The Southern Company (SO) 10-Q27 Jul 222022 Q2 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page	6 Months Ended
Cover Page	Jun. 30, 2022 shares
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
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)	1,063,001,320
Entity Central Index Key	0000092122
Amendment Flag	false
Document Fiscal Year Focus	2022
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
2019 Series A Corporate Units
Document Information [Line Items]
Title of 12(b) Security	2019 Series A Corporate Units
Trading Symbol	SOLN
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
ALABAMA POWER CO \| 5.00% Series Class A Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	5.00% Series Class A Preferred Stock
Trading Symbol	ALP PR Q
Security Exchange Name	NYSE
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 2016A 1.000% Senior Notes due 2022
Document Information [Line Items]
Title of 12(b) Security	Series 2016A 1.000% Senior Notes due 2022
Trading Symbol	SO/22B
Security Exchange Name	NYSE
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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Total operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Operating Expenses:
Other operations and maintenance	1,558	1,438	3,075	2,810
Depreciation and amortization	913	891	1,805	1,762
Taxes other than income taxes	349	313	721	657
Estimated loss on Plant Vogtle Units 3 and 4	52	460	52	508
Gain on dispositions, net	(10)	(11)	(33)	(54)
Total operating expenses	5,551	4,490	10,815	8,802
Operating Income	1,655	708	3,039	2,306
Other Income and (Expense):
Allowance for equity funds used during construction	53	45	104	90
Earnings (loss) from equity method investments	34	(40)	80	5
Interest expense, net of amounts capitalized	(488)	(450)	(950)	(901)
Other income (expense), net	139	101	283	160
Total other income and (expense)	(262)	(344)	(483)	(646)
Earnings (Loss) Before Income Taxes	1,393	364	2,556	1,660
Income taxes (benefit)	304	(12)	477	178
Consolidated Net Income	1,089	376	2,079	1,482
Dividends on preferred stock of subsidiaries	4	4	7	7
Net loss attributable to noncontrolling interests	(22)	0	(67)	(33)
Net Income	$ 1,107	$ 372	$ 2,139	$ 1,508
Earnings per share -
Basic (in dollars per share)	$ 1.04	$ 0.35	$ 2.01	$ 1.42
Diluted (in dollars per share)	$ 1.03	$ 0.35	$ 2	$ 1.41
Average number of shares of common stock outstanding — (in millions)
Basic (in shares)	1,065	1,061	1,064	1,060
Diluted (in shares)	1,072	1,067	1,070	1,066
Retail electric revenues
Operating Revenues:
Total operating revenues	$ 4,789	$ 3,599	$ 8,402	$ 6,941
Wholesale Electric
Operating Revenues:
Total operating revenues	937	546	1,601	1,091
Other electric revenues
Operating Revenues:
Total operating revenues	192	175	370	346
Natural Gas
Operating Revenues:
Total operating revenues	1,083	677	3,140	2,371
Natural gas
Operating Expenses:
Less Gross Gas Costs	452	231	1,546	814
Alternative revenue programs
Operating Revenues:
Total operating revenues	2	2	1	4
Other revenues
Operating Revenues:
Total operating revenues	205	201	341	359
Operating Expenses:
Less Gross Gas Costs	114	103	183	185
Fuel
Operating Expenses:
Less Gross Gas Costs	1,715	848	2,826	1,696
Purchased power
Operating Expenses:
Less Gross Gas Costs	$ 408	$ 217	$ 640	$ 424

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Income (Unaudited) - Southern (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Total operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Natural Gas
Total operating revenues	1,083	677	3,140	2,371
Alternative revenue programs
Total operating revenues	$ 2	$ 2	$ 1	$ 4

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,089	$ 376	$ 2,079	$ 1,482
Qualifying hedges:
Changes in fair value, net of tax	(45)	14	(26)	(16)
Reclassification adjustment for amounts included in net income, net of tax	54	(5)	74	50
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	2	3	5	6
Total other comprehensive income	11	12	53	40
Comprehensive Income	1,100	388	2,132	1,522
Dividends on preferred stock of subsidiaries	4	4	7	7
Comprehensive loss attributable to noncontrolling interests	(22)	0	(67)	(33)
Comprehensive Income	$ 1,118	$ 384	$ 2,192	$ 1,548

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - Southern (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Changes in fair value, tax	$ (15)	$ 5	$ (7)	$ (5)
Qualifying hedges, reclassification adjustment, tax	17	(1)	24	17
Reclassification adjustment for amounts included in net income, tax	$ 1	$ 2	$ 2	$ 3

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - Southern - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income (loss)	$ 2,079	$ 1,482
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,995	1,949
Deferred income taxes	240	(101)
Utilization of federal investment tax credits	281	224
Allowance for equity funds used during construction	(104)	(90)
Mark-to-market adjustments	14	136
Pension, postretirement, and other employee benefits	(211)	(115)
Settlement of asset retirement obligations	(198)	(228)
Stock based compensation expense	100	105
Estimated loss on Plant Vogtle Units 3 and 4	52	508
Storm damage accruals	107	112
Natural gas cost under recovery – long-term	192	(119)
Retail fuel cost under recovery – long-term	(729)	0
Other, net	21	117
Changes in certain current assets and liabilities —
Receivables	(637)	29
Prepayments	(90)	(79)
Materials and supplies	(109)	(57)
Natural gas for sale, net of temporary LIFO liquidation	335	375
Natural gas cost under recovery	(94)	(485)
Other current assets	12	94
Accounts payable	703	(177)
Accrued taxes	(150)	(157)
Accrued compensation	(260)	(238)
Retail fuel cost over recovery	0	(146)
Other current liabilities	30	(235)
Net cash provided from operating activities	3,579	2,904
Investing Activities:
Business acquisitions, net of cash acquired	0	(345)
Property additions	(3,213)	(3,384)
Nuclear decommissioning trust fund purchases	(628)	(930)
Nuclear decommissioning trust fund sales	624	926
Proceeds from dispositions	119	25
Cost of removal, net of salvage	(377)	(184)
Payments pursuant to LTSAs	(81)	(114)
Other investing activities	96	(20)
Net cash used for investing activities	(3,460)	(4,026)
Financing Activities:
Increase (decrease) in notes payable, net	263	492
Proceeds —
Long-term debt	2,200	4,646
Short-term borrowings	1,200	325
Common stock	61	24
Redemptions and repurchases —
Long-term debt	(1,851)	(2,477)
Short-term borrowings	(400)	(25)
Capital contributions from noncontrolling interests	73	343
Distributions to noncontrolling interests	(115)	(113)
Payment of common stock dividends	(1,425)	(1,377)
Other financing activities	(219)	(167)
Net cash provided from (used for) financing activities	(213)	1,671
Net Change in Cash, Cash Equivalents, and Restricted Cash	(94)	549
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,735	1,617
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	836	884
Income taxes, net	157	88
Noncash transactions —
Accrued property additions at year-end	837	943
Contributions from noncontrolling interests	0	89
Contributions of wind turbine equipment	0	82
Right-of-use assets obtained under leases	15	90
Reassessment of right-of-use assets under operating leases	$ 40	$ 0

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows (Unaudited) - Southern (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Statement of Cash Flows [Abstract]
Net cash paid for capitalized interest	$ 46	$ 43

