222	1,805
Taxes other than income taxes	340	349	734	721
Estimated loss on Plant Vogtle Units 3 and 4	0	52	0	52
Total operating expenses	4,458	5,551	9,719	10,815
Operating Income	1,290	1,655	2,509	3,039
Other Income and (Expense):
Allowance for equity funds used during construction	70	53	135	104
Earnings from equity method investments	29	34	78	80
Interest expense, net of amounts capitalized	(610)	(488)	(1,192)	(950)
Other income (expense), net	142	139	286	283
Total other income and (expense)	(369)	(262)	(693)	(483)
Earnings Before Income Taxes	921	1,393	1,816	2,556
Income taxes (benefit)	98	304	194	477
Net Income	823	1,089	1,622	2,079
Dividends on preferred stock of subsidiaries	0	4	0	7
Net loss attributable to noncontrolling interests	(15)	(22)	(78)	(67)
Net Income	$ 838	$ 1,107	$ 1,700	$ 2,139
Earnings per share -
Basic (in dollars per share)	$ 0.77	$ 1.04	$ 1.56	$ 2.01
Diluted (in dollars per share)	$ 0.76	$ 1.03	$ 1.55	$ 2
Average number of shares of common stock outstanding — (in millions)
Basic (in shares)	1,092	1,065	1,092	1,064
Diluted (in shares)	1,098	1,072	1,098	1,070
Retail electric revenues
Operating Revenues:
Total operating revenues	$ 3,859	$ 4,789	$ 7,458	$ 8,402
Wholesale electric revenues
Operating Revenues:
Total operating revenues	605	937	1,203	1,601
Other electric revenues
Operating Revenues:
Total operating revenues	209	192	399	370
Natural Gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Natural gas
Operating Expenses:
Total cost of sales	199	452	1,097	1,546
Other revenues
Operating Revenues:
Total operating revenues	223	205	440	341
Operating Expenses:
Total cost of sales	128	114	255	183
Fuel
Operating Expenses:
Total cost of sales	959	1,715	2,009	2,826
Purchased power
Operating Expenses:
Total cost of sales	$ 231	$ 408	$ 473	$ 640

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Income (Unaudited) - Southern (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Natural Gas
Total operating revenues	852	1,083	2,728	3,140
Alternative revenue programs
Total operating revenues	$ 0	$ 2	$ 11	$ 1

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 823	$ 1,089	$ 1,622	$ 2,079
Qualifying hedges:
Changes in fair value, net of tax	28	(45)	(36)	(26)
Reclassification adjustment for amounts included in net income, net of tax	15	54	34	74
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	2	0	5
Total other comprehensive income (loss)	43	11	(2)	53
Comprehensive Income	866	1,100	1,620	2,132
Dividends on preferred stock of subsidiaries	0	4	0	7
Comprehensive loss attributable to noncontrolling interests	(15)	(22)	(78)	(67)
Comprehensive Income	$ 881	$ 1,118	$ 1,698	$ 2,192

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Changes in fair value, tax	$ 9	$ (15)	$ (14)	$ (7)
Qualifying hedges, reclassification adjustment, tax	6	17	13	24
Reclassification adjustment for amounts included in net income, tax	$ 0	$ 1	$ 0	$ 2

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - Southern - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Consolidated net income	$ 1,622	$ 2,079
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,436	1,995
Deferred income taxes	(34)	240
Utilization of federal investment tax credits	110	281
Allowance for equity funds used during construction	(135)	(104)
Pension, postretirement, and other employee benefits	(245)	(211)
Settlement of asset retirement obligations	(276)	(198)
Stock based compensation expense	111	100
Estimated loss on Plant Vogtle Units 3 and 4	0	52
Storm damage accruals	27	107
Natural gas cost under recovery – long-term	0	192
Retail fuel cost under recovery – long-term	108	(729)
Other, net	(50)	34
Changes in certain current assets and liabilities —
Receivables	735	(637)
Prepayments	(64)	(90)
Fossil fuel stock	(308)	20
Materials and supplies	(202)	(109)
Natural gas for sale, net of temporary LIFO liquidation	196	335
Other current assets	103	(101)
Accounts payable	(997)	703
Accrued compensation	(378)	(260)
Customer refunds	(121)	0
Natural gas cost over recovery	161	0
Other current liabilities	101	(120)
Net cash provided from operating activities	2,900	3,579
Investing Activities:
Property additions	(3,898)	(3,213)
Nuclear decommissioning trust fund purchases	(726)	(628)
Nuclear decommissioning trust fund sales	720	624
Proceeds from dispositions	126	119
Cost of removal, net of salvage	(270)	(377)
Construction payables	(140)	(3)
Other investing activities	(100)	18
Net cash used for investing activities	(4,288)	(3,460)
Financing Activities:
Increase (decrease) in notes payable, net	(375)
Increase (decrease) in notes payable, net		263
Proceeds —
Long-term debt	5,541	2,200
Short-term borrowings	250	1,200
Common stock	22	61
Redemptions and repurchases —
Long-term debt	(1,300)	(1,851)
Short-term borrowings	(850)	(400)
Capital contributions from noncontrolling interests	21	73
Distributions to noncontrolling interests	(87)	(115)
Payment of common stock dividends	(1,506)	(1,425)
Other financing activities	(121)	(219)
Net cash provided from (used for) financing activities	1,595	(213)
Net Change in Cash, Cash Equivalents, and Restricted Cash	207	(94)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,244	1,735
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,043	836
Income taxes, net	(40)	157
Noncash transactions —
Accrued property additions at end of period	810	837
Right-of-use assets obtained under operating leases	44	13
Right-of-use assets obtained under finance leases	1	2
Reassessment of right-of-use assets under operating leases	$ 0	$ 40

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows (Unaudited) - Southern (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Statement of Cash Flows [Abstract]
Net cash paid for capitalized interest	$ 66	$ 46

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - Southern - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 2,123	$ 1,917
Receivables —
Customer and affiliated accounts, net	1,852	2,128
Unbilled revenues	682	1,012
Under recovered fuel clause revenues	728	10
Other accounts and notes	568	637
Accumulated provision for uncollectible accounts	(84)	(71)
Materials and supplies	1,846	1,664
Fossil fuel for generation	883	575
Natural gas for sale	234	438
Prepaid expenses	504	347
Assets from risk management activities, net of collateral	51	115
Regulatory assets – asset retirement obligations	352	332
Natural gas cost under recovery	0	108
Other regulatory assets	930	860
Other current assets	310	344
Total current assets	10,979	10,416
Property, Plant, and Equipment:
In service	119,852	117,529
Less: Accumulated depreciation	36,500	35,297
Plant in service, net of depreciation	83,352	82,232
Other utility plant, net	546	599
Nuclear fuel, at amortized cost	877	843
Construction work in progress	11,992	10,896
Total property, plant, and equipment	96,767	94,570
Other Property and Investments:
Goodwill	5,161	5,161
Nuclear decommissioning trusts, at fair value	2,298	2,145
Equity investments in unconsolidated subsidiaries	1,382	1,443
Other intangible assets, net of amortization	386	406
Miscellaneous property and investments	618	602
Total other property and investments	9,845	9,757
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,481	1,531
Deferred charges related to income taxes	892	866
Prepaid pension costs	2,478	2,290
Unamortized loss on reacquired debt	229	238
Deferred under recovered fuel clause revenues	1,489	2,056
Regulatory assets – asset retirement obligations, deferred	5,681	5,764
Other regulatory assets, deferred	5,806	5,918
Other deferred charges and assets	1,469	1,485
Total deferred charges and other assets	19,525	20,148
Total Assets	137,116	134,891
Current Liabilities:
Securities due within one year	4,063	4,285
Notes payable	1,647	2,609
Accounts payable	2,493	3,525
Customer deposits	493	502
Accrued taxes —
Accrued income taxes	76	60
Other accrued taxes	627	764
Accrued interest	652	614
Accrued compensation	719	1,127
Asset retirement obligations	715	694
Liabilities from risk management activities, net of collateral	261	178
Operating lease obligations	195	197
Natural gas cost over recovery	161	0
Other regulatory liabilities	268	382
Other current liabilities	870	787
Total current liabilities	13,240	15,724
Long-term Debt	55,134	50,656
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,623	10,036
Deferred credits related to income taxes	4,965	5,235
Accumulated deferred ITCs	2,091	2,133
Employee benefit obligations	1,217	1,238
Operating lease obligations, deferred	1,356	1,388
Asset retirement obligations, deferred	10,127	10,146
Other cost of removal obligations	1,932	1,903
Other regulatory liabilities, deferred	691	733
Other deferred credits and liabilities	1,092	1,167
Total deferred credits and other liabilities	34,094	33,979
Total Liabilities	102,468	100,359
Total Stockholders' Equity	34,648	34,532
Total Liabilities and Stockholders' Equity	$ 137,116	$ 134,891

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) - Southern (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Other intangible assets, amortization	$ 358	$ 340

Condensed Consolidated Statem_7

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - Southern - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2021		1,061
Beginning balance (in shares) at Dec. 31, 2021			(1)
Beginning balance at Dec. 31, 2021	$ 32,276	$ 5,279	$ (47)	$ 11,950	$ 10,929	$ (237)	$ 4,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	987				1,032		(45)
Other comprehensive income	42					42
Stock issued (in shares)		3
Stock issued	38	$ 7		31
Stock-based compensation	6			6
Cash dividends on common stock	(702)				(702)
Capital contributions from noncontrolling interests	73						73
Distributions to noncontrolling interests	(98)						(98)
Other	7		$ (2)	7	2
Ending balance (in shares) at Mar. 31, 2022		1,064
Ending balance (in shares) at Mar. 31, 2022			(1)
Ending balance at Mar. 31, 2022	32,629	$ 5,286	$ (49)	11,994	11,261	(195)	4,332
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	1,085				1,107		(22)
Other comprehensive income	11					11
Stock issued	23	$ 2		21
Stock-based compensation	14			14
Cash dividends on common stock	(723)				(723)
Distributions to noncontrolling interests	(28)						(28)
Other	2		$ (2)	4
Ending balance (in shares) at Jun. 30, 2022		1,064
Ending balance (in shares) at Jun. 30, 2022			(1)
Ending balance at Jun. 30, 2022	33,013	$ 5,288	$ (51)	12,033	11,645	(184)	4,282
Beginning balance (in shares) at Dec. 31, 2022		1,090
Beginning balance (in shares) at Dec. 31, 2022			(1)
Beginning balance at Dec. 31, 2022	34,532	$ 5,417	$ (53)	13,673	11,538	(167)	4,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	799				862		(63)
Other comprehensive income	(44)					(44)
Stock issued (in shares)		2
Stock issued	15	$ 4		11
Stock-based compensation	29			29
Cash dividends on common stock	(742)				(742)
Capital contributions from noncontrolling interests	21						21
Distributions to noncontrolling interests	(48)						(48)
Other	0		$ (2)	2
Ending balance (in shares) at Mar. 31, 2023		1,092
Ending balance (in shares) at Mar. 31, 2023			(1)
Ending balance at Mar. 31, 2023	34,562	$ 5,421	$ (55)	13,715	11,658	(211)	4,034
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	823				838		(15)
Other comprehensive income	43					43
Stock issued	7	$ 1		6
Stock-based compensation	19			19
Cash dividends on common stock	(764)				(764)
Distributions to noncontrolling interests	(42)						(42)
Other	0		$ (1)	2			(1)
Ending balance (in shares) at Jun. 30, 2023		1,092
Ending balance (in shares) at Jun. 30, 2023			(1)
Ending balance at Jun. 30, 2023	$ 34,648	$ 5,422	$ (56)	$ 13,742	$ 11,732	$ (168)	$ 3,976

Condensed Consolidated Statem_8

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - Southern (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 0.70	$ 0.68	$ 0.68	$ 0.66

Condensed Statements of Income

Condensed Statements of Income (Unaudited) - APC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues:
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Operating Expenses:
Other operations and maintenance	1,489	1,548	2,929	3,042
Depreciation and amortization	1,112	913	2,222	1,805
Taxes other than income taxes	340	349	734	721
Total operating expenses	4,458	5,551	9,719	10,815
Operating Income	1,290	1,655	2,509	3,039
Other Income and (Expense):
Allowance for equity funds used during construction	70	53	135	104
Interest expense, net of amounts capitalized	(610)	(488)	(1,192)	(950)
Total other income (expense), net	142	139	286	283
Total other income and (expense)	(369)	(262)	(693)	(483)
Earnings Before Income Taxes	921	1,393	1,816	2,556
Income taxes (benefit)	98	304	194	477
Net income	823	1,089	1,622	2,079
Dividends on preferred stock of subsidiaries	0	4	0	7
Net Income	838	1,107	1,700	2,139
Retail electric revenues
Operating Revenues:
Total operating revenues	3,859	4,789	7,458	8,402
Wholesale electric revenues
Operating Revenues:
Total operating revenues	605	937	1,203	1,601
Other electric revenues
Operating Revenues:
Total operating revenues	209	192	399	370
Natural Gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Other revenues
Operating Revenues:
Total operating revenues	223	205	440	341
Operating Expenses:
Total cost of sales	128	114	255	183
Fuel
Operating Expenses:
Total cost of sales	959	1,715	2,009	2,826
Purchased power
Operating Expenses:
Total cost of sales	231	408	473	640
Alabama Power
Operating Revenues:
Total operating revenues	1,689	1,931	3,336	3,580
Operating Expenses:
Other operations and maintenance	440	441	862	852
Depreciation and amortization	349	218	694	432
Taxes other than income taxes	107	100	223	204
Total operating expenses	1,307	1,376	2,658	2,530
Operating Income	382	555	678	1,050
Other Income and (Expense):
Allowance for equity funds used during construction	21	17	42	33
Interest expense, net of amounts capitalized	(105)	(91)	(208)	(180)
Total other income (expense), net	39	27	79	61
Total other income and (expense)	(45)	(47)	(87)	(86)
Earnings Before Income Taxes	337	508	591	964
Income taxes (benefit)	25	121	23	227
Net income	312	387	568	737
Dividends on preferred stock of subsidiaries	0	4	0	7
Net Income	312	383	568	730
Alabama Power \| Retail electric revenues
Operating Revenues:
Total operating revenues	1,467	1,629	2,848	3,008
Alabama Power \| Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	112	159	252	272
Alabama Power \| Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	10	34	29	100
Alabama Power \| Other revenues
Operating Revenues:
Total operating revenues	100	109	207	200
Alabama Power \| Fuel
Operating Expenses:
Total cost of sales	303	401	611	733
Alabama Power \| Purchased power
Operating Expenses:
Total cost of sales	54	95	155	162
Alabama Power \| Purchased power, affiliates
Operating Expenses:
Total cost of sales	$ 54	$ 121	$ 113	$ 147

Condensed Statements of Compreh

Condensed Statements of Comprehensive Income (Unaudited) - APC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income	$ 823	$ 1,089	$ 1,622	$ 2,079
Qualifying hedges:
Changes in fair value, net of tax	28	(45)	(36)	(26)
Reclassification adjustment for amounts included in net income, net of tax	15	54	34	74
Total other comprehensive income (loss)	43	11	(2)	53
Comprehensive Income	866	1,100	1,620	2,132
Alabama Power
Net income	312	387	568	737
Qualifying hedges:
Changes in fair value, net of tax	0	0	0	(1)
Reclassification adjustment for amounts included in net income, net of tax	0	1	1	2
Total other comprehensive income (loss)	0	1	1	1
Comprehensive Income	$ 312	$ 388	$ 569	$ 738

Condensed Statements of Compr_2

Condensed Statements of Comprehensive Income (Unaudited) - APC (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Changes in fair value, tax	$ 9	$ (15)	$ (14)	$ (7)
Qualifying hedges, reclassification adjustment, tax	6	17	13	24
Alabama Power
Changes in fair value, tax	0	0	0	(1)
Qualifying hedges, reclassification adjustment, tax	$ 0	$ 0	$ 0	$ 1

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows (Unaudited) - APC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Consolidated net income	$ 1,622	$ 2,079
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,436	1,995
Deferred income taxes	(34)	240
Pension, postretirement, and other employee benefits	(245)	(211)
Settlement of asset retirement obligations	(276)	(198)
Other, net	(50)	34
Changes in certain current assets and liabilities —
Receivables	735	(637)
Fossil fuel stock	(308)	20
Prepayments	(64)	(90)
Other current assets	103	(101)
Accounts payable	(997)	703
Accrued compensation	(378)	(260)
Other current liabilities	101	(120)
Net cash provided from operating activities	2,900	3,579
Investing Activities:
Property additions	(3,898)	(3,213)
Nuclear decommissioning trust fund purchases	(726)	(628)
Nuclear decommissioning trust fund sales	720	624
Cost of removal, net of salvage	(270)	(377)
Change in construction payables, net	(140)	(3)
Other investing activities	(100)	18
Net cash used for investing activities	(4,288)	(3,460)
Financing Activities:
Payment of common stock dividends	(1,506)	(1,425)
Other financing activities	(121)	(219)
Net cash provided from (used for) financing activities	1,595	(213)
Net Change in Cash, Cash Equivalents, and Restricted Cash	207	(94)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,244	1,735
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,043	836
Income taxes, net	(40)	157
Noncash transactions —
Accrued property additions at end of period	810	837
Right-of-use assets obtained under finance leases	1	2
Alabama Power
Operating Activities:
Consolidated net income	568	737
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	770	494
Deferred income taxes	(142)	117
Pension, postretirement, and other employee benefits	(91)	(59)
Settlement of asset retirement obligations	(116)	(91)
Retail fuel cost under recovery – long-term	236	(191)
Other, net	(60)	(67)
Changes in certain current assets and liabilities —
Receivables	16	(296)
Fossil fuel stock	(117)	(2)
Prepayments	(61)	(69)
Other current assets	(112)	(31)
Accounts payable	(363)	14
Accrued taxes	183	(15)
Accrued compensation	(76)	(55)
Other current liabilities	21	24
Net cash provided from operating activities	656	510
Investing Activities:
Property additions	(865)	(759)
Nuclear decommissioning trust fund purchases	(150)	(180)
Nuclear decommissioning trust fund sales	150	180
Cost of removal, net of salvage	(83)	(104)
Change in construction payables, net	(79)	(8)
Other investing activities	16	(18)
Net cash used for investing activities	(1,011)	(889)
Financing Activities:
Proceeds — Senior notes	200	700
Other long-term debt	17	0
Senior notes	0	(550)
Capital contributions from parent company	352	656
Payment of common stock dividends	(571)	(508)
Other financing activities	(9)	(71)
Net cash provided from (used for) financing activities	(11)	227
Net Change in Cash, Cash Equivalents, and Restricted Cash	(366)	(152)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	687	1,060
Cash, Cash Equivalents, and Restricted Cash at End of Period	321	908
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	192	166
Income taxes, net	52	192
Noncash transactions —
Accrued property additions at end of period	103	141
Right-of-use assets obtained under operating leases	21	5
Right-of-use assets obtained under finance leases	$ 1	$ 1

Condensed Statements of Cash _2

Condensed Statements of Cash Flows (Unaudited) - APC (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net cash paid for capitalized interest	$ 66	$ 46
Alabama Power
Net cash paid for capitalized interest	$ 13	$ 9

Condensed Balance Sheets (Unaud

Condensed Balance Sheets (Unaudited) - APC - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 2,123	$ 1,917
Receivables —
Customer and affiliated accounts, net	1,852	2,128
Unbilled revenues	682	1,012
Other accounts and notes	568	637
Accumulated provision for uncollectible accounts	(84)	(71)
Fossil fuel for generation	883	575
Materials and supplies	1,846	1,664
Prepaid expenses	504	347
Other regulatory assets	930	860
Other current assets	310	344
Total current assets	10,979	10,416
Property, Plant, and Equipment:
In service	119,852	117,529
Less: Accumulated depreciation	36,500	35,297
Plant in service, net of depreciation	83,352	82,232
Other utility plant, net	546	599
Nuclear fuel, at amortized cost	877	843
Construction work in progress	11,992	10,896
Total property, plant, and equipment	96,767	94,570
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	2,298	2,145
Equity investments in unconsolidated subsidiaries	1,382	1,443
Miscellaneous property and investments	618	602
Total other property and investments	9,845	9,757
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,481	1,531
Deferred charges related to income taxes	892	866
Regulatory assets – asset retirement obligations, deferred	5,681	5,764
Other regulatory assets, deferred	5,806	5,918
Other deferred charges and assets	1,469	1,485
Total deferred charges and other assets	19,525	20,148
Total Assets	137,116	134,891
Current Liabilities:
Securities due within one year	4,063	4,285
Notes payable	1,647	2,609
Accounts payable —
Customer deposits	493	502
Accrued interest	652	614
Accrued compensation	719	1,127
Asset retirement obligations	715	694
Other regulatory liabilities	268	382
Other current liabilities	870	787
Total current liabilities	13,240	15,724
Long-term Debt	55,134	50,656
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,623	10,036
Deferred credits related to income taxes	4,965	5,235
Accumulated deferred ITCs	2,091	2,133
Employee benefit obligations	1,217	1,238
Operating lease obligations, deferred	1,356	1,388
Asset retirement obligations, deferred	10,127	10,146
Other regulatory liabilities, deferred	691	733
Other deferred credits and liabilities	1,092	1,167
Total deferred credits and other liabilities	34,094	33,979
Total Liabilities	102,468	100,359
Total Stockholders' Equity	34,648	34,532
Total Liabilities and Stockholders' Equity	137,116	134,891
Alabama Power
Current Assets:
Cash and cash equivalents	321	687
Receivables —
Unbilled revenues	184	174
Other accounts and notes	98	153
Accumulated provision for uncollectible accounts	(15)	(14)
Fossil fuel for generation	346	229
Materials and supplies	607	557
Prepaid expenses	102	65
Other regulatory assets	513	474
Other current assets	64	67
Total current assets	2,806	2,924
Property, Plant, and Equipment:
In service	34,127	33,472
Less: Accumulated depreciation	10,893	10,470
Plant in service, net of depreciation	23,234	23,002
Other utility plant, net	546	599
Nuclear fuel, at amortized cost	255	239
Construction work in progress	1,600	1,526
Total property, plant, and equipment	25,635	25,366
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,205	1,127
Equity investments in unconsolidated subsidiaries	54	57
Miscellaneous property and investments	126	124
Total other property and investments	1,385	1,308
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	86	71
Deferred charges related to income taxes	259	250
Prepaid pension and other postretirement benefit costs	702	657
Regulatory assets – asset retirement obligations, deferred	1,817	1,845
Other regulatory assets, deferred	1,937	2,107
Other deferred charges and assets	433	442
Total deferred charges and other assets	5,234	5,372
Total Assets	35,060	34,970
Current Liabilities:
Securities due within one year	523	301
Accounts payable —
Customer deposits	105	106
Accrued taxes	217	57
Accrued interest	123	120
Accrued compensation	156	229
Asset retirement obligations	338	330
Other regulatory liabilities	85	96
Other current liabilities	138	91
Total current liabilities	2,348	2,414
Long-term Debt	10,321	10,329
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	4,031	3,981
Deferred credits related to income taxes	1,742	1,925
Accumulated deferred ITCs	78	81
Employee benefit obligations	147	145
Operating lease obligations, deferred	80	67
Asset retirement obligations, deferred	3,896	3,957
Other regulatory liabilities, deferred	290	315
Other deferred credits and liabilities	85	69
Total deferred credits and other liabilities	10,349	10,540
Total Liabilities	23,018	23,283
Total Stockholders' Equity	12,042	11,687
Total Liabilities and Stockholders' Equity	35,060	34,970
Alabama Power \| Nonrelated Party
Receivables —
Customer and affiliated accounts, net	487	431
Accounts payable —
Other	372	641
Alabama Power \| Related Party
Receivables —
Customer and affiliated accounts, net	99	101
Accounts payable —
Other	$ 291	$ 443

Condensed Statements of Common

Condensed Statements of Common Stockholders' Equity (Unaudited) - APC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Alabama Power	Alabama Power Common Stock	Alabama Power Paid-In Capital	Alabama Power Retained Earnings (Accumulated Deficit)	Alabama Power Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2021							31
Beginning balance at Dec. 31, 2021	$ 32,276	$ 5,279	$ 11,950	$ 10,929	$ (237)	$ 10,713	$ 1,222	$ 6,056	$ 3,448	$ (13)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock						347			347
Capital contributions from parent company						626		626
Other comprehensive income	42				42
Cash dividends on common stock	(702)			(702)		(254)			(254)
Ending balance (in shares) at Mar. 31, 2022							31
Ending balance at Mar. 31, 2022	32,629	5,286	11,994	11,261	(195)	11,432	$ 1,222	6,682	3,541	(13)
Beginning balance (in shares) at Dec. 31, 2021							31
Beginning balance at Dec. 31, 2021	32,276	5,279	11,950	10,929	(237)	10,713	$ 1,222	6,056	3,448	(13)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	2,139					730
Ending balance (in shares) at Jun. 30, 2022							31
Ending balance at Jun. 30, 2022	33,013	5,288	12,033	11,645	(184)	11,594	$ 1,222	6,714	3,670	(12)
Beginning balance (in shares) at Mar. 31, 2022							31
Beginning balance at Mar. 31, 2022	32,629	5,286	11,994	11,261	(195)	11,432	$ 1,222	6,682	3,541	(13)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	1,107					383			383
Capital contributions from parent company						32		32
Other comprehensive income	11				11	1				1
Cash dividends on common stock	(723)			(723)		(254)			(254)
Ending balance (in shares) at Jun. 30, 2022							31
Ending balance at Jun. 30, 2022	33,013	5,288	12,033	11,645	(184)	11,594	$ 1,222	6,714	3,670	(12)
Beginning balance (in shares) at Dec. 31, 2022							31
Beginning balance at Dec. 31, 2022	34,532	5,417	13,673	11,538	(167)	11,687	$ 1,222	6,710	3,764	(9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock						255			255
Capital contributions from parent company						330		330
Other comprehensive income	(44)				(44)
Cash dividends on common stock	(742)			(742)		(285)			(285)
Ending balance (in shares) at Mar. 31, 2023							31
Ending balance at Mar. 31, 2023	34,562	5,421	13,715	11,658	(211)	11,987	$ 1,222	7,040	3,734	(9)
Beginning balance (in shares) at Dec. 31, 2022							31
Beginning balance at Dec. 31, 2022	34,532	5,417	13,673	11,538	(167)	11,687	$ 1,222	6,710	3,764	(9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	1,700					568
Ending balance (in shares) at Jun. 30, 2023							31
Ending balance at Jun. 30, 2023	34,648	5,422	13,742	11,732	(168)	12,042	$ 1,222	7,069	3,760	(9)
Beginning balance (in shares) at Mar. 31, 2023							31
Beginning balance at Mar. 31, 2023	34,562	5,421	13,715	11,658	(211)	11,987	$ 1,222	7,040	3,734	(9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	838					312			312
Capital contributions from parent company						29		29
Other comprehensive income	43				43
Cash dividends on common stock	(764)			(764)		(286)			(286)
Ending balance (in shares) at Jun. 30, 2023							31
Ending balance at Jun. 30, 2023	$ 34,648	$ 5,422	$ 13,742	$ 11,732	$ (168)	$ 12,042	$ 1,222	$ 7,069	$ 3,760	$ (9)

Condensed Statements of Incom_2

Condensed Statements of Income (Unaudited) - GPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues:
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Operating Expenses:
Other operations and maintenance	1,489	1,548	2,929	3,042
Depreciation and amortization	1,112	913	2,222	1,805
Taxes other than income taxes	340	349	734	721
Estimated loss on Plant Vogtle Units 3 and 4	0	52	0	52
Total operating expenses	4,458	5,551	9,719	10,815
Operating Income	1,290	1,655	2,509	3,039
Other Income and (Expense):
Allowance for equity funds used during construction	70	53	135	104
Interest expense, net of amounts capitalized	(610)	(488)	(1,192)	(950)
Other income (expense), net	142	139	286	283
Total other income and (expense)	(369)	(262)	(693)	(483)
Earnings Before Income Taxes	921	1,393	1,816	2,556
Income taxes (benefit)	98	304	194	477
Net Income	823	1,089	1,622	2,079
Retail electric revenues
Operating Revenues:
Total operating revenues	3,859	4,789	7,458	8,402
Wholesale electric revenues
Operating Revenues:
Total operating revenues	605	937	1,203	1,601
Other electric revenues
Operating Revenues:
Total operating revenues	209	192	399	370
Natural Gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Other revenues
Operating Revenues:
Total operating revenues	223	205	440	341
Operating Expenses:
Cost of Goods and Services Sold	128	114	255	183
Fuel
Operating Expenses:
Cost of Goods and Services Sold	959	1,715	2,009	2,826
Purchased power
Operating Expenses:
Cost of Goods and Services Sold	231	408	473	640
GEORGIA POWER CO
Operating Revenues:
Total operating revenues	2,391	3,121	4,567	5,328
Operating Expenses:
Other operations and maintenance	496	573	991	1,091
Depreciation and amortization	411	356	819	706
Taxes other than income taxes	132	141	263	265
Estimated loss on Plant Vogtle Units 3 and 4	0	52	0	52
Total operating expenses	1,747	2,319	3,513	4,085
Operating Income	644	802	1,054	1,243
Other Income and (Expense):
Allowance for equity funds used during construction	43	33	83	65
Interest expense, net of amounts capitalized	(160)	(117)	(306)	(224)
Other income (expense), net	36	54	80	103
Total other income and (expense)	(81)	(30)	(143)	(56)
Earnings Before Income Taxes	563	772	911	1,187
Income taxes (benefit)	92	164	144	194
Net Income	471	608	767	993
GEORGIA POWER CO \| Retail electric revenues
Operating Revenues:
Total operating revenues	2,165	2,908	4,146	4,926
GEORGIA POWER CO \| Wholesale electric revenues
Operating Revenues:
Total operating revenues	47	64	78	130
GEORGIA POWER CO \| Other revenues
Operating Revenues:
Total operating revenues	179	149	343	272
GEORGIA POWER CO \| Fuel
Operating Expenses:
Cost of Goods and Services Sold	414	628	816	1,046
GEORGIA POWER CO \| Purchased power
Operating Expenses:
Cost of Goods and Services Sold	142	246	266	396
GEORGIA POWER CO \| Purchased power, affiliates
Operating Expenses:
Cost of Goods and Services Sold	$ 152	$ 323	$ 358	$ 529

Condensed Statements of Compr_3

Condensed Statements of Comprehensive Income (Unaudited) - GPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income	$ 823	$ 1,089	$ 1,622	$ 2,079
Qualifying hedges:
Changes in fair value, net of tax	28	(45)	(36)	(26)
Reclassification adjustment for amounts included in net income, net of tax	15	54	34	74
Total other comprehensive income (loss)	43	11	(2)	53
Comprehensive Income	866	1,100	1,620	2,132
GEORGIA POWER CO
Net income	471	608	767	993
Qualifying hedges:
Changes in fair value, net of tax	0	15	(1)	23
Reclassification adjustment for amounts included in net income, net of tax	1	1	2	3
Total other comprehensive income (loss)	1	16	1	26
Comprehensive Income	$ 472	$ 624	$ 768	$ 1,019

Condensed Statements of Compr_4

Condensed Statements of Comprehensive Income (Unaudited) - GPC (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Changes in fair value, tax	$ 9	$ (15)	$ (14)	$ (7)
Qualifying hedges, reclassification adjustment, tax	6	17	13	24
GEORGIA POWER CO
Changes in fair value, tax	(1)	4	(1)	8
Qualifying hedges, reclassification adjustment, tax	$ 0	$ 0	$ 1	$ 1

Condensed Statements of Cash _3

Condensed Statements of Cash Flows (Unaudited) - GPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Consolidated net income	$ 1,622	$ 2,079
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,436	1,995
Deferred income taxes	(34)	240
Allowance for equity funds used during construction	(135)	(104)
Pension, postretirement, and other employee benefits	(245)	(211)
Settlement of asset retirement obligations	(276)	(198)
Storm damage accruals	27	107
Retail fuel cost under recovery – long-term	108	(729)
Estimated loss on Plant Vogtle Units 3 and 4	0	52
Other, net	(50)	34
Changes in certain current assets and liabilities —
Receivables	735	(637)
Fossil fuel stock	(308)	20
Materials and supplies	(202)	(109)
Other current assets	103	(101)
Accounts payable	(997)	703
Accrued compensation	(378)	(260)
Customer refunds	(121)	0
Other current liabilities	101	(120)
Net cash provided from operating activities	2,900	3,579
Investing Activities:
Property additions	(3,898)	(3,213)
Nuclear decommissioning trust fund purchases	(726)	(628)
Nuclear decommissioning trust fund sales	720	624
Cost of removal, net of salvage	(270)	(377)
Proceeds from dispositions	126	119
Other investing activities	(100)	18
Net cash used for investing activities	(4,288)	(3,460)
Financing Activities:
Increase in notes payable, net		263
Proceeds —
Short-term borrowings	250	1,200
Redemptions and repurchases —
Short-term borrowings	(850)	(400)
Payment of common stock dividends	(1,506)	(1,425)
Other financing activities	(121)	(219)
Net cash provided from (used for) financing activities	1,595	(213)
Net Change in Cash, Cash Equivalents, and Restricted Cash	207	(94)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,244	1,735
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,043	836
Income taxes, net	(40)	157
Noncash transactions —
Accrued property additions at end of period	810	837
Right-of-use assets obtained under operating leases	44	13
GEORGIA POWER CO
Operating Activities:
Consolidated net income	767	993
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	919	803
Deferred income taxes	86	72
Allowance for equity funds used during construction	(83)	(65)
Pension, postretirement, and other employee benefits	(136)	(114)
Settlement of asset retirement obligations	(141)	(91)
Storm damage accruals	16	107
Retail fuel cost under recovery – long-term	(128)	(538)
Estimated loss on Plant Vogtle Units 3 and 4	0	52
Other, net	(34)	7
Changes in certain current assets and liabilities —
Receivables	(35)	(424)
Fossil fuel stock	(166)	31
Materials and supplies	(103)	(46)
Other current assets	34	(25)
Accounts payable	(151)	235
Accrued taxes	(109)	(11)
Accrued compensation	(72)	(50)
Customer refunds	(121)	0
Other current liabilities	33	(10)
Net cash provided from operating activities	576	926
Investing Activities:
Property additions	(2,047)	(1,545)
Nuclear decommissioning trust fund purchases	(576)	(448)
Nuclear decommissioning trust fund sales	570	444
Cost of removal, net of salvage	(127)	(207)
Change in construction payables, net of joint owner portion	(75)	51
Payments pursuant to LTSAs	(40)	(9)
Proceeds from dispositions	56	56
Other investing activities	(21)	(10)
Net cash used for investing activities	(2,260)	(1,668)
Financing Activities:
Increase in notes payable, net	95	0
Proceeds —
Proceeds — Senior notes	1,750	1,500
Revenue bonds	229	0
Short-term borrowings	250	650
Redemptions and repurchases —
Senior notes	(100)	(400)
FFB loan	(43)	(45)
Short-term borrowings	(650)	(250)
Other long-term debt	0	(125)
Capital contributions from parent company	782	491
Payment of common stock dividends	(928)	(845)
Other financing activities	(21)	(37)
Net cash provided from (used for) financing activities	1,364	939
Net Change in Cash, Cash Equivalents, and Restricted Cash	(320)	197
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	480	33
Cash, Cash Equivalents, and Restricted Cash at End of Period	160	230
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	270	188
Income taxes, net	(5)	106
Noncash transactions —
Accrued property additions at end of period	510	500
Right-of-use assets obtained under operating leases	$ 8	$ 1

Condensed Statements of Cash _4

Condensed Statements of Cash Flows (Unaudited) - GPC (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net cash paid for capitalized interest	$ 66	$ 46
GEORGIA POWER CO
Net cash paid for capitalized interest	$ 44	$ 33

Condensed Balance Sheets (Una_2

Condensed Balance Sheets (Unaudited) - GPC - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 2,123	$ 1,917
Receivables —
Customer and affiliated accounts, net	1,852	2,128
Unbilled revenues	682	1,012
Other accounts and notes	568	637
Fossil fuel for generation	883	575
Materials and supplies	1,846	1,664
Regulatory assets – asset retirement obligations	352	332
Other regulatory assets	930	860
Other current assets	310	344
Total current assets	10,979	10,416
Property, Plant, and Equipment:
In service	119,852	117,529
Less: Accumulated depreciation	36,500	35,297
Plant in service, net of depreciation	83,352	82,232
Nuclear fuel, at amortized cost	877	843
Construction work in progress	11,992	10,896
Total property, plant, and equipment	96,767	94,570
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	2,298	2,145
Equity investments in unconsolidated subsidiaries	1,382	1,443
Miscellaneous property and investments	618	602
Total other property and investments	9,845	9,757
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,481	1,531
Deferred charges related to income taxes	892	866
Prepaid pension costs	2,478	2,290
Deferred under recovered fuel clause revenues	1,489	2,056
Regulatory assets – asset retirement obligations, deferred	5,681	5,764
Other regulatory assets, deferred	5,806	5,918
Other deferred charges and assets	1,469	1,485
Total deferred charges and other assets	19,525	20,148
Total Assets	137,116	134,891
Current Liabilities:
Securities due within one year	4,063	4,285
Notes payable	1,647	2,609
Accounts payable —
Customer deposits	493	502
Accrued interest	652	614
Accrued compensation	719	1,127
Operating lease obligations	195	197
Asset retirement obligations	715	694
Other regulatory liabilities	268	382
Other current liabilities	870	787
Total current liabilities	13,240	15,724
Long-term Debt	55,134	50,656
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,623	10,036
Deferred credits related to income taxes	4,965	5,235
Accumulated deferred ITCs	2,091	2,133
Employee benefit obligations	1,217	1,238
Operating lease obligations, deferred	1,356	1,388
Asset retirement obligations, deferred	10,127	10,146
Other deferred credits and liabilities	1,092	1,167
Total deferred credits and other liabilities	34,094	33,979
Total Liabilities	102,468	100,359
Total Stockholders' Equity	34,648	34,532
Total Liabilities and Stockholders' Equity	137,116	134,891
GEORGIA POWER CO
Current Assets:
Cash and cash equivalents	44	364
Receivables —
Unbilled revenues	348	309
Under recovered fuel clause revenues	695	0
Joint owner accounts	160	128
Other accounts and notes	39	62
Fossil fuel for generation	458	291
Materials and supplies	828	729
Regulatory assets – asset retirement obligations	176	158
Other regulatory assets	354	324
Other current assets	178	246
Total current assets	4,113	3,399
Property, Plant, and Equipment:
In service	42,960	41,879
Less: Accumulated depreciation	13,452	13,115
Plant in service, net of depreciation	29,508	28,764
Nuclear fuel, at amortized cost	622	604
Construction work in progress	8,890	8,103
Total property, plant, and equipment	39,020	37,471
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,093	1,018
Equity investments in unconsolidated subsidiaries	48	51
Miscellaneous property and investments	125	107
Total other property and investments	1,266	1,176
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	943	1,007
Deferred charges related to income taxes	601	583
Prepaid pension costs	805	738
Deferred under recovered fuel clause revenues	1,489	2,056
Regulatory assets – asset retirement obligations, deferred	3,624	3,671
Other regulatory assets, deferred	2,589	2,522
Other deferred charges and assets	551	540
Total deferred charges and other assets	10,602	11,117
Total Assets	55,001	53,163
Current Liabilities:
Securities due within one year	801	901
Notes payable	1,295	1,600
Accounts payable —
Customer deposits	252	252
Accrued taxes	401	508
Accrued interest	173	157
Accrued compensation	151	254
Operating lease obligations	149	151
Asset retirement obligations	320	295
Other regulatory liabilities	25	170
Other current liabilities	393	286
Total current liabilities	5,802	6,578
Long-term Debt	15,934	14,009
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,881	3,707
Deferred credits related to income taxes	2,195	2,244
Accumulated deferred ITCs	314	319
Employee benefit obligations	303	318
Operating lease obligations, deferred	813	851
Asset retirement obligations, deferred	5,779	5,739
Other deferred credits and liabilities	496	540
Total deferred credits and other liabilities	13,781	13,718
Total Liabilities	35,517	34,305
Total Stockholders' Equity	19,484	18,858
Total Liabilities and Stockholders' Equity	55,001	53,163
GEORGIA POWER CO \| Nonrelated Party
Receivables —
Customer and affiliated accounts, net	757	735
Accounts payable —
Affiliated	1,124	1,076
Other	1,124	1,076
GEORGIA POWER CO \| Related Party
Receivables —
Customer and affiliated accounts, net	76	53
Accounts payable —
Affiliated	718	928
Other	$ 718	$ 928

Condensed Statements of Commo_2

Condensed Statements of Common Stockholders' Equity (Unaudited) - GPC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	GEORGIA POWER CO	GEORGIA POWER CO Common Stock	GEORGIA POWER CO Paid-In Capital	GEORGIA POWER CO Retained Earnings (Accumulated Deficit)	GEORGIA POWER CO Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2021							9
Beginning balance at Dec. 31, 2021	$ 32,276	$ 5,279	$ 11,950	$ 10,929	$ (237)	$ 17,234	$ 398	$ 14,153	$ 2,724	$ (41)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						385			385
Capital contributions from parent company						443		443
Other comprehensive income	42				42	10				10
Cash dividends on common stock	(702)			(702)		(423)			(423)
Other	7		7	2
Ending balance (in shares) at Mar. 31, 2022							9
Ending balance at Mar. 31, 2022	32,629	5,286	11,994	11,261	(195)	17,649	$ 398	14,596	2,686	(31)
Beginning balance (in shares) at Dec. 31, 2021							9
Beginning balance at Dec. 31, 2021	32,276	5,279	11,950	10,929	(237)	17,234	$ 398	14,153	2,724	(41)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,079					993
Ending balance (in shares) at Jun. 30, 2022							9
Ending balance at Jun. 30, 2022	33,013	5,288	12,033	11,645	(184)	17,897	$ 398	14,642	2,872	(15)
Beginning balance (in shares) at Mar. 31, 2022							9
Beginning balance at Mar. 31, 2022	32,629	5,286	11,994	11,261	(195)	17,649	$ 398	14,596	2,686	(31)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,089					608			608
Capital contributions from parent company						46		46
Other comprehensive income	11				11	16				16
Cash dividends on common stock	(723)			(723)		(422)			(422)
Other	2		4
Ending balance (in shares) at Jun. 30, 2022							9
Ending balance at Jun. 30, 2022	33,013	5,288	12,033	11,645	(184)	17,897	$ 398	14,642	2,872	(15)
Beginning balance (in shares) at Dec. 31, 2022							9
Beginning balance at Dec. 31, 2022	34,532	5,417	13,673	11,538	(167)	18,858	$ 398	15,626	2,846	(12)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						296			296
Capital contributions from parent company						752		752
Other comprehensive income	(44)				(44)
Cash dividends on common stock	(742)			(742)		(464)			(464)
Other	0		2			1			1
Ending balance (in shares) at Mar. 31, 2023							9
Ending balance at Mar. 31, 2023	34,562	5,421	13,715	11,658	(211)	19,443	$ 398	16,378	2,679	(12)
Beginning balance (in shares) at Dec. 31, 2022							9
Beginning balance at Dec. 31, 2022	34,532	5,417	13,673	11,538	(167)	18,858	$ 398	15,626	2,846	(12)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,622					767
Ending balance (in shares) at Jun. 30, 2023							9
Ending balance at Jun. 30, 2023	34,648	5,422	13,742	11,732	(168)	19,484	$ 398	16,411	2,686	(11)
Beginning balance (in shares) at Mar. 31, 2023							9
Beginning balance at Mar. 31, 2023	34,562	5,421	13,715	11,658	(211)	19,443	$ 398	16,378	2,679	(12)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	823					471			471
Capital contributions from parent company						33		33
Other comprehensive income	43				43	1				1
Cash dividends on common stock	(764)			(764)		(464)			(464)
Other	0		2
Ending balance (in shares) at Jun. 30, 2023							9
Ending balance at Jun. 30, 2023	$ 34,648	$ 5,422	$ 13,742	$ 11,732	$ (168)	$ 19,484	$ 398	$ 16,411	$ 2,686	$ (11)