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - Southern - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 1,724	$ 1,798
Receivables —
Customer accounts	2,277	1,806
Unbilled revenues	807	711
Other accounts and notes	534	523
Accumulated provision for uncollectible accounts	(94)	(78)
Materials and supplies	1,641	1,543
Fossil fuel for generation	431	450
Natural gas for sale	209	362
Prepaid expenses	528	330
Assets from risk management activities, net of collateral	247	151
Regulatory assets – asset retirement obligations	263	219
Natural gas cost under recovery	361	266
Other regulatory assets	641	653
Other current assets	212	231
Total current assets	9,781	8,965
Property, Plant, and Equipment:
In service	117,418	115,592
Less: Accumulated depreciation	35,203	34,079
Plant in service, net of depreciation	82,215	81,513
Nuclear fuel, at amortized cost	837	824
Construction work in progress	9,770	8,771
Total property, plant, and equipment	92,822	91,108
Other Property and Investments:
Goodwill	5,280	5,280
Nuclear decommissioning trusts, at fair value	2,150	2,542
Equity investments in unconsolidated subsidiaries	1,305	1,282
Other intangible assets, net of amortization	425	445
Miscellaneous property and investments	576	653
Total other property and investments	9,736	10,202
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,623	1,701
Deferred charges related to income taxes	843	824
Prepaid pension costs	1,893	1,657
Unamortized loss on reacquired debt	248	258
Regulatory assets – asset retirement obligations, deferred	5,982	5,466
Other regulatory assets, deferred	5,448	5,577
Other deferred charges and assets	2,393	1,776
Total deferred charges and other assets	18,430	17,259
Total Assets	130,769	127,534
Current Liabilities:
Securities due within one year	1,052	2,157
Notes payable	2,510	1,440
Accounts payable	2,908	2,169
Customer deposits	461	479
Accrued taxes —
Accrued income taxes	17	50
Other accrued taxes	635	641
Accrued interest	553	533
Accrued compensation	807	1,070
Asset retirement obligations	693	697
Operating lease obligations	232	250
Other regulatory liabilities	557	563
Other current liabilities	1,062	872
Total current liabilities	11,487	10,921
Long-term Debt	51,204	50,120
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	9,620	8,862
Deferred credits related to income taxes	5,318	5,401
Accumulated deferred ITCs	2,175	2,216
Employee benefit obligations	1,509	1,550
Operating lease obligations, deferred	1,464	1,503
Asset retirement obligations, deferred	11,010	10,990
Other cost of removal obligations	1,993	2,103
Other regulatory liabilities, deferred	536	485
Other deferred credits and liabilities	1,198	816
Total deferred credits and other liabilities	34,823	33,926
Total Liabilities	97,514	94,967
Redeemable preferred stock	242	291
Common Stockholder's Equity (See accompanying statements)	33,013	32,276
Total Liabilities and Stockholders' Equity	$ 130,769	$ 127,534

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) - Southern (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Other intangible assets, amortization	$ 326	$ 307

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 Deficit)	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2020		1,058
Beginning balance (in shares) at Dec. 31, 2020			(1)
Beginning balance at Dec. 31, 2020	$ 32,234	$ 5,268	$ (46)	$ 11,834	$ 11,311	$ (395)	$ 4,262
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	1,103				1,135		(32)
Other comprehensive income (loss)	28					28
Stock issued (in shares)		2
Stock issued	14	$ 5		9
Stock-based compensation	9			9
Cash dividends on common stock	(678)				(678)
Capital contributions from noncontrolling interests	403						403
Distributions to noncontrolling interests	(46)						(46)
Other	1			2			(1)
Ending balance (in shares) at Mar. 31, 2021		1,060
Ending balance (in shares) at Mar. 31, 2021			(1)
Ending balance at Mar. 31, 2021	33,068	$ 5,273	$ (46)	11,854	11,768	(367)	4,586
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Consolidated net income (loss)	372				372		0
Other comprehensive income (loss)	12					12
Stock issued	10	$ 1		9
Stock-based compensation	22			22
Cash dividends on common stock	(699)				(699)
Capital contributions from noncontrolling interests	29						29
Distributions to noncontrolling interests	(68)						(68)
Other	0		$ (2)	1	1
Ending balance (in shares) at Jun. 30, 2021		1,060
Ending balance (in shares) at Jun. 30, 2021			(1)
Ending balance at Jun. 30, 2021	32,746	$ 5,274	$ (48)	11,886	11,442	(355)	4,547
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 (loss)	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 (loss)	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

Condensed Consolidated Statem_8

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - Southern (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 0.68	$ 0.66	$ 0.66	$ 0.64

Condensed Statements of Income

Condensed Statements of Income (Unaudited) - APC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Total operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Operating Expenses:
Other operations and maintenance	1,558	1,438	3,075	2,810
Depreciation and amortization	913	891	1,805	1,762
Taxes other than income taxes	349	313	721	657
Total operating expenses	5,551	4,490	10,815	8,802
Operating Income	1,655	708	3,039	2,306
Other Income and (Expense):
Allowance for equity funds used during construction	53	45	104	90
Interest expense, net of amounts capitalized	(488)	(450)	(950)	(901)
Total other income (expense), net	139	101	283	160
Total other income and (expense)	(262)	(344)	(483)	(646)
Earnings (Loss) Before Income Taxes	1,393	364	2,556	1,660
Income taxes (benefit)	304	(12)	477	178
Net income	1,089	376	2,079	1,482
Dividends on preferred stock of subsidiaries	4	4	7	7
Net Income	1,107	372	2,139	1,508
Retail electric revenues
Operating Revenues:
Total operating revenues	4,789	3,599	8,402	6,941
Wholesale Electric
Operating Revenues:
Total operating revenues	937	546	1,601	1,091
Other electric revenues
Operating Revenues:
Total operating revenues	192	175	370	346
Natural Gas
Operating Revenues:
Total operating revenues	1,083	677	3,140	2,371
Other revenues
Operating Revenues:
Total operating revenues	205	201	341	359
Operating Expenses:
Total cost of sales	114	103	183	185
Fuel
Operating Expenses:
Total cost of sales	1,715	848	2,826	1,696
Purchased power
Operating Expenses:
Total cost of sales	408	217	640	424
Alabama Power
Operating Revenues:
Total operating revenues	1,931	1,556	3,580	3,115
Operating Expenses:
Other operations and maintenance	441	413	852	775
Depreciation and amortization	218	214	432	425
Taxes other than income taxes	100	101	204	203
Total operating expenses	1,376	1,078	2,530	2,123
Operating Income	555	478	1,050	992
Other Income and (Expense):
Allowance for equity funds used during construction	17	12	33	24
Interest expense, net of amounts capitalized	(91)	(84)	(180)	(168)
Total other income (expense), net	27	33	61	62
Total other income and (expense)	(47)	(39)	(86)	(82)
Earnings (Loss) Before Income Taxes	508	439	964	910
Income taxes (benefit)	121	104	227	213
Net income	387	335	737	697
Dividends on preferred stock of subsidiaries	4	4	7	7
Net Income	383	331	730	690
Alabama Power \| Retail electric revenues
Operating Revenues:
Total operating revenues	1,629	1,354	3,008	2,706
Alabama Power \| Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	159	85	272	178
Alabama Power \| Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	34	24	100	55
Alabama Power \| Other revenues
Operating Revenues:
Total operating revenues	109	93	200	176
Alabama Power \| Fuel
Operating Expenses:
Total cost of sales	401	263	733	554
Alabama Power \| Purchased power
Operating Expenses:
Total cost of sales	95	48	162	97
Alabama Power \| Purchased power, affiliates
Operating Expenses:
Total cost of sales	$ 121	$ 39	$ 147	$ 69

Condensed Statements of Compreh

Condensed Statements of Comprehensive Income (Unaudited) - APC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 1,089	$ 376	$ 2,079	$ 1,482
Qualifying hedges:
Changes in fair value, net of tax	(45)	14	(26)	(16)
Reclassification adjustment for amounts included in net income, net of tax	54	(5)	74	50
Total other comprehensive income	11	12	53	40
Comprehensive Income	1,100	388	2,132	1,522
Alabama Power
Net income	387	335	737	697
Qualifying hedges:
Changes in fair value, net of tax	0	0	(1)	0
Reclassification adjustment for amounts included in net income, net of tax	1	1	2	2
Total other comprehensive income	1	1	1	2
Comprehensive Income	$ 388	$ 336	$ 738	$ 699

Condensed Statements of Compr_2

Condensed Statements of Comprehensive Income (Unaudited) - APC (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Changes in fair value, tax	$ (15)	$ 5	$ (7)	$ (5)
Qualifying hedges, reclassification adjustment, tax	17	(1)	24	17
Alabama Power
Changes in fair value, tax	0	0	(1)	0
Qualifying hedges, reclassification adjustment, tax	$ 0	$ 0	$ 1	$ 1