Condensed Statements of Incom_3

Condensed Statements of Income (Unaudited) - MPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues:
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Operating Expenses:
Other operations and maintenance	1,489	1,548	2,929	3,042
Depreciation and amortization	1,112	913	2,222	1,805
Taxes other than income taxes	340	349	734	721
Total operating expenses	4,458	5,551	9,719	10,815
Operating Income	1,290	1,655	2,509	3,039
Other Income and (Expense):
Interest expense, net of amounts capitalized	(610)	(488)	(1,192)	(950)
Other income (expense), net	142	139	286	283
Total other income and (expense)	(369)	(262)	(693)	(483)
Earnings Before Income Taxes	921	1,393	1,816	2,556
Income taxes (benefit)	98	304	194	477
Net Income	823	1,089	1,622	2,079
Retail electric revenues
Operating Revenues:
Total operating revenues	3,859	4,789	7,458	8,402
Wholesale electric revenues
Operating Revenues:
Total operating revenues	605	937	1,203	1,601
Other electric revenues
Operating Revenues:
Total operating revenues	209	192	399	370
Natural Gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Other revenues
Operating Revenues:
Total operating revenues	223	205	440	341
Operating Expenses:
Total cost of sales	128	114	255	183
Mississippi Power
Operating Revenues:
Total operating revenues	311	434	702	769
Operating Expenses:
Other operations and maintenance	91	91	175	167
Depreciation and amortization	45	45	92	90
Taxes other than income taxes	28	32	60	61
Total operating expenses	260	375	573	657
Operating Income	51	59	129	112
Other Income and (Expense):
Interest expense, net of amounts capitalized	(18)	(14)	(34)	(27)
Other income (expense), net	11	12	20	22
Total other income and (expense)	(7)	(2)	(14)	(5)
Earnings Before Income Taxes	44	57	115	107
Income taxes (benefit)	4	12	17	20
Net Income	40	45	98	87
Mississippi Power \| Retail electric revenues
Operating Revenues:
Total operating revenues	227	252	464	469
Mississippi Power \| Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	56	63	124	131
Mississippi Power \| Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	18	107	93	149
Mississippi Power \| Other revenues
Operating Revenues:
Total operating revenues	10	12	21	20
Mississippi Power \| Fuel and purchased power
Operating Expenses:
Total cost of sales	$ 96	$ 207	$ 246	$ 339

Condensed Statements of Cash _5

Condensed Statements of Cash Flows (Unaudited) - MPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Consolidated net income	$ 1,622	$ 2,079
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,436	1,995
Deferred income taxes	(34)	240
Pension, postretirement, and other employee benefits	(245)	(211)
Settlement of asset retirement obligations	(276)	(198)
Other, net	(50)	34
Changes in certain current assets and liabilities —
Receivables	735	(637)
Other current assets	103	(101)
Accounts payable	(997)	703
Accrued compensation	(378)	(260)
Other current liabilities	101	(120)
Net cash provided from operating activities	2,900	3,579
Investing Activities:
Property additions	(3,898)	(3,213)
Construction payables	(140)	(3)
Other investing activities	(100)	18
Net cash used for investing activities	(4,288)	(3,460)
Financing Activities:
Increase in notes payable, net		263
Payment of common stock dividends	(1,506)	(1,425)
Net cash provided from (used for) financing activities	1,595	(213)
Net Change in Cash, Cash Equivalents, and Restricted Cash	207	(94)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,244	1,735
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,043	836
Income taxes, net	(40)	157
Noncash transactions —
Accrued property additions at end of period	810	837
Right-of-use assets obtained under operating leases	44	13
Mississippi Power
Operating Activities:
Consolidated net income	98	87
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	113	110
Deferred income taxes	(8)	(2)
Pension, postretirement, and other employee benefits	(10)	(8)
Settlement of asset retirement obligations	(7)	(9)
Other, net	4	32
Changes in certain current assets and liabilities —
Receivables	73	(92)
Retail fuel cost under recovery	(23)	(25)
Other current assets	(11)	(23)
Accounts payable	(79)	79
Accrued taxes	(61)	(36)
Accrued compensation	(14)	(9)
Other current liabilities	7	8
Net cash provided from operating activities	82	112
Investing Activities:
Property additions	(164)	(87)
Construction payables	(3)	(16)
Payments pursuant to LTSAs	(15)	(15)
Other investing activities	(11)	(15)
Net cash used for investing activities	(193)	(133)
Financing Activities:
Increase in notes payable, net	53	16
Proceeds — Senior notes	100	0
Capital contributions from parent company	11	51
Payment of common stock dividends	(93)	(85)
Net cash provided from (used for) financing activities	71	(18)
Net Change in Cash, Cash Equivalents, and Restricted Cash	(40)	(39)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	59	61
Cash, Cash Equivalents, and Restricted Cash at End of Period	19	22
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	34	26
Income taxes, net	31	5
Noncash transactions —
Accrued property additions at end of period	22	9
Right-of-use assets obtained under operating leases	$ 1	$ 0

Condensed Balance Sheets (Una_3

Condensed Balance Sheets (Unaudited) - MPC - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 2,123	$ 1,917
Receivables —
Customer and affiliated accounts, net	1,852	2,128
Unbilled revenues	682	1,012
Other accounts and notes	568	637
Fossil fuel for generation	883	575
Materials and supplies	1,846	1,664
Other regulatory assets	930	860
Other current assets	310	344
Total current assets	10,979	10,416
Property, Plant, and Equipment:
In service	119,852	117,529
Less: Accumulated depreciation	36,500	35,297
Plant in service, net of depreciation	83,352	82,232
Construction work in progress	11,992	10,896
Total property, plant, and equipment	96,767	94,570
Other Property and Investments:
Total other property and investments	9,845	9,757
Deferred Charges and Other Assets:
Deferred charges related to income taxes	892	866
Regulatory assets – asset retirement obligations, deferred	5,681	5,764
Other regulatory assets, deferred	5,806	5,918
Other deferred charges and assets	1,469	1,485
Total deferred charges and other assets	19,525	20,148
Total Assets	137,116	134,891
Current Liabilities:
Securities due within one year	4,063	4,285
Notes payable	1,647	2,609
Accounts payable —
Accrued compensation	719	1,127
Asset retirement obligations	715	694
Other regulatory liabilities	268	382
Other current liabilities	870	787
Total current liabilities	13,240	15,724
Long-term Debt	55,134	50,656
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,623	10,036
Deferred credits related to income taxes	4,965	5,235
Employee benefit obligations	1,217	1,238
Asset retirement obligations, deferred	10,127	10,146
Other cost of removal obligations	1,932	1,903
Other regulatory liabilities, deferred	691	733
Other deferred credits and liabilities	1,092	1,167
Total deferred credits and other liabilities	34,094	33,979
Total Liabilities	102,468	100,359
Total Liabilities and Stockholders' Equity	137,116	134,891
Mississippi Power
Current Assets:
Cash and cash equivalents	19	59
Receivables —
Unbilled revenues	47	47
Other accounts and notes	26	35
Fossil fuel for generation	58	44
Materials and supplies	83	80
Other regulatory assets	67	72
Other current assets	12	38
Total current assets	400	504
Property, Plant, and Equipment:
In service	5,417	5,254
Less: Accumulated depreciation	1,729	1,689
Plant in service, net of depreciation	3,688	3,565
Construction work in progress	177	208
Total property, plant, and equipment	3,865	3,773
Other Property and Investments:
Total other property and investments	162	167
Deferred Charges and Other Assets:
Deferred charges related to income taxes	29	30
Prepaid pension costs	118	109
Regulatory assets – asset retirement obligations, deferred	240	239
Other regulatory assets, deferred	258	249
Accumulated deferred income taxes	100	107
Other deferred charges and assets	77	94
Total deferred charges and other assets	822	828
Total Assets	5,249	5,272
Current Liabilities:
Securities due within one year	201	1
Notes payable	53	0
Accounts payable —
Accrued taxes	63	124
Accrued compensation	24	37
Asset retirement obligations	26	37
Other regulatory liabilities	35	43
Other current liabilities	86	85
Total current liabilities	632	554
Long-term Debt	1,444	1,544
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	467	466
Deferred credits related to income taxes	232	253
Employee benefit obligations	68	69
Asset retirement obligations, deferred	149	142
Other cost of removal obligations	197	196
Other regulatory liabilities, deferred	79	96
Other deferred credits and liabilities	33	21
Total deferred credits and other liabilities	1,225	1,243
Total Liabilities	3,301	3,341
Total common stockholders' equity	1,948	1,931
Total Liabilities and Stockholders' Equity	5,249	5,272
Mississippi Power \| Nonrelated Party
Receivables —
Customer and affiliated accounts, net	68	47
Accounts payable —
Affiliated	70	106
Other	70	106
Mississippi Power \| Related Party
Receivables —
Customer and affiliated accounts, net	20	82
Accounts payable —
Affiliated	74	121
Other	$ 74	$ 121

Condensed Statements of Commo_3

Condensed Statements of Common Stockholders' Equity (Unaudited) - MPC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings (Accumulated Deficit)	Mississippi Power	Mississippi Power Common Stock	Mississippi Power Paid-In Capital	Mississippi Power Retained Earnings (Accumulated Deficit)
Beginning balance (in shares) at Dec. 31, 2021						1
Beginning balance at Dec. 31, 2021	$ 32,276	$ 5,279	$ 11,950	$ 10,929	$ 1,867	$ 38	$ 4,582	$ (2,753)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income					42			42
Capital contributions from parent company					51		51
Cash dividends on common stock	(702)			(702)	(43)			(43)
Ending balance (in shares) at Mar. 31, 2022						1
Ending balance at Mar. 31, 2022	32,629	5,286	11,994	11,261	1,917	$ 38	4,633	(2,754)
Beginning balance (in shares) at Dec. 31, 2021						1
Beginning balance at Dec. 31, 2021	32,276	5,279	11,950	10,929	1,867	$ 38	4,582	(2,753)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,139
Ending balance (in shares) at Jun. 30, 2022						1
Ending balance at Jun. 30, 2022	33,013	5,288	12,033	11,645	1,921	$ 38	4,634	(2,751)
Beginning balance (in shares) at Mar. 31, 2022						1
Beginning balance at Mar. 31, 2022	32,629	5,286	11,994	11,261	1,917	$ 38	4,633	(2,754)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,107				45			45
Capital contributions from parent company					1		1
Cash dividends on common stock	(723)			(723)	(42)			(42)
Ending balance (in shares) at Jun. 30, 2022						1
Ending balance at Jun. 30, 2022	33,013	5,288	12,033	11,645	1,921	$ 38	4,634	(2,751)
Beginning balance (in shares) at Dec. 31, 2022						1
Beginning balance at Dec. 31, 2022	34,532	5,417	13,673	11,538	1,931	$ 38	4,652	(2,759)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income					58			58
Cash dividends on common stock	(742)			(742)	(46)			(46)
Ending balance (in shares) at Mar. 31, 2023						1
Ending balance at Mar. 31, 2023	34,562	5,421	13,715	11,658	1,943	$ 38	4,652	(2,747)
Beginning balance (in shares) at Dec. 31, 2022						1
Beginning balance at Dec. 31, 2022	34,532	5,417	13,673	11,538	1,931	$ 38	4,652	(2,759)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,700
Ending balance (in shares) at Jun. 30, 2023						1
Ending balance at Jun. 30, 2023	34,648	5,422	13,742	11,732	1,948	$ 38	4,664	(2,754)
Beginning balance (in shares) at Mar. 31, 2023						1
Beginning balance at Mar. 31, 2023	34,562	5,421	13,715	11,658	1,943	$ 38	4,652	(2,747)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	838				40			40
Capital contributions from parent company					12		12
Cash dividends on common stock	(764)			(764)	(47)			(47)
Ending balance (in shares) at Jun. 30, 2023						1
Ending balance at Jun. 30, 2023	$ 34,648	$ 5,422	$ 13,742	$ 11,732	$ 1,948	$ 38	$ 4,664	$ (2,754)

Condensed Consolidated Statem_9

Condensed Consolidated Statements of Income (Unaudited) - SPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues:
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Operating Expenses:
Other operations and maintenance	1,489	1,548	2,929	3,042
Depreciation and amortization	1,112	913	2,222	1,805
Taxes other than income taxes	340	349	734	721
Total operating expenses	4,458	5,551	9,719	10,815
Operating Income	1,290	1,655	2,509	3,039
Other Income and (Expense):
Interest expense, net of amounts capitalized	(610)	(488)	(1,192)	(950)
Other income (expense), net	142	139	286	283
Total other income and (expense)	(369)	(262)	(693)	(483)
Earnings Before Income Taxes	921	1,393	1,816	2,556
Income taxes (benefit)	98	304	194	477
Net Income	823	1,089	1,622	2,079
Net loss attributable to noncontrolling interests	(15)	(22)	(78)	(67)
Retail electric revenues
Operating Revenues:
Total operating revenues	3,859	4,789	7,458	8,402
Wholesale electric revenues
Operating Revenues:
Total operating revenues	605	937	1,203	1,601
Other electric revenues
Operating Revenues:
Total operating revenues	209	192	399	370
Natural Gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Other revenues
Operating Revenues:
Total operating revenues	223	205	440	341
Operating Expenses:
Total cost of sales	128	114	255	183
Fuel
Operating Expenses:
Total cost of sales	959	1,715	2,009	2,826
Purchased power
Operating Expenses:
Total cost of sales	231	408	473	640
SOUTHERN POWER CO
Operating Revenues:
Total operating revenues	525	899	1,033	1,438
Operating Expenses:
Other operations and maintenance	117	115	224	220
Depreciation and amortization	122	131	250	251
Taxes other than income taxes	12	12	25	25
Gain on dispositions, net	0	0	(20)	(2)
Total operating expenses	418	763	863	1,252
Operating Income	107	136	170	186
Other Income and (Expense):
Interest expense, net of amounts capitalized	(33)	(36)	(66)	(73)
Other income (expense), net	2	1	4	3
Total other income and (expense)	(31)	(35)	(62)	(70)
Earnings Before Income Taxes	76	101	108	116
Income taxes (benefit)	6	25	(1)	13
Net Income	70	76	109	103
Net loss attributable to noncontrolling interests	(15)	(22)	(78)	(67)
Net Income	85	98	187	170
SOUTHERN POWER CO \| Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	393	658	755	1,084
SOUTHERN POWER CO \| Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	116	232	251	337
SOUTHERN POWER CO \| Other revenues
Operating Revenues:
Total operating revenues	16	9	27	17
SOUTHERN POWER CO \| Fuel
Operating Expenses:
Total cost of sales	139	437	330	669
SOUTHERN POWER CO \| Purchased power
Operating Expenses:
Total cost of sales	$ 28	$ 68	$ 54	$ 89

Condensed Consolidated State_10

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - SPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income	$ 823	$ 1,089	$ 1,622	$ 2,079
Qualifying hedges:
Changes in fair value, net of tax	28	(45)	(36)	(26)
Reclassification adjustment for amounts included in net income, net of tax	15	54	34	74
Reclassification adjustment for amounts included in net income, net of tax	0	2	0	5
Total other comprehensive income (loss)	43	11	(2)	53
Comprehensive income	866	1,100	1,620	2,132
Comprehensive loss attributable to noncontrolling interests	(15)	(22)	(78)	(67)
Comprehensive Income	881	1,118	1,698	2,192
SOUTHERN POWER CO
Net income	70	76	109	103
Qualifying hedges:
Changes in fair value, net of tax	5	(54)	(4)	(72)
Reclassification adjustment for amounts included in net income, net of tax	5	57	7	79
Reclassification adjustment for amounts included in net income, net of tax	0	0	0	1
Total other comprehensive income (loss)	10	3	3	8
Comprehensive income	80	79	112	111
Comprehensive loss attributable to noncontrolling interests	(15)	(22)	(78)	(67)
Comprehensive Income	$ 95	$ 101	$ 190	$ 178

Condensed Consolidated State_11

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - SPC (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Changes in fair value, tax	$ 9	$ (15)	$ (14)	$ (7)
Qualifying hedges, reclassification adjustment, tax	6	17	13	24
Reclassification adjustment for amounts included in net income, tax	0	1	0	2
SOUTHERN POWER CO
Changes in fair value, tax	2	(18)	(1)	(23)
Qualifying hedges, reclassification adjustment, tax	2	19	2	26
Reclassification adjustment for amounts included in net income, tax	$ 0	$ 0	$ 0	$ 0

Condensed Consolidated State_12

Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Consolidated net income	$ 1,622	$ 2,079
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,436	1,995
Deferred income taxes	(34)	240
Utilization of federal investment tax credits	110	281
Other, net	(50)	34
Changes in certain current assets and liabilities —
Receivables	735	(637)
Other current assets	103	(101)
Accounts payable	(997)	703
Accrued compensation	(378)	(260)
Other current liabilities	101	(120)
Net cash provided from operating activities	2,900	3,579
Investing Activities:
Property additions	(3,898)	(3,213)
Other investing activities	(100)	18
Net cash used for investing activities	(4,288)	(3,460)
Financing Activities:
Increase (decrease) in notes payable, net	(375)
Increase (decrease) in notes payable, net		263
Capital contributions from noncontrolling interests	21	73
Distributions to noncontrolling interests	(87)	(115)
Payment of common stock dividends	(1,506)	(1,425)
Other financing activities	(121)	(219)
Net cash provided from (used for) financing activities	1,595	(213)
Net Change in Cash, Cash Equivalents, and Restricted Cash	207	(94)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,244	1,735
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,043	836
Income taxes, net	(40)	157
Noncash transactions —
Accrued property additions at end of period	810	837
Reassessment of right-of-use assets under operating leases	0	40
SOUTHERN POWER CO
Operating Activities:
Consolidated net income	109	103
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	260	264
Deferred income taxes	(14)	14
Utilization of federal investment tax credits	99	239
Amortization of investment tax credits	(29)	(29)
Gain on dispositions, net	(20)	(2)
Other, net	(19)	(25)
Changes in certain current assets and liabilities —
Receivables	77	(161)
Prepaid income taxes	9	22
Other current assets	(13)	(6)
Accounts payable	(91)	114
Increase Decrease in Accrued Taxes	8	42
Accrued compensation	(11)	(8)
Other current liabilities	(8)	(15)
Net cash provided from operating activities	357	552
Investing Activities:
Property additions	(25)	(34)
Proceeds from dispositions	59	48
Change in construction payables	(20)	(54)
Payments pursuant to LTSAs	(31)	(33)
Other investing activities	(1)	0
Net cash used for investing activities	(18)	(73)
Financing Activities:
Increase (decrease) in notes payable, net	(124)
Increase (decrease) in notes payable, net		94
Redemptions — Senior notes	0	(677)
Capital contributions from parent company	13	326
Capital contributions from noncontrolling interests	21	73
Distributions to noncontrolling interests	(87)	(115)
Payment of common stock dividends	(126)	(99)
Other financing activities	3	(5)
Net cash provided from (used for) financing activities	(300)	(403)
Net Change in Cash, Cash Equivalents, and Restricted Cash	39	76
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	133	135
Cash, Cash Equivalents, and Restricted Cash at End of Period	172	211
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	74	91
Income taxes, net	(64)	(263)
Noncash transactions —
Accrued property additions at end of period	7	28
Reassessment of right-of-use assets under operating leases	$ 0	$ 40

Condensed Consolidated State_13

Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net cash paid for capitalized interest	$ 66	$ 46

Condensed Consolidated Balanc_3

Condensed Consolidated Balance Sheets (Unaudited) - SPC - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 2,123	$ 1,917
Receivables —
Customer and affiliated accounts, net	1,852	2,128
Other accounts and notes	568	637
Materials and supplies	1,846	1,664
Other current assets	310	344
Total current assets	10,979	10,416
Property, Plant, and Equipment:
In service	119,852	117,529
Less: Accumulated depreciation	36,500	35,297
Plant in service, net of depreciation	83,352	82,232
Construction work in progress	11,992	10,896
Total property, plant, and equipment	96,767	94,570
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	1,382	1,443
Total other property and investments	9,845	9,757
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,481	1,531
Other deferred charges and assets	1,469	1,485
Total deferred charges and other assets	19,525	20,148
Total Assets	137,116	134,891
Current Liabilities:
Securities due within one year	4,063	4,285
Notes payable	1,647	2,609
Accounts payable —
Accrued interest	652	614
Other current liabilities	870	787
Total current liabilities	13,240	15,724
Long-term Debt	55,134	50,656
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,623	10,036
Accumulated deferred ITCs	2,091	2,133
Operating lease obligations, deferred	1,356	1,388
Other deferred credits and liabilities	1,092	1,167
Total deferred credits and other liabilities	34,094	33,979
Total Liabilities	102,468	100,359
Total Stockholders' Equity (See accompanying statements)	34,648	34,532
Total Liabilities and Stockholders' Equity	137,116	134,891
SOUTHERN POWER CO
Current Assets:
Cash and cash equivalents	169	131
Receivables —
Other accounts and notes	67	70
Materials and supplies	82	88
Prepaid income taxes	228	5
Other current assets	54	50
Total current assets	821	621
Property, Plant, and Equipment:
In service	14,675	14,658
Less: Accumulated depreciation	3,875	3,661
Plant in service, net of depreciation	10,800	10,997
Construction work in progress	18	41
Total property, plant, and equipment	10,818	11,038
Other Property and Investments:
Intangible assets, net of amortization	253	263
Equity investments in unconsolidated subsidiaries	0	49
Net investment in sales-type leases	151	154
Total other property and investments	404	466
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	485	489
Prepaid LTSAs	209	193
Other deferred charges and assets	309	274
Total deferred charges and other assets	1,003	956
Total Assets		13,081
Current Liabilities:
Securities due within one year	291	290
Notes payable	100	225
Accounts payable —
Accrued taxes	31	24
Accrued interest	24	28
Other current liabilities	88	111
Total current liabilities	637	884
Long-term Debt	2,699	2,689
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	598	279
Accumulated deferred ITCs	1,527	1,556
Operating lease obligations, deferred	510	514
Other deferred credits and liabilities	228	243
Total deferred credits and other liabilities	2,863	2,592
Total Liabilities	6,199	6,165
Total Stockholders' Equity (See accompanying statements)	6,847	6,916
Total Liabilities and Stockholders' Equity	13,046	13,081
SOUTHERN POWER CO \| Nonrelated Party
Receivables —
Customer and affiliated accounts, net	157	226
Accounts payable —
Affiliated	30	67
Other	30	67
SOUTHERN POWER CO \| Related Party
Receivables —
Customer and affiliated accounts, net	64	51
Accounts payable —
Affiliated	73	139
Other	$ 73	$ 139

Condensed Consolidated Balanc_4

Condensed Consolidated Balance Sheets (Unaudited) - SPC (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Other intangible assets, amortization	$ 358	$ 340
SOUTHERN POWER CO
Other intangible assets, amortization	$ 139	$ 129

Condensed Consolidated State_14

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - SPC - USD ($) $ in Millions	Total	Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	SOUTHERN POWER CO	SOUTHERN POWER CO Total Common Stockholders' Equity	SOUTHERN POWER CO Paid-In Capital	SOUTHERN POWER CO Retained Earnings (Accumulated Deficit)	SOUTHERN POWER CO Accumulated Other Comprehensive Income (Loss)	SOUTHERN POWER CO Noncontrolling Interests
Beginning balance at Dec. 31, 2021	$ 32,276	$ 11,950	$ 10,929	$ (237)	$ 4,402	$ 6,598	$ 2,196	$ 638	$ 1,585	$ (27)	$ 4,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						27	72		72		(45)
Other comprehensive income	42			42		5	5			5
Cash dividends on common stock	(702)		(702)			(49)	(49)		(49)
Capital contributions from noncontrolling interests	73				73	73					73
Distributions to noncontrolling interests	(98)				(98)	(98)					(98)
Other	7	7	2
Ending balance at Mar. 31, 2022	32,629	11,994	11,261	(195)	4,332	6,556	2,224	638	1,608	(22)	4,332
Beginning balance at Dec. 31, 2021	32,276	11,950	10,929	(237)	4,402	6,598	2,196	638	1,585	(27)	4,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,079					103
Ending balance at Jun. 30, 2022	33,013	12,033	11,645	(184)	4,282	6,879	2,597	960	1,656	(19)	4,282
Beginning balance at Mar. 31, 2022	32,629	11,994	11,261	(195)	4,332	6,556	2,224	638	1,608	(22)	4,332
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,089					76	98		98		(22)
Capital contributions from parent company						322	322	322
Other comprehensive income	11			11		3	3			3
Cash dividends on common stock	(723)		(723)			(50)	(50)		(50)
Distributions to noncontrolling interests	(28)				(28)	(28)					(28)
Other	2	4
Ending balance at Jun. 30, 2022	33,013	12,033	11,645	(184)	4,282	6,879	2,597	960	1,656	(19)	4,282
Beginning balance at Dec. 31, 2022	34,532	13,673	11,538	(167)	4,124	6,916	2,792	1,069	1,741	(18)	4,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						39	102		102		(63)
Capital contributions from parent company						14	14	14
Other comprehensive income	(44)			(44)		(7)	(7)			(7)
Cash dividends on common stock	(742)		(742)			(63)	(63)		(63)
Capital contributions from noncontrolling interests	21				21	21					21
Distributions to noncontrolling interests	(48)				(48)	(48)					(48)
Other	0	2
Ending balance at Mar. 31, 2023	34,562	13,715	11,658	(211)	4,034	6,858	2,824	1,069	1,780	(25)	4,034
Beginning balance at Dec. 31, 2022	34,532	13,673	11,538	(167)	4,124	6,916	2,792	1,069	1,741	(18)	4,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,622					109
Ending balance at Jun. 30, 2023	34,648	13,742	11,732	(168)	3,976	6,847	2,871	1,083	1,802	(14)	3,976
Beginning balance at Mar. 31, 2023	34,562	13,715	11,658	(211)	4,034	6,858	2,824	1,069	1,780	(25)	4,034
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	823					70	85		85		(15)
Other comprehensive income	43			43		10	10			10
Cash dividends on common stock	(764)		(764)			(63)	(63)		(63)
Distributions to noncontrolling interests	(42)				(42)	(42)					(42)
Other	0	2			(1)	0	1			1	(1)
Ending balance at Jun. 30, 2023	$ 34,648	$ 13,742	$ 11,732	$ (168)	$ 3,976	$ 6,847	$ 2,871	$ 1,083	$ 1,802	$ (14)	$ 3,976

Condensed Consolidated State_15

Condensed Consolidated Statements of Income (Unaudited) - GAS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues:
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Operating Expenses:
Other operations and maintenance	1,489	1,548	2,929	3,042
Depreciation and amortization	1,112	913	2,222	1,805
Taxes other than income taxes	340	349	734	721
Total operating expenses	4,458	5,551	9,719	10,815
Operating Income	1,290	1,655	2,509	3,039
Other Income and (Expense):
Earnings from equity method investments	29	34	78	80
Interest expense, net of amounts capitalized	(610)	(488)	(1,192)	(950)
Other income (expense), net	142	139	286	283
Total other income and (expense)	(369)	(262)	(693)	(483)
Earnings Before Income Taxes	921	1,393	1,816	2,556
Income taxes (benefit)	98	304	194	477
Net Income	823	1,089	1,622	2,079
Retail electric revenues
Operating Revenues:
Total operating revenues	3,859	4,789	7,458	8,402
Wholesale electric revenues
Operating Revenues:
Total operating revenues	605	937	1,203	1,601
Other electric revenues
Operating Revenues:
Total operating revenues	209	192	399	370
Natural Gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Natural gas
Operating Expenses:
Total cost of sales	199	452	1,097	1,546
Other revenues
Operating Revenues:
Total operating revenues	223	205	440	341
Operating Expenses:
Total cost of sales	128	114	255	183
Fuel
Operating Expenses:
Total cost of sales	959	1,715	2,009	2,826
Purchased power
Operating Expenses:
Total cost of sales	231	408	473	640
SOUTHERN Co GAS
Operating Revenues:
Total operating revenues	$ 852	$ 1,083	$ 2,728	$ 3,140
Operating Expenses:
Cost, Product and Service [Extensible Enumeration]	Natural gas	Natural gas	Natural gas	Natural gas
Other operations and maintenance	$ 309	$ 266	$ 615	$ 570
Depreciation and amortization	143	138	284	275
Taxes other than income taxes	59	62	161	163
Total operating expenses	710	918	2,157	2,554
Operating Income	142	165	571	586
Other Income and (Expense):
Earnings from equity method investments	28	31	72	71
Interest expense, net of amounts capitalized	(73)	(61)	(150)	(122)
Other income (expense), net	17	16	32	32
Total other income and (expense)	(28)	(14)	(46)	(19)
Earnings Before Income Taxes	114	151	525	567
Income taxes (benefit)	29	36	132	134
Net Income	85	115	393	433
SOUTHERN Co GAS \| Natural gas
Operating Revenues:
Total operating revenues	852	1,083	2,728	3,140
Operating Expenses:
Total cost of sales	$ 199	$ 452	$ 1,097	$ 1,546

Condensed Consolidated State_16

Condensed Consolidated Statements of Income (Unaudited) - GAS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
SOUTHERN Co GAS
Revenue taxes collected	$ 25	$ 33	$ 91	$ 104

Condensed Consolidated State_17

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - GAS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net income	$ 823	$ 1,089	$ 1,622	$ 2,079
Qualifying hedges:
Changes in fair value, net of tax	28	(45)	(36)	(26)
Reclassification adjustment for amounts included in net income, net of tax	15	54	34	74
Total other comprehensive income (loss)	43	11	(2)	53
Comprehensive Income	866	1,100	1,620	2,132
SOUTHERN Co GAS
Net income	85	115	393	433
Qualifying hedges:
Changes in fair value, net of tax	0	(5)	(24)	22
Reclassification adjustment for amounts included in net income, net of tax	7	(7)	21	(13)
Total other comprehensive income (loss)	7	(12)	(3)	9
Comprehensive Income	$ 92	$ 103	$ 390	$ 442

Condensed Consolidated State_18

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - GAS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Changes in fair value, tax	$ 9	$ (15)	$ (14)	$ (7)
Qualifying hedges, reclassification adjustment, tax	6	17	13	24
SOUTHERN Co GAS
Changes in fair value, tax	0	(2)	(9)	8
Qualifying hedges, reclassification adjustment, tax	$ 3	$ (3)	$ 9	$ (5)

Condensed Consolidated State_19

Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Consolidated net income	$ 1,622	$ 2,079
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	2,436	1,995
Deferred income taxes	(34)	240
Natural gas cost under recovery – long-term	0	192
Other, net	(50)	34
Changes in certain current assets and liabilities —
Receivables	735	(637)
Natural gas for sale, net of temporary LIFO liquidation	196	335
Other current assets	103	(101)
Accounts payable	(997)	703
Other current liabilities	101	(120)
Net cash provided from operating activities	2,900	3,579
Investing Activities:
Property additions	(3,898)	(3,213)
Cost of removal, net of salvage	(270)	(377)
Construction payables	(140)	(3)
Other investing activities	(100)	18
Net cash used for investing activities	(4,288)	(3,460)
Financing Activities:
Decrease in notes payable, net	(375)
Short-term borrowings	250	1,200
Redemptions —
Short-term borrowings	(850)	(400)
Payment of common stock dividends	(1,506)	(1,425)
Net cash provided from (used for) financing activities	1,595	(213)
Net Change in Cash, Cash Equivalents, and Restricted Cash	207	(94)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2,037	1,829
Cash, Cash Equivalents, and Restricted Cash at End of Period	2,244	1,735
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	1,043	836
Income taxes, net	(40)	157
Accrued property additions at end of period	810	837
Right-of-use assets obtained under operating leases	44	13
SOUTHERN Co GAS
Operating Activities:
Consolidated net income	393	433
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	284	275
Deferred income taxes	52	35
Natural gas cost under recovery – long-term	0	192
Other, net	12	55
Changes in certain current assets and liabilities —
Receivables	667	244
Natural gas for sale, net of temporary LIFO liquidation	196	335
Prepaid income taxes	(3)	(70)
Other current assets	79	(75)
Accounts payable	(276)	101
Natural gas cost over recovery	161	0
Other current liabilities	(35)	(47)
Net cash provided from operating activities	1,530	1,478
Investing Activities:
Property additions	(741)	(637)
Cost of removal, net of salvage	(50)	(53)
Construction payables	11	13
Other investing activities	19	19
Net cash used for investing activities	(761)	(658)
Financing Activities:
Decrease in notes payable, net	(372)	(593)
Short-term borrowings	0	50
Other long-term debt	19	0
Redemptions —
Short-term borrowings	(200)	(150)
Medium-term notes	0	(46)
Capital contributions from parent company	238	349
Payment of common stock dividends	(293)	(260)
Net cash provided from (used for) financing activities	(608)	(650)
Net Change in Cash, Cash Equivalents, and Restricted Cash	161	170
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	83	48
Cash, Cash Equivalents, and Restricted Cash at End of Period	244	218
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	145	129
Income taxes, net	85	210
Accrued property additions at end of period	189	126
Right-of-use assets obtained under operating leases	2	0
ALABAMA POWER CO
Operating Activities:
Consolidated net income	568	737
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	770	494
Deferred income taxes	(142)	117
Other, net	(60)	(67)
Changes in certain current assets and liabilities —
Receivables	16	(296)
Other current assets	(112)	(31)
Accounts payable	(363)	14
Other current liabilities	21	24
Net cash provided from operating activities	656	510
Investing Activities:
Property additions	(865)	(759)
Cost of removal, net of salvage	(83)	(104)
Construction payables	(79)	(8)
Other investing activities	16	(18)
Net cash used for investing activities	(1,011)	(889)
Financing Activities:
Other long-term debt	17	0
Redemptions —
Capital contributions from parent company	352	656
Payment of common stock dividends	(571)	(508)
Net cash provided from (used for) financing activities	(11)	227
Net Change in Cash, Cash Equivalents, and Restricted Cash	(366)	(152)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	687	1,060
Cash, Cash Equivalents, and Restricted Cash at End of Period	321	908
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	192	166
Income taxes, net	52	192
Accrued property additions at end of period	$ 103	$ 141

Condensed Consolidated State_20

Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net cash paid for capitalized interest	$ 66	$ 46
SOUTHERN Co GAS
Net cash paid for capitalized interest	$ 8	$ 4

Condensed Consolidated Balanc_5

Condensed Consolidated Balance Sheets (Unaudited) - GAS - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 2,123	$ 1,917
Receivables —
Customer and affiliated accounts, net	1,852	2,128
Unbilled revenues	682	1,012
Other accounts and notes	568	637
Accumulated provision for uncollectible accounts	(84)	(71)
Natural gas for sale	234	438
Prepaid expenses	504	347
Natural gas cost under recovery	0	108
Other regulatory assets	930	860
Other current assets	310	344
Total current assets	10,979	10,416
Property, Plant, and Equipment:
In service	119,852	117,529
Less: Accumulated depreciation	36,500	35,297
Plant in service, net of depreciation	83,352	82,232
Construction work in progress	11,992	10,896
Total property, plant, and equipment	96,767	94,570
Other Property and Investments:
Goodwill	5,161	5,161
Equity investments in unconsolidated subsidiaries	1,382	1,443
Other intangible assets, net of amortization	386	406
Miscellaneous property and investments	618	602
Total other property and investments	9,845	9,757
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,481	1,531
Prepaid pension costs	2,478	2,290
Other regulatory assets, deferred	5,806	5,918
Other deferred charges and assets	1,469	1,485
Total deferred charges and other assets	19,525	20,148
Total Assets	137,116	134,891
Current Liabilities:
Securities due within one year	4,063	4,285
Notes payable	1,647	2,609
Accounts payable —
Customer deposits	493	502
Accrued interest	652	614
Accrued compensation	719	1,127
Natural gas cost over recovery	161	0
Other regulatory liabilities	268	382
Other current liabilities	870	787
Total current liabilities	13,240	15,724
Long-term Debt	55,134	50,656
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	10,623	10,036
Deferred credits related to income taxes	4,965	5,235
Employee benefit obligations	1,217	1,238
Operating lease obligations, deferred	1,356	1,388
Other cost of removal obligations	1,932	1,903
Other deferred credits and liabilities	1,092	1,167
Total deferred credits and other liabilities	34,094	33,979
Total Liabilities	102,468	100,359
Total Stockholders' Equity	34,648	34,532
Total Liabilities and Stockholders' Equity	137,116	134,891
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	242	81
Receivables —
Customer and affiliated accounts, net	319	616
Unbilled revenues	86	453
Other accounts and notes	77	76
Accumulated provision for uncollectible accounts	(62)	(50)
Natural gas for sale	234	438
Prepaid expenses	115	93
Natural gas cost under recovery	0	108
Other regulatory assets	127	119
Other current assets	119	104
Total current assets	1,257	2,038
Property, Plant, and Equipment:
In service	20,113	19,723
Less: Accumulated depreciation	5,411	5,276
Plant in service, net of depreciation	14,702	14,447
Construction work in progress	1,179	909
Total property, plant, and equipment	15,881	15,356
Other Property and Investments:
Goodwill	5,015	5,015
Equity investments in unconsolidated subsidiaries	1,252	1,276
Other intangible assets, net of amortization	21	26
Miscellaneous property and investments	25	28
Total other property and investments	6,313	6,345
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	55	57
Prepaid pension costs	197	183
Other regulatory assets, deferred	477	497
Other deferred charges and assets	151	145
Total deferred charges and other assets	880	882
Total Assets	24,331	24,621
Current Liabilities:
Securities due within one year	401	400
Notes payable	196	768
Accounts payable —
Customer deposits	115	125
Accrued taxes	63	77
Accrued interest	68	67
Accrued compensation	70	105
Natural gas cost over recovery	161	0
Other regulatory liabilities	85	36
Other current liabilities	176	187
Total current liabilities	1,883	2,570
Long-term Debt	7,050	7,042
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,611	1,560
Deferred credits related to income taxes	774	788
Employee benefit obligations	109	120
Operating lease obligations, deferred	48	51
Other cost of removal obligations	1,735	1,707
Accrued environmental remediation	190	207
Other deferred credits and liabilities	193	179
Total deferred credits and other liabilities	4,660	4,612
Total Liabilities	13,593	14,224
Total Stockholders' Equity	10,738	10,397
Total Liabilities and Stockholders' Equity	24,331	24,621
SOUTHERN Co GAS \| Related Party
Accounts payable —
Affiliated	125	104
Other	125	104
SOUTHERN Co GAS \| Nonrelated Party
Accounts payable —
Affiliated	423	701
Other	$ 423	$ 701

Condensed Consolidated Balanc_6

Condensed Consolidated Balance Sheets (Unaudited) - GAS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Other intangible assets, amortization	$ 358	$ 340
SOUTHERN Co GAS
Other intangible assets, amortization	$ 161	$ 156

Condensed Consolidated State_21

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - GAS - USD ($) $ in Millions	Total	Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	SOUTHERN Co GAS	SOUTHERN Co GAS Paid-In Capital	SOUTHERN Co GAS Retained Earnings (Accumulated Deficit)	SOUTHERN Co GAS Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2021	$ 32,276	$ 11,950	$ 10,929	$ (237)	$ 9,916	$ 10,024	$ (132)	$ 24
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income					319		319
Capital contributions from parent company					50	50
Other comprehensive income	42			42	20			20
Cash dividends on common stock	(702)		(702)		(130)		(130)
Other	7	7	2
Ending balance at Mar. 31, 2022	32,629	11,994	11,261	(195)	10,175	10,074	57	44
Beginning balance at Dec. 31, 2021	32,276	11,950	10,929	(237)	9,916	10,024	(132)	24
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,079				433
Ending balance at Jun. 30, 2022	33,013	12,033	11,645	(184)	10,460	10,386	42	32
Beginning balance at Mar. 31, 2022	32,629	11,994	11,261	(195)	10,175	10,074	57	44
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,089				115		115
Capital contributions from parent company					312	312
Other comprehensive income	11			11	(12)			(12)
Cash dividends on common stock	(723)		(723)		(130)		(130)
Other	2	4
Ending balance at Jun. 30, 2022	33,013	12,033	11,645	(184)	10,460	10,386	42	32
Beginning balance at Dec. 31, 2022	34,532	13,673	11,538	(167)	10,397	10,445	(79)	31
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income					309		309
Capital contributions from parent company					203	203
Other comprehensive income	(44)			(44)	(10)			(10)
Cash dividends on common stock	(742)		(742)		(146)		(146)
Other	0	2			0	1	(1)
Ending balance at Mar. 31, 2023	34,562	13,715	11,658	(211)	10,753	10,649	83	21
Beginning balance at Dec. 31, 2022	34,532	13,673	11,538	(167)	10,397	10,445	(79)	31
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,622				393
Ending balance at Jun. 30, 2023	34,648	13,742	11,732	(168)	10,738	10,689	21	28
Beginning balance at Mar. 31, 2023	34,562	13,715	11,658	(211)	10,753	10,649	83	21
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	823				85		85
Capital contributions from parent company					40	40
Other comprehensive income	43			43	7			7
Cash dividends on common stock	(764)		(764)		(147)		(147)
Other	0	2
Ending balance at Jun. 30, 2023	$ 34,648	$ 13,742	$ 11,732	$ (168)	$ 10,738	$ 10,689	$ 21	$ 28

Introduction

Introduction	6 Months Ended
Introduction	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Introduction	INTRODUCTION The condensed quarterly financial statements of each Registrant included herein have been prepared by such Registrant, without audit, pursuant to the rules and regulations of the SEC. The Condensed Balance Sheets at December 31, 2022 have been derived from the audited financial statements of each Registrant. In the opinion of each Registrant's management, the information regarding such Registrant furnished herein reflects all adjustments, which, except as otherwise disclosed, are of a normal recurring nature, necessary to present fairly the results of operations for the periods ended June 30, 2023 and 2022. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations, although each Registrant believes that the disclosures regarding such Registrant are adequate to make the information presented not misleading. Disclosures which would substantially duplicate the disclosures in the Form 10-K and details which have not changed significantly in amount or composition since the filing of the Form 10-K are generally omitted from this Quarterly Report on Form 10-Q unless specifically required by GAAP. Therefore, these Condensed Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the Form 10-K. Due to the seasonal variations in the demand for energy and other factors, operating results for the periods presented are not necessarily indicative of the operating results to be expected for the full year. Certain prior year data presented in the financial statements have been reclassified to conform to the current year presentation. These reclassifications had no impact on the overall results of operations, financial position, or cash flows of any Registrant. Goodwill and Other Intangible Assets Goodwill at June 30, 2023 and December 31, 2022 was as follows: Goodwill (in millions) Southern Company $ 5,161 Southern Company Gas: Gas distribution operations $ 4,034 Gas marketing services 981 Southern Company Gas total $ 5,015 Goodwill is not amortized, but is subject to an annual impairment test during the fourth quarter of each year, or more frequently if goodwill impairment indicators arise. Other intangible assets were as follows: At June 30, 2023 At December 31, 2022 Gross Carrying Amount Accumulated Amortization Other Gross Carrying Amount Accumulated Amortization Other (in millions) (in millions) Southern Company Subject to amortization: Customer relationships $ 212 $ (167) $ 45 $ 212 $ (162) $ 50 Trade names 64 (49) 15 64 (44) 20 PPA fair value adjustments 390 (139) 251 390 (129) 261 Other 3 (3) — 5 (5) — Total subject to amortization $ 669 $ (358) $ 311 $ 671 $ (340) $ 331 Not subject to amortization: FCC licenses 75 — 75 75 — 75 Total other intangible assets $ 744 $ (358) $ 386 $ 746 $ (340) $ 406 Southern Power () PPA fair value adjustments $ 390 $ (139) $ 251 $ 390 $ (129) $ 261 Southern Company Gas () Gas marketing services Customer relationships $ 156 $ (142) $ 14 $ 156 $ (139) $ 17 Trade names 26 (19) 7 26 (17) 9 Total other intangible assets $ 182 $ (161) $ 21 $ 182 $ (156) $ 26 (*) All subject to amortization. Amortization associated with other intangible assets was as follows: Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30, 2023 June 30, 2022 (in millions) Southern Company (a) $ 9 $ 18 $ 9 $ 19 Southern Power (b) 5 10 5 10 Southern Company Gas 2 5 2 5 (a) Includes $5 million, $10 million, $5 million, and $10 million for the three and six months ended June 30, 2023 and 2022, respectively, recorded as a reduction to operating revenues. (b) Recorded as a reduction to operating revenues. Cash, Cash Equivalents, and Restricted Cash The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed balance sheets that total to the amount shown in the condensed statements of cash flows for the applicable Registrants: Southern Company Georgia Power Southern Power Southern (in millions) At June 30, 2023 Cash and cash equivalents $ 2,123 $ 44 $ 169 $ 242 Restricted cash (a) : Other current assets 83 80 — 3 Other deferred charges and assets 39 36 3 — Total cash, cash equivalents, and restricted cash (b) $ 2,244 $ 160 $ 172 $ 244 At December 31, 2022 Cash and cash equivalents $ 1,917 $ 364 $ 131 $ 81 Restricted cash (a) : Other current assets 62 60 — 2 Other deferred charges and assets 58 56 3 — Total cash, cash equivalents, and restricted cash (b) $ 2,037 $ 480 $ 133 $ 83 (a) For Georgia Power, reflects $116 million at both June 30, 2023 and December 31, 2022 related to proceeds from the issuance of solid waste disposal facility revenue bonds in 2022. For Southern Power, reflects $3 million at both June 30, 2023 and December 31, 2022 held to fund estimated construction completion costs at the Deuel Harvest wind facility. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance. (b) Total may not add due to rounding. Natural Gas for Sale With the exception of Nicor Gas, Southern Company Gas records natural gas inventories on a WACOG basis. For any declines in market prices below the WACOG considered to be other than temporary, an adjustment is recorded to reduce the value of natural gas inventories to market value. Nicor Gas' natural gas inventory is carried at cost on a LIFO basis. Inventory decrements occurring during the year that are restored prior to year-end are charged to cost of natural gas at the estimated annual replacement cost. Inventory decrements that are not restored prior to year-end are charged to cost of natural gas at the actual LIFO cost of the inventory layers liquidated. Southern Company Gas recorded no material adjustments to natural gas inventories for either period presented. Nicor Gas' inventory decrement at June 30, 2023 is expected to be restored prior to year-end. Storm Damage Reserves See Note 1 to the financial statements in Item 8 of the Form 10-K under "Storm Damage and Reliability Reserves" for additional information. Storm damage reserve activity for the traditional electric operating companies during the six months ended June 30, 2023 was as follows: Southern Alabama Power Georgia Power Mississippi (in millions) Balance at December 31, 2022 $ 216 $ 97 $ 83 $ 36 Accrual 28 6 16 6 Weather-related damages (85) (24) (58) (3) Balance at June 30, 2023 $ 159 $ 79 $ 41 $ 39 Asset Retirement Obligations See Note 6 to the financial statements in Item 8 of the Form 10-K for additional information. Following initial criticality on March 6, 2023, Georgia Power recorded AROs of approximately $90 million related to Plant Vogtle Unit 3. See Note (B) under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4. In June 2023, Alabama Power completed an updated decommissioning cost site study for Plant Farley. The estimated cost of decommissioning based on the study resulted in a decrease in Alabama Power's ARO liability of approximately $15 million. See "Nuclear Decommissioning" herein for additional information. Nuclear Decommissioning See Note 6 to the financial statements in Item 8 of the Form 10-K under "Nuclear Decommissioning" for additional information. Site study cost is the estimate to decommission a specific facility as of the site study year. The decommissioning cost estimates are based on prompt dismantlement and removal of the plant from service. The actual decommissioning costs may vary from these estimates because of changes in the assumed date of decommissioning, changes in NRC requirements, or changes in the assumptions used in making these estimates. The estimated costs of decommissioning Plant Farley based on Alabama Power's June 2023 site study are as follows: Plant Farley Decommissioning periods: Beginning year 2037 Completion year 2087 (in millions) Site study costs: Radiated structures $ 1,402 Spent fuel management 513 Non-radiated structures 133 Total site study costs $ 2,048 For ratemaking purposes, Alabama Power's decommissioning costs are based on the site study. Significant assumptions used to determine these costs for ratemaking were an estimated inflation rate of 4.5% and an estimated trust earnings rate of 7.0%.

Regulatory Matters

Regulatory Matters	6 Months Ended
Regulatory Matters	Jun. 30, 2023
Regulated Operations [Abstract]
Regulatory Matters	REGULATORY MATTERS See Note 2 to the financial statements in Item 8 of the Form 10-K for additional information relating to regulatory matters. The recovery balances for certain retail regulatory clauses of the traditional electric operating companies and Southern Company Gas at June 30, 2023 and December 31, 2022 were as follows: Regulatory Clause Balance Sheet Line Item June 30, December 31, 2022 (in millions) Alabama Power Rate CNP Compliance Other regulatory assets, current $ 20 $ 47 Other regulatory assets, deferred 40 — Rate CNP PPA Other regulatory assets, current 17 18 Other regulatory assets, deferred 95 102 Retail Energy Cost Recovery Other regulatory assets, current 146 102 Other regulatory assets, deferred 283 520 Georgia Power Fuel Cost Recovery () Receivables – under recovered fuel clause revenues $ 695 $ — Deferred under recovered fuel clause revenues 1,489 2,056 Mississippi Power Fuel Cost Recovery Receivables – customer accounts, net $ 24 $ 1 Ad Valorem Tax Other regulatory assets, current 6 12 Other regulatory assets, deferred 16 19 Southern Company Gas Natural Gas Cost Recovery Natural gas cost under recovery $ — $ 108 Natural gas cost over recovery 161 — () See "Georgia Power – Fuel Cost Recovery" herein for additional information. Alabama Power Certificates of Convenience and Necessity In 2020, the Alabama PSC approved a certificate of convenience and necessity authorizing Alabama Power's construction of Plant Barry Unit 8 and the recovery of estimated in-service costs of $652 million. At June 30, 2023, project expenditures associated with Plant Barry Unit 8 totaled approximately $568 million, of which $563 million and $5 million was included in CWIP and property, plant, and equipment in service, respectively. The unit is expected to be placed in service in November 2023. The ultimate outcome of this matter cannot be determined at this time. Rate CNP New Plant On March 24, 2023, Alabama Power filed Rate CNP New Plant with the Alabama PSC to recover costs associated with the acquisition of the Central Alabama Generating Station. The filing reflected an annual increase in retail revenues of $78 million effective with June 2023 billings. Through May 2023, Alabama Power recovered substantially all costs associated with the Central Alabama Generating Station through Rate RSE, offset by revenues from a power sales agreement. On May 24, 2023, the Central Alabama Generating Station was placed into retail service. See Note 15 to the financial statements under "Alabama Power" in Item 8 of the Form 10-K for additional information. Renewable Generation Certificate Through the issuance of a Renewable Generation Certificate (RGC), Alabama Power is authorized by the Alabama PSC to procure renewable capacity and energy and to market the related energy and environmental attributes to customers and other third parties. On April 4, 2023, the Alabama PSC approved two new solar PPAs totaling 160 MWs. Upon approval of these PPAs, Alabama Power had procured solar capacity totaling approximately 490 MWs under the RGC's original 500-MW limit. On June 14, 2023, the Alabama PSC issued an order approving modifications to Alabama Power's RGC. The modifications authorized Alabama Power to procure an additional 2,400 MWs of renewable capacity and energy by June 14, 2029 and to market the related energy and environmental attributes to customers and other third parties. The modifications also increased the size of allowable renewable projects from 80 MWs to 200 MWs and increased the annual approval limit from 160 MWs to 400 MWs. Reliability Reserve Accounting Order On July 11, 2023, the Alabama PSC issued an order authorizing Alabama Power to expand the existing authority of its reliability reserve to include certain production-related expenses that are intended to maintain reliability in between scheduled generating unit maintenance outages. Georgia Power Plant Vogtle Unit 3 and Common Facilities Rate Proceeding In compliance with a Georgia PSC order approved in November 2021, Georgia Power increased annual retail base rates by $318 million effective August 1, 2023 based on the actual in-service date of July 31, 2023 for Plant Vogtle Unit 3. See "Nuclear Construction" herein for additional information on Plant Vogtle Units 3 and 4. Fuel Cost Recovery On May 16, 2023, the Georgia PSC approved a stipulation agreement between Georgia Power and the staff of the Georgia PSC to increase annual fuel billings by 54%, or approximately $1.1 billion, effective June 1, 2023. The increase includes a three-year recovery period for $2.2 billion of Georgia Power's under recovered fuel balance at May 31, 2023. Under the approved stipulation agreement, Georgia Power is allowed to adjust its fuel cost recovery rates under an interim fuel rider prior to the next fuel case, subject to a maximum 40% cumulative change, if its under or over recovered fuel balance accumulated since May 31, 2023 exceeds $200 million. Georgia Power is scheduled to file its next fuel case no later than February 28, 2026. Changes in fuel rates have no significant effect on Georgia Power's net income but do impact the related operating cash flows. Integrated Resource Plans In August 2022, Restore Chattooga Gorge Coalition (RCG) filed a petition in the Superior Court of Fulton County, Georgia against Georgia Power and the Georgia PSC. The petition challenges Georgia Power's plan to expend $115 million to modernize Plant Tugalo (a hydro facility), as approved in the 2019 IRP, and seeks judicial review of the Georgia PSC's order in the 2022 IRP proceeding with respect to the denial of RCG's challenge to the Nuclear Construction In 2009, the Georgia PSC certified construction of Plant Vogtle Units 3 and 4, in which Georgia Power currently holds a 45.7% ownership interest. In 2012, the NRC issued the related combined construction and operating licenses, which allowed full construction of the two AP1000 nuclear units (with electric generating capacity of approximately 1,100 MWs each) and related facilities to begin. Until March 2017, construction on Plant Vogtle Units 3 and 4 continued under the Vogtle 3 and 4 Agreement, which was a substantially fixed price agreement. In connection with the EPC Contractor's bankruptcy filing in March 2017, Georgia Power, acting for itself and as agent for the other Vogtle Owners, entered into several transitional arrangements to allow construction to continue. In July 2017, Georgia Power, acting for itself and as agent for the other Vogtle Owners, entered into the Vogtle Services Agreement, whereby Westinghouse provides facility design and engineering services, procurement and technical support, and staff augmentation on a time and materials cost basis. The Vogtle Services Agreement provides that it will continue until the start-up and testing of Plant Vogtle Units 3 and 4 are complete and electricity is generated and sold from both units. The Vogtle Services Agreement is terminable by the Vogtle Owners upon 30 days' written notice. In October 2017, Georgia Power, acting for itself and as agent for the other Vogtle Owners, executed the Bechtel Agreement, under which Bechtel is reimbursed for actual costs plus a base fee and an at-risk fee, subject to adjustment based on Bechtel's performance against cost and schedule targets. Each Vogtle Owner is severally (not jointly) liable for its proportionate share, based on its ownership interest, of all amounts owed to Bechtel under the Bechtel Agreement. The Vogtle Owners may terminate the Bechtel Agreement at any time for their convenience, provided that the Vogtle Owners will be required to pay amounts related to work performed prior to the termination (including the applicable portion of the base fee), certain termination-related costs, and, at certain stages of the work, the applicable portion of the at-risk fee. Bechtel may terminate the Bechtel Agreement under certain circumstances, including certain Vogtle Owner suspensions of work, certain breaches of the Bechtel Agreement by the Vogtle Owners, Vogtle Owner insolvency, and certain other events. See Note 8 to the financial statements under "Long-term Debt – DOE Loan Guarantee Borrowings" in Item 8 of the Form 10-K for information on the Amended and Restated Loan Guarantee Agreement, including applicable covenants, events of default, and mandatory prepayment events. Cost and Schedule Georgia Power's approximate proportionate share of the remaining estimated capital cost to complete Plant Vogtle Units 3 and 4, including contingency, through July 2023 and March 2024, respectively, is as follows: (in millions) Base project capital cost forecast (a)(b) $ 10,576 Construction contingency estimate 17 Total project capital cost forecast (a)(b) 10,593 Net investment at June 30, 2023 (b) (9,944) Remaining estimate to complete $ 649 (a) Includes approximately $610 million of costs that are not shared with the other Vogtle Owners, including $33 million of construction monitoring costs approved for recovery by the Georgia PSC in its nineteenth VCM order, and approximately $407 million of incremental costs under the cost-sharing and tender provisions of the joint ownership agreements described below. Excludes financing costs expected to be capitalized through AFUDC of approximately $422 million, of which $365 million had been accrued through June 30, 2023. (b) Net of $1.7 billion received from Toshiba under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds. Georgia Power estimates that its financing costs for construction of Plant Vogtle Units 3 and 4 will total approximately $3.5 billion, of which $3.4 billion had been incurred through June 30, 2023. On March 6, 2023, Unit 3 achieved self-sustaining nuclear fission, commonly referred to as initial criticality, and, on April 1, 2023, the generator successfully synchronized to the power grid and generated electricity for the first time. Georgia Power placed Unit 3 in service on July 31, 2023. See "Plant Vogtle Unit 3 and Common Facilities Rate Proceeding" herein for additional information. As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts for Unit 4 on a regular basis to incorporate current information available, particularly in the areas of start-up testing and related test results, engineering support, commodity installations, system turnovers, and workforce statistics. Southern Nuclear establishes aggressive target values for monthly construction production and system turnover activities, which are reflected in the site work plan for Unit 4. Since March 2020, the number of active COVID-19 cases at the site has fluctuated consistent with the surrounding area and impacted productivity levels and pace of activity completion, with the site experiencing peaks in the number of active cases in January 2021, August 2021, and January 2022. Georgia Power estimates the productivity impacts of the COVID-19 pandemic have consumed approximately three During the first half of 2023, established construction contingency totaling $43 million was assigned to the base capital cost forecast for costs primarily associated with the Unit 3 schedule extension, including continued need of support resources for Unit 3 testing, as well as additional craft and support resources and subcontract work for Unit 4. Hot functional testing for Unit 4 was completed on May 1, 2023. On July 20, 2023, Southern Nuclear announced that all Unit 4 ITAACs had been submitted to the NRC, and, on July 28, 2023, the NRC published its 103(g) finding that the accepted criteria in the combined license for Unit 4 had been met, which allows nuclear fuel to be loaded and start-up testing to begin. Fuel load for Unit 4 is projected to be completed by the end of October 2023. Unit 4 is projected to be placed in service during late fourth quarter 2023 or the first quarter 2024. The projected schedule for Unit 4 significantly depends on maintaining overall construction productivity and production levels, particularly in completing remaining subcontractor scopes of work while reducing the level of craft laborers based on work remaining. As Unit 4 completes construction and transitions further into testing, ongoing and potential future challenges include the pace and quality of remaining commodity installations, the management of contractors and vendors, subcontractor performance, the availability of materials and parts, and/or related cost escalation; the pace of remaining work package closures; the availability of craft, supervisory, and technical support resources; and the timeframe and duration of final component and pre-operational testing. New challenges also may continue to arise as Unit 4 moves further into testing and start-up, which may result in required engineering changes or remediation related to plant systems, structures, or components (some of which are based on new technology that only within the last few years began initial operation in the global nuclear industry at this scale). These challenges may result in further schedule delays and/or cost increases. There have been technical and procedural challenges to the construction and licensing of Plant Vogtle Units 3 and 4 at the federal and state level and additional challenges may arise. Processes are in place that are designed to ensure compliance with the requirements specified in the Westinghouse Design Control Document and the combined construction and operating licenses, including inspections by Southern Nuclear and the NRC that occur throughout construction. With the receipt of the NRC's 103(g) findings for Units 3 and 4 in August 2022 and July 2023, respectively, the site is subject to the NRC's operating reactor oversight process and must meet applicable technical and operational requirements contained in its operating license. Various design and other licensing-based compliance matters may result in additional license amendment requests or require other resolution. If any license amendment requests or other licensing-based compliance issues are not resolved in a timely manner, there may be delays in the Unit 4 project schedule that could result in increased costs. The ultimate outcome of these matters cannot be determined at this time. However, any extension of the in-service date beyond March 2024 for Unit 4, including the joint owner cost sharing and tender impacts described below, is estimated to result in additional base capital costs for Georgia Power of up to $45 million per month, as well as the related AFUDC and any additional related construction, support resources, or testing costs. While Georgia Power is not precluded from seeking retail recovery of any future capital cost forecast increase other than the amounts related to the cost-sharing and tender provisions of the joint ownership agreements described below, management will ultimately determine whether or not to seek recovery. Any further changes to the capital cost forecast that are not expected to be recoverable through regulated rates will be required to be charged to income and such charges could be material. Joint Owner Contracts In November 2017, the Vogtle Owners entered into an amendment to their joint ownership agreements for Plant Vogtle Units 3 and 4 to provide for, among other conditions, additional Vogtle Owner approval requirements. Effective in August 2018, the Vogtle Owners further amended the joint ownership agreements to clarify and provide procedures for certain provisions of the joint ownership agreements related to adverse events that require the vote of the holders of at least 90% of the ownership interests in Plant Vogtle Units 3 and 4 to continue construction (as amended, and together with the November 2017 amendment, the Vogtle Joint Ownership Agreements). The Vogtle Joint Ownership Agreements also confirm that the Vogtle Owners' sole recourse against Georgia Power or Southern Nuclear for any action or inaction in connection with their performance as agent for the Vogtle Owners is limited to removal of Georgia Power and/or Southern Nuclear as agent, except in cases of willful misconduct. Amendments to the Vogtle Joint Ownership Agreements In connection with a September 2018 vote by the Vogtle Owners to continue construction, Georgia Power entered into (i) a binding term sheet (Vogtle Owner Term Sheet) with the other Vogtle Owners and MEAG Power's wholly-owned subsidiaries MEAG Power SPVJ, LLC (MEAG SPVJ), MEAG Power SPVM, LLC (MEAG SPVM), and MEAG Power SPVP, LLC (MEAG SPVP) to take certain actions which partially mitigate potential financial exposure for the other Vogtle Owners, including additional amendments to the Vogtle Joint Ownership Agreements and the purchase of PTCs from the other Vogtle Owners at pre-established prices, and (ii) a term sheet (MEAG Term Sheet) with MEAG Power and MEAG SPVJ to provide up to $300 million of funding with respect to MEAG SPVJ's ownership interest in Plant Vogtle Units 3 and 4 under certain circumstances. In January 2019, Georgia Power, MEAG Power, and MEAG SPVJ entered into an agreement to implement the provisions of the MEAG Term Sheet. In February 2019, Georgia Power, the other Vogtle Owners, and MEAG Power's wholly-owned subsidiaries MEAG SPVJ, MEAG SPVM, and MEAG SPVP entered into certain amendments to the Vogtle Joint Ownership Agreements to implement the provisions of the Vogtle Owner Term Sheet (Global Amendments). Pursuant to the Global Amendments: (i) each Vogtle Owner must pay its proportionate share of qualifying construction costs for Plant Vogtle Units 3 and 4 based on its ownership percentage up to the estimated cost at completion (EAC) for Plant Vogtle Units 3 and 4, of which Georgia Power's share is $8.4 billion (VCM 19 Forecast Amount), plus $800 million; (ii) Georgia Power will be responsible for 55.7% of actual qualifying construction costs between $800 million and $1.6 billion over the VCM 19 Forecast Amount (resulting in $80 million of potential additional costs to Georgia Power), with the remaining Vogtle Owners responsible for 44.3% of such costs pro rata in accordance with their respective ownership interests; and (iii) Georgia Power will be responsible for 65.7% of qualifying construction costs between $1.6 billion and $2.1 billion over the VCM 19 Forecast Amount (resulting in a further $100 million of potential additional costs to Georgia Power), with the remaining Vogtle Owners responsible for 34.3% of such costs pro rata in accordance with their respective ownership interests. The Global Amendments provide that if the EAC is revised and exceeds the VCM 19 Forecast Amount by more than $2.1 billion, each of the other Vogtle Owners will have a one-time option at the time the project budget cost forecast is so revised to tender a portion of its ownership interest to Georgia Power in exchange for Georgia Power's agreement to pay 100% of such Vogtle Owner's remaining share of total construction costs in excess of the VCM 19 Forecast Amount plus $2.1 billion. For purposes of the foregoing provisions, qualifying construction costs will not include costs (i) resulting from force majeure events, including epidemics and quarantines, governmental actions or inactions (or significant delays associated with issuance of such actions) that affect the licensing, completion, start-up, operations, or financing of Plant Vogtle Units 3 and 4, administrative proceedings or litigation regarding ITAAC or other regulatory challenges to commencement of operation of Plant Vogtle Units 3 and 4, and changes in laws or regulations governing Plant Vogtle Units 3 and 4, (ii) legal fees and legal expenses incurred due to litigation with contractors or subcontractors that are not subsidiaries or affiliates of Southern Company, and (iii) additional costs caused by requests from the Vogtle Owners other than Georgia Power, except for the exercise of a right to vote granted under the Vogtle Joint Ownership Agreements, that increase costs by $100,000 or more. In addition, pursuant to the Global Amendments, the holders of at least 90% of the ownership interests in Plant Vogtle Units 3 and 4 must vote to continue construction if certain adverse events (Project Adverse Events) occur, including, among other events: (i) the bankruptcy of Toshiba; (ii) the termination or rejection in bankruptcy of certain agreements, including the Vogtle Services Agreement, the Bechtel Agreement, or the agency agreement with Southern Nuclear; (iii) Georgia Power's public announcement of its intention not to submit for rate recovery any portion of its investment in Plant Vogtle Units 3 and 4 or the Georgia PSC determines that any of Georgia Power's costs relating to the construction of Plant Vogtle Units 3 and 4 will not be recovered in retail rates, excluding any additional amounts paid by Georgia Power on behalf of the other Vogtle Owners pursuant to the Global Amendments described above and the first 6% of costs during any six-month VCM reporting period that are disallowed by the Georgia PSC for recovery, or for which Georgia Power elects not to seek cost recovery, through retail rates; and (iv) an incremental extension of one year or more from the seventeenth VCM report estimated in-service dates of November 2021 and November 2022 for Units 3 and 4, respectively. The schedule extension announced in February 2022 triggered the requirement for a vote to continue construction and all the Vogtle Owners voted to continue construction. Georgia Power and the other Vogtle Owners do not agree on either the starting dollar amount for the determination of cost increases subject to the cost-sharing and tender provisions of the Global Amendments or the extent to which COVID-19-related costs impact those provisions. The other Vogtle Owners notified Georgia Power that they believe the project capital cost forecast approved by the Vogtle Owners in February 2022 triggered the tender provisions. In June 2022 and July 2022, OPC and Dalton, respectively, notified Georgia Power of their purported exercises of their tender options. Georgia Power did not accept these purported tender exercises. In June 2022, OPC and MEAG Power each filed a separate lawsuit against Georgia Power in the Superior Court of Fulton County, Georgia seeking a declaratory judgment that the starting dollar amount is $17.1 billion and that the cost-sharing and tender provisions had been triggered. The lawsuits also assert other claims, including breach of contract allegations, and seek, among other remedies, damages and injunctive relief requiring Georgia Power to track and allocate construction costs consistent with MEAG Power's and OPC's interpretations of the Global Amendments. In July 2022, Georgia Power filed its answers in the lawsuits filed by MEAG Power and OPC and included counterclaims seeking a declaratory judgment that the starting dollar amount is $18.38 billion and that costs related to force majeure events are excluded prior to calculating the cost-sharing and tender provisions and when calculating Georgia Power's related financial obligations. In September 2022, Dalton filed complaints in each of these lawsuits. Also in September 2022, Georgia Power and MEAG Power reached an agreement to resolve their dispute regarding the proper interpretation of the cost-sharing and tender provisions of the Global Amendments. Under the terms of the agreement, among other items, (i) MEAG Power will not exercise its tender option and will retain its full ownership interest in Plant Vogtle Units 3 and 4; (ii) Georgia Power will reimburse a portion of MEAG Power's costs of construction for Plant Vogtle Units 3 and 4 as such costs are incurred and with no further adjustment for force majeure costs, which payments will total approximately $92 million based on the current project capital cost forecast; and (iii) Georgia Power will reimburse 20% of MEAG Power's costs of construction with respect to any amounts over the current project capital cost forecast, with no further adjustment for force majeure costs. In addition, MEAG Power agreed to vote to continue construction upon occurrence of a Project Adverse Event unless the commercial operation date of either of Plant Vogtle Unit 3 or Unit 4 is not projected to occur by December 31, 2025. In October 2022, MEAG Power and Georgia Power filed a notice of settlement and voluntary dismissal of their pending litigation, including Georgia Power's counterclaim, and Dalton dismissed its related complaint. Georgia Power recorded pre-tax charges to income through the fourth quarter 2022 of $407 million ($304 million after tax) associated with the cost-sharing and tender provisions of the Global Amendments, including the settlement with MEAG Power. This total is included in the total project capital cost forecast and will not be recovered from retail customers. The settlement with MEAG Power does not resolve the separate pending litigation with OPC, including Dalton's associated complaint, described above. Georgia Power may be required to record further pre-tax charges to income of up to approximately $345 million associated with the cost-sharing and tender provisions of the Global Amendments for OPC and Dalton based on the current project capital cost forecast. Georgia Power's ownership interest in Plant Vogtle Units 3 and 4 continues to be 45.7%. Georgia Power believes the increases in the total project capital cost forecast through December 31, 2022 triggered the tender provisions, but Georgia Power disagrees with OPC and Dalton on the tender provisions trigger date. Valid notices of tender from OPC and Dalton would require Georgia Power to pay 100% of their respective remaining shares of the costs necessary to complete Plant Vogtle Units 3 and 4. Georgia Power's incremental ownership interest will be calculated and conveyed to Georgia Power after Plant Vogtle Units 3 and 4 are placed in service. The ultimate outcome of these matters cannot be determined at this time. Regulatory Matters In 2009, the Georgia PSC voted to certify construction of Plant Vogtle Units 3 and 4 with a certified capital cost of $4.418 billion. In addition, in 2009 the Georgia PSC approved inclusion of the Plant Vogtle Units 3 and 4 related CWIP accounts in rate base, and the State of Georgia enacted the Georgia Nuclear Energy Financing Act, which allows Georgia Power to recover financing costs for Plant Vogtle Units 3 and 4. Financing costs are recovered on all applicable certified costs through annual adjustments to the NCCR tariff up to the certified capital cost of $4.418 billion. At June 30, 2023, Georgia Power had recovered approximately $3.0 billion of financing costs. Financing costs related to capital costs above $4.418 billion are being recognized through AFUDC and are expected to be recovered through retail rates over the life of Plant Vogtle Units 3 and 4; however, Georgia Power is not recording AFUDC related to any capital costs in excess of the total deemed reasonable by the Georgia PSC (currently $7.3 billion) and not requested for rate recovery. In December 2022, the Georgia PSC approved Georgia Power's filing to increase the NCCR tariff by $36 million annually, effective January 1, 2023. Georgia Power is required to file semi-annual VCM reports with the Georgia PSC by February 28 and August 31 of each year. In 2013, in connection with the eighth VCM report, the Georgia PSC approved a stipulation between Georgia Power and the staff of the Georgia PSC to waive the requirement to amend the Plant Vogtle Units 3 and 4 certificate in accordance with the 2009 certification order until the completion of Plant Vogtle Unit 3, or earlier if deemed appropriate by the Georgia PSC and Georgia Power. In 2016, the Georgia PSC voted to approve a settlement agreement (Vogtle Cost Settlement Agreement) resolving certain prudency matters in connection with the fifteenth VCM report. In December 2017, the Georgia PSC voted to approve (and issued its related order on January 11, 2018) Georgia Power's seventeenth VCM report and modified the Vogtle Cost Settlement Agreement. The Vogtle Cost Settlement Agreement, as modified by the January 11, 2018 order, resolved the following regulatory matters related to Plant Vogtle Units 3 and 4: (i) none of the $3.3 billion of costs incurred through December 31, 2015 and reflected in the fourteenth VCM report should be disallowed from rate base on the basis of imprudence; (ii) the Contractor Settlement Agreement was reasonable and prudent and none of the $0.3 billion paid pursuant to the Contractor Settlement Agreement should be disallowed from rate base on the basis of imprudence; (iii) (a) capital costs incurred up to $5.68 billion would be presumed to be reasonable and prudent with the burden of proof on any party challenging such costs, (b) Georgia Power would have the burden to show that any capital costs above $5.68 billion were prudent, and (c) a revised capital cost forecast of $7.3 billion (after reflecting the impact of payments received under the Guarantee Settlement Agreement and related customer refunds) was found reasonable; (iv) construction of Plant Vogtle Units 3 and 4 should be completed, with Southern Nuclear serving as project manager and Bechtel as primary contractor; (v) approved and deemed reasonable Georgia Power's revised schedule placing Plant Vogtle Units 3 and 4 in service in November 2021 and November 2022, respectively; (vi) confirmed that the revised cost forecast does not represent a cost cap and that a prudence proceeding on cost recovery will occur following Unit 4 fuel load, consistent with applicable Georgia law; (vii) reduced the ROE used to calculate the NCCR tariff (a) from 10.95% (the ROE rate setting point authorized by the Georgia PSC at that time) to 10.00% effective January 1, 2016, (b) from 10.00% to 8.30%, effective January 1, 2020, and (c) from 8.30% to 5.30%, effective January 1, 2021 (provided that the ROE in no case will be less than Georgia Power's average cost of long-term debt); (viii) reduced the ROE used for AFUDC equity for Plant Vogtle Units 3 and 4 from 10.00% to Georgia Power's average cost of long-term debt, effective January 1, 2018; and (ix) agreed that effective the first month after Unit 3 reaches commercial operation, retail base rates would be adjusted to include the costs related to Unit 3 and common facilities deemed prudent in the Vogtle Cost Settlement Agreement. On July 31, 2023, Georgia Power notified the Georgia PSC that Unit 3 had reached commercial operation, and, effective August 1, 2023, Georgia Power adjusted retail base rates for Unit 3 and the common facilities shared between Units 3 and 4 (see "Plant Vogtle Unit 3 and Common Facilities Rate Proceeding" herein for additional information). The January 11, 2018 order also stated that if Plant Vogtle Units 3 and 4 are not commercially operational by June 1, 2021 and June 1, 2022, respectively, the ROE used to calculate the NCCR tariff will be further reduced by 10 basis points each month (but not lower than Georgia Power's average cost of long-term debt) until the respective Unit is commercially operational. The ROE reductions negatively impacted earnings by approximately $300 million in 2022 and are estimated to have negative earnings impacts of approximately $290 million in 2023 and $60 million in 2024. In its January 11, 2018 order, the Georgia PSC also stated if other conditions change and assumptions upon which Georgia Power's seventeenth VCM report are based do not materialize, the Georgia PSC reserved the right to reconsider the decision to continue construction. In the August 2021 order approving the twenty-fourth VCM report, the Georgia PSC approved a stipulation addressing the following matters: (i) beginning with its twenty-fifth VCM report, Georgia Power will continue to report to the Georgia PSC all costs incurred during the period for review and will request for approval costs up to the $7.3 billion determined to be reasonable in the Georgia PSC's seventeenth VCM order and (ii) Georgia Power will not seek rate recovery of the $0.7 billion increase to the base capital cost forecast included in the nineteenth VCM report and charged to income by Georgia Power in the second quarter 2018. In addition, the stipulation confirms Georgia Power may request verification and approval of costs above $7.3 billion for inclusion in rate base at a later time, but no earlier than the prudence review contemplated by the seventeenth VCM order described previously. The Georgia PSC has approved 25 VCM reports covering periods through June 30, 2021. These reports reflect total construction capital costs incu

Contingencies

Contingencies	6 Months Ended
Contingencies	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Contingencies	CONTINGENCIESSee Note 3 to the financial statements in Item 8 of the Form 10-K for information relating to various lawsuits and other contingencies. General Litigation Matters The Registrants are involved in various matters being litigated and regulatory matters. The ultimate outcome of such pending or potential litigation or regulatory matters against each Registrant and any subsidiaries cannot be determined at this time; however, for current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on such Registrant's financial statements. The Registrants believe the pending legal challenges discussed below have no merit; however, the ultimate outcome of these matters cannot be determined at this time. Alabama Power In September 2022, Mobile Baykeeper filed a citizen suit in the U.S. District Court for the Southern District of Alabama alleging that Alabama Power's plan to close the Plant Barry ash pond utilizing a closure-in-place methodology violates the Resource Conservation and Recovery Act (RCRA) and regulations governing CCR. Among other relief requested, Mobile Baykeeper seeks a declaratory judgment that the RCRA and regulations governing CCR are being violated, preliminary and injunctive relief to prevent implementation of Alabama Power's closure plan and the development of a closure plan that satisfies regula tions governing CCR requirements. On December 19, 2022, Alabama Power filed a motion to dismiss the case. On January 31, 2023, the EPA issued a Notice of Potential Violations associated with Alabama Power's plan to close the Plant Barry ash pond. Ala bama Power has affirmed to the EPA its position that it is in compliance with CCR requirements. The ultimate outcome of these matters cannot be determined at this time but could have a material impact on Alabama Power's ARO estimates and cash flows. See Note 6 to the financial statements in Item 8 of the Form 10-K for a discussion of Alabama Power's ARO liabilities. Georgia Power Municipal Franchise Fees In 2011, plaintiffs filed a putative class action against Georgia Power in the Superior Court of Fulton County, Georgia alleging that Georgia Power's collection in rates of amounts for municipal franchise fees (which fees are paid to municipalities) exceeded the amounts allowed in orders of the Georgia PSC and alleging certain state law claims. This case has been ruled upon and appealed numerous times over the last several years. In 2019, the Georgia PSC issued an order that found Georgia Power has appropriately implemented the municipal franchise fee schedule. In March 2021, the Superior Court of Fulton County granted class certification and Georgia Power's motion for summary judgment and the plaintiffs filed a notice of appeal. In April 2021, Georgia Power filed a notice of cross appeal on the issue of class certification. In December 2021, the Georgia Court of Appeals affirmed the Superior Court's ruling that granted summary judgment to Georgia Power and dismissed Georgia Power's cross appeal on the issue of class certification as moot. Also in December 2021, the plaintiffs filed a petition for writ of certiorari to the Georgia Supreme Court, which was denied on January 27, 2023. On February 6, 2023, the plaintiffs filed a motion for reconsideration with the Georgia Supreme Court, which was denied on February 16, 2023. This matter is now concluded. Plant Scherer In July 2020, a group of individual plaintiffs filed a complaint, which was amended in December 2022, in the Superior Court of Fulton County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer has impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs seek an unspecified amount of monetary damages including punitive damages, a medical monitoring fund, and injunctive relief. In December 2022, the Superior Court of Fulton County, Georgia granted Georgia Power's motion to transfer the case to the Superior Court of Monroe County, Georgia. On May 9, 2023, the Superior Court of Monroe County, Georgia denied Georgia Power's motion to dismiss the case for lack of subject matter jurisdiction. On July 27, 2023, the Superior Court of Monroe County, Georgia denied the remaining motions to dismiss certain claims and plaintiffs that Georgia Power filed at the outset of the case. In October 2021, February 2022, and January 2023, a total of eight additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that releases from Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries and property damage. The plaintiffs sought an unspecified amount of monetary damages including punitive damages. After Georgia Power removed these cases to the U.S. District Court for the Middle District of Georgia, the plaintiffs voluntarily dismissed their complaints without prejudice in November 2022 and January 2023. On May 12, 2023, the plaintiffs in the cases originally filed in October 2021, February 2022, and January 2023 refiled their eight complaints in the Superior Court of Monroe County, Georgia. Also on May 12, 2023, a new complaint was filed in the Superior Court of Monroe County, Georgia against Georgia Power alleging that the construction and operation of Plant Scherer have impacted groundwater and air, resulting in alleged personal injuries. The plaintiff seeks an unspecified amount of monetary damages, including punitive damages. On May 18, 2023, Georgia Power removed all of these cases to the U.S. District Court for the Middle District of Georgia. The plaintiffs are requesting the court remand the cases back to the Superior Court of Monroe County, Georgia. The amount of any possible losses from these matters cannot be estimated at this time. Mississippi Power In 2018, Ray C. Turnage and 10 other individual plaintiffs filed a putative class action complaint against Mississippi Power and the three then-serving members of the Mississippi PSC in the U.S. District Court for the Southern District of Mississippi, which was amended in March 2019 to include four additional plaintiffs. Mississippi Power received Mississippi PSC approval in 2013 to charge a mirror CWIP rate premised upon including in its rate base pre-construction and construction costs for the Kemper IGCC prior to placing the Kemper IGCC into service. The Mississippi Supreme Court reversed that approval and ordered Mississippi Power to refund the amounts paid by customers under the previously-approved mirror CWIP rate. The plaintiffs allege that the initial approval process, and the amount approved, were improper and make claims for gross negligence, reckless conduct, and intentional wrongdoing. They also allege that Mississippi Power underpaid customers by up to $23.5 million in the refund process by applying an incorrect interest rate. The plaintiffs seek to recover, on behalf of themselves and their putative class, actual damages, punitive damages, pre-judgment interest, post-judgment interest, attorney's fees, and costs. The district court dismissed the amended complaint; however, in March 2020, the plaintiffs filed a motion seeking to name the new members of the Mississippi PSC, the Mississippi Development Authority, and Southern Company as additional defendants and add a cause of action against all defendants based on a dormant commerce clause theory under the U.S. Constitution. In July 2020, the plaintiffs filed a motion for leave to file a third amended complaint, which included the same federal claims as the proposed second amended complaint, as well as several additional state law claims based on the allegation that Mississippi Power failed to disclose the annual percentage rate of interest applicable to refunds. In November 2020, the district court denied each of the plaintiffs' pending motions and entered final judgment in favor of Mississippi Power. In January 2021, the district court denied further motions by the plaintiffs to vacate the judgment and to file a revised second amended complaint. In February 2021, the plaintiffs filed a notice of appeal with the U.S. Court of Appeals for the Fifth Circuit. In March 2022, the U.S. Court of Appeals for the Fifth Circuit issued an opinion affirming the dismissal of the claims against the Mississippi PSC defendants but reversing the dismissal of the claims against Mississippi Power. In May 2022, the U.S. Court of Appeals for the Fifth Circuit denied a petition by Mississippi Power for a rehearing en banc and remanded the case to the U.S. District Court for the Southern District of Mississippi for further proceedings. In June 2022, Mississippi Power filed with the trial court a motion to dismiss the complaint with prejudice, which was granted on March 15, 2023. On March 28, 2023, the plaintiffs filed a notice of appeal with the U.S. Court of Appeals for the Fifth Circuit. An adverse outcome in this proceeding could have a material impact on Mississippi Power's financial statements. Environmental Remediation The Southern Company system must comply with environmental laws and regulations governing the handling and disposal of waste and releases of hazardous substances. Under these various laws and regulations, the Southern Company system could incur substantial costs to clean up affected sites. The traditional electric operating companies and the natural gas distribution utilities in Illinois and Georgia have each received authority from their respective state PSCs or other applicable state regulatory agencies to recover approved environmental remediation costs through regulatory mechanisms. These regulatory mechanisms are adjusted annually or as necessary within limits approved by the state PSCs or other applicable state regulatory agencies. Georgia Power's environmental remediation liability was $14 million and $15 million at June 30, 2023 and December 31, 2022, respectively. Georgia Power has been designated or identified as a potentially responsible party at sites governed by the Georgia Hazardous Site Response Act and/or by the federal Comprehensive Environmental Response, Compensation, and Liability Act, and assessment and potential cleanup of such sites is expected. Southern Company Gas' environmental remediation liability was $230 million and $256 million at June 30, 2023 and December 31, 2022, respectively, based on the estimated cost of environmental investigation and remediation associated with known former manufactured gas plant operating sites. Other Matters Traditional Electric Operating Companies In April 2019, Bellsouth Telecommunications d/b/a AT&T Alabama (AT&T) filed a complaint against Alabama Power with the FCC alleging that the pole rental rate AT&T is required to pay pursuant to the parties' joint use agreement is unjust and unreasonable under federal law. The complaint sought a new rate and approximately $87 million in refunds of alleged overpayments for the preceding six years. In August 2019, the FCC stayed the case in favor of arbitration, which AT&T has not pursued. The ultimate outcome of this matter cannot be determined at this time, but an adverse outcome could have a material impact on the financial statements of Southern Company and Alabama Power. Georgia Power and Mississippi Power have joint use agreements with other AT&T affiliates. Mississippi Power