Condensed Statements of Cash Fl

Condensed Statements of Cash Flows (Unaudited) - APC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income (loss)	$ 2,079	$ 1,482
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,995	1,949
Deferred income taxes	240	(101)
Pension, postretirement, and other employee benefits	(211)	(115)
Settlement of asset retirement obligations	(198)	(228)
Other, net	21	117
Changes in certain current assets and liabilities —
Receivables	(637)	29
Prepayments	(90)	(79)
Other current assets	12	94
Accounts payable	703	(177)
Accrued compensation	(260)	(238)
Other current liabilities	30	(235)
Net cash provided from operating activities	3,579	2,904
Investing Activities:
Property additions	(3,213)	(3,384)
Nuclear decommissioning trust fund purchases	(628)	(930)
Nuclear decommissioning trust fund sales	624	926
Cost of removal, net of salvage	(377)	(184)
Other investing activities	96	(20)
Net cash used for investing activities	(3,460)	(4,026)
Redemptions and repurchases —
Payment of common stock dividends	(1,425)	(1,377)
Other financing activities	(219)	(167)
Net cash provided from (used for) financing activities	(213)	1,671
Net Change in Cash, Cash Equivalents, and Restricted Cash	(94)	549
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,735	1,617
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	836	884
Income taxes, net	157	88
Noncash transactions —
Accrued property additions at year-end	837	943
Right-of-use assets obtained under leases	15	90
Alabama Power
Operating Activities:
Net income (loss)	737	697
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	494	496
Deferred income taxes	117	87
Pension, postretirement, and other employee benefits	(59)	(39)
Settlement of asset retirement obligations	(91)	(104)
Retail fuel cost under recovery – long-term	(191)	0
Other, net	(67)	(35)
Changes in certain current assets and liabilities —
Receivables	(296)	(85)
Prepayments	(69)	(53)
Other current assets	(33)	(23)
Accounts payable	14	(236)
Accrued compensation	(55)	(60)
Other current liabilities	9	(61)
Net cash provided from operating activities	510	584
Investing Activities:
Property additions	(759)	(844)
Nuclear decommissioning trust fund purchases	(180)	(473)
Nuclear decommissioning trust fund sales	180	473
Cost of removal, net of salvage	(104)	(56)
Change in construction payables, net	(8)	25
Other investing activities	(18)	(18)
Net cash used for investing activities	(889)	(893)
Proceeds —
Senior notes	700	600
Redemptions and repurchases —
Senior notes	(550)	(200)
Capital contributions from parent company	656	624
Payment of common stock dividends	(508)	(492)
Other financing activities	(71)	(26)
Net cash provided from (used for) financing activities	227	506
Net Change in Cash, Cash Equivalents, and Restricted Cash	(152)	197
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,060	530
Cash, Cash Equivalents, and Restricted Cash at End of Period	908	727
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	166	154
Income taxes, net	192	171
Noncash transactions —
Accrued property additions at year-end	141	191
Right-of-use assets obtained under leases	$ 6	$ 2

Condensed Statements of Cash _2

Condensed Statements of Cash Flows (Unaudited) - APC (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net cash paid for capitalized interest	$ 46	$ 43
Alabama Power
Net cash paid for capitalized interest	$ 9	$ 7

Condensed Balance Sheets (Unaud

Condensed Balance Sheets (Unaudited) - APC - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 1,724	$ 1,798
Receivables —
Customer accounts	2,277	1,806
Unbilled revenues	807	711
Other accounts and notes	534	523
Accumulated provision for uncollectible accounts	(94)	(78)
Fossil fuel for generation	431	450
Materials and supplies	1,641	1,543
Prepaid expenses	528	330
Other regulatory assets	641	653
Other current assets	212	231
Total current assets	9,781	8,965
Property, Plant, and Equipment:
In service	117,418	115,592
Less: Accumulated depreciation	35,203	34,079
Plant in service, net of depreciation	82,215	81,513
Nuclear fuel, at amortized cost	837	824
Construction work in progress	9,770	8,771
Total property, plant, and equipment	92,822	91,108
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	2,150	2,542
Equity investments in unconsolidated subsidiaries	1,305	1,282
Miscellaneous property and investments	576	653
Total other property and investments	9,736	10,202
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,623	1,701
Deferred charges related to income taxes	843	824
Regulatory assets – asset retirement obligations, deferred	5,982	5,466
Other regulatory assets, deferred	5,448	5,577
Other deferred charges and assets	2,393	1,776
Total deferred charges and other assets	18,430	17,259
Total Assets	130,769	127,534
Current Liabilities:
Securities due within one year	1,052	2,157
Accounts payable —
Customer deposits	461	479
Accrued interest	553	533
Accrued compensation	807	1,070
Asset retirement obligations	693	697
Other regulatory liabilities	557	563
Other current liabilities	1,062	872
Total current liabilities	11,487	10,921
Long-term Debt	51,204	50,120
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	9,620	8,862
Deferred credits related to income taxes	5,318	5,401
Accumulated deferred ITCs	2,175	2,216
Employee benefit obligations	1,509	1,550
Operating lease obligations, deferred	1,464	1,503
Asset retirement obligations, deferred	11,010	10,990
Other cost of removal obligations	1,993	2,103
Other regulatory liabilities, deferred	536	485
Other deferred credits and liabilities	1,198	816
Total deferred credits and other liabilities	34,823	33,926
Total Liabilities	97,514	94,967
Redeemable preferred stock	242	291
Common Stockholder's Equity (See accompanying statements)	33,013	32,276
Total Liabilities and Stockholders' Equity	130,769	127,534
Alabama Power
Current Assets:
Cash and cash equivalents	908	1,060
Receivables —
Customer accounts	501	410
Unbilled revenues	189	138
Affiliated	85	37
Other accounts and notes	101	55
Accumulated provision for uncollectible accounts	(14)	(14)
Fossil fuel for generation	161	159
Materials and supplies	568	548
Prepaid expenses	147	41
Other regulatory assets	263	208
Other current assets	113	67
Total current assets	3,022	2,709
Property, Plant, and Equipment:
In service	33,596	33,135
Less: Accumulated depreciation	10,589	10,313
Plant in service, net of depreciation	23,007	22,822
Nuclear fuel, at amortized cost	251	247
Construction work in progress	1,319	1,147
Total property, plant, and equipment	24,577	24,216
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,124	1,325
Equity investments in unconsolidated subsidiaries	56	57
Miscellaneous property and investments	128	126
Total other property and investments	1,308	1,508
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	89	108
Deferred charges related to income taxes	246	240
Prepaid pension and other postretirement benefit costs	568	513
Regulatory assets – asset retirement obligations, deferred	1,845	1,547
Other regulatory assets, deferred	1,860	1,807
Other deferred charges and assets	395	334
Total deferred charges and other assets	5,003	4,549
Total Assets	33,910	32,982
Current Liabilities:
Securities due within one year	201	751
Accounts payable —
Affiliated	414	309
Other	351	459
Customer deposits	107	106
Accrued taxes	128	98
Accrued interest	109	100
Accrued compensation	174	219
Asset retirement obligations	325	320
Other regulatory liabilities	133	215
Other current liabilities	121	125
Total current liabilities	2,063	2,702
Long-term Debt	9,633	8,936
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,719	3,573
Deferred credits related to income taxes	1,944	1,968
Accumulated deferred ITCs	84	88
Employee benefit obligations	176	171
Operating lease obligations, deferred	66	66
Asset retirement obligations, deferred	3,998	4,014
Other cost of removal obligations	106	192
Other regulatory liabilities, deferred	227	210
Other deferred credits and liabilities	58	58
Total deferred credits and other liabilities	10,378	10,340
Total Liabilities	22,074	21,978
Redeemable preferred stock	242	291
Common Stockholder's Equity (See accompanying statements)	11,594	10,713
Total Liabilities and Stockholders' Equity	$ 33,910	$ 32,982