Revenue from Contracts with Cus

Revenue from Contracts with Customers and Lease Income	6 Months Ended
Revenue from Contracts with Customers and Lease Income	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers and Lease Income	REVENUE FROM CONTRACTS WITH CUSTOMERS AND LEASE INCOME Revenue from Contracts with Customers The Registrants generate revenues from a variety of sources, some of which are not accounted for as revenue from contracts with customers, such as leases, derivatives, and certain cost recovery mechanisms. See Note 1 to the financial statements under "Revenues" in Item 8 of the Form 10-K for additional information on the revenue policies of the Registrants. See "Lease Income" herein and Note (J) for additional information on revenue accounted for under lease and derivative accounting guidance, respectively. The following table disaggregates revenue from contracts with customers for the three and six months ended June 30, 2023 and 2022: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2023 Operating revenues Retail electric revenues Residential $ 1,647 $ 648 $ 928 $ 71 $ — $ — Commercial 1,370 465 830 75 — — Industrial 864 429 353 82 — — Other 27 3 22 2 — — Total retail electric revenues 3,908 1,545 2,133 230 — — Natural gas distribution revenues Residential 330 — — — — 330 Commercial 82 — — — — 82 Transportation 284 — — — — 284 Industrial 6 — — — — 6 Other 51 — — — — 51 Total natural gas distribution revenues 753 — — — — 753 Wholesale electric revenues PPA energy revenues 253 58 24 2 175 — PPA capacity revenues 149 44 13 2 91 — Non-PPA revenues 61 12 6 70 83 — Total wholesale electric revenues 463 114 43 74 349 — Other natural gas revenues Gas marketing services 73 — — — — 73 Other natural gas revenues 8 — — — — 8 Total natural gas revenues 81 — — — — 81 Other revenues 327 43 145 10 16 — Total revenue from contracts with customers 5,532 1,702 2,321 314 365 834 Other revenue sources () 216 (13) 70 (3) 160 18 Total operating revenues $ 5,748 $ 1,689 $ 2,391 $ 311 $ 525 $ 852 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Six Months Ended June 30, 2023 Operating revenues Retail electric revenues Residential $ 3,174 $ 1,308 $ 1,730 $ 136 $ — $ — Commercial 2,619 894 1,582 143 — — Industrial 1,653 827 666 160 — — Other 54 6 44 4 — — Total retail electric revenues 7,500 3,035 4,022 443 — — Natural gas distribution revenues Residential 1,226 — — — — 1,226 Commercial 314 — — — — 314 Transportation 603 — — — — 603 Industrial 29 — — — — 29 Other 168 — — — — 168 Total natural gas distribution revenues 2,340 — — — — 2,340 Wholesale electric revenues PPA energy revenues 534 129 35 5 376 — PPA capacity revenues 341 105 25 34 179 — Non-PPA revenues 98 32 10 178 187 — Total wholesale electric revenues 973 266 70 217 742 — Other natural gas revenues Gas marketing services 304 — — — — 304 Other natural gas revenues 20 — — — — 20 Total natural gas revenues 324 — — — — 324 Other revenues 640 103 276 22 27 — Total revenue from contracts with customers 11,777 3,404 4,368 682 769 2,664 Other revenue sources () 451 (68) 199 20 264 64 Total operating revenues $ 12,228 $ 3,336 $ 4,567 $ 702 $ 1,033 $ 2,728 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2022 Operating revenues Retail electric revenues Residential $ 1,655 $ 617 $ 962 $ 76 $ — $ — Commercial 1,387 410 900 77 — — Industrial 1,005 368 553 84 — — Other 25 3 20 2 — — Total retail electric revenues 4,072 1,398 2,435 239 — — Natural gas distribution revenues Residential 474 — — — — 474 Commercial 130 — — — — 130 Transportation 276 — — — — 276 Industrial 16 — — — — 16 Other 67 — — — — 67 Total natural gas distribution revenues 963 — — — — 963 Wholesale electric revenues PPA energy revenues 585 108 40 5 441 — PPA capacity revenues 136 40 12 — 85 — Non-PPA revenues 62 35 6 169 196 — Total wholesale electric revenues 783 183 58 174 722 — Other natural gas revenues Gas marketing services 90 — — — — 90 Other natural gas revenues 10 — — — — 10 Total natural gas revenues 100 — — — — 100 Other revenues 308 63 121 9 9 — Total revenue from contracts with customers 6,226 1,644 2,614 422 731 1,063 Other revenue sources () 980 287 507 12 168 20 Total operating revenues $ 7,206 $ 1,931 $ 3,121 $ 434 $ 899 $ 1,083 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Six Months Ended June 30, 2022 Operating revenues Retail electric revenues Residential $ 3,179 $ 1,250 $ 1,783 $ 146 $ — $ — Commercial 2,567 786 1,638 143 — — Industrial 1,732 691 887 154 — — Other 51 7 40 4 — — Total retail electric revenues 7,529 2,734 4,348 447 — — Natural gas distribution revenues Residential 1,490 — — — — 1,490 Commercial 400 — — — — 400 Transportation 613 — — — — 613 Industrial 48 — — — — 48 Other 195 — — — — 195 Total natural gas distribution revenues 2,746 — — — — 2,746 Wholesale electric revenues PPA energy revenues 930 168 72 8 694 — PPA capacity revenues 268 78 23 3 166 — Non-PPA revenues 124 99 15 271 269 — Total wholesale electric revenues 1,322 345 110 282 1,129 — Other natural gas revenues Gas marketing services 333 — — — — 333 Other natural gas revenues 26 — — — — 26 Total natural gas revenues 359 — — — — 359 Other revenues 530 109 216 17 17 — Total revenue from contracts with customers 12,486 3,188 4,674 746 1,146 3,105 Other revenue sources () 1,368 392 654 23 292 35 Total operating revenues $ 13,854 $ 3,580 $ 5,328 $ 769 $ 1,438 $ 3,140 (*) Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies. Contract Balances The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at June 30, 2023 and December 31, 2022: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Accounts Receivable At June 30, 2023 $ 2,423 $ 670 $ 986 $ 101 $ 126 $ 461 At December 31, 2022 3,123 696 922 92 237 1,107 Contract Assets At June 30, 2023 $ 167 $ — $ 73 $ — $ — $ 30 At December 31, 2022 156 2 89 — — — Contract Liabilities At June 30, 2023 $ 73 $ 1 $ 28 $ 3 $ 1 $ — At December 31, 2022 45 4 9 — 1 — Contract assets for Georgia Power primarily relate to retail customer fixed bill programs, where the payment is contingent upon Georgia Power's continued performance and the customer's continued participation in the program over a one-year contract term, and unregulated service agreements, where payment is contingent on project completion. Contract liabilities for Georgia Power primarily relate to cash collections recognized in advance of revenue for unregulated service agreements and retail customer fixed bill programs. At June 30, 2023, Southern Company Gas' contract assets relate to work performed on an energy efficiency enhancement and upgrade contract with the U.S. General Services Administration. Southern Company Gas receives cash advances from a third-party financial institution to fund work performed, of which approximately $41 million had been received at June 30, 2023. These advances have been accounted for as long-term debt on the balance sheets. See Note 1 to the financial statements under "Affiliate Transactions" in Item 8 of the Form 10-K for additional information regarding the construction contract. At June 30, 2023 and December 31, 2022, Southern Company's unregulated distributed generation business had contract assets of $64 million and $65 million, respectively, and contract liabilities of $42 million and $32 million, respectively, for outstanding performance obligations. Revenues recognized in the three and six months ended June 30, 2023, which were included in contract liabilities at December 31, 2022, were immaterial for the applicable Registrants. Contract liabilities are primarily classified as current on the balance sheets as the corresponding revenues are generally expected to be recognized within one year. Remaining Performance Obligations The Subsidiary Registrants may enter into long-term contracts with customers in which revenues are recognized as performance obligations are satisfied over the contract term. For Alabama Power, Georgia Power, and Southern Power, these contracts primarily relate to PPAs whereby electricity and generation capacity are provided to a customer. The revenue recognized for the delivery of electricity is variable; however, certain PPAs include a fixed payment for fixed generation capacity over the term of the contract. For Southern Company Gas, these contracts primarily relate to the U.S. General Services Administration contract described above. Southern Company's unregulated distributed generation business also has partially satisfied performance obligations related to certain fixed price contracts. Revenues from contracts with customers related to these performance obligations remaining at June 30, 2023 are expected to be recognized as follows: 2023 (remaining) 2024 2025 2026 2027 Thereafter (in millions) Southern Company $ 333 $ 544 $ 351 $ 316 $ 319 $ 2,089 Alabama Power 11 8 7 — — — Georgia Power 43 58 28 14 14 23 Southern Power 188 358 302 303 310 2,077 Southern Company Gas 11 29 — — — — Lease Income Lease income for the three and six months ended June 30, 2023 and 2022 is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) For the Three Months Ended June 30, 2023 Lease income - interest income on sales-type leases $ 6 $ — $ — $ 4 $ 2 $ — Lease income - operating leases 42 11 7 1 21 9 Variable lease income 123 — — — 132 — Total lease income $ 171 $ 11 $ 7 $ 5 $ 155 $ 9 For the Six Months Ended June 30, 2023 Lease income - interest income on sales-type leases $ 12 $ — $ — $ 7 $ 5 $ — Lease income - operating leases 92 29 14 2 42 18 Variable lease income 192 — — — 207 — Total lease income $ 296 $ 29 $ 14 $ 9 $ 254 $ 18 For the Three Months Ended June 30, 2022 Lease income - interest income on sales-type leases $ 7 $ — $ — $ 4 $ 3 $ — Lease income - operating leases 52 19 8 — 21 9 Variable lease income 129 — — — 138 — Total lease income $ 188 $ 19 $ 8 $ 4 $ 162 $ 9 For the Six Months Ended June 30, 2022 Lease income - interest income on sales-type leases $ 13 $ — $ — $ 8 $ 5 $ — Lease income - operating leases 105 39 16 1 42 18 Variable lease income 211 — — — 227 — Total lease income $ 329 $ 39 $ 16 $ 9 $ 274 $ 18 Lease payments received under tolling arrangements and PPAs consist of either scheduled payments or variable payments based on the amount of energy produced by the underlying electric generating units. Lease income for Alabama Power and Southern Power is included in wholesale revenues.

Consolidated Entities and Equit

Consolidated Entities and Equity Method Investments	6 Months Ended
Consolidated Entities and Equity Method Investments	Jun. 30, 2023
Regulated Operations [Abstract]
Consolidated Entities and Equity Method Investments	CONSOLIDATED ENTITIES AND EQUITY METHOD INVESTMENTSSee Note 7 to the financial statements in Item 8 of the Form 10-K for additional information. Southern Company At June 30, 2023 and December 31, 2022, Southern Holdings had equity method investments totaling $122 million and $112 million, respectively, primarily related to investments in venture capital funds focused on energy and utility investments. Earnings from these investments were immaterial for all periods presented. Southern Power Variable Interest Entities Southern Power has certain subsidiaries that are determined to be VIEs. Southern Power is considered the primary beneficiary of these VIEs because it controls the most significant activities of the VIEs, including operating and maintaining the respective assets, and has the obligation to absorb expected losses of these VIEs to the extent of its equity interests. SP Solar and SP Wind At June 30, 2023 and December 31, 2022, SP Solar had total assets of $5.8 billion and $5.9 billion, respectively, total liabilities of $0.4 billion, and noncontrolling interests of $1.0 billion and $1.1 billion, respectively. Cash distributions from SP Solar are allocated 67% to Southern Power and 33% to Global Atlantic in accordance with their partnership interest percentage. Under the terms of the limited partnership agreement, distributions without limited partner consent are limited to available cash and SP Solar is obligated to distribute all such available cash to its partners each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves. At June 30, 2023 and December 31, 2022, SP Wind had total assets of $2.2 billion, total liabilities of $175 million and $169 million, respectively, and noncontrolling interests of $39 million. Under the terms of the limited liability agreement, distributions without Class A member consent are limited to available cash and SP Wind is obligated to distribute all such available cash to its members each quarter. Available cash includes all cash generated in the quarter subject to the maintenance of appropriate operating reserves. Cash distributions from SP Wind are generally allocated 60% to Southern Power and 40% to the three financial investors in accordance with the limited liability agreement. Southern Power consolidates both SP Solar and SP Wind, as the primary beneficiary, since it controls the most significant activities of each entity, including operating and maintaining their assets. Certain transfers and sales of the assets in the VIEs are subject to partner consent and the liabilities are non-recourse to the general credit of Southern Power. Liabilities consist of customary working capital items and do not include any long-term debt. Other Variable Interest Entities Southern Power has other consolidated VIEs that relate to certain subsidiaries that have either sold noncontrolling interests to tax equity investors or acquired less than a 100% interest from facility developers. These entities are considered VIEs because the arrangements are structured similar to a limited partnership and the noncontrolling members do not have substantive kick-out rights. At June 30, 2023 and December 31, 2022, the other VIEs had total assets of $1.7 billion and $1.8 billion, respectively, total liabilities of $0.2 billion, and noncontrolling interests of $0.8 billion. Under the terms of the partnership agreements, distributions of all available cash are required each month or quarter and additional distributions require partner consent. Equity Method Investments At December 31, 2022, Southern Power had equity method investments in wind and battery energy storage projects totaling $49 million. During the first quarter 2023, Southern Power sold its remaining equity method investments in the projects and received proceeds of $50 million. Earnings (loss) from these investments, including the gains associated with the sales, were immaterial for all periods presented. Southern Company Gas Equity Method Investments The carrying amounts of Southern Company Gas' equity method investments at June 30, 2023 and December 31, 2022 and related earnings from those investments for the three and six months ended June 30, 2023 and 2022 were as follows: Investment Balance June 30, 2023 December 31, 2022 (in millions) SNG $ 1,220 $ 1,243 Other 32 33 Total $ 1,252 $ 1,276 Three Months Ended June 30, Six Months Ended June 30, Earnings from Equity Method Investments 2023 2022 2023 2022 (in millions) SNG $ 28 $ 31 $ 72 $ 70 Other — — — 1 Total $ 28 $ 31 $ 72 $ 71

Financing and Leases

Financing and Leases	6 Months Ended
Financing and Leases	Jun. 30, 2023
Debt Disclosure [Abstract]
Financing and Leases	FINANCING AND LEASES Bank Credit Arrangements See Note 8 to the financial statements under "Bank Credit Arrangements" in Item 8 of the Form 10-K for additional information. At June 30, 2023, committed credit arrangements with banks were as follows: Expires Company 2024 2025 2026 2028 Total Unused Expires within (in millions) Southern Company parent (a) $ 150 $ — $ — $ 1,850 $ 2,000 $ 1,998 $ 150 Alabama Power 550 — — 700 1,250 1,250 — Georgia Power — — — 1,750 1,750 1,726 — Mississippi Power — 125 150 — 275 275 — Southern Power (a)(b) — — — 600 600 589 — Southern Company Gas (c) 100 — — 1,500 1,600 1,598 100 SEGCO 30 — — — 30 30 30 Southern Company $ 830 $ 125 $ 150 $ 6,400 $ 7,505 $ 7,466 $ 280 (a) Arrangement expiring in 2028 represents a $2.45 billion combined arrangement for Southern Company and Southern Power as borrowers. Pursuant to the combined facility, the allocations between Southern Company and Southern Power may be adjusted. (b) Does not include Southern Power Company's $75 million and $100 million continuing letter of credit facilities for standby letters of credit, expiring in 2025 and 2026, respectively, of which $9 million and $16 million, respectively, was unused at June 30, 2023. In March 2023, Southern Power amended the $100 million letter of credit facility, which, among other things, extended the expiration date from 2025 to 2026 and increased the amount from $75 million. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities. (c) Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, which is the borrower of $800 million of the credit arrangement expiring in 2028. Southern Company Gas' committed credit arrangement expiring in 2028 also includes $700 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas. Pursuant to the multi-year credit arrangement expiring in 2028, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower under a $100 million credit arrangement expiring in 2024. As reflected in the table above, in May 2023, Southern Company and Southern Power combined and extended their multi-year credit arrangements previously maturing in 2026, resulting in a single aggregate $2.45 billion facility (currently allocated $1.85 billion for Southern Company and $600 million for Southern Power) maturing in 2028. Pursuant to the combined facility, the allocations between Southern Company and Southern Power may be adjusted. Alabama Power, Georgia Power, and Southern Company Gas Capital, along with Nicor Gas, amended and restated certain of their multi-year credit arrangements, which, among other things, extended the maturity dates from 2026 to 2028. Mississippi Power amended and restated certain of its multi-year credit arrangements aggregating $150 million, which, among other things, extended the maturity dates from 2024 to 2026. Nicor Gas also entered into a $100 million credit arrangement maturing in 2024 to replace its $250 million credit arrangement that expired in 2023. In June 2023, Southern Company also entered into a new $150 million credit arrangement maturing in 2024. Subject to applicable market conditions, Southern Company and its subsidiaries expect to renew or replace their bank credit arrangements as needed, prior to expiration. In connection therewith, Southern Company and its subsidiaries may extend the maturity dates and/or increase or decrease the lending commitments thereunder. These bank credit arrangements, as well as the term loan arrangements of the Registrants, Nicor Gas, and SEGCO, contain covenants that limit debt levels and contain cross-acceleration provisions to other indebtedness (including guarantee obligations) that are restricted only to the indebtedness of the individual company. The cross-acceleration provisions to other indebtedness would trigger an event of default if the applicable borrower defaulted on indebtedness, the payment of which was then accelerated. At June 30, 2023, the Registrants, Nicor Gas, and SEGCO were in compliance with all such covenants. None of the bank credit arrangements contain material adverse change clauses at the time of borrowings. A portion of the unused credit with banks is allocated to provide liquidity support to the revenue bonds of the traditional electric operating companies and the commercial paper programs of the Registrants, Nicor Gas, and SEGCO. The amount of variable rate revenue bonds of the traditional electric operating companies outstanding requiring liquidity support at June 30, 2023 was approximately $1.4 billion (comprised of approximately $492 million at Alabama Power, $819 million at Georgia Power, and $69 million at Mississippi Power). In addition, at June 30, 2023, Alabama Power and Georgia Power had approximately $120 million and $225 million, respectively, of fixed rate revenue bonds outstanding that are required to be remarketed within the next 12 months. Convertible Senior Notes In February 2023, Southern Company issued $1.5 billion aggregate principal amount of Series 2023A 3.875% Convertible Senior Notes due December 15, 2025 (Series 2023A Convertible Senior Notes). In March 2023, Southern Company issued an additional $225 million aggregate principal amount of the Series 2023A Convertible Senior Notes upon the exercise by the initial purchasers of their over-allotment option. Interest on the Series 2023A Convertible Senior Notes is payable semiannually, beginning June 15, 2023. The Series 2023A Convertible Senior Notes will mature on December 15, 2025, unless earlier converted or repurchased, but are not redeemable at the option of Southern Company. The Series 2023A Convertible Senior Notes are direct, unsecured, and unsubordinated obligations of Southern Company, ranking equally with all of Southern Company's other unsecured and unsubordinated indebtedness from time to time outstanding, and are effectively subordinated to all secured indebtedness of Southern Company. Holders may convert their Series 2023A Convertible Senior Notes at their option prior to the close of business on the business day preceding September 15, 2025, but only under the following circumstances: • during any calendar quarter (and only during such calendar quarter), if the last reported sale price of Southern Company's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day as determined by Southern Company; • during the five business day period after any 10 consecutive trading day period (Measurement Period) in which the trading price per $1,000 principal amount of Series 2023A Convertible Senior Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of the common stock and the conversion rate on each such trading day; or • upon the occurrence of certain corporate events specified in the indenture governing the Series 2023A Convertible Senior Notes. On or after September 15, 2025, a holder may convert all or any portion of its Series 2023A Convertible Senior Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions. Southern Company will settle conversions of the Series 2023A Convertible Senior Notes by paying cash up to the aggregate principal amount of the Series 2023A Convertible Senior Notes to be converted and paying or delivering, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at Southern Company's election, in respect of the remainder, if any, of Southern Company's conversion obligation in excess of the aggregate principal amount of the Series 2023A Convertible Senior Notes being converted. The Series 2023A Convertible Senior Notes are initially convertible at a rate of 11.8818 shares of common stock per $1,000 principal amount converted, which is approximately equal to $84.16 per share of common stock. The conversion rate will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the indenture governing the Series 2023A Convertible Senior Notes), Southern Company will, in certain circumstances, increase the conversion rate by a number of additional shares of common stock for conversions in connection with the make-whole fundamental change. Upon the occurrence of a fundamental change (as defined in the indenture governing the Series 2023A Convertible Senior Notes), holders of the Series 2023A Convertible Senior Notes may require Southern Company to purchase all or a portion of their Series 2023A Convertible Senior Notes, in principal amounts equal to $1,000 or an integral multiple thereof, for cash at a price equal to 100% of the principal amount of the Series 2023A Convertible Senior Notes to be purchased plus any accrued and unpaid interest. Earnings per Share For Southern Company, the only difference in computing basic and diluted earnings per share (EPS) is attributable to awards outstanding under stock-based compensation plans, the Series 2023A Convertible Senior Notes, and the equity units issued in 2019 and settled in August 2022. EPS dilution resulting from stock-based compensation plans and the equity units is determined using the treasury stock method and EPS dilution resulting from the Series 2023A Convertible Senior Notes is determined using the net share settlement method. See Note 12 to the financial statements in Item 8 of the Form 10-K, "Convertible Senior Notes" herein, and Note 8 to the financial statements under "Equity Units" in Item 8 of the Form 10-K for additional information. Shares used to compute diluted EPS were as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (in millions) As reported shares 1,092 1,065 1,092 1,064 Effect of stock-based compensation 6 5 6 5 Effect of equity units — 2 — 1 Diluted shares 1,098 1,072 1,098 1,070 For all periods presented, an immaterial number of stock-based compensation awards was excluded from the diluted EPS calculation because the awards were anti-dilutive. For all periods presented, there was no dilution resulting from the Series 2023A Convertible Senior Notes. Southern Company Leveraged Lease See Note 9 to the financial statements in Item 8 of the Form 10-K for information on a leveraged lease agreement related to energy generation. In June 2022, the Southern Holdings subsidiary operating the generating plant for the lessee provided notice to the lessee to terminate the related operating and maintenance agreement effective June 30, 2023. Subsequently, the lessee failed to make the semi-annual lease payment due in December 2022. As a result, the Southern Holdings subsidiary was unable to make its corresponding payment to the holders of the underlying non-recourse debt related to the generation assets. The parties to the lease entered into forbearance agreements which suspended the related contractual rights of the parties while they continued restructuring negotiations, during which the termination date for the operating and maintenance agreement was delayed until July 31, 2023. The negotiations were completed on July 14, 2023, resulting in the Southern Holdings subsidiary agreeing to continue operating the plant for the lessee until the lessee's associated power off-take agreement ends in 2032, subject to certain terms and conditions. The restructuring had no material impact on Southern Company's financial statements. Southern Company will continue to monitor the operational performance of the underlying assets and evaluate the ability of the lessee to continue to meet its obligations, including those associated with a future closure or retirement of the generation assets and associated properties, including the dry ash landfill.

Income Taxes

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES See Note 10 to the financial statements in Item 8 of the Form 10-K for additional tax information. Current and Deferred Income Taxes Tax Credit and Net Operating Loss Carryforwards Southern Company's federal PTC and ITC carryforwards begin expiring in 2031, but are expected to be fully utilized by 2027. The utilization of each Registrant's estimated tax credit and state net operating loss carryforwards and related valuation allowances could be impacted by numerous factors, including the acquisition of additional renewable projects, an increase in Georgia Power's ownership interest in Plant Vogtle Units 3 and 4, changes in taxable income projections, and potential income tax rate changes. See Note (B) and Note 2 to the financial statements in Item 8 of the Form 10-K under "Georgia Power – Nuclear Construction" for additional information on Plant Vogtle Units 3 and 4. Effective Tax Rate Southern Company's effective tax rate is typically lower than the statutory rate due to employee stock plans' dividend deduction, non-taxable AFUDC equity at the traditional electric operating companies, flowback of excess deferred income taxes at the regulated utilities, and federal income tax benefits from ITCs and PTCs primarily at Southern Power. Details of significant changes in the effective tax rate for the applicable Registrants are provided herein. Southern Company Southern Company's effective tax rate was 10.7% for the six months ended June 30, 2023 compared to 18.7% for the corresponding period in 2022. The effective tax rate decrease was primarily due to an increase in the flowback of certain excess deferred income taxes at Alabama Power in 2023, lower pre-tax earnings in 2023, and an adjustment related to state tax credit carryforwards and the related valuation allowance at Georgia Power in 2022 and 2023, partially offset by the flowback of certain excess deferred income taxes ending in 2022 at Georgia Power. Alabama Power Alabama Power's effective tax rate was 3.9% for the six months ended June 30, 2023 compared to 23.6% for the corresponding period in 2022. The effective tax rate decrease was primarily due to an increase in the flowback of certain excess deferred income taxes in 2023 and lower pre-tax earnings in 2023. See Note 2 to the financial statements under "Alabama Power – Excess Accumulated Deferred Income Tax Accounting Order" in Item 8 of the Form 10-K for additional information. Georgia Power Georgia Power's effective tax rate was 15.8% for the six months ended June 30, 2023 compared to 16.4% for the corresponding period in 2022. The effective tax rate decrease was primarily due to an adjustment related to state tax credit carryforwards in 2022, a decrease in a valuation allowance on certain state tax credit carryforwards in 2023, and lower pre-tax earnings in 2023, largely offset by the flowback of certain excess deferred income taxes ending in 2022. Mississippi Power Mississippi Power's effective tax rate was 15.2% for the six months ended June 30, 2023 compared to 18.8% for the corresponding period in 2022. The effective tax rate decrease was primarily due to an increase in the flowback of certain excess deferred income taxes in 2023. Southern Power Southern Power's effective tax benefit rate was (0.7)% for the six months ended June 30, 2023 compared to an effective tax rate of 11.2% for the corresponding period in 2022. The effective tax rate decrease was primarily due to changes in state apportionment methodology resulting from tax legislation enacted by the State of Tennessee in May 2023. Unrecognized Tax Benefits Southern Company's and Georgia Power's unrecognized tax positions balances at June 30, 2023 were $130 million and $48 million, respectively, compared to $80 million for Southern Company at December 31, 2022. The increases from prior periods are primarily related to the amendment of certain 2019 state tax filing positions related to tax credit utilization. If accepted by the state, these positions would decrease Southern Company's and Georgia Power's effective tax rates. The ultimate outcome of this unrecognized tax benefit is dependent on acceptance by the state and is expected to be resolved in the next 12 months.

Retirement Benefits

Retirement Benefits	6 Months Ended
Retirement Benefits	Jun. 30, 2023
Retirement Benefits [Abstract]
Retirement Benefits	RETIREMENT BENEFITS The Southern Company system has a qualified defined benefit, trusteed, pension plan covering substantially all employees, with the exception of employees at PowerSecure. The qualified pension plan is funded in accordance with requirements of the Employee Retirement Income Security Act of 1974, as amended (ERISA). No mandatory contributions to the qualified pension plan are anticipated for the year ending December 31, 2023. The Southern Company system also provides certain non-qualified defined benefits for a select group of management and highly compensated employees, which are funded on a cash basis. In addition, the Southern Company system provides certain medical care and life insurance benefits for retired employees through other postretirement benefit plans. The traditional electric operating companies fund other postretirement trusts to the extent required by their respective regulatory commissions. Southern Company Gas has a separate unfunded supplemental retirement health care plan that provides medical care and life insurance benefits to employees of discontinued businesses. See Note 11 to the financial statements in Item 8 of the Form 10-K for additional information. On each Registrant's condensed statements of income, the service cost component of net periodic benefit costs is included in other operations and maintenance expenses and all other components of net periodic benefit costs are included in other income (expense), net. Components of the net periodic benefit costs for the three and six months ended June 30, 2023 and 2022 are presented in the following tables. Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2023 Pension Plans Service cost $ 69 $ 16 $ 17 $ 3 $ 1 $ 6 Interest cost 157 36 47 7 2 11 Expected return on plan assets (308) (74) (96) (14) (4) (22) Amortization: Prior service costs — — 1 — — (1) Regulatory asset — — — — — 4 Net (gain) loss 8 3 3 — — (1) Net periodic pension income $ (74) $ (19) $ (28) $ (4) $ (1) $ (3) Postretirement Benefits Service cost $ 3 $ 1 $ 1 $ — $ — $ — Interest cost 17 4 7 1 — 2 Expected return on plan assets (20) (9) (8) — — (2) Amortization: Prior service costs 1 — — — — — Regulatory asset — — — — — 2 Net gain (3) — (1) — — (1) Net periodic postretirement benefit cost (income) $ (2) $ (4) $ (1) $ 1 $ — $ 1 Six Months Ended June 30, 2023 Pension Plans Service cost $ 138 $ 32 $ 34 $ 6 $ 3 $ 12 Interest cost 313 72 95 14 4 21 Expected return on plan assets (615) (148) (192) (28) (8) (44) Amortization: Prior service costs — — 1 — — (1) Regulatory asset — — — — — 8 Net (gain) loss 16 5 6 — — (2) Net periodic pension income $ (148) $ (39) $ (56) $ (8) $ (1) $ (6) Postretirement Benefits Service cost $ 7 $ 2 $ 2 $ — $ — $ — Interest cost 35 8 13 2 — 4 Expected return on plan assets (41) (17) (15) (1) — (3) Amortization: Prior service costs 1 — — — — — Regulatory asset — — — — — 3 Net gain (6) (1) (2) — — (2) Net periodic postretirement benefit cost (income) $ (4) $ (8) $ (2) $ 1 $ — $ 2 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2022 Pension Plans Service cost $ 103 $ 24 $ 26 $ 4 $ 3 $ 8 Interest cost 102 24 30 4 1 7 Expected return on plan assets (317) (75) (100) (14) (4) (24) Amortization: Prior service costs — — 1 — — — Regulatory asset — — — — — 4 Net loss 60 15 19 4 — 1 Net periodic pension income $ (52) $ (12) $ (24) $ (2) $ — $ (4) Postretirement Benefits Service cost $ 5 $ 2 $ 1 $ — $ — $ — Interest cost 11 2 3 1 — 1 Expected return on plan assets (20) (8) (6) (1) — (1) Amortization: Regulatory asset — — — — — 1 Net loss — — 1 — — — Net periodic postretirement benefit cost (income) $ (4) $ (4) $ (1) $ — $ — $ 1 Six Months Ended June 30, 2022 Pension Plans Service cost $ 206 $ 49 $ 52 $ 8 $ 5 $ 17 Interest cost 204 48 61 9 3 14 Expected return on plan assets (633) (152) (199) (29) (8) (46) Amortization: Prior service costs — — 1 — — (1) Regulatory asset — — — — — 8 Net loss 120 31 37 7 1 3 Net periodic pension cost (income) $ (103) $ (24) $ (48) $ (5) $ 1 $ (5) Postretirement Benefits Service cost $ 11 $ 3 $ 3 $ — $ — $ 1 Interest cost 21 5 7 1 — 2 Expected return on plan assets (40) (16) (13) (1) — (3) Amortization: Regulatory asset — — — — — 3 Net (gain) loss — — 1 — — (1) Net periodic postretirement benefit cost (income) $ (8) $ (8) $ (2) $ — $ — $ 2

Fair Value Measurements

Fair Value Measurements	6 Months Ended
Fair Value Measurements	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS At June 30, 2023, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows: Fair Value Measurements Using: At June 30, 2023 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 7 $ 86 $ — $ — $ 93 Interest rate derivatives — 4 — — 4 Investments in trusts: (b)(c) Domestic equity 718 205 — — 923 Foreign equity 140 167 — — 307 U.S. Treasury and government agency securities — 333 — — 333 Municipal bonds — 46 — — 46 Pooled funds – fixed income — 7 — — 7 Corporate bonds — 391 — — 391 Mortgage and asset backed securities — 90 — — 90 Private equity — — — 166 166 Cash and cash equivalents 2 — — — 2 Other 31 7 — 9 47 Cash equivalents 1,494 12 — — 1,506 Other investments 9 34 8 — 51 Total $ 2,401 $ 1,382 $ 8 $ 175 $ 3,966 Liabilities: Energy-related derivatives (a) $ 33 $ 278 $ — $ — $ 311 Interest rate derivatives — 304 — — 304 Foreign currency derivatives — 170 — — 170 Contingent consideration — — 12 — 12 Other — 13 — — 13 Total $ 33 $ 765 $ 12 $ — $ 810 Fair Value Measurements Using: At June 30, 2023 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 32 $ — $ — $ 32 Nuclear decommissioning trusts: (b) Domestic equity 420 198 — — 618 Foreign equity 140 — — — 140 U.S. Treasury and government agency securities — 20 — — 20 Municipal bonds — 1 — — 1 Corporate bonds — 221 — — 221 Mortgage and asset backed securities — 21 — — 21 Private equity — — — 166 166 Other 7 — — 9 16 Cash equivalents 110 12 — — 122 Other investments — 34 — — 34 Total $ 677 $ 539 $ — $ 175 $ 1,391 Liabilities: Energy-related derivatives $ — $ 84 $ — $ — $ 84 Georgia Power Assets: Energy-related derivatives $ — $ 17 $ — $ — $ 17 Nuclear decommissioning trusts: (b)(c) Domestic equity 298 1 — — 299 Foreign equity 166 — — 166 U.S. Treasury and government agency securities — 313 — — 313 Municipal bonds — 45 — — 45 Corporate bonds — 170 — — 170 Mortgage and asset backed securities — 69 — — 69 Other 24 7 — — 31 Total $ 322 $ 788 $ — $ — $ 1,110 Liabilities: Energy-related derivatives $ — $ 102 $ — $ — $ 102 Fair Value Measurements Using: At June 30, 2023 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 27 $ — $ — $ 27 Liabilities: Energy-related derivatives $ — $ 55 $ — $ — $ 55 Southern Power Assets: Energy-related derivatives $ — $ 4 $ — $ — $ 4 Cash equivalents 5 — — — 5 Total $ 5 $ 4 $ — $ — $ 9 Liabilities: Energy-related derivatives $ — $ 10 $ — $ — $ 10 Foreign currency derivatives — 28 — — 28 Contingent consideration — — 12 — 12 Other — 13 — — 13 Total $ — $ 51 $ 12 $ — $ 63 Southern Company Gas Assets: Energy-related derivatives (a) $ 7 $ 6 $ — $ — $ 13 Interest rate derivatives — 4 — — 4 Non-qualified deferred compensation trusts: Domestic equity — 6 — — 6 Foreign equity — 1 — — 1 Pooled funds – fixed income — 7 — — 7 Cash equivalents 2 — — — 2 Cash equivalents and restricted cash 215 — — — 215 Total $ 224 $ 24 $ — $ — $ 248 Liabilities: Energy-related derivatives (a) $ 33 $ 27 $ — $ — $ 60 Interest rate derivatives — 88 — — 88 Total $ 33 $ 115 $ — $ — $ 148 (a) Excludes cash collateral of $52 million. (b) Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 to the financial statements in Item 8 of the Form 10-K for additional information. (c) Includes investment securities pledged to creditors and collateral received and excludes payables related to the securities lending program. At June 30, 2023, approximately $25 million of the fair market value of Georgia Power's nuclear decommissioning trust funds' securities were on loan to creditors under the funds' managers' securities lending program. See Note 6 to the financial statements in Item 8 of the Form 10-K for additional information. Southern Company, Alabama Power, and Georgia Power continue to elect the option to fair value investment securities held in the nuclear decommissioning trust funds. The fair value of the funds, including reinvested interest and dividends and excluding the funds' expenses, increased (decreased) by the amounts shown in the table below for the three and six months ended June 30, 2023 and 2022. The changes were recorded as a change to the regulatory assets and liabilities related to AROs for Georgia Power and Alabama Power, respectively. Three Months Ended Six Months Ended Fair value increases (decreases) June 30, 2023 June 30, 2022 June 30, 2023 June 30, 2022 (in millions) Southern Company $ 132 $ (230) $ 228 $ (380) Alabama Power 58 (125) 103 (192) Georgia Power 74 (105) 125 (188) Valuation Methodologies The energy-related derivatives primarily consist of exchange-traded and over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard over-the-counter products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and occasionally, implied volatility of interest rate options. The fair value of cross-currency swaps reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future foreign currency exchange rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and discount rates. The interest rate derivatives and cross-currency swaps are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note (J) for additional information on how these derivatives are used. For fair value measurements of the investments within the nuclear decommissioning trusts and the non-qualified deferred compensation trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available. The NRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. See Note 6 to the financial statements under "Nuclear Decommissioning" in Item 8 of the Form 10-K for additional information. Southern Power has contingent payment obligations related to certain acquisitions whereby it is primarily obligated to make generation-based payments to the seller, which commenced at the commercial operation of the respective facility and continue through 2026. The obligations are categorized as Level 3 under Fair Value Measurements as the fair value is determined using significant unobservable inputs for the forecasted facility generation in MW-hours, as well as other inputs such as a fixed dollar amount per MW-hour, and a discount rate. The fair value of contingent consideration reflects the net present value of expected payments and any periodic change arising from forecasted generation is expected to be immaterial. Southern Power also has payment obligations through 2040 whereby it must reimburse the transmission owners for interconnection facilities and network upgrades constructed to support connection of a Southern Power generating facility to the transmission system. The obligations are categorized as Level 2 under Fair Value Measurements as the fair value is determined using observable inputs for the contracted amounts and reimbursement period, as well as a discount rate. The fair value of the obligations reflects the net present value of expected payments. "Other investments" primarily includes investments traded in the open market that have maturities greater than 90 days, which are categorized as Level 2 under Fair Value Measurements and are comprised of corporate bonds, bank certificates of deposit, treasury bonds, and/or agency bonds. At June 30, 2023, the fair value measurements of private market investments held in Alabama Power's nuclear decommissioning trusts that are calculated at net asset value per share (or its equivalent) as a practical expedient totaled $175 million and unfunded commitments related to the private market investments totaled $77 million. Private market investments include high-quality private equity funds across several market sectors, funds that invest in real estate assets, and a private credit fund. Private market funds do not have redemption rights. Distributions from these funds will be received as the underlying investments in the funds are liquidated. At June 30, 2023, other financial instruments for which the carrying amount did not equal fair value were as follows: Southern Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas () (in billions) Long-term debt, including securities due within one year: Carrying amount $ 58.9 $ 10.8 $ 16.5 $ 1.6 $ 3.0 $ 7.5 Fair value 53.5 9.5 15.0 1.4 2.8 6.6 () The long-term debt of Southern Company Gas is recorded at amortized cost, including the fair value adjustments at the effective date of the 2016 merger with Southern Company. Southern Company Gas amortizes the fair value adjustments over the remaining lives of the respective bonds, the latest being through 2043. The fair values are determined using Level 2 measurements and are based on quoted market prices for the same or similar issues or on the current rates available to the Registrants.