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, 2020							31
Beginning balance at Dec. 31, 2020	$ 32,234	$ 5,268	$ 11,834	$ 11,311	$ (395)	$ 9,810	$ 1,222	$ 5,413	$ 3,194	$ (19)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock						359			359
Capital contributions from parent company						602		602
Other comprehensive income (loss)	28				28	1				1
Cash dividends on common stock	(678)			(678)		(246)			(246)
Other	1		2
Ending balance (in shares) at Mar. 31, 2021							31
Ending balance at Mar. 31, 2021	33,068	5,273	11,854	11,768	(367)	10,526	$ 1,222	6,015	3,307	(18)
Beginning balance (in shares) at Dec. 31, 2020							31
Beginning balance at Dec. 31, 2020	32,234	5,268	11,834	11,311	(395)	9,810	$ 1,222	5,413	3,194	(19)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	1,508					690
Ending balance (in shares) at Jun. 30, 2021							31
Ending balance at Jun. 30, 2021	32,746	5,274	11,886	11,442	(355)	10,637	$ 1,222	6,041	3,391	(17)
Beginning balance (in shares) at Mar. 31, 2021							31
Beginning balance at Mar. 31, 2021	33,068	5,273	11,854	11,768	(367)	10,526	$ 1,222	6,015	3,307	(18)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after dividends on preferred stock	372					331			331
Capital contributions from parent company						26		26
Other comprehensive income (loss)	12				12	1				1
Cash dividends on common stock	(699)			(699)		(246)			(246)
Other	0		1	1		(1)			(1)
Ending balance (in shares) at Jun. 30, 2021							31
Ending balance at Jun. 30, 2021	32,746	5,274	11,886	11,442	(355)	10,637	$ 1,222	6,041	3,391	(17)
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 (loss)	42				42
Cash dividends on common stock	(702)			(702)		(254)			(254)
Other	7		7	2
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 (loss)	11				11	1				1
Cash dividends on common stock	(723)			(723)		(254)			(254)
Other	2		4
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)

Condensed Statements of Incom_2

Condensed Statements of Income (Unaudited) - GPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Total operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Operating Expenses:
Other operations and maintenance	1,558	1,438	3,075	2,810
Depreciation and amortization	913	891	1,805	1,762
Taxes other than income taxes	349	313	721	657
Estimated loss on Plant Vogtle Units 3 and 4	52	460	52	508
Total operating expenses	5,551	4,490	10,815	8,802
Operating Income	1,655	708	3,039	2,306
Other Income and (Expense):
Allowance for equity funds used during construction	53	45	104	90
Interest expense, net of amounts capitalized	(488)	(450)	(950)	(901)
Other income (expense), net	139	101	283	160
Total other income and (expense)	(262)	(344)	(483)	(646)
Earnings (Loss) Before Income Taxes	1,393	364	2,556	1,660
Income taxes (benefit)	304	(12)	477	178
Consolidated Net Income	1,089	376	2,079	1,482
Retail electric revenues
Operating Revenues:
Total operating revenues	4,789	3,599	8,402	6,941
Wholesale Electric
Operating Revenues:
Total operating revenues	937	546	1,601	1,091
Other electric revenues
Operating Revenues:
Total operating revenues	192	175	370	346
Natural Gas
Operating Revenues:
Total operating revenues	1,083	677	3,140	2,371
Other revenues
Operating Revenues:
Total operating revenues	205	201	341	359
Operating Expenses:
Less Gross Gas Costs	114	103	183	185
Fuel
Operating Expenses:
Less Gross Gas Costs	1,715	848	2,826	1,696
Purchased power
Operating Expenses:
Less Gross Gas Costs	408	217	640	424
GEORGIA POWER CO
Operating Revenues:
Total operating revenues	3,121	2,225	5,328	4,195
Operating Expenses:
Other operations and maintenance	573	542	1,091	1,015
Depreciation and amortization	356	342	706	680
Taxes other than income taxes	141	118	265	235
Estimated loss on Plant Vogtle Units 3 and 4	52	460	52	508
Total operating expenses	2,319	2,098	4,085	3,667
Operating Income	802	127	1,243	528
Other Income and (Expense):
Allowance for equity funds used during construction	33	30	65	61
Interest expense, net of amounts capitalized	(117)	(106)	(224)	(210)
Other income (expense), net	54	42	103	83
Total other income and (expense)	(30)	(34)	(56)	(66)
Earnings (Loss) Before Income Taxes	772	93	1,187	462
Income taxes (benefit)	164	(50)	194	(32)
Consolidated Net Income	608	143	993	494
GEORGIA POWER CO \| Retail electric revenues
Operating Revenues:
Total operating revenues	2,908	2,026	4,926	3,813
GEORGIA POWER CO \| Wholesale Electric
Operating Revenues:
Total operating revenues	64	36	130	80
GEORGIA POWER CO \| Other revenues
Operating Revenues:
Total operating revenues	149	163	272	302
GEORGIA POWER CO \| Fuel
Operating Expenses:
Less Gross Gas Costs	628	343	1,046	656
GEORGIA POWER CO \| Purchased power
Operating Expenses:
Less Gross Gas Costs	246	144	396	288
GEORGIA POWER CO \| Purchased power, affiliates
Operating Expenses:
Less Gross Gas Costs	$ 323	$ 149	$ 529	$ 285

Condensed Statements of Compr_3

Condensed Statements of Comprehensive Income (Unaudited) - GPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 1,089	$ 376	$ 2,079	$ 1,482
Qualifying hedges:
Changes in fair value, net of tax	(45)	14	(26)	(16)
Reclassification adjustment for amounts included in net income, net of tax	54	(5)	74	50
Total other comprehensive income	11	12	53	40
Comprehensive Income	1,100	388	2,132	1,522
GEORGIA POWER CO
Net income	608	143	993	494
Qualifying hedges:
Changes in fair value, net of tax	15	0	23	0
Reclassification adjustment for amounts included in net income, net of tax	1	1	3	3
Total other comprehensive income	16	1	26	3
Comprehensive Income	$ 624	$ 144	$ 1,019	$ 497

Condensed Statements of Compr_4

Condensed Statements of Comprehensive Income (Unaudited) - GPC (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Changes in fair value, tax	$ (15)	$ 5	$ (7)	$ (5)
Qualifying hedges, reclassification adjustment, tax	17	(1)	24	17
GEORGIA POWER CO
Changes in fair value, tax	4	0	8	0
Qualifying hedges, reclassification adjustment, tax	$ 0	$ 1	$ 1	$ 1