Derivatives

Derivatives	6 Months Ended
Derivatives	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	DERIVATIVESThe Registrants are exposed to market risks, including commodity price risk, interest rate risk, weather risk, and occasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, each company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to each company's policies in areas such as counterparty exposure and risk management practices. For the traditional electric operating companies, Southern Power, and Southern Company Gas' other businesses, each company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note (I) for additional fair value information. In the statements of cash flows, any cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities. Any cash impacts of settled foreign currency derivatives are classified as operating or financing activities to correspond with the classification of the hedged interest or principal, respectively. See Note 1 to the financial statements under "Financial Instruments" in Item 8 of the Form 10-K for additional information. Energy-Related Derivatives The Subsidiary Registrants enter into energy-related derivatives to hedge exposures to electricity, natural gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities have limited exposure to market volatility in energy-related commodity prices. Each of the traditional electric operating companies and certain of the natural gas distribution utilities of Southern Company Gas manage fuel-hedging programs, implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies, through the use of financial derivative contracts, which are expected to continue to mitigate price volatility. The traditional electric operating companies (with respect to wholesale generating capacity) and Southern Power have limited exposure to market volatility in energy-related commodity prices because their long-term sales contracts shift substantially all fuel cost responsibility to the purchaser. However, the traditional electric operating companies and Southern Power may be exposed to market volatility in energy-related commodity prices to the extent any uncontracted capacity is used to sell electricity. Southern Company Gas retains exposure to price changes that can, in a volatile energy market, be material and can adversely affect its results of operations. Southern Company Gas also enters into weather derivative contracts as economic hedges in the event of warmer-than-normal weather. Exchange-traded options are carried at fair value, with changes reflected in operating revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are reflected in operating revenues. Energy-related derivative contracts are accounted for under one of three methods: • Regulatory Hedges – Energy-related derivative contracts designated as regulatory hedges relate primarily to the traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through an approved cost recovery mechanism. • Cash Flow Hedges – Gains and losses on energy-related derivatives designated as cash flow hedges (which are mainly used to hedge anticipated purchases and sales) are initially deferred in accumulated OCI before being recognized in the statements of income in the same period and in the same income statement line item as the earnings effect of the hedged transactions. • Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred. Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric and natural gas industries. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered. At June 30, 2023, the net volume of energy-related derivative contracts for natural gas positions, together with the longest hedge date over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date for derivatives not designated as hedges, were as follows: Net Longest Longest (in millions) Southern Company () 422 2030 2028 Alabama Power 108 2026 2023 Georgia Power 109 2026 2023 Mississippi Power 85 2027 2023 Southern Power 10 2030 2024 Southern Company Gas () 110 2028 2028 () Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of 119.7 million mmBtu long natural gas positions and 9.4 million mmBtu short natural gas positions at June 30, 2023, which is also included in Southern Company's total volume. In addition to the volumes discussed above, the traditional electric operating companies and Southern Power enter into physical natural gas supply contracts that provide the option to sell back excess natural gas due to operational constraints. The maximum expected volume of natural gas subject to such a feature is 11 million mmBtu for Southern Company, which includes 3 million mmBtu for Alabama Power, 4 million mmBtu for Georgia Power, 1 million mmBtu for Mississippi Power, and 3 million mmBtu for Southern Power. For cash flow hedges of energy-related derivatives, the estimated pre-tax losses expected to be reclassified from accumulated OCI to earnings for the 12-month period ending June 30, 2024 are $33 million for Southern Company, $24 million for Southern Company Gas, and $9 million for Southern Power. Interest Rate Derivatives Southern Company and certain subsidiaries may enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and presented on the same income statement line item as the earnings effect of the hedged transactions. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item. Fair value gains or losses on derivatives that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred. At June 30, 2023, the following interest rate derivatives were outstanding: Notional Weighted Interest Hedge Fair Value Gain (Loss) at June 30, 2023 (in millions) (in millions) Cash Flow Hedges of Forecasted Debt Southern Company Gas $ 250 3.40% N/A August $ 4 Fair Value Hedges of Existing Debt Southern Company parent 400 1-month LIBOR + 0.68% 1.75% March 2028 (56) Southern Company parent 1,000 1-month LIBOR + 2.36% 3.70% April (160) Southern Company Gas 500 1-month LIBOR + 0.38% 1.75% January 2031 (88) Southern Company $ 2,150 $ (300) For cash flow hedges of interest rate derivatives, the estimated pre-tax gains (losses) expected to be reclassified from accumulated OCI to interest expense for the 12-month period ending June 30, 2024 are $(15) million for Southern Company and immaterial for the traditional electric operating companies and Southern Company Gas. Deferred gains and losses related to interest rate derivatives are expected to be amortized into earnings through 2052 for Southern Company, Alabama Power, and Georgia Power, 2028 for Mississippi Power, and 2046 for Southern Company Gas. Foreign Currency Derivatives Southern Company and certain subsidiaries, including Southern Power, may enter into foreign currency derivatives to hedge exposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Derivatives related to forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and on the same income statement line as the earnings effect of the hedged transactions, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Southern Company has elected to exclude the cross-currency basis spread from the assessment of effectiveness in the fair value hedges of its foreign currency risk and record any difference between the change in the fair value of the excluded components and the amounts recognized in earnings as a component of OCI. At June 30, 2023, the following foreign currency derivatives were outstanding: Pay Notional Pay Receive Notional Receive Hedge Fair Value Gain (Loss) at June 30, 2023 (in millions) (in millions) (in millions) Cash Flow Hedges of Existing Debt Southern Power $ 564 3.78% € 500 1.85% June 2026 $ (28) Fair Value Hedges of Existing Debt Southern Company parent 1,476 3.39% 1,250 1.88% September 2027 (142) Southern Company $ 2,040 € 1,750 $ (170) For cash flow hedges of foreign currency derivatives, the estimated pre-tax losses expected to be reclassified from accumulated OCI to earnings for the 12-month period ending June 30, 2024 are $11 million for Southern Power. Derivative Financial Statement Presentation and Amounts The Registrants enter into derivative contracts that may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Southern Company and certain subsidiaries also utilize master netting agreements to mitigate exposure to counterparty credit risk. These agreements may contain provisions that permit netting across product lines and against cash collateral. The fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties. The fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected in the balance sheets as follows: At June 30, 2023 At December 31, 2022 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Southern Company Energy-related derivatives designated as hedging instruments for regulatory purposes Assets from risk management activities/Liabilities from risk management activities $ 46 $ 166 $ 123 $ 121 Other deferred charges and assets/Other deferred credits and liabilities 36 101 52 44 Total derivatives designated as hedging instruments for regulatory purposes 82 267 175 165 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Assets from risk management activities/Liabilities from risk management activities 1 32 3 27 Other deferred charges and assets/Other deferred credits and liabilities 3 5 6 4 Interest rate derivatives: Assets from risk management activities/Liabilities from risk management activities 4 77 12 62 Other deferred charges and assets/Other deferred credits and liabilities — 227 — 240 Foreign currency derivatives: Assets from risk management activities/Liabilities from risk management activities — 35 — 34 Other deferred charges and assets/Other deferred credits and liabilities — 135 — 182 Total derivatives designated as hedging instruments in cash flow and fair value hedges 8 511 21 549 Energy-related derivatives not designated as hedging instruments Assets from risk management activities/Liabilities from risk management activities 7 7 13 13 Other deferred charges and assets/Other deferred credits and liabilities — — 2 1 Total derivatives not designated as hedging instruments 7 7 15 14 Gross amounts recognized 97 785 211 728 Gross amounts offset (a) (40) (92) (70) (111) Net amounts recognized in the Balance Sheets (b) $ 57 $ 693 $ 141 $ 617 At June 30, 2023 At December 31, 2022 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Alabama Power (c) Energy-related derivatives designated as hedging instruments for regulatory purposes Other current assets/Other current liabilities $ 20 $ 46 $ 42 $ 21 Other deferred charges and assets/Other deferred credits and liabilities 12 38 20 18 Total derivatives designated as hedging instruments for regulatory purposes 32 84 62 39 Gross amounts offset (20) (20) (24) (24) Net amounts recognized in the Balance Sheets $ 12 $ 64 $ 38 $ 15 Georgia Power Energy-related derivatives designated as hedging instruments for regulatory purposes Assets from risk management activities/Other current liabilities $ 7 $ 65 $ 36 $ 43 Other deferred charges and assets/Other deferred credits and liabilities 8 37 6 18 Total derivatives designated as hedging instruments for regulatory purposes 15 102 42 61 Energy-related derivatives not designated as hedging instruments Other current assets/Other current liabilities 2 — — 1 Gross amounts recognized 17 102 42 62 Gross amounts offset (12) (12) (21) (21) Net amounts recognized in the Balance Sheets $ 5 $ 90 $ 21 $ 41 Mississippi Power (c) Energy-related derivatives designated as hedging instruments for regulatory purposes Assets from risk management activities/Other current liabilities $ 11 $ 28 $ 33 $ 24 Other deferred charges and assets/Other deferred credits and liabilities 16 27 26 8 Total derivatives designated as hedging instruments for regulatory purposes 27 55 59 32 Gross amounts offset (19) (19) (17) (17) Net amounts recognized in the Balance Sheets $ 8 $ 36 $ 42 $ 15 At June 30, 2023 At December 31, 2022 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Southern Power Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Other current assets/Other current liabilities $ — $ 9 $ — $ 12 Other deferred charges and assets/Other deferred credits and liabilities 3 1 5 — Foreign currency derivatives: Other current assets/Other current liabilities — 11 — 11 Other deferred charges and assets/Other deferred credits and liabilities — 17 — 36 Total derivatives designated as hedging instruments in cash flow and fair value hedges 3 38 5 59 Energy-related derivatives not designated as hedging instruments Other current assets/Other current liabilities — — 2 — Other deferred charges and assets/Other deferred credits and liabilities 1 — 1 — Total derivatives not designated as hedging instruments 1 — 3 — Gross amounts recognized 4 38 8 59 Gross amounts offset (1) (1) — — Net amounts recognized in the Balance Sheets $ 3 $ 37 $ 8 $ 59 Southern Company Gas Energy-related derivatives designated as hedging instruments for regulatory purposes Other current assets/Other current liabilities $ 8 $ 27 $ 12 $ 33 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Other current assets/Other current liabilities 1 23 3 15 Other deferred charges and assets/Other deferred credits and liabilities — 4 1 4 Interest rate derivatives: Other current assets/Other current liabilities 4 19 — 14 Other deferred charges and assets/Other deferred credits and liabilities — 69 — 72 Total derivatives designated as hedging instruments in cash flow and fair value hedges 5 115 4 105 Energy-related derivatives not designated as hedging instruments Other current assets/Other current liabilities 4 6 11 12 Other deferred charges and assets/Other deferred credits and liabilities — — 1 1 Total derivatives not designated as hedging instruments 4 6 12 13 Gross amounts recognized 17 148 28 151 Gross amounts offset (a) 14 (38) — (41) Net amounts recognized in the Balance Sheets (b) $ 31 $ 110 $ 28 $ 110 (a) Gross amounts offset includes cash collateral held on deposit in broker margin accounts of $52 million and $41 million at June 30, 2023 and December 31, 2022, respectively. (b) Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives for both periods presented. (c) Energy-related derivatives not designated as hedging instruments were immaterial for Alabama Power and Mississippi Power for both periods presented. At June 30, 2023 and December 31, 2022, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivative instruments designated as regulatory hedging instruments and deferred were as follows: Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheet Derivative Category and Balance Sheet Southern Alabama Georgia Mississippi Southern Company Gas (in millions) At June 30, 2023: Energy-related derivatives: Other regulatory assets, current $ (141) $ (37) $ (60) $ (22) $ (22) Other regulatory assets, deferred (71) (27) (30) (14) — Other regulatory liabilities, current 29 11 2 4 12 Other regulatory liabilities, deferred 6 1 1 4 — Total energy-related derivative gains (losses) $ (177) $ (52) $ (87) $ (28) $ (10) At December 31, 2022: Energy-related derivatives: Other regulatory assets, current $ (71) $ (8) $ (26) $ (13) $ (24) Other regulatory assets, deferred (23) (7) (14) (2) — Other regulatory liabilities, current 72 29 19 22 2 Other regulatory liabilities, deferred 31 9 2 20 — Total energy-related derivative gains (losses) $ 9 $ 23 $ (19) $ 27 $ (22) For the three and six months ended June 30, 2023 and 2022, the pre-tax effects of cash flow and fair value hedge accounting on accumulated OCI for the applicable Registrants were as follows: Gain (Loss) Recognized in OCI on Derivatives For the Three Months Ended June 30, For the Six Months Ended June 30, 2023 2022 2023 2022 (in millions) (in millions) Southern Company Cash flow hedges: Energy-related derivatives $ (5) $ (1) $ (50) $ 41 Interest rate derivatives 3 21 (10) 30 Foreign currency derivatives 8 (74) 9 (102) Fair value hedges () : Foreign currency derivatives 30 (7) 1 (3) Total $ 36 $ (61) $ (50) $ (34) Georgia Power Cash flow hedges: Interest rate derivatives $ (1) $ 19 $ (3) $ 31 Southern Power Cash flow hedges: Energy-related derivatives $ (2) $ 2 $ (13) $ 7 Foreign currency derivatives 8 (74) 9 (102) Total $ 6 $ (72) $ (4) $ (95) Southern Company Gas Cash flow hedges: Energy-related derivatives $ (3) $ (2) $ (37) $ 35 Interest rate derivatives 3 (5) 4 (5) Total $ — $ (7) $ (33) $ 30 () Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI. For the three and six months ended June 30, 2023 and 2022, the pre-tax effects of energy-related derivatives designated as cash flow hedging instruments on accumulated OCI were immaterial for Alabama Power and Mississippi Power. For the three and six months ended June 30, 2023 and 2022, the pre-tax effects of cash flow and fair value hedge accounting on income were as follows: Location and Amount of Gain (Loss) Recognized in Income on Cash Flow and Fair Value Hedging Relationships For the Three Months Ended June 30, For the Six Months Ended June 30, 2023 2022 2023 2022 (in millions) (in millions) Southern Company Total cost of natural gas $ 199 $ 452 $ 1,097 $ 1,546 Gain (loss) on energy-related cash flow hedges (a) (9) 10 (29) 18 Total depreciation and amortization 1,112 913 2,222 1,805 Gain (loss) on energy-related cash flow hedges (a) (4) 4 (13) 6 Total interest expense, net of amounts capitalized (610) (488) (1,192) (950) Gain (loss) on interest rate cash flow hedges (a) (5) (6) (9) (13) Gain (loss) on foreign currency cash flow hedges (a) (2) (7) (5) (13) Gain (loss) on interest rate fair value hedges (b) (45) (76) (3) (198) Total other income (expense), net 142 139 286 283 Gain (loss) on foreign currency cash flow hedges (a)(c) — (73) 10 (97) Gain (loss) on foreign currency fair value hedges 29 (96) 26 (121) Amount excluded from effectiveness testing recognized in earnings (29) 7 (1) 3 Southern Power Total depreciation and amortization $ 122 $ 131 $ 250 $ 251 Gain (loss) on energy-related cash flow hedges (a) (4) 4 (13) 6 Total interest expense, net of amounts capitalized (33) (36) (66) (73) Gain (loss) on foreign currency cash flow hedges (a) (2) (7) (5) (13) Total other income (expense), net 2 1 4 3 Gain (loss) on foreign currency cash flow hedges (a)(c) — (73) 10 (97) Southern Company Gas Total cost of natural gas $ 199 $ 452 $ 1,097 $ 1,546 Gain (loss) on energy-related cash flow hedges (a) (9) 10 (29) 18 Total interest expense, net of amounts capitalized (73) (61) (150) (122) Gain (loss) on interest rate cash flow hedges (a) — (1) (1) (1) Gain (loss) on interest rate fair value hedges (b) (15) (22) (2) (57) (a) Reclassified from accumulated OCI into earnings. (b) For fair value hedges, changes in the fair value of the derivative contracts are generally equal to changes in the fair value of the underlying debt and have no material impact on income. (c) The reclassification from accumulated OCI into other income (expense), net completely offsets currency gains and losses arising from changes in the U.S. currency exchange rates used to record the euro-denominated notes. The pre-tax effects of cash flow and fair value hedge accounting on income for energy-related derivatives and interest rate derivatives were immaterial for the traditional electric operating companies for all periods presented. At June 30, 2023 and December 31, 2022, the following amounts were recorded on the balance sheets related to cumulative basis adjustments for fair value hedges: Carrying Amount of the Hedged Item Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item Balance Sheet Location of Hedged Items At June 30, 2023 At December 31, 2022 At June 30, 2023 At December 31, 2022 (in millions) (in millions) Southern Company Long-term debt $ (2,970) $ (2,927) $ 265 $ 282 Southern Company Gas Long-term debt $ (417) $ (415) $ 80 $ 81 For the three and six months ended June 30, 2023 and 2022, the pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income of Southern Company and Southern Company Gas were as follows: Gain (Loss) Three Months Ended June 30, Six Months Ended June 30, Derivatives in Non-Designated Hedging Relationships Statements of Income Location 2023 2022 2023 2022 (in millions) (in millions) Energy-related derivatives: Natural gas revenues () $ — $ (15) $ — $ (13) Cost of natural gas 16 (25) 29 (5) Total derivatives in non-designated hedging relationships $ 16 $ (40) $ 29 $ (18) (*) Excludes $14 million of gains for the six months ended June 30, 2023, and immaterial amounts for all other periods presented, recorded in natural gas revenues associated with weather derivatives. For the three and six months ended June 30, 2023 and 2022, the pre-tax effects of energy-related derivatives not designated as hedging instruments were immaterial for the other Registrants. Contingent Features The Registrants do not have any credit arrangements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. There are certain derivatives that could require collateral, but not accelerated payment, in the event of various credit rating changes of certain Southern Company subsidiaries. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. At June 30, 2023, the Registrants had no collateral posted with derivative counterparties to satisfy these arrangements. For Southern Company and Southern Power, the fair value of interest rate derivative liabilities with contingent features and the maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were $65 million and $13 million, respectively, at June 30, 2023. For the traditional electric operating companies and Southern Power, energy-related derivative liabilities with contingent features and the maximum potential collateral requirements arising from the credit-risk-related contingent features, at a rating below BBB- and/or Baa3, were immaterial at June 30, 2023. The maximum potential collateral requirements arising from the credit-risk-related contingent features for the traditional electric operating companies and Southern Power include certain agreements that could require collateral in the event that one or more Southern Company power pool participants has a credit rating change to below investment grade. Alabama Power and Southern Power maintain accounts with certain regional transmission organizations to facilitate financial derivative transactions and they may be required to post collateral based on the value of the positions in these accounts and the associated margin requirements. At June 30, 2023, cash collateral posted in these accounts was $15 million for Southern Power and immaterial for Alabama Power. Southern Company Gas maintains accounts with brokers or the clearing houses of certain exchanges to facilitate financial derivative transactions. Based on the value of the positions in these accounts and the associated margin requirements, Southern Company Gas may be required to deposit cash into these accounts. At June 30, 2023, cash collateral held on deposit in broker margin accounts was $52 million. The Registrants are exposed to losses related to financial instruments in the event of counterparties' nonperformance. The Registrants only enter into agreements and material transactions with counterparties that have investment grade credit ratings by Moody's and S&P or with counterparties who have posted collateral to cover potential credit exposure. The Registrants have also established risk management policies and controls to determine and monitor the creditworthiness of counterparties in order to mitigate their exposure to counterparty credit risk. Southern Company Gas uses established credit policies to determine and monitor the creditworthiness of counterparties, including requirements to post collateral or other credit security, as well as the quality of pledged collateral. Collateral or credit security is most often in the form of cash or letters of credit from an investment-grade financial institution, but may also include cash or U.S. government securities held by a trustee. Prior to entering a physical transaction, Southern Company Gas assigns its counterparties an internal credit rating and credit limit based on the counterparties' Moody's, S&P, and Fitch ratings, commercially available credit reports, and audited financial statements. Southern Company Gas may require counterparties to pledge additional collateral when deemed necessary. Southern Company Gas utilizes netting agreements whenever possible to mitigate exposure to counterparty credit risk. Netting agreements enable Southern Company Gas to net certain assets and liabilities by counterparty across product lines and against cash collateral, provided the netting and cash collateral agreements include such provisions. While the amounts due from, or owed to, counterparties are settled net, they are recorded on a gross basis on the balance sheet as energy marketing receivables and energy marketing payables. The Registrants do not anticipate a material adverse effect on their respective financial statements as a result of counterparty nonperformance.

Segment and Related Information

Segment and Related Information	6 Months Ended
Segment and Related Information	Jun. 30, 2023
Segment Reporting [Abstract]
Segment and Related Information	SEGMENT AND RELATED INFORMATION Southern Company The primary businesses of the Southern Company system are electricity sales by the traditional electric operating companies and Southern Power and the distribution of natural gas by Southern Company Gas. The traditional electric operating companies are vertically integrated utilities providing electric service in three Southeastern states. Southern Power develops, constructs, acquires, owns, and manages power generation assets, including renewable energy and battery energy storage projects, and sells electricity at market-based rates in the wholesale market. Southern Company Gas distributes natural gas through its natural gas distribution utilities and is involved in several other complementary businesses including gas pipeline investments and gas marketing services. Southern Company's reportable business segments are the sale of electricity by the traditional electric operating companies, the sale of electricity in the competitive wholesale market by Southern Power, and the sale of natural gas and other complementary products and services by Southern Company Gas. Revenues from sales by Southern Power to the traditional electric operating companies were $116 million and $251 million for the three and six months ended June 30, 2023, respectively, and $232 million and $337 million for the three and six months ended June 30, 2022, respectively. Revenues from sales of natural gas from Southern Company Gas to the traditional electric operating companies and Southern Power were immaterial for all periods presented. The "All Other" column includes the Southern Company parent entity, which does not allocate operating expenses to business segments. Also, this category includes segments below the quantitative threshold for separate disclosure. These segments include providing distributed energy and resilience solutions and deploying microgrids for commercial, industrial, governmental, and utility customers, as well as investments in telecommunications. All other inter-segment revenues are not material. Financial data for business segments and products and services for the three and six months ended June 30, 2023 and 2022 was as follows: Electric Utilities Traditional Southern Eliminations Total Southern Company Gas All Eliminations Consolidated (in millions) Three Months Ended June 30, 2023 Operating revenues $ 4,359 $ 525 $ (120) $ 4,764 $ 852 $ 180 $ (48) $ 5,748 Segment net income (loss) (a)(b) 823 85 — 908 85 (157) 2 838 Six Months Ended June 30, 2023 Operating revenues $ 8,472 $ 1,033 $ (258) $ 9,247 $ 2,728 $ 346 $ (93) $ 12,228 Segment net income (loss) (a)(b)(c) 1,433 187 — 1,620 393 (311) (2) 1,700 At June 30, 2023 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 144 $ — $ 5,161 Total assets 97,751 13,046 (589) 110,208 24,331 3,523 (946) 137,116 Three Months Ended June 30, 2022 Operating revenues $ 5,563 $ 899 $ (456) $ 6,006 $ 1,083 $ 159 $ (42) $ 7,206 Segment net income (loss) (a)(d) 1,036 98 — 1,134 115 (137) (5) 1,107 Six Months Ended June 30, 2022 Operating revenues $ 9,778 $ 1,438 $ (700) $ 10,516 $ 3,140 $ 283 $ (85) $ 13,854 Segment net income (loss) (a)(d) 1,811 170 — 1,981 433 (263) (12) 2,139 At December 31, 2022 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 144 $ — $ 5,161 Total assets 95,861 13,081 (659) 108,283 24,621 2,665 (678) 134,891 (a) Attributable to Southern Company. (b) For Southern Company Gas, includes a pre-tax charge of approximately $38 million ($28 million after tax) associated with the disallowance of certain capital expenditures at Nicor Gas. See Note (B) under "Southern Company Gas" for additional information. (c) For Southern Power, includes a $16 million pre-tax gain ($12 million after tax) on the sale of spare parts. (d) For the traditional electric operating companies, includes pre-tax charges of $52 million ($39 million after tax) at Georgia Power for the estimated probable loss associated with the construction of Plant Vogtle Units 3 and 4. See Note (B) and Note 2 to the financial statements in Item 8 of the Form 10-K under "Georgia Power – Nuclear Construction" for additional information. Products and Services Electric Utilities' Revenues Retail Wholesale Other Total (in millions) Three Months Ended June 30, 2023 $ 3,859 $ 605 $ 300 $ 4,764 Three Months Ended June 30, 2022 4,789 937 280 6,006 Six Months Ended June 30, 2023 $ 7,458 $ 1,203 $ 586 $ 9,247 Six Months Ended June 30, 2022 8,402 1,601 513 10,516 Southern Company Gas' Revenues Gas Gas Other Total (in millions) Three Months Ended June 30, 2023 $ 761 $ 75 $ 16 $ 852 Three Months Ended June 30, 2022 975 92 16 1,083 Six Months Ended June 30, 2023 $ 2,372 $ 320 $ 36 $ 2,728 Six Months Ended June 30, 2022 2,765 335 40 3,140 Southern Company Gas Southern Company Gas manages its business through three reportable segments – gas distribution operations, gas pipeline investments, and gas marketing services. The non-reportable segments are combined and presented as all other. Gas distribution operations is the largest component of Southern Company Gas' business and includes natural gas local distribution utilities that construct, manage, and maintain intrastate natural gas pipelines and gas distribution facilities in four states. Gas pipeline investments consists of joint ventures in natural gas pipeline investments including a 50% interest in SNG and a 50% joint ownership interest in the Dalton Pipeline. These natural gas pipelines enable the provision of diverse sources of natural gas supplies to the customers of Southern Company Gas. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information. Gas marketing services provides natural gas marketing to end-use customers primarily in Georgia and Illinois through SouthStar. The all other column includes segments and subsidiaries that fall below the quantitative threshold for separate disclosure, including storage and fuels operations. The all other column included a natural gas storage facility in Texas through its sale in November 2022. See Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information, including the sale of a natural gas storage facility in California expected to be complet ed later in 2023. Business segment financial data for the three months ended June 30, 2023 and 2022 was as follows: Gas Distribution Operations Gas Gas Marketing Services Total All Other Eliminations Consolidated (in millions) Three Months Ended June 30, 2023 Operating revenues $ 764 $ 8 $ 75 $ 847 $ 9 $ (4) $ 852 Segment net income (loss) () 60 19 7 86 (1) — 85 Six Months Ended June 30, 2023 Operating revenues $ 2,383 $ 16 $ 320 $ 2,719 $ 22 $ (13) $ 2,728 Segment net income () 281 50 56 387 6 — 393 Total assets at June 30, 2023 22,366 1,552 1,542 25,460 9,606 (10,735) 24,331 Three Months Ended June 30, 2022 Operating revenues $ 980 $ 8 $ 92 $ 1,080 $ 10 $ (7) $ 1,083 Segment net income (loss) 92 23 1 116 (1) — 115 Six Months Ended June 30, 2022 Operating revenues $ 2,782 $ 16 $ 335 $ 3,133 $ 26 $ (19) $ 3,140 Segment net income 306 52 67 425 8 — 433 Total assets at December 31, 2022 22,040 1,577 1,616 25,233 8,943 (9,555) 24,621 (*) For gas distribution operations, includes a pre-tax charge of approximately $38 million ($28 million after tax) associated with the disallowance of certain capital expenditures at Nicor Gas. See Note (B) under "Southern Company Gas" for additional information.

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	6 Months Ended
Insider Trading Arrangements	Jun. 30, 2023 shares	Jun. 30, 2023 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Officer Trading Arrangement [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		The following table reports information regarding the adoption, modification, or termination of "Rule 10b5-1 trading arrangements" or "non-Rule 10b5-1 trading arrangements," as defined in Item 408(a) of Regulation S-K, during the three months ended June 30, 2023 for Southern Company's directors and "officers," as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended. There were no modifications or terminations of such trading arrangements during the three months ended June 30, 2023. Unless otherwise indicated, each trading arrangement listed below is a "Rule 10b5-1 trading arrangement," provides for the sale of shares of Southern Company's common stock, commences no earlier than the 120 th day after the "Date of Adoption" listed below, and terminates upon the earlier of the "Expiration Date" listed below or the completion of all sales. The Subsidiary Registrants had no reportable trading arrangements for the three months ended June 30, 2023. Name Title Date of Adoption Expiration Aggregate Number of Shares Covered Christopher Cummiskey Executive Vice President May 4, 2023 August 29, 2024 22,064 (1) Anthony L. Wilson Chairman, President, and Chief Executive Officer of Mississippi Power May 8, 2023 August 30, 2024 1,360 (2) (1) Includes shares underlying equity awards subject to performance conditions and accrual of dividend-equivalent rights. Accordingly, the total number of shares ultimately available for sale could be more or less than the amount shown. The amount shown is based on the target number of shares subject to equity awards and the dividend-equivalent rights accrued as of the date of adoption. (2) Shares to be donated to a charitable organization.
Officer Trading Arrangement [Member] \| Christopher Cummiskey [Member]
Trading Arrangements, by Individual
Name	Christopher Cummiskey
Title	Executive Vice President
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	May 4, 2023
Aggregate Available	22,064	22,064
Officer Trading Arrangement [Member] \| Anthony L. Wilson [Member]
Trading Arrangements, by Individual
Name	Anthony L. Wilson
Title	Chairman, President, and Chief Executive Officer of Mississippi Power
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	May 8, 2023
Aggregate Available	1,360	1,360

Introduction (Policies)

Introduction (Policies)	6 Months Ended
Introduction (Policies)	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting	The condensed quarterly financial statements of each Registrant included herein have been prepared by such Registrant, without audit, pursuant to the rules and regulations of the SEC. The Condensed Balance Sheets at December 31, 2022 have been derived from the audited financial statements of each Registrant. In the opinion of each Registrant's management, the information regarding such Registrant furnished herein reflects all adjustments, which, except as otherwise disclosed, are of a normal recurring nature, necessary to present fairly the results of operations for the periods ended June 30, 2023 and 2022. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations, although each Registrant believes that the disclosures regarding such Registrant are adequate to make the information presented not misleading. Disclosures which would substantially duplicate the disclosures in the Form 10-K and details which have not changed significantly in amount or composition since the filing of the Form 10-K are generally omitted from this Quarterly Report on Form 10-Q unless specifically required by GAAP. Therefore, these Condensed Financial Statements should be read in conjunction with the financial statements and the notes thereto included in the Form 10-K. Due to the seasonal variations in the demand for energy and other factors, operating results for the periods presented are not necessarily indicative of the operating results to be expected for the full year.
Reclassifications	Certain prior year data presented in the financial statements have been reclassified to conform to the current year presentation. These reclassifications had no impact on the overall results of operations, financial position, or cash flows of any Registrant.
Goodwill	Goodwill is not amortized, but is subject to an annual impairment test during the fourth quarter of each year, or more frequently if goodwill impairment indicators arise.
Natural Gas for Sale	Natural Gas for Sale With the exception of Nicor Gas, Southern Company Gas records natural gas inventories on a WACOG basis. For any declines in market prices below the WACOG considered to be other than temporary, an adjustment is recorded to reduce the value of natural gas inventories to market value. Nicor Gas' natural gas inventory is carried at cost on a LIFO basis. Inventory decrements occurring during the year that are restored prior to year-end are charged to cost of natural gas at the estimated annual replacement cost. Inventory decrements that are not restored prior to year-end are charged to cost of natural gas at the actual LIFO cost of the inventory layers liquidated.
Valuation Methodologies	Valuation Methodologies The energy-related derivatives primarily consist of exchange-traded and over-the-counter financial products for natural gas and physical power products, including, from time to time, basis swaps. These are standard products used within the energy industry and are valued using the market approach. The inputs used are mainly from observable market sources, such as forward natural gas prices, power prices, implied volatility, and overnight index swap interest rates. Interest rate derivatives are also standard over-the-counter products that are valued using observable market data and assumptions commonly used by market participants. The fair value of interest rate derivatives reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future interest rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and occasionally, implied volatility of interest rate options. The fair value of cross-currency swaps reflects the net present value of expected payments and receipts under the swap agreement based on the market's expectation of future foreign currency exchange rates. Additional inputs to the net present value calculation may include the contract terms, counterparty credit risk, and discount rates. The interest rate derivatives and cross-currency swaps are categorized as Level 2 under Fair Value Measurements as these inputs are based on observable data and valuations of similar instruments. See Note (J) for additional information on how these derivatives are used. For fair value measurements of the investments within the nuclear decommissioning trusts and the non-qualified deferred compensation trusts, external pricing vendors are designated for each asset class with each security specifically assigned a primary pricing source. For investments held within commingled funds, fair value is determined at the end of each business day through the net asset value, which is established by obtaining the underlying securities' individual prices from the primary pricing source. A market price secured from the primary source vendor is then evaluated by management in its valuation of the assets within the trusts. As a general approach, fixed income market pricing vendors gather market data (including indices and market research reports) and integrate relative credit information, observed market movements, and sector news into proprietary pricing models, pricing systems, and mathematical tools. Dealer quotes and other market information, including live trading levels and pricing analysts' judgments, are also obtained when available. The NRC requires licensees of commissioned nuclear power reactors to establish a plan for providing reasonable assurance of funds for future decommissioning. See Note 6 to the financial statements under "Nuclear Decommissioning" in Item 8 of the Form 10-K for additional information. Southern Power has contingent payment obligations related to certain acquisitions whereby it is primarily obligated to make generation-based payments to the seller, which commenced at the commercial operation of the respective facility and continue through 2026. The obligations are categorized as Level 3 under Fair Value Measurements as the fair value is determined using significant unobservable inputs for the forecasted facility generation in MW-hours, as well as other inputs such as a fixed dollar amount per MW-hour, and a discount rate. The fair value of contingent consideration reflects the net present value of expected payments and any periodic change arising from forecasted generation is expected to be immaterial.
Derivatives	The Registrants are exposed to market risks, including commodity price risk, interest rate risk, weather risk, and occasionally foreign currency exchange rate risk. To manage the volatility attributable to these exposures, each company nets its exposures, where possible, to take advantage of natural offsets and enters into various derivative transactions for the remaining exposures pursuant to each company's policies in areas such as counterparty exposure and risk management practices. For the traditional electric operating companies, Southern Power, and Southern Company Gas' other businesses, each company's policy is that derivatives are to be used primarily for hedging purposes and mandates strict adherence to all applicable risk management policies. Derivative positions are monitored using techniques including, but not limited to, market valuation, value at risk, stress testing, and sensitivity analysis. Derivative instruments are recognized at fair value in the balance sheets as either assets or liabilities and are presented on a net basis. See Note (I) for additional fair value information. In the statements of cash flows, any cash impacts of settled energy-related and interest rate derivatives are recorded as operating activities. Any cash impacts of settled foreign currency derivatives are classified as operating or financing activities to correspond with the classification of the hedged interest or principal, respectively. See Note 1 to the financial statements under "Financial Instruments" in Item 8 of the Form 10-K for additional information. Energy-Related Derivatives The Subsidiary Registrants enter into energy-related derivatives to hedge exposures to electricity, natural gas, and other fuel price changes. However, due to cost-based rate regulations and other various cost recovery mechanisms, the traditional electric operating companies and the natural gas distribution utilities have limited exposure to market volatility in energy-related commodity prices. Each of the traditional electric operating companies and certain of the natural gas distribution utilities of Southern Company Gas manage fuel-hedging programs, implemented per the guidelines of their respective state PSCs or other applicable state regulatory agencies, through the use of financial derivative contracts, which are expected to continue to mitigate price volatility. The traditional electric operating companies (with respect to wholesale generating capacity) and Southern Power have limited exposure to market volatility in energy-related commodity prices because their long-term sales contracts shift substantially all fuel cost responsibility to the purchaser. However, the traditional electric operating companies and Southern Power may be exposed to market volatility in energy-related commodity prices to the extent any uncontracted capacity is used to sell electricity. Southern Company Gas retains exposure to price changes that can, in a volatile energy market, be material and can adversely affect its results of operations. Southern Company Gas also enters into weather derivative contracts as economic hedges in the event of warmer-than-normal weather. Exchange-traded options are carried at fair value, with changes reflected in operating revenues. Non-exchange-traded options are accounted for using the intrinsic value method. Changes in the intrinsic value for non-exchange-traded contracts are reflected in operating revenues. Energy-related derivative contracts are accounted for under one of three methods: • Regulatory Hedges – Energy-related derivative contracts designated as regulatory hedges relate primarily to the traditional electric operating companies' and the natural gas distribution utilities' fuel-hedging programs, where gains and losses are initially recorded as regulatory liabilities and assets, respectively, and then are included in fuel expense as the underlying fuel is used in operations and ultimately recovered through an approved cost recovery mechanism. • Cash Flow Hedges – Gains and losses on energy-related derivatives designated as cash flow hedges (which are mainly used to hedge anticipated purchases and sales) are initially deferred in accumulated OCI before being recognized in the statements of income in the same period and in the same income statement line item as the earnings effect of the hedged transactions. • Not Designated – Gains and losses on energy-related derivative contracts that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred. Some energy-related derivative contracts require physical delivery as opposed to financial settlement, and this type of derivative is both common and prevalent within the electric and natural gas industries. When an energy-related derivative contract is settled physically, any cumulative unrealized gain or loss is reversed and the contract price is recognized in the respective line item representing the actual price of the underlying goods being delivered. Interest Rate Derivatives Southern Company and certain subsidiaries may enter into interest rate derivatives to hedge exposure to changes in interest rates. Derivatives related to existing variable rate securities or forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and presented on the same income statement line item as the earnings effect of the hedged transactions. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item. Fair value gains or losses on derivatives that are not designated or fail to qualify as hedges are recognized in the statements of income as incurred. Foreign Currency Derivatives Southern Company and certain subsidiaries, including Southern Power, may enter into foreign currency derivatives to hedge exposure to changes in foreign currency exchange rates, such as that arising from the issuance of debt denominated in a currency other than U.S. dollars. Derivatives related to forecasted transactions are accounted for as cash flow hedges where the derivatives' fair value gains or losses are recorded in OCI and are reclassified into earnings at the same time and on the same income statement line as the earnings effect of the hedged transactions, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Derivatives related to existing fixed rate securities are accounted for as fair value hedges, where the derivatives' fair value gains or losses and hedged items' fair value gains or losses are both recorded directly to earnings on the same income statement line item, including foreign currency gains or losses arising from changes in the U.S. currency exchange rates. Southern Company has elected to exclude the cross-currency basis spread from the assessment of effectiveness in the fair value hedges of its foreign currency risk and record any difference between the change in the fair value of the excluded components and the amounts recognized in earnings as a component of OCI. Derivative Financial Statement Presentation and Amounts The Registrants enter into derivative contracts that may contain certain provisions that permit intra-contract netting of derivative receivables and payables for routine billing and offsets related to events of default and settlements. Southern Company and certain subsidiaries also utilize master netting agreements to mitigate exposure to counterparty credit risk. These agreements may contain provisions that permit netting across product lines and against cash collateral. The fair value amounts of derivative assets and liabilities on the balance sheets are presented net to the extent that there are netting arrangements or similar agreements with the counterparties.

Introduction (Tables)

Introduction (Tables)	6 Months Ended
Introduction (Tables)	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Goodwill	Goodwill at June 30, 2023 and December 31, 2022 was as follows: Goodwill (in millions) Southern Company $ 5,161 Southern Company Gas: Gas distribution operations $ 4,034 Gas marketing services 981 Southern Company Gas total $ 5,015
Schedule of Other Intangible Assets, Indefinite-Lived	Other intangible assets were as follows: At June 30, 2023 At December 31, 2022 Gross Carrying Amount Accumulated Amortization Other Gross Carrying Amount Accumulated Amortization Other (in millions) (in millions) Southern Company Subject to amortization: Customer relationships $ 212 $ (167) $ 45 $ 212 $ (162) $ 50 Trade names 64 (49) 15 64 (44) 20 PPA fair value adjustments 390 (139) 251 390 (129) 261 Other 3 (3) — 5 (5) — Total subject to amortization $ 669 $ (358) $ 311 $ 671 $ (340) $ 331 Not subject to amortization: FCC licenses 75 — 75 75 — 75 Total other intangible assets $ 744 $ (358) $ 386 $ 746 $ (340) $ 406 Southern Power () PPA fair value adjustments $ 390 $ (139) $ 251 $ 390 $ (129) $ 261 Southern Company Gas () Gas marketing services Customer relationships $ 156 $ (142) $ 14 $ 156 $ (139) $ 17 Trade names 26 (19) 7 26 (17) 9 Total other intangible assets $ 182 $ (161) $ 21 $ 182 $ (156) $ 26 (*) All subject to amortization.
Schedule of Other Intangible Assets, Finite-Lived	Other intangible assets were as follows: At June 30, 2023 At December 31, 2022 Gross Carrying Amount Accumulated Amortization Other Gross Carrying Amount Accumulated Amortization Other (in millions) (in millions) Southern Company Subject to amortization: Customer relationships $ 212 $ (167) $ 45 $ 212 $ (162) $ 50 Trade names 64 (49) 15 64 (44) 20 PPA fair value adjustments 390 (139) 251 390 (129) 261 Other 3 (3) — 5 (5) — Total subject to amortization $ 669 $ (358) $ 311 $ 671 $ (340) $ 331 Not subject to amortization: FCC licenses 75 — 75 75 — 75 Total other intangible assets $ 744 $ (358) $ 386 $ 746 $ (340) $ 406 Southern Power () PPA fair value adjustments $ 390 $ (139) $ 251 $ 390 $ (129) $ 261 Southern Company Gas () Gas marketing services Customer relationships $ 156 $ (142) $ 14 $ 156 $ (139) $ 17 Trade names 26 (19) 7 26 (17) 9 Total other intangible assets $ 182 $ (161) $ 21 $ 182 $ (156) $ 26 (*) All subject to amortization.
Schedule of Amortization of Other Intangible Assets	Amortization associated with other intangible assets was as follows: Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30, 2023 June 30, 2022 (in millions) Southern Company (a) $ 9 $ 18 $ 9 $ 19 Southern Power (b) 5 10 5 10 Southern Company Gas 2 5 2 5 (a) Includes $5 million, $10 million, $5 million, and $10 million for the three and six months ended June 30, 2023 and 2022, respectively, recorded as a reduction to operating revenues. (b) Recorded as a reduction to operating revenues.
Schedule of Restrictions on Cash and Cash Equivalents	The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed balance sheets that total to the amount shown in the condensed statements of cash flows for the applicable Registrants: Southern Company Georgia Power Southern Power Southern (in millions) At June 30, 2023 Cash and cash equivalents $ 2,123 $ 44 $ 169 $ 242 Restricted cash (a) : Other current assets 83 80 — 3 Other deferred charges and assets 39 36 3 — Total cash, cash equivalents, and restricted cash (b) $ 2,244 $ 160 $ 172 $ 244 At December 31, 2022 Cash and cash equivalents $ 1,917 $ 364 $ 131 $ 81 Restricted cash (a) : Other current assets 62 60 — 2 Other deferred charges and assets 58 56 3 — Total cash, cash equivalents, and restricted cash (b) $ 2,037 $ 480 $ 133 $ 83 (a) For Georgia Power, reflects $116 million at both June 30, 2023 and December 31, 2022 related to proceeds from the issuance of solid waste disposal facility revenue bonds in 2022. For Southern Power, reflects $3 million at both June 30, 2023 and December 31, 2022 held to fund estimated construction completion costs at the Deuel Harvest wind facility. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance. (b) Total may not add due to rounding.
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the condensed balance sheets that total to the amount shown in the condensed statements of cash flows for the applicable Registrants: Southern Company Georgia Power Southern Power Southern (in millions) At June 30, 2023 Cash and cash equivalents $ 2,123 $ 44 $ 169 $ 242 Restricted cash (a) : Other current assets 83 80 — 3 Other deferred charges and assets 39 36 3 — Total cash, cash equivalents, and restricted cash (b) $ 2,244 $ 160 $ 172 $ 244 At December 31, 2022 Cash and cash equivalents $ 1,917 $ 364 $ 131 $ 81 Restricted cash (a) : Other current assets 62 60 — 2 Other deferred charges and assets 58 56 3 — Total cash, cash equivalents, and restricted cash (b) $ 2,037 $ 480 $ 133 $ 83 (a) For Georgia Power, reflects $116 million at both June 30, 2023 and December 31, 2022 related to proceeds from the issuance of solid waste disposal facility revenue bonds in 2022. For Southern Power, reflects $3 million at both June 30, 2023 and December 31, 2022 held to fund estimated construction completion costs at the Deuel Harvest wind facility. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance. (b) Total may not add due to rounding.
Schedule of Storm Damage Reserve Activity	Storm damage reserve activity for the traditional electric operating companies during the six months ended June 30, 2023 was as follows: Southern Alabama Power Georgia Power Mississippi (in millions) Balance at December 31, 2022 $ 216 $ 97 $ 83 $ 36 Accrual 28 6 16 6 Weather-related damages (85) (24) (58) (3) Balance at June 30, 2023 $ 159 $ 79 $ 41 $ 39
Schedule of Asset Retirement Obligations	The estimated costs of decommissioning Plant Farley based on Alabama Power's June 2023 site study are as follows: Plant Farley Decommissioning periods: Beginning year 2037 Completion year 2087 (in millions) Site study costs: Radiated structures $ 1,402 Spent fuel management 513 Non-radiated structures 133 Total site study costs $ 2,048

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
Regulatory Matters (Tables)	Jun. 30, 2023
Regulated Operations [Abstract]
Schedule of Cost Recovery Clauses	The recovery balances for certain retail regulatory clauses of the traditional electric operating companies and Southern Company Gas at June 30, 2023 and December 31, 2022 were as follows: Regulatory Clause Balance Sheet Line Item June 30, December 31, 2022 (in millions) Alabama Power Rate CNP Compliance Other regulatory assets, current $ 20 $ 47 Other regulatory assets, deferred 40 — Rate CNP PPA Other regulatory assets, current 17 18 Other regulatory assets, deferred 95 102 Retail Energy Cost Recovery Other regulatory assets, current 146 102 Other regulatory assets, deferred 283 520 Georgia Power Fuel Cost Recovery () Receivables – under recovered fuel clause revenues $ 695 $ — Deferred under recovered fuel clause revenues 1,489 2,056 Mississippi Power Fuel Cost Recovery Receivables – customer accounts, net $ 24 $ 1 Ad Valorem Tax Other regulatory assets, current 6 12 Other regulatory assets, deferred 16 19 Southern Company Gas Natural Gas Cost Recovery Natural gas cost under recovery $ — $ 108 Natural gas cost over recovery 161 — () See "Georgia Power – Fuel Cost Recovery" herein for additional information.
Nuclear Construction Cost and Schedule	Georgia Power's approximate proportionate share of the remaining estimated capital cost to complete Plant Vogtle Units 3 and 4, including contingency, through July 2023 and March 2024, respectively, is as follows: (in millions) Base project capital cost forecast (a)(b) $ 10,576 Construction contingency estimate 17 Total project capital cost forecast (a)(b) 10,593 Net investment at June 30, 2023 (b) (9,944) Remaining estimate to complete $ 649 (a) Includes approximately $610 million of costs that are not shared with the other Vogtle Owners, including $33 million of construction monitoring costs approved for recovery by the Georgia PSC in its nineteenth VCM order, and approximately $407 million of incremental costs under the cost-sharing and tender provisions of the joint ownership agreements described below. Excludes financing costs expected to be capitalized through AFUDC of approximately $422 million, of which $365 million had been accrued through June 30, 2023. (b) Net of $1.7 billion received from Toshiba under the Guarantee Settlement Agreement and approximately $188 million in related customer refunds.
Schedule of Infrastructure Replacement Programs and Capital Projects	Capital expenditures incurred under specific infrastructure replacement programs and capital projects during the first six months of 2023 were as follows: Utility Program Six Months Ended June 30, 2023 (in millions) Nicor Gas Investing in Illinois $ 196 Virginia Natural Gas SAVE 37 Atlanta Gas Light System Reinforcement Rider 57 Chattanooga Gas Pipeline Replacement Program 4 Total $ 294

Revenue from Contracts with C_2

Revenue from Contracts with Customers and Lease Income (Tables)	6 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following table disaggregates revenue from contracts with customers for the three and six months ended June 30, 2023 and 2022: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2023 Operating revenues Retail electric revenues Residential $ 1,647 $ 648 $ 928 $ 71 $ — $ — Commercial 1,370 465 830 75 — — Industrial 864 429 353 82 — — Other 27 3 22 2 — — Total retail electric revenues 3,908 1,545 2,133 230 — — Natural gas distribution revenues Residential 330 — — — — 330 Commercial 82 — — — — 82 Transportation 284 — — — — 284 Industrial 6 — — — — 6 Other 51 — — — — 51 Total natural gas distribution revenues 753 — — — — 753 Wholesale electric revenues PPA energy revenues 253 58 24 2 175 — PPA capacity revenues 149 44 13 2 91 — Non-PPA revenues 61 12 6 70 83 — Total wholesale electric revenues 463 114 43 74 349 — Other natural gas revenues Gas marketing services 73 — — — — 73 Other natural gas revenues 8 — — — — 8 Total natural gas revenues 81 — — — — 81 Other revenues 327 43 145 10 16 — Total revenue from contracts with customers 5,532 1,702 2,321 314 365 834 Other revenue sources () 216 (13) 70 (3) 160 18 Total operating revenues $ 5,748 $ 1,689 $ 2,391 $ 311 $ 525 $ 852 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Six Months Ended June 30, 2023 Operating revenues Retail electric revenues Residential $ 3,174 $ 1,308 $ 1,730 $ 136 $ — $ — Commercial 2,619 894 1,582 143 — — Industrial 1,653 827 666 160 — — Other 54 6 44 4 — — Total retail electric revenues 7,500 3,035 4,022 443 — — Natural gas distribution revenues Residential 1,226 — — — — 1,226 Commercial 314 — — — — 314 Transportation 603 — — — — 603 Industrial 29 — — — — 29 Other 168 — — — — 168 Total natural gas distribution revenues 2,340 — — — — 2,340 Wholesale electric revenues PPA energy revenues 534 129 35 5 376 — PPA capacity revenues 341 105 25 34 179 — Non-PPA revenues 98 32 10 178 187 — Total wholesale electric revenues 973 266 70 217 742 — Other natural gas revenues Gas marketing services 304 — — — — 304 Other natural gas revenues 20 — — — — 20 Total natural gas revenues 324 — — — — 324 Other revenues 640 103 276 22 27 — Total revenue from contracts with customers 11,777 3,404 4,368 682 769 2,664 Other revenue sources () 451 (68) 199 20 264 64 Total operating revenues $ 12,228 $ 3,336 $ 4,567 $ 702 $ 1,033 $ 2,728 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2022 Operating revenues Retail electric revenues Residential $ 1,655 $ 617 $ 962 $ 76 $ — $ — Commercial 1,387 410 900 77 — — Industrial 1,005 368 553 84 — — Other 25 3 20 2 — — Total retail electric revenues 4,072 1,398 2,435 239 — — Natural gas distribution revenues Residential 474 — — — — 474 Commercial 130 — — — — 130 Transportation 276 — — — — 276 Industrial 16 — — — — 16 Other 67 — — — — 67 Total natural gas distribution revenues 963 — — — — 963 Wholesale electric revenues PPA energy revenues 585 108 40 5 441 — PPA capacity revenues 136 40 12 — 85 — Non-PPA revenues 62 35 6 169 196 — Total wholesale electric revenues 783 183 58 174 722 — Other natural gas revenues Gas marketing services 90 — — — — 90 Other natural gas revenues 10 — — — — 10 Total natural gas revenues 100 — — — — 100 Other revenues 308 63 121 9 9 — Total revenue from contracts with customers 6,226 1,644 2,614 422 731 1,063 Other revenue sources () 980 287 507 12 168 20 Total operating revenues $ 7,206 $ 1,931 $ 3,121 $ 434 $ 899 $ 1,083 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Six Months Ended June 30, 2022 Operating revenues Retail electric revenues Residential $ 3,179 $ 1,250 $ 1,783 $ 146 $ — $ — Commercial 2,567 786 1,638 143 — — Industrial 1,732 691 887 154 — — Other 51 7 40 4 — — Total retail electric revenues 7,529 2,734 4,348 447 — — Natural gas distribution revenues Residential 1,490 — — — — 1,490 Commercial 400 — — — — 400 Transportation 613 — — — — 613 Industrial 48 — — — — 48 Other 195 — — — — 195 Total natural gas distribution revenues 2,746 — — — — 2,746 Wholesale electric revenues PPA energy revenues 930 168 72 8 694 — PPA capacity revenues 268 78 23 3 166 — Non-PPA revenues 124 99 15 271 269 — Total wholesale electric revenues 1,322 345 110 282 1,129 — Other natural gas revenues Gas marketing services 333 — — — — 333 Other natural gas revenues 26 — — — — 26 Total natural gas revenues 359 — — — — 359 Other revenues 530 109 216 17 17 — Total revenue from contracts with customers 12,486 3,188 4,674 746 1,146 3,105 Other revenue sources () 1,368 392 654 23 292 35 Total operating revenues $ 13,854 $ 3,580 $ 5,328 $ 769 $ 1,438 $ 3,140 (*) Other revenue sources relate to revenues from customers accounted for as derivatives and leases, alternative revenue programs at Southern Company Gas, and cost recovery mechanisms and revenues that meet other scope exceptions for revenues from contracts with customers at the traditional electric operating companies.
Schedule of Contract Balances	The following table reflects the closing balances of receivables, contract assets, and contract liabilities related to revenues from contracts with customers at June 30, 2023 and December 31, 2022: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Accounts Receivable At June 30, 2023 $ 2,423 $ 670 $ 986 $ 101 $ 126 $ 461 At December 31, 2022 3,123 696 922 92 237 1,107 Contract Assets At June 30, 2023 $ 167 $ — $ 73 $ — $ — $ 30 At December 31, 2022 156 2 89 — — — Contract Liabilities At June 30, 2023 $ 73 $ 1 $ 28 $ 3 $ 1 $ — At December 31, 2022 45 4 9 — 1 —
Schedule of Remaining Performance Obligations	Revenues from contracts with customers related to these performance obligations remaining at June 30, 2023 are expected to be recognized as follows: 2023 (remaining) 2024 2025 2026 2027 Thereafter (in millions) Southern Company $ 333 $ 544 $ 351 $ 316 $ 319 $ 2,089 Alabama Power 11 8 7 — — — Georgia Power 43 58 28 14 14 23 Southern Power 188 358 302 303 310 2,077 Southern Company Gas 11 29 — — — —
Schedule of Lease Income	Lease income for the three and six months ended June 30, 2023 and 2022 is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) For the Three Months Ended June 30, 2023 Lease income - interest income on sales-type leases $ 6 $ — $ — $ 4 $ 2 $ — Lease income - operating leases 42 11 7 1 21 9 Variable lease income 123 — — — 132 — Total lease income $ 171 $ 11 $ 7 $ 5 $ 155 $ 9 For the Six Months Ended June 30, 2023 Lease income - interest income on sales-type leases $ 12 $ — $ — $ 7 $ 5 $ — Lease income - operating leases 92 29 14 2 42 18 Variable lease income 192 — — — 207 — Total lease income $ 296 $ 29 $ 14 $ 9 $ 254 $ 18 For the Three Months Ended June 30, 2022 Lease income - interest income on sales-type leases $ 7 $ — $ — $ 4 $ 3 $ — Lease income - operating leases 52 19 8 — 21 9 Variable lease income 129 — — — 138 — Total lease income $ 188 $ 19 $ 8 $ 4 $ 162 $ 9 For the Six Months Ended June 30, 2022 Lease income - interest income on sales-type leases $ 13 $ — $ — $ 8 $ 5 $ — Lease income - operating leases 105 39 16 1 42 18 Variable lease income 211 — — — 227 — Total lease income $ 329 $ 39 $ 16 $ 9 $ 274 $ 18

Consolidated Entities and Equ_2

Consolidated Entities and Equity Method Investments (Tables)	6 Months Ended
	Jun. 30, 2023
Regulated Operations [Abstract]
Schedule of Equity Method Investments	The carrying amounts of Southern Company Gas' equity method investments at June 30, 2023 and December 31, 2022 and related earnings from those investments for the three and six months ended June 30, 2023 and 2022 were as follows: Investment Balance June 30, 2023 December 31, 2022 (in millions) SNG $ 1,220 $ 1,243 Other 32 33 Total $ 1,252 $ 1,276
Schedule of Earnings (Loss) from Equity Method Investments	Three Months Ended June 30, Six Months Ended June 30, Earnings from Equity Method Investments 2023 2022 2023 2022 (in millions) SNG $ 28 $ 31 $ 72 $ 70 Other — — — 1 Total $ 28 $ 31 $ 72 $ 71

Financing and Leases (Tables)

Financing and Leases (Tables)	6 Months Ended
Financing and Leases (Tables)	Jun. 30, 2023
Debt Disclosure [Abstract]
Schedule of Credit Arrangements	At June 30, 2023, committed credit arrangements with banks were as follows: Expires Company 2024 2025 2026 2028 Total Unused Expires within (in millions) Southern Company parent (a) $ 150 $ — $ — $ 1,850 $ 2,000 $ 1,998 $ 150 Alabama Power 550 — — 700 1,250 1,250 — Georgia Power — — — 1,750 1,750 1,726 — Mississippi Power — 125 150 — 275 275 — Southern Power (a)(b) — — — 600 600 589 — Southern Company Gas (c) 100 — — 1,500 1,600 1,598 100 SEGCO 30 — — — 30 30 30 Southern Company $ 830 $ 125 $ 150 $ 6,400 $ 7,505 $ 7,466 $ 280 (a) Arrangement expiring in 2028 represents a $2.45 billion combined arrangement for Southern Company and Southern Power as borrowers. Pursuant to the combined facility, the allocations between Southern Company and Southern Power may be adjusted. (b) Does not include Southern Power Company's $75 million and $100 million continuing letter of credit facilities for standby letters of credit, expiring in 2025 and 2026, respectively, of which $9 million and $16 million, respectively, was unused at June 30, 2023. In March 2023, Southern Power amended the $100 million letter of credit facility, which, among other things, extended the expiration date from 2025 to 2026 and increased the amount from $75 million. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities. (c) Southern Company Gas, as the parent entity, guarantees the obligations of Southern Company Gas Capital, which is the borrower of $800 million of the credit arrangement expiring in 2028. Southern Company Gas' committed credit arrangement expiring in 2028 also includes $700 million for which Nicor Gas is the borrower and which is restricted for working capital needs of Nicor Gas. Pursuant to the multi-year credit arrangement expiring in 2028, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower under a $100 million credit arrangement expiring in 2024.
Schedule of Shares Used to Compute Diluted Earnings Per Share	Shares used to compute diluted EPS were as follows: Three Months Ended June 30, Six Months Ended June 30, 2023 2022 2023 2022 (in millions) As reported shares 1,092 1,065 1,092 1,064 Effect of stock-based compensation 6 5 6 5 Effect of equity units — 2 — 1 Diluted shares 1,098 1,072 1,098 1,070

Retirement Benefits (Tables)

Retirement Benefits (Tables)	6 Months Ended
Retirement Benefits (Tables)	Jun. 30, 2023
Retirement Benefits [Abstract]
Schedule of Pension Plans and Postretirement Plans	Components of the net periodic benefit costs for the three and six months ended June 30, 2023 and 2022 are presented in the following tables. Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2023 Pension Plans Service cost $ 69 $ 16 $ 17 $ 3 $ 1 $ 6 Interest cost 157 36 47 7 2 11 Expected return on plan assets (308) (74) (96) (14) (4) (22) Amortization: Prior service costs — — 1 — — (1) Regulatory asset — — — — — 4 Net (gain) loss 8 3 3 — — (1) Net periodic pension income $ (74) $ (19) $ (28) $ (4) $ (1) $ (3) Postretirement Benefits Service cost $ 3 $ 1 $ 1 $ — $ — $ — Interest cost 17 4 7 1 — 2 Expected return on plan assets (20) (9) (8) — — (2) Amortization: Prior service costs 1 — — — — — Regulatory asset — — — — — 2 Net gain (3) — (1) — — (1) Net periodic postretirement benefit cost (income) $ (2) $ (4) $ (1) $ 1 $ — $ 1 Six Months Ended June 30, 2023 Pension Plans Service cost $ 138 $ 32 $ 34 $ 6 $ 3 $ 12 Interest cost 313 72 95 14 4 21 Expected return on plan assets (615) (148) (192) (28) (8) (44) Amortization: Prior service costs — — 1 — — (1) Regulatory asset — — — — — 8 Net (gain) loss 16 5 6 — — (2) Net periodic pension income $ (148) $ (39) $ (56) $ (8) $ (1) $ (6) Postretirement Benefits Service cost $ 7 $ 2 $ 2 $ — $ — $ — Interest cost 35 8 13 2 — 4 Expected return on plan assets (41) (17) (15) (1) — (3) Amortization: Prior service costs 1 — — — — — Regulatory asset — — — — — 3 Net gain (6) (1) (2) — — (2) Net periodic postretirement benefit cost (income) $ (4) $ (8) $ (2) $ 1 $ — $ 2 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2022 Pension Plans Service cost $ 103 $ 24 $ 26 $ 4 $ 3 $ 8 Interest cost 102 24 30 4 1 7 Expected return on plan assets (317) (75) (100) (14) (4) (24) Amortization: Prior service costs — — 1 — — — Regulatory asset — — — — — 4 Net loss 60 15 19 4 — 1 Net periodic pension income $ (52) $ (12) $ (24) $ (2) $ — $ (4) Postretirement Benefits Service cost $ 5 $ 2 $ 1 $ — $ — $ — Interest cost 11 2 3 1 — 1 Expected return on plan assets (20) (8) (6) (1) — (1) Amortization: Regulatory asset — — — — — 1 Net loss — — 1 — — — Net periodic postretirement benefit cost (income) $ (4) $ (4) $ (1) $ — $ — $ 1 Six Months Ended June 30, 2022 Pension Plans Service cost $ 206 $ 49 $ 52 $ 8 $ 5 $ 17 Interest cost 204 48 61 9 3 14 Expected return on plan assets (633) (152) (199) (29) (8) (46) Amortization: Prior service costs — — 1 — — (1) Regulatory asset — — — — — 8 Net loss 120 31 37 7 1 3 Net periodic pension cost (income) $ (103) $ (24) $ (48) $ (5) $ 1 $ (5) Postretirement Benefits Service cost $ 11 $ 3 $ 3 $ — $ — $ 1 Interest cost 21 5 7 1 — 2 Expected return on plan assets (40) (16) (13) (1) — (3) Amortization: Regulatory asset — — — — — 3 Net (gain) loss — — 1 — — (1) Net periodic postretirement benefit cost (income) $ (8) $ (8) $ (2) $ — $ — $ 2

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
Fair Value Measurements (Tables)	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value	At June 30, 2023, assets and liabilities measured at fair value on a recurring basis during the period, together with their associated level of the fair value hierarchy, were as follows: Fair Value Measurements Using: At June 30, 2023 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 7 $ 86 $ — $ — $ 93 Interest rate derivatives — 4 — — 4 Investments in trusts: (b)(c) Domestic equity 718 205 — — 923 Foreign equity 140 167 — — 307 U.S. Treasury and government agency securities — 333 — — 333 Municipal bonds — 46 — — 46 Pooled funds – fixed income — 7 — — 7 Corporate bonds — 391 — — 391 Mortgage and asset backed securities — 90 — — 90 Private equity — — — 166 166 Cash and cash equivalents 2 — — — 2 Other 31 7 — 9 47 Cash equivalents 1,494 12 — — 1,506 Other investments 9 34 8 — 51 Total $ 2,401 $ 1,382 $ 8 $ 175 $ 3,966 Liabilities: Energy-related derivatives (a) $ 33 $ 278 $ — $ — $ 311 Interest rate derivatives — 304 — — 304 Foreign currency derivatives — 170 — — 170 Contingent consideration — — 12 — 12 Other — 13 — — 13 Total $ 33 $ 765 $ 12 $ — $ 810 Fair Value Measurements Using: At June 30, 2023 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 32 $ — $ — $ 32 Nuclear decommissioning trusts: (b) Domestic equity 420 198 — — 618 Foreign equity 140 — — — 140 U.S. Treasury and government agency securities — 20 — — 20 Municipal bonds — 1 — — 1 Corporate bonds — 221 — — 221 Mortgage and asset backed securities — 21 — — 21 Private equity — — — 166 166 Other 7 — — 9 16 Cash equivalents 110 12 — — 122 Other investments — 34 — — 34 Total $ 677 $ 539 $ — $ 175 $ 1,391 Liabilities: Energy-related derivatives $ — $ 84 $ — $ — $ 84 Georgia Power Assets: Energy-related derivatives $ — $ 17 $ — $ — $ 17 Nuclear decommissioning trusts: (b)(c) Domestic equity 298 1 — — 299 Foreign equity 166 — — 166 U.S. Treasury and government agency securities — 313 — — 313 Municipal bonds — 45 — — 45 Corporate bonds — 170 — — 170 Mortgage and asset backed securities — 69 — — 69 Other 24 7 — — 31 Total $ 322 $ 788 $ — $ — $ 1,110 Liabilities: Energy-related derivatives $ — $ 102 $ — $ — $ 102 Fair Value Measurements Using: At June 30, 2023 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 27 $ — $ — $ 27 Liabilities: Energy-related derivatives $ — $ 55 $ — $ — $ 55 Southern Power Assets: Energy-related derivatives $ — $ 4 $ — $ — $ 4 Cash equivalents 5 — — — 5 Total $ 5 $ 4 $ — $ — $ 9 Liabilities: Energy-related derivatives $ — $ 10 $ — $ — $ 10 Foreign currency derivatives — 28 — — 28 Contingent consideration — — 12 — 12 Other — 13 — — 13 Total $ — $ 51 $ 12 $ — $ 63 Southern Company Gas Assets: Energy-related derivatives (a) $ 7 $ 6 $ — $ — $ 13 Interest rate derivatives — 4 — — 4 Non-qualified deferred compensation trusts: Domestic equity — 6 — — 6 Foreign equity — 1 — — 1 Pooled funds – fixed income — 7 — — 7 Cash equivalents 2 — — — 2 Cash equivalents and restricted cash 215 — — — 215 Total $ 224 $ 24 $ — $ — $ 248 Liabilities: Energy-related derivatives (a) $ 33 $ 27 $ — $ — $ 60 Interest rate derivatives — 88 — — 88 Total $ 33 $ 115 $ — $ — $ 148 (a) Excludes cash collateral of $52 million. (b) Excludes receivables related to investment income, pending investment sales, payables related to pending investment purchases, and currencies. See Note 6 to the financial statements in Item 8 of the Form 10-K for additional information. (c) Includes investment securities pledged to creditors and collateral received and excludes payables related to the securities lending program. At June 30, 2023, approximately $25 million of the fair market value of Georgia Power's nuclear decommissioning trust funds' securities were on loan to creditors under the funds' managers' securities lending program. See Note 6 to the financial statements in Item 8 of the Form 10-K for additional information.
Schedule of Increase (Decrease) In Fair Value Of Funds	The fair value of the funds, including reinvested interest and dividends and excluding the funds' expenses, increased (decreased) by the amounts shown in the table below for the three and six months ended June 30, 2023 and 2022. The changes were recorded as a change to the regulatory assets and liabilities related to AROs for Georgia Power and Alabama Power, respectively. Three Months Ended Six Months Ended Fair value increases (decreases) June 30, 2023 June 30, 2022 June 30, 2023 June 30, 2022 (in millions) Southern Company $ 132 $ (230) $ 228 $ (380) Alabama Power 58 (125) 103 (192) Georgia Power 74 (105) 125 (188)
Schedule of Financial Instruments for which Carrying Amount Did Not Equal Fair Value	At June 30, 2023, other financial instruments for which the carrying amount did not equal fair value were as follows: Southern Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas () (in billions) Long-term debt, including securities due within one year: Carrying amount $ 58.9 $ 10.8 $ 16.5 $ 1.6 $ 3.0 $ 7.5 Fair value 53.5 9.5 15.0 1.4 2.8 6.6 () The long-term debt of Southern Company Gas is recorded at amortized cost, including the fair value adjustments at the effective date of the 2016 merger with Southern Company. Southern Company Gas amortizes the fair value adjustments over the remaining lives of the respective bonds, the latest being through 2043.

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
Derivatives (Tables)	Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Energy-Related Derivatives	At June 30, 2023, the net volume of energy-related derivative contracts for natural gas positions, together with the longest hedge date over which the respective entity is hedging its exposure to the variability in future cash flows for forecasted transactions and the longest non-hedge date for derivatives not designated as hedges, were as follows: Net Longest Longest (in millions) Southern Company () 422 2030 2028 Alabama Power 108 2026 2023 Georgia Power 109 2026 2023 Mississippi Power 85 2027 2023 Southern Power 10 2030 2024 Southern Company Gas () 110 2028 2028 (*) Southern Company Gas' derivative instruments include both long and short natural gas positions. A long position is a contract to purchase natural gas and a short position is a contract to sell natural gas. Southern Company Gas' volume represents the net of 119.7 million mmBtu long natural gas positions and 9.4 million mmBtu short natural gas positions at June 30, 2023, which is also included in Southern Company's total volume.
Schedule of Interest Rate Derivatives	At June 30, 2023, the following interest rate derivatives were outstanding: Notional Weighted Interest Hedge Fair Value Gain (Loss) at June 30, 2023 (in millions) (in millions) Cash Flow Hedges of Forecasted Debt Southern Company Gas $ 250 3.40% N/A August $ 4 Fair Value Hedges of Existing Debt Southern Company parent 400 1-month LIBOR + 0.68% 1.75% March 2028 (56) Southern Company parent 1,000 1-month LIBOR + 2.36% 3.70% April (160) Southern Company Gas 500 1-month LIBOR + 0.38% 1.75% January 2031 (88) Southern Company $ 2,150 $ (300)
Schedule of Foreign Currency Derivatives	At June 30, 2023, the following foreign currency derivatives were outstanding: Pay Notional Pay Receive Notional Receive Hedge Fair Value Gain (Loss) at June 30, 2023 (in millions) (in millions) (in millions) Cash Flow Hedges of Existing Debt Southern Power $ 564 3.78% € 500 1.85% June 2026 $ (28) Fair Value Hedges of Existing Debt Southern Company parent 1,476 3.39% 1,250 1.88% September 2027 (142) Southern Company $ 2,040 € 1,750 $ (170)
Schedule of Derivative Category and Balance Sheet Location	The fair value of energy-related derivatives, interest rate derivatives, and foreign currency derivatives was reflected in the balance sheets as follows: At June 30, 2023 At December 31, 2022 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Southern Company Energy-related derivatives designated as hedging instruments for regulatory purposes Assets from risk management activities/Liabilities from risk management activities $ 46 $ 166 $ 123 $ 121 Other deferred charges and assets/Other deferred credits and liabilities 36 101 52 44 Total derivatives designated as hedging instruments for regulatory purposes 82 267 175 165 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Assets from risk management activities/Liabilities from risk management activities 1 32 3 27 Other deferred charges and assets/Other deferred credits and liabilities 3 5 6 4 Interest rate derivatives: Assets from risk management activities/Liabilities from risk management activities 4 77 12 62 Other deferred charges and assets/Other deferred credits and liabilities — 227 — 240 Foreign currency derivatives: Assets from risk management activities/Liabilities from risk management activities — 35 — 34 Other deferred charges and assets/Other deferred credits and liabilities — 135 — 182 Total derivatives designated as hedging instruments in cash flow and fair value hedges 8 511 21 549 Energy-related derivatives not designated as hedging instruments Assets from risk management activities/Liabilities from risk management activities 7 7 13 13 Other deferred charges and assets/Other deferred credits and liabilities — — 2 1 Total derivatives not designated as hedging instruments 7 7 15 14 Gross amounts recognized 97 785 211 728 Gross amounts offset (a) (40) (92) (70) (111) Net amounts recognized in the Balance Sheets (b) $ 57 $ 693 $ 141 $ 617 At June 30, 2023 At December 31, 2022 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Alabama Power (c) Energy-related derivatives designated as hedging instruments for regulatory purposes Other current assets/Other current liabilities $ 20 $ 46 $ 42 $ 21 Other deferred charges and assets/Other deferred credits and liabilities 12 38 20 18 Total derivatives designated as hedging instruments for regulatory purposes 32 84 62 39 Gross amounts offset (20) (20) (24) (24) Net amounts recognized in the Balance Sheets $ 12 $ 64 $ 38 $ 15 Georgia Power Energy-related derivatives designated as hedging instruments for regulatory purposes Assets from risk management activities/Other current liabilities $ 7 $ 65 $ 36 $ 43 Other deferred charges and assets/Other deferred credits and liabilities 8 37 6 18 Total derivatives designated as hedging instruments for regulatory purposes 15 102 42 61 Energy-related derivatives not designated as hedging instruments Other current assets/Other current liabilities 2 — — 1 Gross amounts recognized 17 102 42 62 Gross amounts offset (12) (12) (21) (21) Net amounts recognized in the Balance Sheets $ 5 $ 90 $ 21 $ 41 Mississippi Power (c) Energy-related derivatives designated as hedging instruments for regulatory purposes Assets from risk management activities/Other current liabilities $ 11 $ 28 $ 33 $ 24 Other deferred charges and assets/Other deferred credits and liabilities 16 27 26 8 Total derivatives designated as hedging instruments for regulatory purposes 27 55 59 32 Gross amounts offset (19) (19) (17) (17) Net amounts recognized in the Balance Sheets $ 8 $ 36 $ 42 $ 15 At June 30, 2023 At December 31, 2022 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Southern Power Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Other current assets/Other current liabilities $ — $ 9 $ — $ 12 Other deferred charges and assets/Other deferred credits and liabilities 3 1 5 — Foreign currency derivatives: Other current assets/Other current liabilities — 11 — 11 Other deferred charges and assets/Other deferred credits and liabilities — 17 — 36 Total derivatives designated as hedging instruments in cash flow and fair value hedges 3 38 5 59 Energy-related derivatives not designated as hedging instruments Other current assets/Other current liabilities — — 2 — Other deferred charges and assets/Other deferred credits and liabilities 1 — 1 — Total derivatives not designated as hedging instruments 1 — 3 — Gross amounts recognized 4 38 8 59 Gross amounts offset (1) (1) — — Net amounts recognized in the Balance Sheets $ 3 $ 37 $ 8 $ 59 Southern Company Gas Energy-related derivatives designated as hedging instruments for regulatory purposes Other current assets/Other current liabilities $ 8 $ 27 $ 12 $ 33 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Other current assets/Other current liabilities 1 23 3 15 Other deferred charges and assets/Other deferred credits and liabilities — 4 1 4 Interest rate derivatives: Other current assets/Other current liabilities 4 19 — 14 Other deferred charges and assets/Other deferred credits and liabilities — 69 — 72 Total derivatives designated as hedging instruments in cash flow and fair value hedges 5 115 4 105 Energy-related derivatives not designated as hedging instruments Other current assets/Other current liabilities 4 6 11 12 Other deferred charges and assets/Other deferred credits and liabilities — — 1 1 Total derivatives not designated as hedging instruments 4 6 12 13 Gross amounts recognized 17 148 28 151 Gross amounts offset (a) 14 (38) — (41) Net amounts recognized in the Balance Sheets (b) $ 31 $ 110 $ 28 $ 110 (a) Gross amounts offset includes cash collateral held on deposit in broker margin accounts of $52 million and $41 million at June 30, 2023 and December 31, 2022, respectively. (b) Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives for both periods presented. (c) Energy-related derivatives not designated as hedging instruments were immaterial for Alabama Power and Mississippi Power for both periods presented.
Schedule of Pre-tax Effects of Unrealized Derivative Gains (Losses)	At June 30, 2023 and December 31, 2022, the pre-tax effects of unrealized derivative gains (losses) arising from energy-related derivative instruments designated as regulatory hedging instruments and deferred were as follows: Regulatory Hedge Unrealized Gain (Loss) Recognized in the Balance Sheet Derivative Category and Balance Sheet Southern Alabama Georgia Mississippi Southern Company Gas (in millions) At June 30, 2023: Energy-related derivatives: Other regulatory assets, current $ (141) $ (37) $ (60) $ (22) $ (22) Other regulatory assets, deferred (71) (27) (30) (14) — Other regulatory liabilities, current 29 11 2 4 12 Other regulatory liabilities, deferred 6 1 1 4 — Total energy-related derivative gains (losses) $ (177) $ (52) $ (87) $ (28) $ (10) At December 31, 2022: Energy-related derivatives: Other regulatory assets, current $ (71) $ (8) $ (26) $ (13) $ (24) Other regulatory assets, deferred (23) (7) (14) (2) — Other regulatory liabilities, current 72 29 19 22 2 Other regulatory liabilities, deferred 31 9 2 20 — Total energy-related derivative gains (losses) $ 9 $ 23 $ (19) $ 27 $ (22)
Schedule of Pre-Tax Effects of Hedging on AOCI	For the three and six months ended June 30, 2023 and 2022, the pre-tax effects of cash flow and fair value hedge accounting on accumulated OCI for the applicable Registrants were as follows: Gain (Loss) Recognized in OCI on Derivatives For the Three Months Ended June 30, For the Six Months Ended June 30, 2023 2022 2023 2022 (in millions) (in millions) Southern Company Cash flow hedges: Energy-related derivatives $ (5) $ (1) $ (50) $ 41 Interest rate derivatives 3 21 (10) 30 Foreign currency derivatives 8 (74) 9 (102) Fair value hedges () : Foreign currency derivatives 30 (7) 1 (3) Total $ 36 $ (61) $ (50) $ (34) Georgia Power Cash flow hedges: Interest rate derivatives $ (1) $ 19 $ (3) $ 31 Southern Power Cash flow hedges: Energy-related derivatives $ (2) $ 2 $ (13) $ 7 Foreign currency derivatives 8 (74) 9 (102) Total $ 6 $ (72) $ (4) $ (95) Southern Company Gas Cash flow hedges: Energy-related derivatives $ (3) $ (2) $ (37) $ 35 Interest rate derivatives 3 (5) 4 (5) Total $ — $ (7) $ (33) $ 30 () Represents amounts excluded from the assessment of effectiveness for which the difference between changes in fair value and periodic amortization is recorded in OCI.
Schedule of Pre-Tax Effects of Cash Flow and Fair Value Hedging on Income	For the three and six months ended June 30, 2023 and 2022, the pre-tax effects of cash flow and fair value hedge accounting on income were as follows: Location and Amount of Gain (Loss) Recognized in Income on Cash Flow and Fair Value Hedging Relationships For the Three Months Ended June 30, For the Six Months Ended June 30, 2023 2022 2023 2022 (in millions) (in millions) Southern Company Total cost of natural gas $ 199 $ 452 $ 1,097 $ 1,546 Gain (loss) on energy-related cash flow hedges (a) (9) 10 (29) 18 Total depreciation and amortization 1,112 913 2,222 1,805 Gain (loss) on energy-related cash flow hedges (a) (4) 4 (13) 6 Total interest expense, net of amounts capitalized (610) (488) (1,192) (950) Gain (loss) on interest rate cash flow hedges (a) (5) (6) (9) (13) Gain (loss) on foreign currency cash flow hedges (a) (2) (7) (5) (13) Gain (loss) on interest rate fair value hedges (b) (45) (76) (3) (198) Total other income (expense), net 142 139 286 283 Gain (loss) on foreign currency cash flow hedges (a)(c) — (73) 10 (97) Gain (loss) on foreign currency fair value hedges 29 (96) 26 (121) Amount excluded from effectiveness testing recognized in earnings (29) 7 (1) 3 Southern Power Total depreciation and amortization $ 122 $ 131 $ 250 $ 251 Gain (loss) on energy-related cash flow hedges (a) (4) 4 (13) 6 Total interest expense, net of amounts capitalized (33) (36) (66) (73) Gain (loss) on foreign currency cash flow hedges (a) (2) (7) (5) (13) Total other income (expense), net 2 1 4 3 Gain (loss) on foreign currency cash flow hedges (a)(c) — (73) 10 (97) Southern Company Gas Total cost of natural gas $ 199 $ 452 $ 1,097 $ 1,546 Gain (loss) on energy-related cash flow hedges (a) (9) 10 (29) 18 Total interest expense, net of amounts capitalized (73) (61) (150) (122) Gain (loss) on interest rate cash flow hedges (a) — (1) (1) (1) Gain (loss) on interest rate fair value hedges (b) (15) (22) (2) (57) (a) Reclassified from accumulated OCI into earnings. (b) For fair value hedges, changes in the fair value of the derivative contracts are generally equal to changes in the fair value of the underlying debt and have no material impact on income. (c) The reclassification from accumulated OCI into other income (expense), net completely offsets currency gains and losses arising from changes in the U.S. currency exchange rates used to record the euro-denominated notes.
Schedule of Cumulative Basis Adjustments for Fair Value Hedges	At June 30, 2023 and December 31, 2022, the following amounts were recorded on the balance sheets related to cumulative basis adjustments for fair value hedges: Carrying Amount of the Hedged Item Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item Balance Sheet Location of Hedged Items At June 30, 2023 At December 31, 2022 At June 30, 2023 At December 31, 2022 (in millions) (in millions) Southern Company Long-term debt $ (2,970) $ (2,927) $ 265 $ 282 Southern Company Gas Long-term debt $ (417) $ (415) $ 80 $ 81
Schedule of Pre-tax Effect of Interest Rate and Energy Related Derivatives on Income	For the three and six months ended June 30, 2023 and 2022, the pre-tax effects of energy-related derivatives not designated as hedging instruments on the statements of income of Southern Company and Southern Company Gas were as follows: Gain (Loss) Three Months Ended June 30, Six Months Ended June 30, Derivatives in Non-Designated Hedging Relationships Statements of Income Location 2023 2022 2023 2022 (in millions) (in millions) Energy-related derivatives: Natural gas revenues () $ — $ (15) $ — $ (13) Cost of natural gas 16 (25) 29 (5) Total derivatives in non-designated hedging relationships $ 16 $ (40) $ 29 $ (18) () Excludes $14 million of gains for the six months ended June 30, 2023, and immaterial amounts for all other periods presented, recorded in natural gas revenues associated with weather derivatives.

Segment and Related Informati_2

Segment and Related Information (Tables)	6 Months Ended
Segment and Related Information (Tables)	Jun. 30, 2023
Segment Reporting [Abstract]
Schedule of Financial Data for Business Segments	Financial data for business segments and products and services for the three and six months ended June 30, 2023 and 2022 was as follows: Electric Utilities Traditional Southern Eliminations Total Southern Company Gas All Eliminations Consolidated (in millions) Three Months Ended June 30, 2023 Operating revenues $ 4,359 $ 525 $ (120) $ 4,764 $ 852 $ 180 $ (48) $ 5,748 Segment net income (loss) (a)(b) 823 85 — 908 85 (157) 2 838 Six Months Ended June 30, 2023 Operating revenues $ 8,472 $ 1,033 $ (258) $ 9,247 $ 2,728 $ 346 $ (93) $ 12,228 Segment net income (loss) (a)(b)(c) 1,433 187 — 1,620 393 (311) (2) 1,700 At June 30, 2023 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 144 $ — $ 5,161 Total assets 97,751 13,046 (589) 110,208 24,331 3,523 (946) 137,116 Three Months Ended June 30, 2022 Operating revenues $ 5,563 $ 899 $ (456) $ 6,006 $ 1,083 $ 159 $ (42) $ 7,206 Segment net income (loss) (a)(d) 1,036 98 — 1,134 115 (137) (5) 1,107 Six Months Ended June 30, 2022 Operating revenues $ 9,778 $ 1,438 $ (700) $ 10,516 $ 3,140 $ 283 $ (85) $ 13,854 Segment net income (loss) (a)(d) 1,811 170 — 1,981 433 (263) (12) 2,139 At December 31, 2022 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 144 $ — $ 5,161 Total assets 95,861 13,081 (659) 108,283 24,621 2,665 (678) 134,891 (a) Attributable to Southern Company. (b) For Southern Company Gas, includes a pre-tax charge of approximately $38 million ($28 million after tax) associated with the disallowance of certain capital expenditures at Nicor Gas. See Note (B) under "Southern Company Gas" for additional information. (c) For Southern Power, includes a $16 million pre-tax gain ($12 million after tax) on the sale of spare parts. (d) For the traditional electric operating companies, includes pre-tax charges of $52 million ($39 million after tax) at Georgia Power for the estimated probable loss associated with the construction of Plant Vogtle Units 3 and 4. See Note (B) and Note 2 to the financial statements in Item 8 of the Form 10-K under "Georgia Power – Nuclear Construction" for additional information. Business segment financial data for the three months ended June 30, 2023 and 2022 was as follows: Gas Distribution Operations Gas Gas Marketing Services Total All Other Eliminations Consolidated (in millions) Three Months Ended June 30, 2023 Operating revenues $ 764 $ 8 $ 75 $ 847 $ 9 $ (4) $ 852 Segment net income (loss) () 60 19 7 86 (1) — 85 Six Months Ended June 30, 2023 Operating revenues $ 2,383 $ 16 $ 320 $ 2,719 $ 22 $ (13) $ 2,728 Segment net income () 281 50 56 387 6 — 393 Total assets at June 30, 2023 22,366 1,552 1,542 25,460 9,606 (10,735) 24,331 Three Months Ended June 30, 2022 Operating revenues $ 980 $ 8 $ 92 $ 1,080 $ 10 $ (7) $ 1,083 Segment net income (loss) 92 23 1 116 (1) — 115 Six Months Ended June 30, 2022 Operating revenues $ 2,782 $ 16 $ 335 $ 3,133 $ 26 $ (19) $ 3,140 Segment net income 306 52 67 425 8 — 433 Total assets at December 31, 2022 22,040 1,577 1,616 25,233 8,943 (9,555) 24,621 (*) For gas distribution operations, includes a pre-tax charge of approximately $38 million ($28 million after tax) associated with the disallowance of certain capital expenditures at Nicor Gas. See Note (B) under "Southern Company Gas" for additional information.
Schedule of Financial Data for Products and Services	Electric Utilities' Revenues Retail Wholesale Other Total (in millions) Three Months Ended June 30, 2023 $ 3,859 $ 605 $ 300 $ 4,764 Three Months Ended June 30, 2022 4,789 937 280 6,006 Six Months Ended June 30, 2023 $ 7,458 $ 1,203 $ 586 $ 9,247 Six Months Ended June 30, 2022 8,402 1,601 513 10,516 Southern Company Gas' Revenues Gas Gas Other Total (in millions) Three Months Ended June 30, 2023 $ 761 $ 75 $ 16 $ 852 Three Months Ended June 30, 2022 975 92 16 1,083 Six Months Ended June 30, 2023 $ 2,372 $ 320 $ 36 $ 2,728 Six Months Ended June 30, 2022 2,765 335 40 3,140

Introduction - Schedule of Good

Introduction - Schedule of Goodwill (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 5,161	$ 5,161
SOUTHERN Co GAS
Goodwill [Line Items]
Goodwill	5,015	5,015
SOUTHERN Co GAS \| Gas distribution operations
Goodwill [Line Items]
Goodwill	4,034	4,034
SOUTHERN Co GAS \| Gas marketing services
Goodwill [Line Items]
Goodwill	$ 981	$ 981

Introduction - Schedule of Othe

Introduction - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Subject to amortization:
Gross Carrying Amount	$ 669	$ 671
Accumulated Amortization	(358)	(340)
Other Intangible Assets, Net	311	331
Not subject to amortization:
FCC licenses	75	75
Total other intangible assets
Gross Carrying Amount	744	746
Accumulated Amortization	(358)	(340)
Other Intangible Assets, Net	386	406
Customer relationships
Subject to amortization:
Gross Carrying Amount	212	212
Accumulated Amortization	(167)	(162)
Other Intangible Assets, Net	45	50
Total other intangible assets
Accumulated Amortization	(167)	(162)
Trade names
Subject to amortization:
Gross Carrying Amount	64	64
Accumulated Amortization	(49)	(44)
Other Intangible Assets, Net	15	20
Total other intangible assets
Accumulated Amortization	(49)	(44)
PPA fair value adjustments
Subject to amortization:
Gross Carrying Amount	390	390
Accumulated Amortization	(139)	(129)
Other Intangible Assets, Net	251	261
Total other intangible assets
Accumulated Amortization	(139)	(129)
Other
Subject to amortization:
Gross Carrying Amount	3	5
Accumulated Amortization	(3)	(5)
Other Intangible Assets, Net	0	0
Total other intangible assets
Accumulated Amortization	(3)	(5)
SOUTHERN POWER CO
Subject to amortization:
Accumulated Amortization	(139)	(129)
Total other intangible assets
Accumulated Amortization	(139)	(129)
SOUTHERN POWER CO \| PPA fair value adjustments
Subject to amortization:
Gross Carrying Amount	390	390
Accumulated Amortization	(139)	(129)
Other Intangible Assets, Net	251	261
Total other intangible assets
Accumulated Amortization	(139)	(129)
SOUTHERN Co GAS
Subject to amortization:
Gross Carrying Amount	182	182
Accumulated Amortization	(161)	(156)
Other Intangible Assets, Net	21	26
Total other intangible assets
Accumulated Amortization	(161)	(156)
Other Intangible Assets, Net	21	26
SOUTHERN Co GAS \| Customer relationships
Subject to amortization:
Gross Carrying Amount	156	156
Accumulated Amortization	(142)	(139)
Other Intangible Assets, Net	14	17
Total other intangible assets
Accumulated Amortization	(142)	(139)
SOUTHERN Co GAS \| Trade names
Subject to amortization:
Gross Carrying Amount	26	26
Accumulated Amortization	(19)	(17)
Other Intangible Assets, Net	7	9
Total other intangible assets
Accumulated Amortization	$ (19)	$ (17)

Introduction - Schedule of Amor

Introduction - Schedule of Amortization of Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 9	$ 9	$ 18	$ 19
Decrease in operating revenues	5	10	5	10
SOUTHERN POWER CO
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	5	5	10	10
SOUTHERN Co GAS
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 2	$ 2	$ 5	$ 5

Introduction - Schedule of Cash

Introduction - Schedule of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 2,123	$ 1,917
Restricted cash:
Total cash, cash equivalents, and restricted cash	2,244	2,037	$ 1,735	$ 1,829
Other current assets
Restricted cash:
Restricted cash	83	62
Other deferred charges and assets
Restricted cash:
Restricted cash	39	58
GEORGIA POWER CO
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	44	364
Restricted cash:
Total cash, cash equivalents, and restricted cash	160	480	230	33
GEORGIA POWER CO \| Other current assets
Restricted cash:
Restricted cash	80	60
GEORGIA POWER CO \| Other deferred charges and assets
Restricted cash:
Restricted cash	36	56
GEORGIA POWER CO \| Proceeds From Issuance Of Solid Waste Disposal Facility Revenue Bonds
Restricted cash:
Restricted cash	116	116
SOUTHERN POWER CO
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	169	131
Restricted cash:
Total cash, cash equivalents, and restricted cash	172	133	211	135
SOUTHERN POWER CO \| Other current assets
Restricted cash:
Restricted cash	0	0
SOUTHERN POWER CO \| Other deferred charges and assets
Restricted cash:
Restricted cash	3	3
SOUTHERN POWER CO \| Estimated Construction Completion Costs \| Deuel Harvest
Restricted cash:
Restricted cash	3	3
SOUTHERN Co GAS
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	242	81
Restricted cash:
Total cash, cash equivalents, and restricted cash	244	83	$ 218	$ 48
SOUTHERN Co GAS \| Other current assets
Restricted cash:
Restricted cash	3	2
SOUTHERN Co GAS \| Other deferred charges and assets
Restricted cash:
Restricted cash	$ 0	$ 0