Condensed Statements of Cash _3

Condensed Statements of Cash Flows (Unaudited) - GPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income (loss)	$ 2,079	$ 1,482
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,995	1,949
Deferred income taxes	240	(101)
Allowance for equity funds used during construction	(104)	(90)
Pension, postretirement, and other employee benefits	(211)	(115)
Settlement of asset retirement obligations	(198)	(228)
Storm damage accruals	107	112
Retail fuel cost under recovery – long-term	(729)	0
Estimated loss on Plant Vogtle Units 3 and 4	52	508
Other, net	21	117
Changes in certain current assets and liabilities —
Receivables	(637)	29
Materials and supplies	(109)	(57)
Other current assets	12	94
Accounts payable	703	(177)
Accrued compensation	(260)	(238)
Retail fuel cost over recovery	0	(146)
Other current liabilities	30	(235)
Net cash provided from operating activities	3,579	2,904
Investing Activities:
Property additions	(3,213)	(3,384)
Nuclear decommissioning trust fund purchases	(628)	(930)
Nuclear decommissioning trust fund sales	624	926
Cost of removal, net of salvage	(377)	(184)
Proceeds from dispositions	119	25
Other investing activities	96	(20)
Net cash used for investing activities	(3,460)	(4,026)
Financing Activities:
Increase (decrease) in notes payable, net	263	492
Proceeds —
Short-term borrowings	1,200	325
Redemptions and repurchases —
Short-term borrowings	(400)	(25)
Payment of common stock dividends	(1,425)	(1,377)
Other financing activities	(219)	(167)
Net cash provided from (used for) financing activities	(213)	1,671
Net Change in Cash, Cash Equivalents, and Restricted Cash	(94)	549
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,735	1,617
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	836	884
Income taxes, net	157	88
Noncash transactions —
Accrued property additions at year-end	837	943
GEORGIA POWER CO
Operating Activities:
Net income (loss)	993	494
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	803	772
Deferred income taxes	72	(309)
Allowance for equity funds used during construction	(65)	(61)
Pension, postretirement, and other employee benefits	(114)	(59)
Settlement of asset retirement obligations	(91)	(100)
Storm damage accruals	107	107
Retail fuel cost under recovery – long-term	(538)	0
Estimated loss on Plant Vogtle Units 3 and 4	52	508
Other, net	7	90
Changes in certain current assets and liabilities —
Receivables	(424)	(73)
Fossil fuel stock	31	55
Materials and supplies	(46)	(46)
Other current assets	(25)	15
Accounts payable	235	83
Accrued compensation	(50)	(39)
Retail fuel cost over recovery	0	(113)
Other current liabilities	(21)	(11)
Net cash provided from operating activities	926	1,313
Investing Activities:
Property additions	(1,654)	(1,575)
Nuclear decommissioning trust fund purchases	(448)	(458)
Nuclear decommissioning trust fund sales	444	453
Cost of removal, net of salvage	(207)	(73)
Change in construction payables, net of joint owner portion	51	(72)
Contributions in aid of construction	109	45
Proceeds from dispositions	56	3
Other investing activities	(19)	(53)
Net cash used for investing activities	(1,668)	(1,730)
Financing Activities:
Increase (decrease) in notes payable, net	0	250
Proceeds —
Senior notes	1,500	750
FFB loan	0	371
Short-term borrowings	650	0
Redemptions and repurchases —
Senior notes	(400)	(325)
Pollution control revenue bonds	0	(69)
FFB loan	(45)	(45)
Short-term borrowings	(250)	0
Other long-term debt	(125)	0
Capital contributions from parent company	491	368
Payment of common stock dividends	(845)	(824)
Other financing activities	(37)	(19)
Net cash provided from (used for) financing activities	939	457
Net Change in Cash, Cash Equivalents, and Restricted Cash	197	40
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	33	9
Cash, Cash Equivalents, and Restricted Cash at End of Period	230	49
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	188	182
Income taxes, net	106	139
Noncash transactions —
Accrued property additions at year-end	500	476
Right-of-use assets obtained under operating leases	$ 1	$ 3

Condensed Statements of Cash _4

Condensed Statements of Cash Flows (Unaudited) - GPC (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net cash paid for capitalized interest	$ 46	$ 43
GEORGIA POWER CO
Net cash paid for capitalized interest	$ 33	$ 30

Condensed Balance Sheets (Una_2

Condensed Balance Sheets (Unaudited) - GPC - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 1,724	$ 1,798
Receivables —
Customer accounts	2,277	1,806
Unbilled revenues	807	711
Other accounts and notes	534	523
Fossil fuel for generation	431	450
Materials and supplies	1,641	1,543
Regulatory assets – asset retirement obligations	263	219
Assets from risk management activities	247	151
Other regulatory assets	641	653
Other current assets	212	231
Total current assets	9,781	8,965
Property, Plant, and Equipment:
In service	117,418	115,592
Less: Accumulated depreciation	35,203	34,079
Plant in service, net of depreciation	82,215	81,513
Nuclear fuel, at amortized cost	837	824
Construction work in progress	9,770	8,771
Total property, plant, and equipment	92,822	91,108
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	2,150	2,542
Equity investments in unconsolidated subsidiaries	1,305	1,282
Miscellaneous property and investments	576	653
Total other property and investments	9,736	10,202
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,623	1,701
Deferred charges related to income taxes	843	824
Prepaid pension costs	1,893	1,657
Regulatory assets – asset retirement obligations, deferred	5,982	5,466
Other regulatory assets, deferred	5,448	5,577
Other deferred charges and assets	2,393	1,776
Total deferred charges and other assets	18,430	17,259
Total Assets	130,769	127,534
Current Liabilities:
Securities due within one year	1,052	2,157
Notes payable	2,510	1,440
Accounts payable —
Customer deposits	461	479
Accrued interest	553	533
Accrued compensation	807	1,070
Operating lease obligations	232	250
Asset retirement obligations	693	697
Other regulatory liabilities	557	563
Other current liabilities	1,062	872
Total current liabilities	11,487	10,921
Long-term Debt	51,204	50,120
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	9,620	8,862
Deferred credits related to income taxes	5,318	5,401
Accumulated deferred ITCs	2,175	2,216
Employee benefit obligations	1,509	1,550
Operating lease obligations, deferred	1,464	1,503
Asset retirement obligations, deferred	11,010	10,990
Other deferred credits and liabilities	1,198	816
Total deferred credits and other liabilities	34,823	33,926
Total Liabilities	97,514	94,967
Common Stockholder's Equity (See accompanying statements)	33,013	32,276
Total Liabilities and Stockholders' Equity	130,769	127,534
GEORGIA POWER CO
Current Assets:
Cash and cash equivalents	230	33
Receivables —
Customer accounts	830	547
Unbilled revenues	450	231
Joint owner accounts	44	116
Affiliated	54	25
Other accounts and notes	33	44
Fossil fuel for generation	218	248
Materials and supplies	712	670
Regulatory assets – asset retirement obligations	222	178
Assets from risk management activities	94	48
Other regulatory assets	244	289
Other current assets	124	130
Total current assets	3,255	2,559
Property, Plant, and Equipment:
In service	42,067	41,332
Less: Accumulated depreciation	13,233	12,854
Plant in service, net of depreciation	28,834	28,478
Nuclear fuel, at amortized cost	586	577
Construction work in progress	7,420	6,688
Total property, plant, and equipment	36,840	35,743
Other Property and Investments:
Nuclear decommissioning trusts, at fair value	1,025	1,217
Equity investments in unconsolidated subsidiaries	51	50
Miscellaneous property and investments	75	69
Total other property and investments	1,151	1,336
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,083	1,157
Deferred charges related to income taxes	564	550
Prepaid pension costs	652	563
Deferred under recovered fuel clause revenues	948	410
Regulatory assets – asset retirement obligations, deferred	3,896	3,688
Other regulatory assets, deferred	2,073	1,964
Other deferred charges and assets	512	491
Total deferred charges and other assets	9,728	8,823
Total Assets	50,974	48,461
Current Liabilities:
Securities due within one year	248	675
Notes payable	400	0
Accounts payable —
Affiliated	863	757
Other	892	702
Customer deposits	255	259
Accrued taxes	322	335
Accrued interest	150	136
Accrued compensation	174	232
Operating lease obligations	157	156
Asset retirement obligations	312	317
Other regulatory liabilities	260	280
Other current liabilities	258	254
Total current liabilities	4,291	4,103
Long-term Debt	14,450	13,109
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	3,318	3,019
Deferred credits related to income taxes	2,283	2,321
Accumulated deferred ITCs	323	328
Employee benefit obligations	384	402
Operating lease obligations, deferred	950	999
Asset retirement obligations, deferred	6,537	6,507
Other deferred credits and liabilities	541	439
Total deferred credits and other liabilities	14,336	14,015
Total Liabilities	33,077	31,227
Common Stockholder's Equity (See accompanying statements)	17,897	17,234
Total Liabilities and Stockholders' Equity	$ 50,974	$ 48,461

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, 2020							9
Beginning balance at Dec. 31, 2020	$ 32,234	$ 5,268	$ 11,834	$ 11,311	$ (395)	$ 16,501	$ 398	$ 12,361	$ 3,789	$ (47)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						351			351
Capital contributions from parent company						332		332
Other comprehensive income (loss)	28				28	2				2
Cash dividends on common stock	(678)			(678)		(412)			(412)
Ending balance (in shares) at Mar. 31, 2021							9
Ending balance at Mar. 31, 2021	33,068	5,273	11,854	11,768	(367)	16,774	$ 398	12,693	3,728	(45)
Beginning balance (in shares) at Dec. 31, 2020							9
Beginning balance at Dec. 31, 2020	32,234	5,268	11,834	11,311	(395)	16,501	$ 398	12,361	3,789	(47)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,482					494
Ending balance (in shares) at Jun. 30, 2021							9
Ending balance at Jun. 30, 2021	32,746	5,274	11,886	11,442	(355)	16,546	$ 398	12,733	3,459	(44)
Beginning balance (in shares) at Mar. 31, 2021							9
Beginning balance at Mar. 31, 2021	33,068	5,273	11,854	11,768	(367)	16,774	$ 398	12,693	3,728	(45)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	376					143			143
Capital contributions from parent company						40		40
Other comprehensive income (loss)	12				12	1				1
Cash dividends on common stock	(699)			(699)		(412)			(412)
Ending balance (in shares) at Jun. 30, 2021							9
Ending balance at Jun. 30, 2021	32,746	5,274	11,886	11,442	(355)	16,546	$ 398	12,733	3,459	(44)
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 (loss)	42				42	10				10
Cash dividends on common stock	(702)			(702)		(423)			(423)
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 (loss)	11				11	16				16
Cash dividends on common stock	(723)			(723)		(422)			(422)
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)