Introduction - Storm Damage Res

Introduction - Storm Damage Reserves (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at December 31, 2022	$ 216
Balance at June 30, 2023	159
Accrued Storm Reserve
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Accrual	28
Storm Reserve
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages	(85)
ALABAMA POWER CO
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at December 31, 2022	97
Balance at June 30, 2023	79
ALABAMA POWER CO \| Accrued Storm Reserve
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Accrual	6
ALABAMA POWER CO \| Storm Reserve
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages	(24)
GEORGIA POWER CO
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at December 31, 2022	83
Balance at June 30, 2023	41
GEORGIA POWER CO \| Accrued Storm Reserve
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Accrual	16
GEORGIA POWER CO \| Storm Reserve
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages	(58)
MISSISSIPPI POWER CO
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at December 31, 2022	36
Balance at June 30, 2023	39
MISSISSIPPI POWER CO \| Accrued Storm Reserve
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Accrual	6
MISSISSIPPI POWER CO \| Storm Reserve
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Weather-related damages	$ (3)

Introduction - Asset Retirement

Introduction - Asset Retirement Obligations (Details) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2023	Mar. 06, 2023
ALABAMA POWER CO
Schedule of Asset Retirement Obligation [Line Items]
Asset retirement obligation, period increase	$ 15
Plant Vogtle Unit 3
Schedule of Asset Retirement Obligation [Line Items]
Asset retirement obligations		$ 90

Introduction - Decommissioning

Introduction - Decommissioning Expenses (Details) $ in Millions	1 Months Ended
	Jun. 30, 2023 USD ($)
Estimated Inflation Rate
Liability for Claims and Claims Adjustment Expense [Line Items]
ARO measurement input	0.045
Estimated Trust Earnings
Liability for Claims and Claims Adjustment Expense [Line Items]
ARO measurement input	0.070
ALABAMA POWER CO
Liability for Claims and Claims Adjustment Expense [Line Items]
Total site study costs	$ 2,048
Radiated structures \| ALABAMA POWER CO
Liability for Claims and Claims Adjustment Expense [Line Items]
Total site study costs	1,402
Spent fuel management \| ALABAMA POWER CO
Liability for Claims and Claims Adjustment Expense [Line Items]
Total site study costs	513
Non-radiated structures \| ALABAMA POWER CO
Liability for Claims and Claims Adjustment Expense [Line Items]
Total site study costs	$ 133

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Cost Recovery Clauses (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Natural gas cost under recovery	$ 0	$ 108
ALABAMA POWER CO \| Other regulatory assets, current
Loss Contingencies [Line Items]
Rate CNP Compliance	20	47
Rate CNP PPA	17	18
Retail Energy Cost Recovery	146	102
ALABAMA POWER CO \| Other regulatory assets, deferred
Loss Contingencies [Line Items]
Rate CNP Compliance	40	0
Rate CNP PPA	95	102
Retail Energy Cost Recovery	283	520
GEORGIA POWER CO \| Receivables – under recovered fuel clause revenues
Loss Contingencies [Line Items]
Fuel Cost Recovery(*)	695	0
GEORGIA POWER CO \| Deferred under recovered fuel clause revenues
Loss Contingencies [Line Items]
Fuel Cost Recovery(*)	1,489	2,056
MISSISSIPPI POWER CO \| Other regulatory assets, current
Loss Contingencies [Line Items]
Ad Valorem Tax	6	12
MISSISSIPPI POWER CO \| Other regulatory assets, deferred
Loss Contingencies [Line Items]
Ad Valorem Tax	16	19
MISSISSIPPI POWER CO \| Receivables – customer accounts, net
Loss Contingencies [Line Items]
Fuel Cost Recovery(*)	24	1
SOUTHERN Co GAS
Loss Contingencies [Line Items]
Natural gas cost under recovery	0	108
SOUTHERN Co GAS \| Other regulatory assets, current
Loss Contingencies [Line Items]
Natural gas cost under recovery	0	108
SOUTHERN Co GAS \| Natural gas cost over recovery
Loss Contingencies [Line Items]
Natural gas cost under recovery	$ 161	$ 0

Regulatory Matters - APC Certif

Regulatory Matters - APC Certificate of Convenience and Necessity (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Construction work in progress	$ 11,992	$ 10,896
Plant in service, net of depreciation	83,352	82,232
ALABAMA POWER CO
Public Utilities, General Disclosures [Line Items]
Construction work in progress	1,600	1,526
Plant in service, net of depreciation	23,234	$ 23,002
ALABAMA POWER CO \| Plant Barry Unit 8
Public Utilities, General Disclosures [Line Items]
Estimated in-service cost			$ 652
Construction work in progress	568
Construction in progress, work in progress amount	563
Plant in service, net of depreciation	$ 5

Regulatory Matters - APC Rate C

Regulatory Matters - APC Rate CNP New Plant (Details) $ in Millions	Mar. 24, 2023 USD ($)
ALABAMA POWER CO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease) amount	$ 78

Regulatory Matters - APC Renewa

Regulatory Matters - APC Renewable Generation Certificate (Details)	Jun. 14, 2023 MW	Jun. 13, 2023 MW	Apr. 04, 2023 claim MW
Public Utilities, General Disclosures [Line Items]
Renewable generation certificate, number of new solar power purchase agreements \| claim			2
ALABAMA POWER CO
Public Utilities, General Disclosures [Line Items]
Renewable generation certificate, additional generating capacity procured (in MWs)			160
Renewable generation certificate, generating capacity (in MWs)			490
Renewable generation certificate, authorized generating capacity (in MWs)			500
Renewable generation certificate, additional renewable capacity (in MWs)	2,400
Renewable generation certificate, size of allowable projects (in MWs)	200	80
Renewable generation certificate, annual approval limit (in MWs)	400	160

Regulatory Matters - GPC Plant

Regulatory Matters - GPC Plant Vogtle Unit 3 and Common Facilities Rate Proceeding (Details) $ in Millions	Aug. 01, 2023 USD ($)
Plant Vogtle Unit 3 \| GEORGIA POWER CO \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase, annual amount	$ 318

Regulatory Matters - GPC Fuel C

Regulatory Matters - GPC Fuel Cost Recovery (Details) $ in Millions	May 16, 2023 USD ($)
Public Utilities, General Disclosures [Line Items]
Under recovered fuel balance to be recovered	$ 2,200
GEORGIA POWER CO
Public Utilities, General Disclosures [Line Items]
Requested revenues increase (decrease) percentage	54%
Requested rate increase (decrease) amount	$ 1,100
Under recovered fuel balance to be recovered, period of recovery	3 years
GEORGIA POWER CO \| Maximum
Public Utilities, General Disclosures [Line Items]
Approved rate increase, percentage	40%
Approved rate increase (decrease)	$ 200

Regulatory Matters - GPC Integr

Regulatory Matters - GPC Integrated Resource Plan (Details) $ in Millions	1 Months Ended
	Aug. 31, 2022 USD ($)
GEORGIA POWER CO \| Plant Tugalo
Public Utilities, General Disclosures [Line Items]
Planned expenses to modernize plant	$ 115

Regulatory Matters - GPC Nuclea

Regulatory Matters - GPC Nuclear Construction (Details) - GEORGIA POWER CO - Plant Vogtle Units 3 And 4 $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2012 utility MW	Aug. 31, 2018
Loss Contingencies [Line Items]
Proportionate ownership share	45.70%
Number of construction units approved \| utility		2
Electric generating capacity in mega watts under consortium agreement \| MW		1,100
Estimated cost to complete, construction contingency estimate, financing costs	$ 3,500
Estimated cost to complete, construction contingency estimate, financing costs, incurred to date	3,400
Construction contingency estimate	43
Monthly AFUDC	$ 45
Percentage of ownership interest required for voting for continuing construction			90%
Vogtle Owners
Loss Contingencies [Line Items]
Period of notice required in the event letters of credit are not renewed	30 days
Minimum \| COVID-19
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss, loss of productivity, term	3 months
Maximum \| COVID-19
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss, loss of productivity, term	4 months
Estimate of possible loss	$ 200

Regulatory Matters - GPC Nucl_2

Regulatory Matters - GPC Nuclear Construction Cost and Schedule (Details) - GEORGIA POWER CO - USD ($) $ in Millions	6 Months Ended	12003 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Pre-tax charge to income		$ 407
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Base project capital cost forecast	$ 10,576
Construction contingency estimate	17
Total project capital cost forecast	10,593
Net investment as of end of the period	(9,944)
Remaining estimate to complete	649
Estimated cost to complete, costs not shared with other owners	610
Estimated cost to complete, construction monitoring costs approved for recovery	33
Expected capitalized costs	422
Capitalized interest accrued	365
Plant Vogtle Units 3 And 4 \| Twenty Fifth Vogtle Construction Monitoring Report
Loss Contingencies [Line Items]
Guarantor obligations	1,700
Customer refund	$ 188

Regulatory Matters - GPC Amendm

Regulatory Matters - GPC Amendments to the Vogtle Joint Ownership Agreements (Details) - USD ($)		1 Months Ended	6 Months Ended	12003 Months Ended
	Jan. 11, 2018	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jul. 31, 2022	Jun. 30, 2022	Aug. 31, 2018
Public Utilities, General Disclosures [Line Items]
Agreement with third party, amount of costs over projected forecast to be paid by company		20%
GEORGIA POWER CO
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income				$ 407,000,000
After tax charge to income				304,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO
Public Utilities, General Disclosures [Line Items]
Production tax credits, aggregate purchase price, maximum			$ 300,000,000
Preliminary estimated cost to complete			$ 10,593,000,000
Additional construction capital costs	$ 3,300,000,000			$ 345,000,000
Remaining share of construction costs, agreement to pay, percentage			100%
Percentage of ownership interest required for voting for continuing construction							90%
Percentage of costs, disallowed for recovery			6%
Costs disallowed for recovery, period			6 months
Public utilities, extension project schedule, term			1 year
Estimated cost to complete, starting dollar amount					$ 18,380,000,000
Proportionate ownership share			45.70%
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Vogtle Owners
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs			$ 100,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Vogtle Owners \| Tender Provision Dispute
Public Utilities, General Disclosures [Line Items]
Estimated cost to complete, starting dollar amount						$ 17,100,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| MEAG Power
Public Utilities, General Disclosures [Line Items]
Payment of power costs		$ 92,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category I
Public Utilities, General Disclosures [Line Items]
Preliminary estimated cost to complete			8,400,000,000
Additional construction capital costs, threshold			$ 800,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category II
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay			55.70%
Additional construction capital costs			$ 80,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category II \| Vogtle Owners
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay			44.30%
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category II \| Minimum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold			$ 800,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category II \| Maximum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold			$ 1,600,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category III
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay			65.70%
Additional construction capital costs			$ 100,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category III \| Vogtle Owners
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay			34.30%
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category III \| Minimum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold			$ 1,600,000,000
Plant Vogtle Units 3 And 4 \| GEORGIA POWER CO \| Category III \| Maximum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold			$ 2,100,000,000

Regulatory Matters - GPC Nucl_3

Regulatory Matters - GPC Nuclear Construction Regulatory Matters (Details) - Plant Vogtle Units 3 And 4 - GEORGIA POWER CO $ in Millions

6 Months Ended

12 Months Ended

12003 Months Ended

Feb. 16, 2023 USD ($)

Jan. 01, 2023 USD ($)

Jan. 01, 2021

Jan. 01, 2020

Jan. 11, 2018 USD ($)

Jan. 01, 2016

Jun. 30, 2023 USD ($)

Jun. 30, 2022 USD ($) claim

Dec. 31, 2024 USD ($)

Dec. 31, 2023 USD ($)

Dec. 31, 2022 USD ($)

Dec. 31, 2009 USD ($)

Dec. 31, 2022 USD ($)

Jun. 30, 2021 report

Jun. 30, 2018 USD ($)

Dec. 31, 2013

Public Utilities, General Disclosures [Line Items]

Estimated in-service capital cost

$ 4,418

Financing costs collected, net of tax

$ 3,000

Increase in tariff

$ 36

Additional construction capital costs

$ 3,300

$ 345

Payments for contractor settlement agreement

300

Amendment to estimated in-service capital cost

$ 5,680

Retail rate of return on common equity

10.95%

Public utilities, approved return on equity percentage

5.30%

8.30%

10%

Public utilities, approved return on equity, monthly percentage decrease

0.10%

Return on equity reduction, negative impact on earnings

$ 300

Increase to base capital cost forecast not seeking recovery

$ 700

Twenty Fourth Vogtle Construction Monitoring Report

Public Utilities, General Disclosures [Line Items]

Cost settlement agreement revised forecast, net of payments

$ 7,300

Twenty Fifth Vogtle Construction Monitoring Report

Public Utilities, General Disclosures [Line Items]

Number of approved construction management reports | report

Requested capital construction costs

7,900

Guarantor obligations

1,700

Customer refund

188

Twenty Sixth Vogtle Construction Monitoring Report

Public Utilities, General Disclosures [Line Items]

Requested capital construction costs

$ 1,100

Number of additional reports reviewed | claim

Twenty Seventh Vogtle Construction Monitoring Report

Public Utilities, General Disclosures [Line Items]

Requested capital construction costs

$ 461

Twenty Ninth Vogtle Construction Monitoring Report

Public Utilities, General Disclosures [Line Items]

Requested capital construction costs

$ 390

Scenario, Forecast

Public Utilities, General Disclosures [Line Items]

Return on equity reduction, negative impact on earnings

$ 60

$ 290

Regulatory Matters - MPC (Detai

Regulatory Matters - MPC (Details) - USD ($) $ in Millions					1 Months Ended
Regulatory Matters - MPC (Details) - USD ($) $ in Millions	Jul. 31, 2023	Apr. 04, 2023	Apr. 03, 2023	Mar. 31, 2023	Jul. 31, 2022
Loss Contingencies [Line Items]
Minimum annual accrual, amount			$ 8
MISSISSIPPI POWER CO
Loss Contingencies [Line Items]
Approved rate increase (decrease)		$ 12
MISSISSIPPI POWER CO \| Ad Valorem Tax Adjustment
Loss Contingencies [Line Items]
Requested rate increase (decrease) amount				$ 7
MISSISSIPPI POWER CO \| ECO Plan
Loss Contingencies [Line Items]
Approved rate increase (decrease)		$ 3
MISSISSIPPI POWER CO \| Municipal And Rural Associations Tariff
Loss Contingencies [Line Items]
Requested rate increase (decrease) amount					$ 23
MISSISSIPPI POWER CO \| Municipal And Rural Associations Tariff \| Subsequent Event
Loss Contingencies [Line Items]
Requested rate increase (decrease) amount	$ 16
Customer refund payments	$ 6

Regulatory Matters - GAS Schedu

Regulatory Matters - GAS Schedule of Infrastructure Replacement Programs and Capital Projects (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2019
SOUTHERN Co GAS
Public Utilities, General Disclosures [Line Items]
Capital expenditures	$ 294
Investing in Illinois \| SOUTHERN Co GAS
Public Utilities, General Disclosures [Line Items]
Capital expenditures	196
Investing in Illinois \| Nicor Gas
Public Utilities, General Disclosures [Line Items]
Capital expenditures		$ 415
SAVE \| SOUTHERN Co GAS
Public Utilities, General Disclosures [Line Items]
Capital expenditures	37
System Reinforcement Rider \| SOUTHERN Co GAS
Public Utilities, General Disclosures [Line Items]
Capital expenditures	57
Pipeline Replacement Program \| SOUTHERN Co GAS
Public Utilities, General Disclosures [Line Items]
Capital expenditures	$ 4

Regulatory Matters - GAS Nicor

Regulatory Matters - GAS Nicor Gas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2019
Public Utilities, General Disclosures [Line Items]
Total operating revenues	$ (5,748)	$ (7,206)	$ (12,228)	$ (13,854)
Total operating expenses	4,458	$ 5,551	$ 9,719	$ 10,815
Nicor Gas
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income	38
After-tax charge to income	28
Nicor Gas \| Investing in Illinois
Public Utilities, General Disclosures [Line Items]
Capital expenditures disallowed					$ 32
Capital expenditures					$ 415
Total operating revenues	8
Total operating expenses	$ 30

Regulatory Matters - GAS Atlant

Regulatory Matters - GAS Atlanta Gas Light (Details) $ in Millions	Jun. 30, 2023 USD ($)
SOUTHERN Co GAS
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease) amount	$ 53

Regulatory Matters - GAS Virgin

Regulatory Matters - GAS Virginia Natural Gas (Details) - Virginia Natural Gas - USD ($) $ in Millions	Jun. 07, 2023	Jan. 01, 2023
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease)	$ 48
Public utilities, approved return on equity percentage	9.70%
Public utilities, approved equity capital structure percentage	49.06%
Requested rate increase (decrease) amount		$ 69

Contingencies - General Litigat

Contingencies - General Litigation Matters (Details) - Pending Litigation $ in Millions	1 Months Ended	5 Months Ended	12 Months Ended
	Mar. 31, 2019 plaintiff	Feb. 28, 2022 claim	Dec. 31, 2018 USD ($) plaintiff defendant
GEORGIA POWER CO \| Class Action Lawsuit
Loss Contingencies [Line Items]
Complaints filed \| claim		8
MISSISSIPPI POWER CO \| Purported Violations of Mississippi Consumer Protection Act
Loss Contingencies [Line Items]
Number of plaintiffs			10
Number of defendants \| defendant			3
Number of additional plaintiffs	4
Underpayment of refunds \| $			$ 23.5

Contingencies - Environmental R

Contingencies - Environmental Remediation (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
GEORGIA POWER CO
Loss Contingencies [Line Items]
Environmental remediation liability, current and former sites	$ 14	$ 15
SOUTHERN Co GAS
Loss Contingencies [Line Items]
Environmental remediation liability, current and former sites	$ 230	$ 256

Contingencies - Other Matters (

Contingencies - Other Matters (Details) - USD ($) $ in Millions	1 Months Ended		11 Months Ended
	Aug. 31, 2022	Apr. 30, 2019	Jun. 30, 2023
Loss Contingencies [Line Items]
Estimated additional interest expense			$ 1
ALABAMA POWER CO \| AT&T
Loss Contingencies [Line Items]
Potential refund amount owed		$ 87
Refund payment period		6 years
MISSISSIPPI POWER CO
Loss Contingencies [Line Items]
Estimate of possible loss	$ 28

Revenue from Contracts with C_3

Revenue from Contracts with Customers and Lease Income - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 5,532	$ 6,226	$ 11,777	$ 12,486
Total operating revenues	5,748	7,206	12,228	13,854
Retail electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	3,859	4,789	7,458	8,402
Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,908	4,072	7,500	7,529
Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,647	1,655	3,174	3,179
Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,370	1,387	2,619	2,567
Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	864	1,005	1,653	1,732
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	27	25	54	51
Natural Gas
Disaggregation of Revenue [Line Items]
Total operating revenues	852	1,083	2,728	3,140
Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	753	963	2,340	2,746
Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	330	474	1,226	1,490
Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	82	130	314	400
Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	284	276	603	613
Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6	16	29	48
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	51	67	168	195
Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	605	937	1,203	1,601
Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	463	783	973	1,322
PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	253	585	534	930
PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	149	136	341	268
Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	61	62	98	124
Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	81	100	324	359
Gas marketing services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	73	90	304	333
Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8	10	20	26
Other revenue sources
Disaggregation of Revenue [Line Items]
Other revenues	216	980	451	1,368
Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	327	308	640	530
ALABAMA POWER CO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,702	1,644	3,404	3,188
Total operating revenues	1,689	1,931	3,336	3,580
ALABAMA POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	1,467	1,629	2,848	3,008
ALABAMA POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,545	1,398	3,035	2,734
ALABAMA POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	648	617	1,308	1,250
ALABAMA POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	465	410	894	786
ALABAMA POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	429	368	827	691
ALABAMA POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3	3	6	7
ALABAMA POWER CO \| Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	114	183	266	345
ALABAMA POWER CO \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	58	108	129	168
ALABAMA POWER CO \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	44	40	105	78
ALABAMA POWER CO \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	12	35	32	99
ALABAMA POWER CO \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Gas marketing services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Other revenue sources
Disaggregation of Revenue [Line Items]
Other revenues	(13)	287	(68)	392
ALABAMA POWER CO \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	43	63	103	109
GEORGIA POWER CO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,321	2,614	4,368	4,674
Total operating revenues	2,391	3,121	4,567	5,328
GEORGIA POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	2,165	2,908	4,146	4,926
GEORGIA POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,133	2,435	4,022	4,348
GEORGIA POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	928	962	1,730	1,783
GEORGIA POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	830	900	1,582	1,638
GEORGIA POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	353	553	666	887
GEORGIA POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	22	20	44	40
GEORGIA POWER CO \| Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	47	64	78	130
GEORGIA POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	43	58	70	110
GEORGIA POWER CO \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	24	40	35	72
GEORGIA POWER CO \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	13	12	25	23
GEORGIA POWER CO \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6	6	10	15
GEORGIA POWER CO \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Gas marketing services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Other revenue sources
Disaggregation of Revenue [Line Items]
Other revenues	70	507	199	654
GEORGIA POWER CO \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	145	121	276	216
MISSISSIPPI POWER CO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	314	422	682	746
Total operating revenues	311	434	702	769
MISSISSIPPI POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	227	252	464	469
MISSISSIPPI POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	230	239	443	447
MISSISSIPPI POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	71	76	136	146
MISSISSIPPI POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	75	77	143	143
MISSISSIPPI POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	82	84	160	154
MISSISSIPPI POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2	2	4	4
MISSISSIPPI POWER CO \| Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	74	174	217	282
MISSISSIPPI POWER CO \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2	5	5	8
MISSISSIPPI POWER CO \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2	0	34	3
MISSISSIPPI POWER CO \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	70	169	178	271
MISSISSIPPI POWER CO \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Gas marketing services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Other revenue sources
Disaggregation of Revenue [Line Items]
Other revenues	(3)	12	20	23
MISSISSIPPI POWER CO \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	10	9	22	17
SOUTHERN POWER CO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	365	731	769	1,146
Total operating revenues	525	899	1,033	1,438
SOUTHERN POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	349	722	742	1,129
SOUTHERN POWER CO \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	175	441	376	694
SOUTHERN POWER CO \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	91	85	179	166
SOUTHERN POWER CO \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	83	196	187	269
SOUTHERN POWER CO \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Gas marketing services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Other revenue sources
Disaggregation of Revenue [Line Items]
Other revenues	160	168	264	292
SOUTHERN POWER CO \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16	9	27	17
SOUTHERN Co GAS
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	834	1,063	2,664	3,105
Total operating revenues	852	1,083	2,728	3,140
SOUTHERN Co GAS \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	753	963	2,340	2,746
SOUTHERN Co GAS \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	330	474	1,226	1,490
SOUTHERN Co GAS \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	82	130	314	400
SOUTHERN Co GAS \| Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	284	276	603	613
SOUTHERN Co GAS \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6	16	29	48
SOUTHERN Co GAS \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	51	67	168	195
SOUTHERN Co GAS \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN Co GAS \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	81	100	324	359
SOUTHERN Co GAS \| Gas marketing services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	73	90	304	333
SOUTHERN Co GAS \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8	10	20	26
SOUTHERN Co GAS \| Other revenue sources
Disaggregation of Revenue [Line Items]
Other revenues	18	20	64	35
SOUTHERN Co GAS \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0

Revenue from Contracts with C_4

Revenue from Contracts with Customers and Lease Income - Schedule of Contract Balances (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Accounts Receivable	$ 2,423	$ 3,123
Contract Assets	167	156
Contract Liabilities	73	45
ALABAMA POWER CO
Disaggregation of Revenue [Line Items]
Accounts Receivable	670	696
Contract Assets	0	2
Contract Liabilities	1	4
GEORGIA POWER CO
Disaggregation of Revenue [Line Items]
Accounts Receivable	986	922
Contract Assets	73	89
Contract Liabilities	28	9
MISSISSIPPI POWER CO
Disaggregation of Revenue [Line Items]
Accounts Receivable	101	92
Contract Assets	0	0
Contract Liabilities	3	0
SOUTHERN POWER CO
Disaggregation of Revenue [Line Items]
Accounts Receivable	126	237
Contract Assets	0	0
Contract Liabilities	1	1
SOUTHERN Co GAS
Disaggregation of Revenue [Line Items]
Accounts Receivable	461	1,107
Contract Assets	30	0
Contract Liabilities	$ 0	$ 0

Revenue from Contracts with C_5

Revenue from Contracts with Customers and Lease Income - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Contract liabilities	$ 73	$ 73	$ 45
Contract assets	167	167	156
GEORGIA POWER CO
Disaggregation of Revenue [Line Items]
Contract liabilities	28	28	9
Contract assets	73	73	89
Revenue from contracts with customers recognized	0	0
SOUTHERN Co GAS
Disaggregation of Revenue [Line Items]
Contract liabilities	0	0	0
Contract assets	30	30	0
Revenue from contracts with customers recognized	0	0
ALABAMA POWER CO
Disaggregation of Revenue [Line Items]
Contract liabilities	1	1	4
Contract assets	0	0	2
Revenue from contracts with customers recognized	0	0
MISSISSIPPI POWER CO
Disaggregation of Revenue [Line Items]
Contract liabilities	3	3	0
Contract assets	0	0	0
Revenue from contracts with customers recognized	0	0
SOUTHERN POWER CO
Disaggregation of Revenue [Line Items]
Contract liabilities	1	1	1
Contract assets	0	0	0
Revenue from contracts with customers recognized	0	$ 0
Retail Customer Fixed Bill Programs \| GEORGIA POWER CO
Disaggregation of Revenue [Line Items]
Contract term		1 year
Energy Efficiency Enhancement And Upgrade \| SOUTHERN Co GAS
Disaggregation of Revenue [Line Items]
Contract liabilities	41	$ 41
Unregulated Distributed Generation
Disaggregation of Revenue [Line Items]
Contract liabilities	42	42	32
Contract assets	$ 64	$ 64	$ 65

Revenue from Contracts with C_6

Revenue from Contracts with Customers and Lease Income - Schedule of Remaining Performance Obligations (Details) $ in Millions	Jun. 30, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 333
Performance obligation, expected timing of satisfaction	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 544
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 351
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 316
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 319
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 2,089
Performance obligation, expected timing of satisfaction
ALABAMA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 11
Performance obligation, expected timing of satisfaction	9 months
ALABAMA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 8
Performance obligation, expected timing of satisfaction	1 year
ALABAMA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 7
Performance obligation, expected timing of satisfaction	1 year
ALABAMA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Performance obligation, expected timing of satisfaction	1 year
ALABAMA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Performance obligation, expected timing of satisfaction	1 year
ALABAMA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Performance obligation, expected timing of satisfaction
GEORGIA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 43
Performance obligation, expected timing of satisfaction	9 months
GEORGIA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 58
Performance obligation, expected timing of satisfaction	1 year
GEORGIA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 28
Performance obligation, expected timing of satisfaction	1 year
GEORGIA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 14
Performance obligation, expected timing of satisfaction	1 year
GEORGIA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 14
Performance obligation, expected timing of satisfaction	1 year
GEORGIA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 23
Performance obligation, expected timing of satisfaction
SOUTHERN POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 188
Performance obligation, expected timing of satisfaction	9 months
SOUTHERN POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 358
Performance obligation, expected timing of satisfaction	1 year
SOUTHERN POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 302
Performance obligation, expected timing of satisfaction	1 year
SOUTHERN POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 303
Performance obligation, expected timing of satisfaction	1 year
SOUTHERN POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 310
Performance obligation, expected timing of satisfaction	1 year
SOUTHERN POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 2,077
Performance obligation, expected timing of satisfaction
SOUTHERN Co GAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 11
Performance obligation, expected timing of satisfaction	9 months
SOUTHERN Co GAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 29
Performance obligation, expected timing of satisfaction	1 year
SOUTHERN Co GAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Performance obligation, expected timing of satisfaction	1 year
SOUTHERN Co GAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Performance obligation, expected timing of satisfaction	1 year
SOUTHERN Co GAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Performance obligation, expected timing of satisfaction	1 year
SOUTHERN Co GAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 0
Performance obligation, expected timing of satisfaction

Revenue from Contracts with C_7

Revenue from Contracts with Customers and Lease Income - Schedule of Lease Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	$ 6	$ 7	$ 12	$ 13
Lease income - operating leases	42	52	92	105
Variable lease income	123	129	192	211
Total lease income	171	188	296	329
ALABAMA POWER CO
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	0	0	0	0
Lease income - operating leases	11	19	29	39
Variable lease income	0	0	0	0
Total lease income	11	19	29	39
GEORGIA POWER CO
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	0	0	0	0
Lease income - operating leases	7	8	14	16
Variable lease income	0	0	0	0
Total lease income	7	8	14	16
MISSISSIPPI POWER CO
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	4	4	7	8
Lease income - operating leases	1	0	2	1
Variable lease income	0	0	0	0
Total lease income	5	4	9	9
SOUTHERN POWER CO
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	2	3	5	5
Lease income - operating leases	21	21	42	42
Variable lease income	132	138	207	227
Total lease income	155	162	254	274
SOUTHERN Co GAS
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	0	0	0	0
Lease income - operating leases	9	9	18	18
Variable lease income	0	0	0	0
Total lease income	$ 9	$ 9	$ 18	$ 18

Consolidated Entities and Equ_3

Consolidated Entities and Equity Method Investments - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2023 USD ($)	Jun. 30, 2023 USD ($) investor	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries		$ 1,382	$ 1,443
Assets		137,116	134,891
Liabilities		102,468	100,359
Southern Holdings Company
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries		122	112
SOUTHERN POWER CO
Schedule of Equity Method Investments [Line Items]
Equity investments in unconsolidated subsidiaries		0	49
Assets			13,081
Liabilities		$ 6,199	6,165
Proceeds from sale of equity method investments	$ 50
SP Solar Holdings I, LP \| SOUTHERN POWER CO
Schedule of Equity Method Investments [Line Items]
Distribution made to limited partner, cash distributions paid, percentage		67%
SP Solar Holdings I, LP \| Global Atlantic
Schedule of Equity Method Investments [Line Items]
Distribution made to limited partner, cash distributions paid, percentage		33%
Variable Interest Entity, Primary Beneficiary \| SP Solar Holdings I, LP \| SOUTHERN POWER CO
Schedule of Equity Method Investments [Line Items]
Assets		$ 5,800	5,900
Liabilities		400
Noncontrolling interests related to other partners' interests		1,000	1,100
Variable Interest Entity, Primary Beneficiary \| SP Wind \| SOUTHERN POWER CO
Schedule of Equity Method Investments [Line Items]
Assets		2,200
Liabilities		175	169
Noncontrolling interests related to other partners' interests		$ 39
Distribution made to limited partner, cash distributions paid, percentage		60%
Number of financial investors \| investor		3
Variable Interest Entity, Primary Beneficiary \| SP Wind \| Financial Investors
Schedule of Equity Method Investments [Line Items]
Distribution made to limited partner, cash distributions paid, percentage		40%
Variable Interest Entity, Primary Beneficiary \| Other Variable Interest Entities \| SOUTHERN POWER CO
Schedule of Equity Method Investments [Line Items]
Assets		$ 1,700	$ 1,800
Liabilities		200
Noncontrolling interests related to other partners' interests		$ 800

Consolidated Entities and Equ_4

Consolidated Entities and Equity Method Investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 1,382	$ 1,443
SOUTHERN Co GAS
Schedule of Equity Method Investments [Line Items]
Investment Balance	1,252	1,276
SOUTHERN Co GAS \| SNG
Schedule of Equity Method Investments [Line Items]
Investment Balance	1,220	1,243
SOUTHERN Co GAS \| Other
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 32	$ 33

Consolidated Entities and Equ_5

Consolidated Entities and Equity Method Investments - Schedule of Earnings (Loss) from Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule of Equity Method Investments [Line Items]
Earnings from Equity Method Investments	$ 29	$ 34	$ 78	$ 80
SOUTHERN Co GAS
Schedule of Equity Method Investments [Line Items]
Earnings from Equity Method Investments	28	31	72	71
SOUTHERN Co GAS \| SNG
Schedule of Equity Method Investments [Line Items]
Earnings from Equity Method Investments	28	31	72	70
SOUTHERN Co GAS \| Other
Schedule of Equity Method Investments [Line Items]
Earnings from Equity Method Investments	$ 0	$ 0	$ 0	$ 1

Financing and Leases - Schedule

Financing and Leases - Schedule of Credit Arrangements (Details) - USD ($) $ in Millions	Jun. 30, 2023	May 31, 2023	Apr. 30, 2023
Line of Credit Facility [Line Items]
Expires, 2024	$ 830
Expires, 2025	125
Expires, 2026	150
Expires, 2028	6,400
Total	7,505
Unused	7,466
Expires within One Year	280
Southern Company parent(a)
Line of Credit Facility [Line Items]
Expires, 2024	150
Expires, 2025	0
Expires, 2026	0
Expires, 2028	1,850	$ 1,850
Total	2,000	150
Unused	1,998
Expires within One Year	150
ALABAMA POWER CO
Line of Credit Facility [Line Items]
Expires, 2024	550
Expires, 2025	0
Expires, 2026	0
Expires, 2028	700
Total	1,250
Unused	1,250
Expires within One Year	0
GEORGIA POWER CO
Line of Credit Facility [Line Items]
Expires, 2024	0
Expires, 2025	0
Expires, 2026	0
Expires, 2028	1,750
Total	1,750
Unused	1,726
Expires within One Year	0
MISSISSIPPI POWER CO
Line of Credit Facility [Line Items]
Expires, 2024	0
Expires, 2025	125
Expires, 2026	150
Expires, 2028	0
Total	275	150
Unused	275
Expires within One Year	0
SOUTHERN POWER CO
Line of Credit Facility [Line Items]
Expires, 2024	0
Expires, 2025	0
Expires, 2026	0
Expires, 2028	600	600
Total	600
Unused	589
Expires within One Year	0
SOUTHERN POWER CO \| Continuing Letter of Credit Facility A
Line of Credit Facility [Line Items]
Expires, 2025	75
Expires, 2026	100
Unused	9
SOUTHERN POWER CO \| Continuing Letter of Credit Facility B
Line of Credit Facility [Line Items]
Unused	16
SOUTHERN Co GAS
Line of Credit Facility [Line Items]
Expires, 2024	100
Expires, 2025	0
Expires, 2026	0
Expires, 2028	1,500
Total	1,600
Unused	1,598
Expires within One Year	100
Expires, 2023	100
SEGCO
Line of Credit Facility [Line Items]
Expires, 2024	30
Expires, 2025	0
Expires, 2026	0
Expires, 2028	0
Total	30
Unused	30
Expires within One Year	30
Southern Company and Southern Power
Line of Credit Facility [Line Items]
Expires, 2028	2,450	2,450
Southern Company Gas Capital
Line of Credit Facility [Line Items]
Expires, 2028	800
Nicor Gas
Line of Credit Facility [Line Items]
Expires, 2028	$ 700
Total		$ 100	$ 250

Financing and Leases - Narrativ

Financing and Leases - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	May 31, 2023	Apr. 30, 2023
Debt Instrument [Line Items]
Expires, 2028	$ 6,400
Line of credit facility, maximum borrowing capacity	7,505
Variable rate pollution control revenue bonds outstanding	1,400
Southern Company parent(a)
Debt Instrument [Line Items]
Expires, 2028	1,850	$ 1,850
Line of credit facility, maximum borrowing capacity	2,000	150
MISSISSIPPI POWER CO
Debt Instrument [Line Items]
Expires, 2028	0
Line of credit facility, maximum borrowing capacity	275	150
Variable rate pollution control revenue bonds outstanding	69
Nicor Gas
Debt Instrument [Line Items]
Expires, 2028	700
Line of credit facility, maximum borrowing capacity		100	$ 250
ALABAMA POWER CO
Debt Instrument [Line Items]
Expires, 2028	700
Line of credit facility, maximum borrowing capacity	1,250
Variable rate pollution control revenue bonds outstanding	492
Fixed rate pollution control revenue bonds outstanding	120
GEORGIA POWER CO
Debt Instrument [Line Items]
Expires, 2028	1,750
Line of credit facility, maximum borrowing capacity	1,750
Variable rate pollution control revenue bonds outstanding	819
Fixed rate pollution control revenue bonds outstanding	225
Southern Company and Southern Power
Debt Instrument [Line Items]
Expires, 2028	2,450	2,450
SOUTHERN POWER CO
Debt Instrument [Line Items]
Expires, 2028	600	$ 600
Line of credit facility, maximum borrowing capacity	$ 600

Financing and Leases - Converti

Financing and Leases - Convertible Senior Notes (Details) - Series 2023A Convertible Senior Notes Due 2025 - Convertible Debt $ / shares in Units, $ in Millions		1 Months Ended
	Feb. 28, 2023 USD ($) $ / shares	Feb. 28, 2023 USD ($) d $ / shares	Mar. 31, 2023 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount \| $	$ 1,500	$ 1,500	$ 225
Interest rate	3.875%	3.875%
Conversion ratio		0.0118818
Conversion price (in dollars per share) \| $ / shares	$ 84.16	$ 84.16
Redemption price	100%
Debt Conversion Terms One
Debt Instrument [Line Items]
Trading day threshold		20
Consecutive trading day threshold		30
Stock price trigger threshold, percentage		130%
Debt Conversion Terms Two
Debt Instrument [Line Items]
Trading day threshold		5
Consecutive trading day threshold		10
Stock price trigger threshold, percentage		98%

Financing and Leases - Schedu_2

Financing and Leases - Schedule of Shares Used to Compute Diluted Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Disclosure [Abstract]
As reported shares (in shares)	1,092,000	1,065,000	1,092,000	1,064,000
Effect of stock-based compensation (in shares)	6,000	5,000	6,000	5,000
Effect of equity units (in shares)	0	2,000	0	1,000
Diluted (in shares)	1,098,000	1,072,000	1,098,000	1,070,000
Antidilutive securities excluded from computation of earnings per share (in shares)	0	0	0	0

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	10.70%	18.70%
ALABAMA POWER CO
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	3.90%	23.60%
GEORGIA POWER CO
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	15.80%	16.40%
Unrecognized tax positions	$ 48
SOUTHERN POWER CO
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	(0.70%)	11.20%
Southern Company parent(a)
Income Tax Contingency [Line Items]
Unrecognized tax positions	$ 130		$ 80
MISSISSIPPI POWER CO
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	15.20%	18.80%

Retirement Benefits (Details)

Retirement Benefits (Details) - USD ($)	3 Months Ended		6 Months Ended
Retirement Benefits (Details) - USD ($)	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future employer contributions, remainder of fiscal year	$ 0		$ 0
Pension Plans and Postretirement Plans
Service cost	69,000,000	$ 103,000,000	138,000,000	$ 206,000,000
Interest cost	157,000,000	102,000,000	313,000,000	204,000,000
Expected return on plan assets	(308,000,000)	(317,000,000)	(615,000,000)	(633,000,000)
Amortization:
Prior service costs	0	0	0	0
Regulatory asset	0	0	0	0
Net (gain) loss	8,000,000	60,000,000	16,000,000	120,000,000
Net periodic pension income	(74,000,000)	(52,000,000)	(148,000,000)	(103,000,000)
Pension Plans \| ALABAMA POWER CO
Pension Plans and Postretirement Plans
Service cost	16,000,000	24,000,000	32,000,000	49,000,000
Interest cost	36,000,000	24,000,000	72,000,000	48,000,000
Expected return on plan assets	(74,000,000)	(75,000,000)	(148,000,000)	(152,000,000)
Amortization:
Prior service costs	0	0	0	0
Regulatory asset	0	0	0	0
Net (gain) loss	3,000,000	15,000,000	5,000,000	31,000,000
Net periodic pension income	(19,000,000)	(12,000,000)	(39,000,000)	(24,000,000)
Pension Plans \| GEORGIA POWER CO
Pension Plans and Postretirement Plans
Service cost	17,000,000	26,000,000	34,000,000	52,000,000
Interest cost	47,000,000	30,000,000	95,000,000	61,000,000
Expected return on plan assets	(96,000,000)	(100,000,000)	(192,000,000)	(199,000,000)
Amortization:
Prior service costs	1,000,000	1,000,000	1,000,000	1,000,000
Regulatory asset	0	0	0	0
Net (gain) loss	3,000,000	19,000,000	6,000,000	37,000,000
Net periodic pension income	(28,000,000)	(24,000,000)	(56,000,000)	(48,000,000)
Pension Plans \| MISSISSIPPI POWER CO
Pension Plans and Postretirement Plans
Service cost	3,000,000	4,000,000	6,000,000	8,000,000
Interest cost	7,000,000	4,000,000	14,000,000	9,000,000
Expected return on plan assets	(14,000,000)	(14,000,000)	(28,000,000)	(29,000,000)
Amortization:
Prior service costs	0	0	0	0
Regulatory asset	0	0	0	0
Net (gain) loss	0	4,000,000	0	7,000,000
Net periodic pension income	(4,000,000)	(2,000,000)	(8,000,000)	(5,000,000)
Pension Plans \| SOUTHERN POWER CO
Pension Plans and Postretirement Plans
Service cost	1,000,000	3,000,000	3,000,000	5,000,000
Interest cost	2,000,000	1,000,000	4,000,000	3,000,000
Expected return on plan assets	(4,000,000)	(4,000,000)	(8,000,000)	(8,000,000)
Amortization:
Prior service costs	0	0	0	0
Regulatory asset	0	0	0	0
Net (gain) loss	0	0	0	1,000,000
Net periodic pension income	(1,000,000)	0	(1,000,000)	1,000,000
Pension Plans \| SOUTHERN Co GAS
Pension Plans and Postretirement Plans
Service cost	6,000,000	8,000,000	12,000,000	17,000,000
Interest cost	11,000,000	7,000,000	21,000,000	14,000,000
Expected return on plan assets	(22,000,000)	(24,000,000)	(44,000,000)	(46,000,000)
Amortization:
Prior service costs	(1,000,000)	0	(1,000,000)	(1,000,000)
Regulatory asset	4,000,000	4,000,000	8,000,000	8,000,000
Net (gain) loss	(1,000,000)	1,000,000	(2,000,000)	3,000,000
Net periodic pension income	(3,000,000)	(4,000,000)	(6,000,000)	(5,000,000)
Postretirement Benefits
Pension Plans and Postretirement Plans
Service cost	3,000,000	5,000,000	7,000,000	11,000,000
Interest cost	17,000,000	11,000,000	35,000,000	21,000,000
Expected return on plan assets	(20,000,000)	(20,000,000)	(41,000,000)	(40,000,000)
Amortization:
Prior service costs	1,000,000		1,000,000
Regulatory asset	0	0	0	0
Net (gain) loss	(3,000,000)	0	(6,000,000)	0
Net periodic pension income	(2,000,000)	(4,000,000)	(4,000,000)	(8,000,000)
Postretirement Benefits \| ALABAMA POWER CO
Pension Plans and Postretirement Plans
Service cost	1,000,000	2,000,000	2,000,000	3,000,000
Interest cost	4,000,000	2,000,000	8,000,000	5,000,000
Expected return on plan assets	(9,000,000)	(8,000,000)	(17,000,000)	(16,000,000)
Amortization:
Prior service costs	0		0
Regulatory asset	0	0	0	0
Net (gain) loss	0	0	(1,000,000)	0
Net periodic pension income	(4,000,000)	(4,000,000)	(8,000,000)	(8,000,000)
Postretirement Benefits \| GEORGIA POWER CO
Pension Plans and Postretirement Plans
Service cost	1,000,000	1,000,000	2,000,000	3,000,000
Interest cost	7,000,000	3,000,000	13,000,000	7,000,000
Expected return on plan assets	(8,000,000)	(6,000,000)	(15,000,000)	(13,000,000)
Amortization:
Prior service costs	0		0
Regulatory asset	0	0	0	0
Net (gain) loss	(1,000,000)	1,000,000	(2,000,000)	1,000,000
Net periodic pension income	(1,000,000)	(1,000,000)	(2,000,000)	(2,000,000)
Postretirement Benefits \| MISSISSIPPI POWER CO
Pension Plans and Postretirement Plans
Service cost	0	0	0	0
Interest cost	1,000,000	1,000,000	2,000,000	1,000,000
Expected return on plan assets	0	(1,000,000)	(1,000,000)	(1,000,000)
Amortization:
Prior service costs	0		0
Regulatory asset	0	0	0	0
Net (gain) loss	0	0	0	0
Net periodic pension income	1,000,000	0	1,000,000	0
Postretirement Benefits \| SOUTHERN POWER CO
Pension Plans and Postretirement Plans
Service cost	0	0	0	0
Interest cost	0	0	0	0
Expected return on plan assets	0	0	0	0
Amortization:
Prior service costs	0		0
Regulatory asset	0	0	0	0
Net (gain) loss	0	0	0	0
Net periodic pension income	0	0	0	0
Postretirement Benefits \| SOUTHERN Co GAS
Pension Plans and Postretirement Plans
Service cost	0	0	0	1,000,000
Interest cost	2,000,000	1,000,000	4,000,000	2,000,000
Expected return on plan assets	(2,000,000)	(1,000,000)	(3,000,000)	(3,000,000)
Amortization:
Prior service costs	0		0
Regulatory asset	2,000,000	1,000,000	3,000,000	3,000,000
Net (gain) loss	(1,000,000)	0	(2,000,000)	(1,000,000)
Net periodic pension income	$ 1,000,000	$ 1,000,000	$ 2,000,000	$ 2,000,000