Condensed Statements of Commo_3

Condensed Statements of Common Stockholders' Equity (Unaudited) - GPC (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 0.68	$ 0.66	$ 0.66	$ 0.64

Condensed Statements of Incom_3

Condensed Statements of Income (Unaudited) - MPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Total operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Operating Expenses:
Other operations and maintenance	1,558	1,438	3,075	2,810
Depreciation and amortization	913	891	1,805	1,762
Taxes other than income taxes	349	313	721	657
Total operating expenses	5,551	4,490	10,815	8,802
Operating Income	1,655	708	3,039	2,306
Other Income and (Expense):
Interest expense, net of amounts capitalized	(488)	(450)	(950)	(901)
Other income (expense), net	139	101	283	160
Total other income and (expense)	(262)	(344)	(483)	(646)
Earnings (Loss) Before Income Taxes	1,393	364	2,556	1,660
Income taxes (benefit)	304	(12)	477	178
Consolidated Net Income	1,089	376	2,079	1,482
Retail electric revenues
Operating Revenues:
Total operating revenues	4,789	3,599	8,402	6,941
Wholesale Electric
Operating Revenues:
Total operating revenues	937	546	1,601	1,091
Other electric revenues
Operating Revenues:
Total operating revenues	192	175	370	346
Natural Gas
Operating Revenues:
Total operating revenues	1,083	677	3,140	2,371
Other revenues
Operating Revenues:
Total operating revenues	205	201	341	359
Operating Expenses:
Total cost of sales	114	103	183	185
Mississippi Power
Operating Revenues:
Total operating revenues	434	303	769	610
Operating Expenses:
Other operations and maintenance	91	76	167	144
Depreciation and amortization	45	44	90	91
Taxes other than income taxes	32	32	61	63
Total operating expenses	375	254	657	506
Operating Income	59	49	112	104
Other Income and (Expense):
Interest expense, net of amounts capitalized	(14)	(14)	(27)	(29)
Other income (expense), net	12	11	22	20
Total other income and (expense)	(2)	(3)	(5)	(9)
Earnings (Loss) Before Income Taxes	57	46	107	95
Income taxes (benefit)	12	8	20	12
Consolidated Net Income	45	38	87	83
Mississippi Power \| Retail electric revenues
Operating Revenues:
Total operating revenues	252	219	469	422
Mississippi Power \| Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	63	54	131	117
Mississippi Power \| Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	107	25	149	57
Mississippi Power \| Other revenues
Operating Revenues:
Total operating revenues	12	5	20	14
Mississippi Power \| Fuel and purchased power
Operating Expenses:
Total cost of sales	$ 207	$ 102	$ 339	$ 208

Condensed Statements of Compr_5

Condensed Statements of Comprehensive Income - MPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 1,089	$ 376	$ 2,079	$ 1,482
Qualifying hedges:
Reclassification adjustment for amounts included in net income, net of tax	54	(5)	74	50
Total other comprehensive income	11	12	53	40
Comprehensive Income	1,100	388	2,132	1,522
Mississippi Power
Net income	45	38	87	83
Qualifying hedges:
Reclassification adjustment for amounts included in net income, net of tax	0	0	0	1
Total other comprehensive income	0	0	0	1
Comprehensive Income	$ 45	$ 38	$ 87	$ 84

Condensed Statements of Compr_6

Condensed Statements of Comprehensive Income - MPC (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Qualifying hedges, reclassification adjustment, tax	$ 17	$ (1)	$ 24	$ 17
Mississippi Power
Qualifying hedges, reclassification adjustment, tax	$ 0	$ 0	$ 0	$ 0

Condensed Statements of Cash _5

Condensed Statements of Cash Flows (Unaudited) - MPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income (loss)	$ 2,079	$ 1,482
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,995	1,949
Other, net	21	117
Changes in certain current assets and liabilities —
Receivables	(637)	29
Other current assets	12	94
Accounts payable	703	(177)
Accrued taxes	(150)	(157)
Retail fuel cost over recovery	0	(146)
Other current liabilities	30	(235)
Net cash provided from operating activities	3,579	2,904
Investing Activities:
Property additions	(3,213)	(3,384)
Payments pursuant to LTSAs	(81)	(114)
Other investing activities	96	(20)
Net cash used for investing activities	(3,460)	(4,026)
Financing Activities:
Increase (decrease) in notes payable, net	263	492
Payment of common stock dividends	(1,425)	(1,377)
Other financing activities	(219)	(167)
Net cash provided from (used for) financing activities	(213)	1,671
Net Change in Cash, Cash Equivalents, and Restricted Cash	(94)	549
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,735	1,617
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	836	884
Income taxes, net	157	88
Noncash transactions —
Accrued property additions at year-end	837	943
Mississippi Power
Operating Activities:
Net income (loss)	87	83
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	110	106
Other, net	13	(28)
Changes in certain current assets and liabilities —
Receivables	(92)	1
Retail fuel cost under recovery	(25)	0
Other current assets	(23)	(4)
Accounts payable	79	(33)
Accrued taxes	(36)	(51)
Retail fuel cost over recovery	0	(15)
Other current liabilities	(1)	(18)
Net cash provided from operating activities	112	41
Investing Activities:
Property additions	(87)	(90)
Construction payables	(16)	(3)
Payments pursuant to LTSAs	(15)	(14)
Other investing activities	(15)	(10)
Net cash used for investing activities	(133)	(117)
Financing Activities:
Increase (decrease) in notes payable, net	16
Increase (decrease) in notes payable, net		(25)
Proceeds — Senior notes	0	525
Capital contributions from parent company	51	101
Payment of common stock dividends	(85)	(79)
Other financing activities	0	(7)
Net cash provided from (used for) financing activities	(18)	515
Net Change in Cash, Cash Equivalents, and Restricted Cash	(39)	439
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	61	39
Cash, Cash Equivalents, and Restricted Cash at End of Period	22	478
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	26	31
Income taxes, net	5	7
Noncash transactions —
Accrued property additions at year-end	$ 9	$ 31

Condensed Statements of Cash _6

Condensed Statements of Cash Flows (Unaudited) - MPC (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net cash paid for capitalized interest	$ 46	$ 43

Condensed Balance Sheets (Una_3

Condensed Balance Sheets (Unaudited) - MPC - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 1,724	$ 1,798
Receivables —
Customer accounts	2,277	1,806
Unbilled revenues	807	711
Other accounts and notes	534	523
Fossil fuel for generation	431	450
Materials and supplies	1,641	1,543
Assets from risk management activities	247	151
Other regulatory assets	641	653
Other current assets	212	231
Total current assets	9,781	8,965
Property, Plant, and Equipment:
In service	117,418	115,592
Less: Accumulated depreciation	35,203	34,079
Plant in service, net of depreciation	82,215	81,513
Construction work in progress	9,770	8,771
Total property, plant, and equipment	92,822	91,108
Other Property and Investments:
Total other property and investments	9,736	10,202
Deferred Charges and Other Assets:
Deferred charges related to income taxes	843	824
Regulatory assets – asset retirement obligations, deferred	5,982	5,466
Other regulatory assets, deferred	5,448	5,577
Other deferred charges and assets	2,393	1,776
Total deferred charges and other assets	18,430	17,259
Total Assets	130,769	127,534
Current Liabilities:
Securities due within one year	1,052	2,157
Notes payable	2,510	1,440
Accounts payable —
Accrued compensation	807	1,070
Asset retirement obligations	693	697
Other regulatory liabilities	557	563
Other current liabilities	1,062	872
Total current liabilities	11,487	10,921
Long-term Debt	51,204	50,120
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	9,620	8,862
Deferred credits related to income taxes	5,318	5,401
Employee benefit obligations	1,509	1,550
Asset retirement obligations, deferred	11,010	10,990
Other cost of removal obligations	1,993	2,103
Other regulatory liabilities, deferred	536	485
Other deferred credits and liabilities	1,198	816
Total deferred credits and other liabilities	34,823	33,926
Total Liabilities	97,514	94,967
Total Liabilities and Stockholders' Equity	130,769	127,534
Mississippi Power
Current Assets:
Cash and cash equivalents	22	61
Receivables —
Customer accounts	89	37
Unbilled revenues	44	34
Affiliated	76	29
Other accounts and notes	37	28
Fossil fuel for generation	33	28
Materials and supplies	76	70
Assets from risk management activities	62	28
Other regulatory assets	62	54
Other current assets	15	13
Total current assets	516	382
Property, Plant, and Equipment:
In service	5,197	5,106
Less: Accumulated depreciation	1,648	1,591
Plant in service, net of depreciation	3,549	3,515
Construction work in progress	127	127
Total property, plant, and equipment	3,676	3,642
Other Property and Investments:
Total other property and investments	175	179
Deferred Charges and Other Assets:
Deferred charges related to income taxes	30	31
Prepaid pension costs	91	79
Regulatory assets – asset retirement obligations, deferred	236	232
Other regulatory assets, deferred	286	317
Accumulated deferred income taxes	112	118
Other deferred charges and assets	129	100
Total deferred charges and other assets	884	877
Total Assets	5,251	5,080
Current Liabilities:
Securities due within one year	1	1
Notes payable	16	0
Accounts payable —
Affiliated	129	81
Other	62	47
Accrued taxes	83	120
Accrued compensation	28	36
Asset retirement obligations	24	30
Other regulatory liabilities	92	59
Other current liabilities	96	65
Total current liabilities	531	439
Long-term Debt	1,510	1,510
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	466	464
Deferred credits related to income taxes	265	269
Employee benefit obligations	88	88
Asset retirement obligations, deferred	162	160
Other cost of removal obligations	193	195
Other regulatory liabilities, deferred	91	64
Other deferred credits and liabilities	24	24
Total deferred credits and other liabilities	1,289	1,264
Total Liabilities	3,330	3,213
Total common stockholders' equity	1,921	1,867
Total Liabilities and Stockholders' Equity	$ 5,251	$ 5,080

Condensed Statements of Commo_4

Condensed Statements of Common Stockholders' Equity (Unaudited) - MPC - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Mississippi Power	Mississippi Power Common Stock	Mississippi Power Paid-In Capital	Mississippi Power Retained Earnings (Accumulated Deficit)	Mississippi Power Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2020							1
Beginning balance at Dec. 31, 2020	$ 32,234	$ 5,268	$ 11,834	$ 11,311	$ (395)	$ 1,742	$ 38	$ 4,460	$ (2,754)	$ (2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						45			45
Capital contributions from parent company						100		100
Cash dividends on common stock	(678)			(678)		(39)			(39)
Other	1		2
Ending balance (in shares) at Mar. 31, 2021							1
Ending balance at Mar. 31, 2021	33,068	5,273	11,854	11,768	(367)	1,848	$ 38	4,560	(2,748)	(2)
Beginning balance (in shares) at Dec. 31, 2020							1
Beginning balance at Dec. 31, 2020	32,234	5,268	11,834	11,311	(395)	1,742	$ 38	4,460	(2,754)	(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,508
Ending balance (in shares) at Jun. 30, 2021							1
Ending balance at Jun. 30, 2021	32,746	5,274	11,886	11,442	(355)	1,849	$ 38	4,562	(2,750)	(1)
Beginning balance (in shares) at Mar. 31, 2021							1
Beginning balance at Mar. 31, 2021	33,068	5,273	11,854	11,768	(367)	1,848	$ 38	4,560	(2,748)	(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	372					38			38
Capital contributions from parent company						2		2
Cash dividends on common stock	(699)			(699)		(39)			(39)
Other	0		1	1					(1)	1
Ending balance (in shares) at Jun. 30, 2021							1
Ending balance at Jun. 30, 2021	32,746	5,274	11,886	11,442	(355)	1,849	$ 38	4,562	(2,750)	(1)
Beginning balance (in shares) at Dec. 31, 2021							1
Beginning balance at Dec. 31, 2021	32,276	5,279	11,950	10,929	(237)	1,867	$ 38	4,582	(2,753)	0
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)
Other	7		7	2
Ending balance (in shares) at Mar. 31, 2022							1
Ending balance at Mar. 31, 2022	32,629	5,286	11,994	11,261	(195)	1,917	$ 38	4,633	(2,754)	0
Beginning balance (in shares) at Dec. 31, 2021							1
Beginning balance at Dec. 31, 2021	32,276	5,279	11,950	10,929	(237)	1,867	$ 38	4,582	(2,753)	0
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	(184)	1,921	$ 38	4,634	(2,751)	0
Beginning balance (in shares) at Mar. 31, 2022							1
Beginning balance at Mar. 31, 2022	32,629	5,286	11,994	11,261	(195)	1,917	$ 38	4,633	(2,754)	0
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)
Other	2		4
Ending balance (in shares) at Jun. 30, 2022							1
Ending balance at Jun. 30, 2022	$ 33,013	$ 5,288	$ 12,033	$ 11,645	$ (184)	$ 1,921	$ 38	$ 4,634	$ (2,751)	$ 0

Condensed Consolidated Statem_9

Condensed Consolidated Statements of Income (Unaudited) - SPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Total operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Operating Expenses:
Other operations and maintenance	1,558	1,438	3,075	2,810
Depreciation and amortization	913	891	1,805	1,762
Taxes other than income taxes	349	313	721	657
Gain on dispositions, net	(10)	(11)	(33)	(54)
Total operating expenses	5,551	4,490	10,815	8,802
Operating Income	1,655	708	3,039	2,306
Other Income and (Expense):
Interest expense, net of amounts capitalized	(488)	(450)	(950)	(901)
Other income (expense), net	139	101	283	160
Total other income and (expense)	(262)	(344)	(483)	(646)
Earnings (Loss) Before Income Taxes	1,393	364	2,556	1,660
Income taxes (benefit)	304	(12)	477	178
Consolidated Net Income	1,089	376	2,079	1,482
Net loss attributable to noncontrolling interests	(22)	0	(67)	(33)
Net Income	1,107	372	2,139	1,508
Retail electric revenues
Operating Revenues:
Total operating revenues	4,789	3,599	8,402	6,941
Wholesale Electric
Operating Revenues:
Total operating revenues	937	546	1,601	1,091
Other electric revenues
Operating Revenues:
Total operating revenues	192	175	370	346
Natural Gas
Operating Revenues:
Total operating revenues	1,083	677	3,140	2,371
Other revenues
Operating Revenues:
Total operating revenues	205	201	341	359
Operating Expenses:
Total cost of sales	114	103	183	185
Fuel
Operating Expenses:
Total cost of sales	1,715	848	2,826	1,696
Purchased power
Operating Expenses:
Total cost of sales	408	217	640	424
SOUTHERN POWER CO
Operating Revenues:
Total operating revenues	899	490	1,438	930
Operating Expenses:
Other operations and maintenance	115	111	220	211
Depreciation and amortization	131	132	251	251
Taxes other than income taxes	12	12	25	24
Gain on dispositions, net	0	0	(2)	(39)
Total operating expenses	763	420	1,252	774
Operating Income	136	70	186	156
Other Income and (Expense):
Interest expense, net of amounts capitalized	(36)	(37)	(73)	(75)
Other income (expense), net	1	1	3	8
Total other income and (expense)	(35)	(36)	(70)	(67)
Earnings (Loss) Before Income Taxes	101	34	116	89
Income taxes (benefit)	25	(2)	13	(11)
Consolidated Net Income	76	36	103	100
Net loss attributable to noncontrolling interests	(22)	0	(67)	(33)
Net Income	98	36	170	133
SOUTHERN POWER CO \| Wholesale revenues, non-affiliates
Operating Revenues:
Total operating revenues	658	373	1,084	728
SOUTHERN POWER CO \| Wholesale revenues, affiliates
Operating Revenues:
Total operating revenues	232	112	337	193
SOUTHERN POWER CO \| Other revenues
Operating Revenues:
Total operating revenues	9	5	17	9
SOUTHERN POWER CO \| Fuel
Operating Expenses:
Total cost of sales	437	140	669	281
SOUTHERN POWER CO \| Purchased power
Operating Expenses:
Total cost of sales	$ 68	$ 25	$ 89	$ 46