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets:
Derivatives	$ 57	$ 141
Liabilities:
Derivatives	693	617
Other	13
Collateral already posted, assets, aggregate fair value	52
Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Other	0
Significant Other Observable Inputs (Level 2)
Liabilities:
Other	13
Significant Unobservable Inputs (Level 3)
Liabilities:
Other	0
ALABAMA POWER CO
Assets:
Derivatives	12	38
Liabilities:
Derivatives	64	15
Collateral already posted, assets, aggregate fair value	0
GEORGIA POWER CO
Assets:
Derivatives	5	21
Investments in trusts	25
Liabilities:
Derivatives	90	41
MISSISSIPPI POWER CO
Assets:
Derivatives	8	42
Liabilities:
Derivatives	36	15
SOUTHERN POWER CO
Assets:
Derivatives	3	8
Liabilities:
Derivatives	37	59
Other	13
Collateral already posted, assets, aggregate fair value	15
SOUTHERN POWER CO \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Other	0
SOUTHERN POWER CO \| Significant Other Observable Inputs (Level 2)
Liabilities:
Other	13
SOUTHERN POWER CO \| Significant Unobservable Inputs (Level 3)
Liabilities:
Other	0
SOUTHERN Co GAS
Assets:
Derivatives	31	28
Liabilities:
Derivatives	110	110
Total
Collateral already posted, assets, aggregate fair value	52	$ 41
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	1,506
Other investments	51
Total	3,966
Liabilities:
Contingent consideration	12
Total	810
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	1,494
Other investments	9
Total	2,401
Liabilities:
Contingent consideration	0
Total	33
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	12
Other investments	34
Total	1,382
Liabilities:
Contingent consideration	0
Total	765
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0
Other investments	8
Total	8
Liabilities:
Contingent consideration	12
Total	12
Fair Value, Measurements, Recurring \| Net Asset Value as a Practical Expedient (NAV)
Assets:
Total	175
Fair Value, Measurements, Recurring \| Energy-related derivatives
Assets:
Derivatives	93
Liabilities:
Derivatives	311
Fair Value, Measurements, Recurring \| Energy-related derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	7
Liabilities:
Derivatives	33
Fair Value, Measurements, Recurring \| Energy-related derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	86
Liabilities:
Derivatives	278
Fair Value, Measurements, Recurring \| Energy-related derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| Interest rate derivatives
Assets:
Derivatives	4
Liabilities:
Derivatives	304
Fair Value, Measurements, Recurring \| Interest rate derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| Interest rate derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	4
Liabilities:
Derivatives	304
Fair Value, Measurements, Recurring \| Interest rate derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| Domestic equity
Assets:
Investments in trusts	923
Fair Value, Measurements, Recurring \| Domestic equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	718
Fair Value, Measurements, Recurring \| Domestic equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	205
Fair Value, Measurements, Recurring \| Domestic equity \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Foreign equity
Assets:
Investments in trusts	307
Fair Value, Measurements, Recurring \| Foreign equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	140
Fair Value, Measurements, Recurring \| Foreign equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	167
Fair Value, Measurements, Recurring \| Foreign equity \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| U.S. Treasury and government agency securities
Assets:
Investments in trusts	333
Fair Value, Measurements, Recurring \| U.S. Treasury and government agency securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| U.S. Treasury and government agency securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	333
Fair Value, Measurements, Recurring \| U.S. Treasury and government agency securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Municipal bonds
Assets:
Investments in trusts	46
Fair Value, Measurements, Recurring \| Municipal bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Municipal bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	46
Fair Value, Measurements, Recurring \| Municipal bonds \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Pooled funds – fixed income
Assets:
Investments in trusts	7
Fair Value, Measurements, Recurring \| Pooled funds – fixed income \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Pooled funds – fixed income \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	7
Fair Value, Measurements, Recurring \| Pooled funds – fixed income \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Corporate bonds
Assets:
Investments in trusts	391
Fair Value, Measurements, Recurring \| Corporate bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Corporate bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	391
Fair Value, Measurements, Recurring \| Corporate bonds \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Mortgage and asset backed securities
Assets:
Investments in trusts	90
Fair Value, Measurements, Recurring \| Mortgage and asset backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Mortgage and asset backed securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	90
Fair Value, Measurements, Recurring \| Mortgage and asset backed securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Private equity
Assets:
Investments in trusts	166
Fair Value, Measurements, Recurring \| Private equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Private equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Private equity \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Private equity \| Net Asset Value as a Practical Expedient (NAV)
Assets:
Investments in trusts	166
Fair Value, Measurements, Recurring \| Cash and cash equivalents
Assets:
Investments in trusts	2
Fair Value, Measurements, Recurring \| Cash and cash equivalents \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	2
Fair Value, Measurements, Recurring \| Cash and cash equivalents \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Cash and cash equivalents \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Other
Assets:
Investments in trusts	47
Fair Value, Measurements, Recurring \| Other \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	31
Fair Value, Measurements, Recurring \| Other \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	7
Fair Value, Measurements, Recurring \| Other \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Other \| Net Asset Value as a Practical Expedient (NAV)
Assets:
Investments in trusts	9
Fair Value, Measurements, Recurring \| Foreign currency derivatives
Liabilities:
Derivatives	170
Fair Value, Measurements, Recurring \| Foreign currency derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| Foreign currency derivatives \| Significant Other Observable Inputs (Level 2)
Liabilities:
Derivatives	170
Fair Value, Measurements, Recurring \| Foreign currency derivatives \| Significant Unobservable Inputs (Level 3)
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO
Assets:
Cash equivalents	122
Other investments	34
Total	1,391
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	110
Other investments	0
Total	677
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	12
Other investments	34
Total	539
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0
Other investments	0
Total	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Net Asset Value as a Practical Expedient (NAV)
Assets:
Total	175
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Energy-related derivatives
Assets:
Derivatives	32
Liabilities:
Derivatives	84
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Energy-related derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Energy-related derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	32
Liabilities:
Derivatives	84
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Energy-related derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Domestic equity
Assets:
Investments in trusts	618
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Domestic equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	420
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Domestic equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	198
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Domestic equity \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Foreign equity
Assets:
Investments in trusts	140
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Foreign equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	140
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Foreign equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Foreign equity \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| U.S. Treasury and government agency securities
Assets:
Investments in trusts	20
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| U.S. Treasury and government agency securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| U.S. Treasury and government agency securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	20
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| U.S. Treasury and government agency securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Municipal bonds
Assets:
Investments in trusts	1
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Municipal bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Municipal bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	1
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Municipal bonds \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Corporate bonds
Assets:
Investments in trusts	221
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Corporate bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Corporate bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	221
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Corporate bonds \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Mortgage and asset backed securities
Assets:
Investments in trusts	21
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Mortgage and asset backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Mortgage and asset backed securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	21
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Mortgage and asset backed securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Private equity
Assets:
Investments in trusts	166
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Private equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Private equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Private equity \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Private equity \| Net Asset Value as a Practical Expedient (NAV)
Assets:
Investments in trusts	166
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Other
Assets:
Investments in trusts	16
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Other \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	7
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Other \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Other \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Other \| Net Asset Value as a Practical Expedient (NAV)
Assets:
Investments in trusts	9
Fair Value, Measurements, Recurring \| GEORGIA POWER CO
Assets:
Total	1,110
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total	322
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Significant Other Observable Inputs (Level 2)
Assets:
Total	788
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Significant Unobservable Inputs (Level 3)
Assets:
Total	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Energy-related derivatives
Assets:
Derivatives	17
Liabilities:
Derivatives	102
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Energy-related derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Energy-related derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	17
Liabilities:
Derivatives	102
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Energy-related derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Domestic equity
Assets:
Investments in trusts	299
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Domestic equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	298
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Domestic equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	1
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Domestic equity \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Foreign equity
Assets:
Investments in trusts	166
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Foreign equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Foreign equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	166
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Foreign equity \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| U.S. Treasury and government agency securities
Assets:
Investments in trusts	313
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| U.S. Treasury and government agency securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| U.S. Treasury and government agency securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	313
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| U.S. Treasury and government agency securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Municipal bonds
Assets:
Investments in trusts	45
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Municipal bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Municipal bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	45
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Municipal bonds \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Corporate bonds
Assets:
Investments in trusts	170
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Corporate bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Corporate bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	170
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Corporate bonds \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Mortgage and asset backed securities
Assets:
Investments in trusts	69
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Mortgage and asset backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Mortgage and asset backed securities \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	69
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Mortgage and asset backed securities \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Other
Assets:
Investments in trusts	31
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Other \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	24
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Other \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	7
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Other \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| MISSISSIPPI POWER CO \| Energy-related derivatives
Assets:
Derivatives	27
Liabilities:
Derivatives	55
Fair Value, Measurements, Recurring \| MISSISSIPPI POWER CO \| Energy-related derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| MISSISSIPPI POWER CO \| Energy-related derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	27
Liabilities:
Derivatives	55
Fair Value, Measurements, Recurring \| MISSISSIPPI POWER CO \| Energy-related derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO
Assets:
Cash equivalents	5
Total	9
Liabilities:
Contingent consideration	12
Total	63
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	5
Total	5
Liabilities:
Contingent consideration	0
Total	0
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	0
Total	4
Liabilities:
Contingent consideration	0
Total	51
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0
Total	0
Liabilities:
Contingent consideration	12
Total	12
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Energy-related derivatives
Assets:
Derivatives	4
Liabilities:
Derivatives	10
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Energy-related derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Energy-related derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	4
Liabilities:
Derivatives	10
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Energy-related derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Foreign currency derivatives
Liabilities:
Derivatives	28
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Foreign currency derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Foreign currency derivatives \| Significant Other Observable Inputs (Level 2)
Liabilities:
Derivatives	28
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Foreign currency derivatives \| Significant Unobservable Inputs (Level 3)
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS
Assets:
Cash equivalents	215
Total	248
Liabilities:
Total	148
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	215
Total	224
Liabilities:
Total	33
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	0
Total	24
Liabilities:
Total	115
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0
Total	0
Liabilities:
Total	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Energy-related derivatives
Assets:
Derivatives	13
Liabilities:
Derivatives	60
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Energy-related derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	7
Liabilities:
Derivatives	33
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Energy-related derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	6
Liabilities:
Derivatives	27
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Energy-related derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Interest rate derivatives
Assets:
Derivatives	4
Liabilities:
Derivatives	88
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Interest rate derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Interest rate derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	4
Liabilities:
Derivatives	88
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Interest rate derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Domestic equity
Assets:
Non-qualified deferred compensation trusts	6
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Domestic equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Non-qualified deferred compensation trusts	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Domestic equity \| Significant Other Observable Inputs (Level 2)
Assets:
Non-qualified deferred compensation trusts	6
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Domestic equity \| Significant Unobservable Inputs (Level 3)
Assets:
Non-qualified deferred compensation trusts	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Foreign equity
Assets:
Non-qualified deferred compensation trusts	1
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Foreign equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Non-qualified deferred compensation trusts	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Foreign equity \| Significant Other Observable Inputs (Level 2)
Assets:
Non-qualified deferred compensation trusts	1
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Foreign equity \| Significant Unobservable Inputs (Level 3)
Assets:
Non-qualified deferred compensation trusts	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Pooled funds – fixed income
Assets:
Non-qualified deferred compensation trusts	7
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Pooled funds – fixed income \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Non-qualified deferred compensation trusts	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Pooled funds – fixed income \| Significant Other Observable Inputs (Level 2)
Assets:
Non-qualified deferred compensation trusts	7
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Pooled funds – fixed income \| Significant Unobservable Inputs (Level 3)
Assets:
Non-qualified deferred compensation trusts	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Cash equivalents
Assets:
Non-qualified deferred compensation trusts	2
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Cash equivalents \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Non-qualified deferred compensation trusts	2
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Cash equivalents \| Significant Other Observable Inputs (Level 2)
Assets:
Non-qualified deferred compensation trusts	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Cash equivalents \| Significant Unobservable Inputs (Level 3)
Assets:
Non-qualified deferred compensation trusts	$ 0

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Increase (Decrease) In Fair Value Of Funds (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]
Increase (decrease) in fair value of funds	$ 132	$ (230)	$ 228	$ (380)
ALABAMA POWER CO
Fair Value, Option, Quantitative Disclosures [Line Items]
Increase (decrease) in fair value of funds	58	(125)	103	(192)
GEORGIA POWER CO
Fair Value, Option, Quantitative Disclosures [Line Items]
Increase (decrease) in fair value of funds	$ 74	$ (105)	$ 125	$ (188)

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - ALABAMA POWER CO - Private equity $ in Millions	Jun. 30, 2023 USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value	$ 175
Unfunded commitments	$ 77

Fair Value Measurements - Sch_3

Fair Value Measurements - Schedule of Financial Instruments for which Carrying Amount did not Equal Fair Value (Details) $ in Billions	Jun. 30, 2023 USD ($)
Long-term debt, including securities due within one year:
Carrying amount	$ 58.9
Fair value	53.5
ALABAMA POWER CO
Long-term debt, including securities due within one year:
Carrying amount	10.8
Fair value	9.5
GEORGIA POWER CO
Long-term debt, including securities due within one year:
Carrying amount	16.5
Fair value	15
MISSISSIPPI POWER CO
Long-term debt, including securities due within one year:
Carrying amount	1.6
Fair value	1.4
SOUTHERN POWER CO
Long-term debt, including securities due within one year:
Carrying amount	3
Fair value	2.8
SOUTHERN Co GAS
Long-term debt, including securities due within one year:
Carrying amount	7.5
Fair value	$ 6.6

Derivatives - Schedule of Energ

Derivatives - Schedule of Energy-Related Derivatives (Details) - Energy-related, Natural Gas MMBTU in Millions	Jun. 30, 2023 MMBTU
Energy-related derivative contracts
Net Purchased mmBtu	422
ALABAMA POWER CO
Energy-related derivative contracts
Net Purchased mmBtu	108
GEORGIA POWER CO
Energy-related derivative contracts
Net Purchased mmBtu	109
MISSISSIPPI POWER CO
Energy-related derivative contracts
Net Purchased mmBtu	85
SOUTHERN POWER CO
Energy-related derivative contracts
Net Purchased mmBtu	10
SOUTHERN Co GAS
Energy-related derivative contracts
Net Purchased mmBtu	110
SOUTHERN Co GAS \| Energy-related derivatives not designated as hedging instruments \| Long
Energy-related derivative contracts
Derivative nonmonetary notional amount net long short position volume	119.7
SOUTHERN Co GAS \| Energy-related derivatives not designated as hedging instruments \| Short
Energy-related derivative contracts
Derivative nonmonetary notional amount net long short position volume	9.4

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) MMBTU in Millions	3 Months Ended		6 Months Ended
Derivatives - Narrative (Details) MMBTU in Millions	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) MMBTU	Jun. 30, 2022 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU			11
Collateral already posted, assets, aggregate fair value	$ 52,000,000		$ 52,000,000
Derivatives	693,000,000		693,000,000			$ 617,000,000
Gain (Loss) Recognized in OCI on Derivatives	36,000,000	$ (61,000,000)	(50,000,000)	$ (34,000,000)
Scenario, Forecast
Derivative [Line Items]
Energy-related derivative hedge gain (loss) to be reclassified within twelve months					$ 33,000,000
Interest rate derivatives
Derivative [Line Items]
Derivatives	65,000,000		65,000,000
Interest rate derivatives \| Scenario, Forecast
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					(15,000,000)
Interest rate derivatives \| Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	3,000,000	21,000,000	(10,000,000)	30,000,000
Energy-related derivatives \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	16,000,000	(40,000,000)	29,000,000	(18,000,000)
Energy-related derivatives \| Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	(5,000,000)	(1,000,000)	$ (50,000,000)	41,000,000
SOUTHERN POWER CO
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU			3
Foreign currency cash flow hedge gain (loss to be reclassified	11,000,000		$ 11,000,000
Collateral already posted, assets, aggregate fair value	15,000,000		15,000,000
Derivatives	37,000,000		37,000,000			59,000,000
Gain (Loss) Recognized in OCI on Derivatives	6,000,000	(72,000,000)	(4,000,000)	(95,000,000)
SOUTHERN POWER CO \| Scenario, Forecast
Derivative [Line Items]
Energy-related derivative hedge gain (loss) to be reclassified within twelve months					9,000,000
SOUTHERN POWER CO \| Interest rate derivatives
Derivative [Line Items]
Derivatives	13,000,000		13,000,000
SOUTHERN POWER CO \| Interest rate derivatives \| Scenario, Forecast
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					0
SOUTHERN POWER CO \| Energy-related derivatives \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	0	0	0	0
SOUTHERN POWER CO \| Energy-related derivatives \| Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	(2,000,000)	2,000,000	(13,000,000)	7,000,000
SOUTHERN Co GAS
Derivative [Line Items]
Collateral already posted, assets, aggregate fair value	52,000,000		52,000,000			41,000,000
Derivatives	110,000,000		110,000,000			110,000,000
Gain (Loss) Recognized in OCI on Derivatives	0	(7,000,000)	(33,000,000)	30,000,000
SOUTHERN Co GAS \| Scenario, Forecast
Derivative [Line Items]
Energy-related derivative hedge gain (loss) to be reclassified within twelve months					24,000,000
SOUTHERN Co GAS \| Interest rate derivatives \| Scenario, Forecast
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					0
SOUTHERN Co GAS \| Interest rate derivatives \| Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	3,000,000	(5,000,000)	4,000,000	(5,000,000)
SOUTHERN Co GAS \| Energy-related derivatives \| Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	(3,000,000)	(2,000,000)	$ (37,000,000)	35,000,000
ALABAMA POWER CO
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU			3
Collateral already posted, assets, aggregate fair value	0		$ 0
Derivatives	64,000,000		64,000,000			15,000,000
ALABAMA POWER CO \| Interest rate derivatives \| Scenario, Forecast
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					0
ALABAMA POWER CO \| Energy-related derivatives \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	0	0	0	0
ALABAMA POWER CO \| Energy-related derivatives \| Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	0	0	$ 0	0
GEORGIA POWER CO
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU			4
Derivatives	90,000,000		$ 90,000,000			41,000,000
GEORGIA POWER CO \| Interest rate derivatives \| Scenario, Forecast
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					0
GEORGIA POWER CO \| Interest rate derivatives \| Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	(1,000,000)	19,000,000	(3,000,000)	31,000,000
GEORGIA POWER CO \| Energy-related derivatives \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	0	0	$ 0	0
MISSISSIPPI POWER CO
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU			1
Derivatives	36,000,000		$ 36,000,000			$ 15,000,000
MISSISSIPPI POWER CO \| Interest rate derivatives \| Scenario, Forecast
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months					$ 0
MISSISSIPPI POWER CO \| Energy-related derivatives \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	0	0	0	0
MISSISSIPPI POWER CO \| Energy-related derivatives \| Cash Flow Hedging
Derivative [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	0	$ 0	0	$ 0
Registrants \| Derivative Counterparties
Derivative [Line Items]
Collateral already posted, assets, aggregate fair value	$ 0		$ 0

Derivatives - Schedule of Inter

Derivatives - Schedule of Interest Rate Derivatives (Details) - Interest rate derivatives $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Derivative [Line Items]
Notional Amount	$ 2,150
Fair Value Gain (Loss)	(300)
Southern Company parent(a) \| Fair Value Hedges of Existing Debt \| March 2028
Derivative [Line Items]
Notional Amount	$ 400
Interest Rate Received	1.75%
Fair Value Gain (Loss)	$ (56)
Southern Company parent(a) \| Fair Value Hedges of Existing Debt \| April 2030
Derivative [Line Items]
Notional Amount	$ 1,000
Interest Rate Received	3.70%
Fair Value Gain (Loss)	$ (160)
SOUTHERN Co GAS \| Cash Flow Hedges of Forecasted Debt
Derivative [Line Items]
Notional Amount	$ 250
Weighted Average Interest Rate Paid	3.40%
Fair Value Gain (Loss)	$ 4
SOUTHERN Co GAS \| Fair Value Hedges of Existing Debt
Derivative [Line Items]
Notional Amount	$ 500
Interest Rate Received	1.75%
Fair Value Gain (Loss)	$ (88)
LIBOR \| Southern Company parent(a) \| Fair Value Hedges of Existing Debt \| March 2028
Derivative [Line Items]
Weighted Average Interest Rate Paid	0.68%
LIBOR \| Southern Company parent(a) \| Fair Value Hedges of Existing Debt \| April 2030
Derivative [Line Items]
Weighted Average Interest Rate Paid	2.36%
LIBOR \| SOUTHERN Co GAS \| Fair Value Hedges of Existing Debt
Derivative [Line Items]
Weighted Average Interest Rate Paid	0.38%

Derivatives - Schedule of Forei

Derivatives - Schedule of Foreign Currency Derivatives (Details) - 6 months ended Jun. 30, 2023 - Foreign currency derivatives € in Millions, $ in Millions	USD ($)	EUR (€)
Derivative [Line Items]
Pay Notional	$ 2,040
Receive Notional \| €		€ 1,750
Fair Value Gain (Loss)	(170)
Cash Flow Hedges of Forecasted Debt \| SOUTHERN POWER CO
Derivative [Line Items]
Pay Notional	$ 564
Pay Rate	3.78%
Receive Notional \| €		500
Receive Rate	1.85%
Fair Value Gain (Loss)	$ (28)
Fair Value Hedges of Existing Debt \| Southern Company parent(a)
Derivative [Line Items]
Pay Notional	$ 1,476
Pay Rate	3.39%
Receive Notional \| €		€ 1,250
Receive Rate	1.88%
Fair Value Gain (Loss)	$ (142)

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Category and Balance Sheet Location (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	$ 97	$ 211
Derivative asset, Gross amounts offset	(40)	(70)
Derivative asset, net amounts recognized in the balance sheets	57	141
Derivative liability, gross amount recognized	785	728
Derivative liability, Gross amounts offset	(92)	(111)
Derivative liability, net amounts recognized in the balance sheets	693	617
Collateral already posted, assets, aggregate fair value	52
Interest rate derivatives
Derivatives, Fair Value [Line Items]
Derivative liability, net amounts recognized in the balance sheets	65
Energy-related derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	7	15
Derivative liability, gross amount recognized	7	14
Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	7	13
Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Liabilities from risk management activities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	7	13
Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	2
Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	0	1
Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	82	175
Derivative liability, gross amount recognized	267	165
Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	46	123
Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Liabilities from risk management activities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	166	121
Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	36	52
Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	101	44
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	8	21
Derivative liability, gross amount recognized	511	549
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	1	3
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Liabilities from risk management activities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	32	27
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	3	6
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	5	4
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Interest rate derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	4	12
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Interest rate derivatives \| Liabilities from risk management activities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	77	62
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Interest rate derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	0
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Interest rate derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	227	240
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	0
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Liabilities from risk management activities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	35	34
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	0
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	135	182
ALABAMA POWER CO
Derivatives, Fair Value [Line Items]
Derivative asset, Gross amounts offset	(20)	(24)
Derivative asset, net amounts recognized in the balance sheets	12	38
Derivative liability, Gross amounts offset	(20)	(24)
Derivative liability, net amounts recognized in the balance sheets	64	15
Collateral already posted, assets, aggregate fair value	0
ALABAMA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	32	62
Derivative liability, gross amount recognized	84	39
ALABAMA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	20	42
ALABAMA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	46	21
ALABAMA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	12	20
ALABAMA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	38	18
GEORGIA POWER CO
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	17	42
Derivative asset, Gross amounts offset	(12)	(21)
Derivative asset, net amounts recognized in the balance sheets	5	21
Derivative liability, gross amount recognized	102	62
Derivative liability, Gross amounts offset	(12)	(21)
Derivative liability, net amounts recognized in the balance sheets	90	41
GEORGIA POWER CO \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	2	0
GEORGIA POWER CO \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	0	1
GEORGIA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	15	42
Derivative liability, gross amount recognized	102	61
GEORGIA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	7	36
GEORGIA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	65	43
GEORGIA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	8	6
GEORGIA POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	37	18
MISSISSIPPI POWER CO
Derivatives, Fair Value [Line Items]
Derivative asset, Gross amounts offset	(19)	(17)
Derivative asset, net amounts recognized in the balance sheets	8	42
Derivative liability, Gross amounts offset	(19)	(17)
Derivative liability, net amounts recognized in the balance sheets	36	15
MISSISSIPPI POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	27	59
Derivative liability, gross amount recognized	55	32
MISSISSIPPI POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	11	33
MISSISSIPPI POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	28	24
MISSISSIPPI POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	16	26
MISSISSIPPI POWER CO \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	27	8
SOUTHERN POWER CO
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	4	8
Derivative asset, Gross amounts offset	(1)	0
Derivative asset, net amounts recognized in the balance sheets	3	8
Derivative liability, gross amount recognized	38	59
Derivative liability, Gross amounts offset	(1)	0
Derivative liability, net amounts recognized in the balance sheets	37	59
Collateral already posted, assets, aggregate fair value	15
SOUTHERN POWER CO \| Interest rate derivatives
Derivatives, Fair Value [Line Items]
Derivative liability, net amounts recognized in the balance sheets	13
SOUTHERN POWER CO \| Energy-related derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	1	3
Derivative liability, gross amount recognized	0	0
SOUTHERN POWER CO \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	2
SOUTHERN POWER CO \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	0	0
SOUTHERN POWER CO \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	1	1
SOUTHERN POWER CO \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	0	0
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	3	5
Derivative liability, gross amount recognized	38	59
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	0
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	9	12
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	3	5
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	1	0
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	0
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	11	11
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	0
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	17	36
SOUTHERN Co GAS
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	17	28
Derivative asset, Gross amounts offset	14	0
Derivative asset, net amounts recognized in the balance sheets	31	28
Derivative liability, gross amount recognized	148	151
Derivative liability, Gross amounts offset	(38)	(41)
Derivative liability, net amounts recognized in the balance sheets	110	110
Collateral already posted, assets, aggregate fair value	52	41
SOUTHERN Co GAS \| Energy-related derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	4	12
Derivative liability, gross amount recognized	6	13
SOUTHERN Co GAS \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	4	11
SOUTHERN Co GAS \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	6	12
SOUTHERN Co GAS \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	1
SOUTHERN Co GAS \| Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	0	1
SOUTHERN Co GAS \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	8	12
SOUTHERN Co GAS \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	27	33
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	5	4
Derivative liability, gross amount recognized	115	105
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	1	3
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	23	15
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	1
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	4	4
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Interest rate derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	4	0
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Interest rate derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	19	14
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Interest rate derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	0	0
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Energy-related derivatives designated as hedging instruments for regulatory purposes \| Interest rate derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	$ 69	$ 72

Derivatives - Schedule of Pre-t

Derivatives - Schedule of Pre-tax Effects of Unrealized Derivative Gains (Losses) (Details) - Energy-related derivatives - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	$ (177)	$ 9
Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(141)	(71)
Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(71)	(23)
Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	29	72
Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	6	31
ALABAMA POWER CO
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(52)	23
ALABAMA POWER CO \| Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(37)	(8)
ALABAMA POWER CO \| Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(27)	(7)
ALABAMA POWER CO \| Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	11	29
ALABAMA POWER CO \| Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	1	9
GEORGIA POWER CO
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(87)	(19)
GEORGIA POWER CO \| Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(60)	(26)
GEORGIA POWER CO \| Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(30)	(14)
GEORGIA POWER CO \| Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	2	19
GEORGIA POWER CO \| Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	1	2
MISSISSIPPI POWER CO
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(28)	27
MISSISSIPPI POWER CO \| Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(22)	(13)
MISSISSIPPI POWER CO \| Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(14)	(2)
MISSISSIPPI POWER CO \| Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	4	22
MISSISSIPPI POWER CO \| Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	4	20
SOUTHERN Co GAS
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(10)	(22)
SOUTHERN Co GAS \| Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(22)	(24)
SOUTHERN Co GAS \| Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	0	0
SOUTHERN Co GAS \| Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	12	2
SOUTHERN Co GAS \| Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	$ 0	$ 0

Derivatives - Schedule of Pre_2

Derivatives - Schedule of Pre-Tax Effects of Hedging on AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	$ 36	$ (61)	$ (50)	$ (34)
Cash Flow Hedging \| Energy-related derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	(5)	(1)	(50)	41
Cash Flow Hedging \| Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	3	21	(10)	30
Cash Flow Hedging \| Foreign currency derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	8	(74)	9	(102)
Fair Value Hedging \| Foreign currency derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	30	(7)	1	(3)
GEORGIA POWER CO \| Cash Flow Hedging \| Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	(1)	19	(3)	31
SOUTHERN POWER CO
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	6	(72)	(4)	(95)
SOUTHERN POWER CO \| Cash Flow Hedging \| Energy-related derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	(2)	2	(13)	7
SOUTHERN POWER CO \| Cash Flow Hedging \| Foreign currency derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	8	(74)	9	(102)
SOUTHERN Co GAS
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	0	(7)	(33)	30
SOUTHERN Co GAS \| Cash Flow Hedging \| Energy-related derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	(3)	(2)	(37)	35
SOUTHERN Co GAS \| Cash Flow Hedging \| Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivatives	$ 3	$ (5)	$ 4	$ (5)

Derivatives - Schedule of Pre_3

Derivatives - Schedule of Pre-Tax Effects of Cash Flow and Fair Value Hedging on Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative [Line Items]
Depreciation and amortization	$ 1,112	$ 913	$ 2,222	$ 1,805
Total interest expense, net of amounts capitalized	(610)	(488)	(1,192)	(950)
Total other income (expense), net	142	139	286	283
Natural gas
Derivative [Line Items]
Total cost of sales	199	452	1,097	1,546
Other Income (Expense)
Derivative [Line Items]
Amount excluded from effectiveness testing recognized in earnings	(29)	7	(1)	3
Cash Flow Hedging \| Energy-related derivatives \| Cost of Sales
Derivative [Line Items]
Gain (loss) on hedges	(9)	10	(29)	18
Cash Flow Hedging \| Energy-related derivatives \| Depreciation and Amortization
Derivative [Line Items]
Gain (loss) on hedges	(4)	4	(13)	6
Cash Flow Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(5)	(6)	(9)	(13)
Cash Flow Hedging \| Foreign currency derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(2)	(7)	(5)	(13)
Cash Flow Hedging \| Foreign currency derivatives \| Other Income (Expense)
Derivative [Line Items]
Gain (loss) on hedges	0	(73)	10	(97)
Fair Value Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(45)	(76)	(3)	(198)
Fair Value Hedging \| Foreign currency derivatives \| Other Income (Expense)
Derivative [Line Items]
Gain (loss) on hedges	29	(96)	26	(121)
SOUTHERN POWER CO
Derivative [Line Items]
Depreciation and amortization	122	131	250	251
Total interest expense, net of amounts capitalized	(33)	(36)	(66)	(73)
Total other income (expense), net	2	1	4	3
SOUTHERN POWER CO \| Cash Flow Hedging \| Energy-related derivatives \| Depreciation and Amortization
Derivative [Line Items]
Gain (loss) on hedges	(4)	4	(13)	6
SOUTHERN POWER CO \| Cash Flow Hedging \| Foreign currency derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(2)	(7)	(5)	(13)
SOUTHERN POWER CO \| Cash Flow Hedging \| Foreign currency derivatives \| Other Income (Expense)
Derivative [Line Items]
Gain (loss) on hedges	0	(73)	10	(97)
SOUTHERN Co GAS
Derivative [Line Items]
Depreciation and amortization	143	138	284	275
Total interest expense, net of amounts capitalized	(73)	(61)	(150)	(122)
Total other income (expense), net	17	16	32	32
SOUTHERN Co GAS \| Natural gas
Derivative [Line Items]
Total cost of sales	199	452	1,097	1,546
SOUTHERN Co GAS \| Cash Flow Hedging \| Energy-related derivatives \| Cost of Sales
Derivative [Line Items]
Gain (loss) on hedges	(9)	10	(29)	18
SOUTHERN Co GAS \| Cash Flow Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	0	(1)	(1)	(1)
SOUTHERN Co GAS \| Fair Value Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(15)	(22)	(2)	(57)
Traditional Electric Operating Companies \| Cash Flow Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	0	0	0	0
Traditional Electric Operating Companies \| Fair Value Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	$ 0	$ 0	$ 0	$ 0

Derivatives - Schedule of Cumul

Derivatives - Schedule of Cumulative Basis Adjustments for Fair Value Hedges (Details) - Fair Value Hedging - Long-term debt - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Carrying Amount of the Hedged Item	$ (2,970)	$ (2,927)
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item	265	282
SOUTHERN Co GAS
Derivative [Line Items]
Carrying Amount of the Hedged Item	(417)	(415)
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item	$ 80	$ 81

Derivatives - Schedule of Pre_4

Derivatives - Schedule of Pre-tax Effect of Interest Rate and Energy Related Derivatives on Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Weather Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ 0	$ 0	$ 14	$ 0
Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	16	(40)	29	(18)
Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Natural gas revenues
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	0	(15)	0	(13)
Energy-related derivatives not designated as hedging instruments \| Energy-related derivatives \| Cost of natural gas
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ 16	$ (25)	$ 29	$ (5)

Segment and Related Informati_3

Segment and Related Information - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) state	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) state segment	Jun. 30, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of states in which entity operates \| state	3		3
Operating revenues	$ 5,532	$ 6,226	$ 11,777	$ 12,486
SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Operating revenues	$ 365	731	$ 769	1,146
SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Number of states in which entity operates \| state	4		4
Operating revenues	$ 834	1,063	$ 2,664	3,105
Number of reportable segments \| segment			3
SOUTHERN Co GAS \| Southern Natural Gas Company, LLC
Segment Reporting Information [Line Items]
Ownership percentage, equity method investment	50%		50%
SOUTHERN Co GAS \| Dalton Pipeline
Segment Reporting Information [Line Items]
Ownership percentage, equity method investment	50%		50%
Traditional Electric Operating Companies \| Wholesale revenues, affiliates \| SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Operating revenues	$ 116	232	$ 251	337
Traditional Electric Operating Companies \| Natural Gas \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	$ 0	$ 0	$ 0	$ 0

Segment and Related Informati_4

Segment and Related Information - Schedule of Financial Data for Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Net income	838	1,107	1,700	2,139
Goodwill	5,161		5,161		$ 5,161
Total assets	137,116		137,116		134,891
SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Operating revenues	525	899	1,033	1,438
Total assets					13,081
SOUTHERN POWER CO \| Disposal Group, Disposed of by Sale \| Spare Parts
Segment Reporting Information [Line Items]
Gain on sale			16
Gain on sale, after tax			12
SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	852	1,083	2,728	3,140
Net income	85	115	393	433
Goodwill	5,015		5,015		5,015
Total assets	24,331		24,331		24,621
GEORGIA POWER CO
Segment Reporting Information [Line Items]
Operating revenues	2,391	3,121	4,567	5,328
Total assets	55,001		55,001		53,163
GEORGIA POWER CO \| Disposal Group, Disposed of by Sale \| Spare Parts
Segment Reporting Information [Line Items]
Gain on sale			52
Gain on sale, after tax			39
Electric Utilities
Segment Reporting Information [Line Items]
Operating revenues	4,764	6,006	9,247	10,516
SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	852	1,083	2,728	3,140
Gas distribution operations \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Goodwill	4,034		4,034		4,034
Gas marketing services \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Goodwill	981		981		981
Operating Segments \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	847	1,080	2,719	3,133
Net income	86	116	387	425
Total assets	25,460		25,460		25,233
Operating Segments \| Electric Utilities
Segment Reporting Information [Line Items]
Operating revenues	4,764	6,006	9,247	10,516
Net income	908	1,134	1,620	1,981
Goodwill	2		2		2
Total assets	110,208		110,208		108,283
Operating Segments \| Traditional Electric Operating Companies
Segment Reporting Information [Line Items]
Operating revenues	4,359	5,563	8,472	9,778
Net income	823	1,036	1,433	1,811
Goodwill	0		0		0
Total assets	97,751		97,751		95,861
Operating Segments \| SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Operating revenues	525	899	1,033	1,438
Net income	85	98	187	170
Goodwill	2		2		2
Total assets	13,046		13,046		13,081
Operating Segments \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	852	1,083	2,728	3,140
Net income	85	115	393	433
Goodwill	5,015		5,015		5,015
Total assets	24,331		24,331		24,621
Operating Segments \| Gas distribution operations \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	764	980	2,383	2,782
Net income	60	92	281	306
Total assets	22,366		22,366		22,040
Operating Segments \| Gas Pipeline Investments \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	8	8	16	16
Net income	19	23	50	52
Total assets	1,552		1,552		1,577
Operating Segments \| Gas marketing services \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	75	92	320	335
Net income	7	1	56	67
Total assets	1,542		1,542		1,616
Operating Segments \| All Other
Segment Reporting Information [Line Items]
Operating revenues	180	159	346	283
Net income	(157)	(137)	(311)	(263)
Goodwill	144		144		144
Total assets	3,523		3,523		2,665
Operating Segments \| All Other \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	9	10	22	26
Net income	(1)	(1)	6	8
Total assets	9,606		9,606		8,943
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(48)	(42)	(93)	(85)
Net income	2	(5)	(2)	(12)
Goodwill	0		0		0
Total assets	(946)		(946)		(678)
Eliminations \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	(4)	(7)	(13)	(19)
Net income	0	0	0	0
Total assets	(10,735)		(10,735)		(9,555)
Eliminations \| Electric Utilities
Segment Reporting Information [Line Items]
Operating revenues	(120)	(456)	(258)	(700)
Net income	0	$ 0	0	$ 0
Goodwill	0		0		0
Total assets	$ (589)		$ (589)		$ (659)

Segment and Related Informati_5

Segment and Related Information - Schedule of Financial Data for Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Concentration Risk [Line Items]
Operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Electric Utilities
Concentration Risk [Line Items]
Operating revenues	4,764	6,006	9,247	10,516
Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	852	1,083	2,728	3,140
Retail electric revenues
Concentration Risk [Line Items]
Operating revenues	3,859	4,789	7,458	8,402
Retail electric revenues \| Electric Utilities
Concentration Risk [Line Items]
Operating revenues	3,859	4,789	7,458	8,402
Wholesale electric revenues
Concentration Risk [Line Items]
Operating revenues	605	937	1,203	1,601
Wholesale electric revenues \| Electric Utilities
Concentration Risk [Line Items]
Operating revenues	605	937	1,203	1,601
Other Revenue \| Electric Utilities
Concentration Risk [Line Items]
Operating revenues	300	280	586	513
Other electric revenues
Concentration Risk [Line Items]
Operating revenues	209	192	399	370
Natural Gas
Concentration Risk [Line Items]
Operating revenues	852	1,083	2,728	3,140
Gas Distribution Operations \| Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	761	975	2,372	2,765
Gas marketing services \| Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	75	92	320	335
Other \| Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	16	16	36	40
Other revenues
Concentration Risk [Line Items]
Operating revenues	$ 223	$ 205	$ 440	$ 341

Segment and Related Informati_6

Segment and Related Information - Schedule of Business Segment Financial Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total operating revenues	$ 5,748	$ 7,206	$ 12,228	$ 13,854
Net income after dividends on preferred stock	838	1,107	1,700	2,139
Total assets	137,116		137,116		$ 134,891
SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Total operating revenues	852	1,083	2,728	3,140
Net income after dividends on preferred stock	85	115	393	433
Total assets	24,331		24,331		24,621
Operating Segments \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Total operating revenues	847	1,080	2,719	3,133
Net income after dividends on preferred stock	86	116	387	425
Total assets	25,460		25,460		25,233
Operating Segments \| Gas distribution operations \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Total operating revenues	764	980	2,383	2,782
Net income after dividends on preferred stock	60	92	281	306
Total assets	22,366		22,366		22,040
Operating Segments \| Gas Pipeline Investments \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Total operating revenues	8	8	16	16
Net income after dividends on preferred stock	19	23	50	52
Total assets	1,552		1,552		1,577
Operating Segments \| Gas marketing services \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Total operating revenues	75	92	320	335
Net income after dividends on preferred stock	7	1	56	67
Total assets	1,542		1,542		1,616
Operating Segments \| All Other
Segment Reporting Information [Line Items]
Total operating revenues	180	159	346	283
Net income after dividends on preferred stock	(157)	(137)	(311)	(263)
Total assets	3,523		3,523		2,665
Operating Segments \| All Other \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Total operating revenues	9	10	22	26
Net income after dividends on preferred stock	(1)	(1)	6	8
Total assets	9,606		9,606		8,943
Eliminations
Segment Reporting Information [Line Items]
Total operating revenues	(48)	(42)	(93)	(85)
Net income after dividends on preferred stock	2	(5)	(2)	(12)
Total assets	(946)		(946)		(678)
Eliminations \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Total operating revenues	(4)	(7)	(13)	(19)
Net income after dividends on preferred stock	0	$ 0	0	$ 0
Total assets	$ (10,735)		$ (10,735)		$ (9,555)