Condensed Consolidated State_10

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - SPC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 1,089	$ 376	$ 2,079	$ 1,482
Qualifying hedges:
Changes in fair value, net of tax	(45)	14	(26)	(16)
Reclassification adjustment for amounts included in net income, net of tax	54	(5)	74	50
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	2	3	5	6
Total other comprehensive income	11	12	53	40
Comprehensive Income	1,100	388	2,132	1,522
Comprehensive loss attributable to noncontrolling interests	(22)	0	(67)	(33)
Comprehensive Income	1,118	384	2,192	1,548
SOUTHERN POWER CO
Net income	76	36	103	100
Qualifying hedges:
Changes in fair value, net of tax	(54)	6	(72)	(26)
Reclassification adjustment for amounts included in net income, net of tax	57	(9)	79	38
Pension and other postretirement benefit plans:
Reclassification adjustment for amounts included in net income, net of tax	0	0	1	1
Total other comprehensive income	3	(3)	8	13
Comprehensive Income	79	33	111	113
Comprehensive loss attributable to noncontrolling interests	(22)	0	(67)	(33)
Comprehensive Income	$ 101	$ 33	$ 178	$ 146

Condensed Consolidated State_11

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - SPC (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Changes in fair value, tax	$ (15)	$ 5	$ (7)	$ (5)
Qualifying hedges, reclassification adjustment, tax	17	(1)	24	17
Reclassification adjustment for amounts included in net income, tax	1	2	2	3
SOUTHERN POWER CO
Changes in fair value, tax	(18)	2	(23)	(8)
Qualifying hedges, reclassification adjustment, tax	19	(3)	26	13
Reclassification adjustment for amounts included in net income, tax	$ 0	$ 1	$ 0	$ 1

Condensed Consolidated State_12

Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income (loss)	$ 2,079	$ 1,482
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,995	1,949
Deferred income taxes	240	(101)
Utilization of federal investment tax credits	281	224
Other, net	21	117
Changes in certain current assets and liabilities —
Receivables	(637)	29
Other current assets	12	94
Accounts payable	703	(177)
Accrued taxes	(150)	(157)
Other current liabilities	30	(235)
Net cash provided from operating activities	3,579	2,904
Investing Activities:
Business acquisitions, net of cash acquired	0	(345)
Property additions	(3,213)	(3,384)
Payments pursuant to LTSAs	(81)	(114)
Other investing activities	96	(20)
Net cash used for investing activities	(3,460)	(4,026)
Financing Activities:
Increase (decrease) in notes payable, net	263	492
Proceeds —
Capital contributions from noncontrolling interests	73	343
Distributions to noncontrolling interests	(115)	(113)
Payment of common stock dividends	(1,425)	(1,377)
Other financing activities	(219)	(167)
Net cash provided from (used for) financing activities	(213)	1,671
Net Change in Cash, Cash Equivalents, and Restricted Cash	(94)	549
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,735	1,617
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	836	884
Income taxes, net	157	88
Noncash transactions —
Contributions from noncontrolling interests	0	89
Contributions of wind turbine equipment	0	82
Accrued property additions at year-end	837	943
Reassessment of right-of-use assets under operating leases	40	0
SOUTHERN POWER CO
Operating Activities:
Net income (loss)	103	100
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	264	264
Deferred income taxes	14	(20)
Utilization of federal investment tax credits	239	205
Amortization of investment tax credits	(29)	(29)
Gain on dispositions, net	(2)	(39)
Other, net	(25)	(18)
Changes in certain current assets and liabilities —
Receivables	(161)	(91)
Prepaid income taxes	22	28
Other current assets	(6)	2
Accounts payable	114	14
Accrued taxes	42	8
Other current liabilities	(23)	(13)
Net cash provided from operating activities	552	411
Investing Activities:
Business acquisitions, net of cash acquired	0	(345)
Property additions	(34)	(224)
Proceeds from dispositions	48	17
Change in construction payables	(54)	(14)
Payments pursuant to LTSAs	(33)	(47)
Other investing activities	0	12
Net cash used for investing activities	(73)	(601)
Financing Activities:
Increase (decrease) in notes payable, net	94
Increase (decrease) in notes payable, net		(56)
Proceeds —
Senior notes	0	400
Capital contributions from parent company	326	4
Redemptions — Senior notes	(677)	0
Return of capital to parent company	0	(271)
Capital contributions from noncontrolling interests	73	343
Distributions to noncontrolling interests	(115)	(113)
Payment of common stock dividends	(99)	(102)
Other financing activities	(5)	(9)
Net cash provided from (used for) financing activities	(403)	196
Net Change in Cash, Cash Equivalents, and Restricted Cash	76	6
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	135	183
Cash, Cash Equivalents, and Restricted Cash at End of Period	211	189
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	91	91
Income taxes, net	(263)	(189)
Noncash transactions —
Contributions from noncontrolling interests	0	89
Contributions of wind turbine equipment	0	82
Accrued property additions at year-end	28	59
Right-of-use assets obtained under operating leases	0	65
Reassessment of right-of-use assets under operating leases	$ 40	$ 0

Condensed Consolidated State_13

Condensed Consolidated Statements of Cash Flows (Unaudited) - SPC (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net cash paid for capitalized interest	$ 46	$ 43
SOUTHERN POWER CO
Net cash paid for capitalized interest	$ 0	$ 2

Condensed Consolidated Balanc_3

Condensed Consolidated Balance Sheets (Unaudited) - SPC - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 1,724	$ 1,798
Receivables —
Customer accounts	2,277	1,806
Other accounts and notes	534	523
Materials and supplies	1,641	1,543
Other current assets	212	231
Total current assets	9,781	8,965
Property, Plant, and Equipment:
In service	117,418	115,592
Less: Accumulated depreciation	35,203	34,079
Plant in service, net of depreciation	82,215	81,513
Construction work in progress	9,770	8,771
Total property, plant, and equipment	92,822	91,108
Other Property and Investments:
Equity investments in unconsolidated subsidiaries	1,305	1,282
Total other property and investments	9,736	10,202
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,623	1,701
Other deferred charges and assets	2,393	1,776
Total deferred charges and other assets	18,430	17,259
Total Assets	130,769	127,534
Current Liabilities:
Securities due within one year	1,052	2,157
Notes payable	2,510	1,440
Accounts payable —
Accrued interest	553	533
Other current liabilities	1,062	872
Total current liabilities	11,487	10,921
Long-term Debt	51,204	50,120
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	9,620	8,862
Accumulated deferred ITCs	2,175	2,216
Operating lease obligations, deferred	1,464	1,503
Other deferred credits and liabilities	1,198	816
Total deferred credits and other liabilities	34,823	33,926
Total Liabilities	97,514	94,967
Total Stockholders' Equity (See accompanying statements)	33,013	32,276
Total Liabilities and Stockholders' Equity	130,769	127,534
SOUTHERN POWER CO
Current Assets:
Cash and cash equivalents	202	107
Receivables —
Customer accounts	278	139
Affiliated	83	51
Other accounts and notes	19	29
Materials and supplies	108	106
Prepaid income taxes	5	27
Other current assets	48	46
Total current assets	743	505
Property, Plant, and Equipment:
In service	14,637	14,585
Less: Accumulated depreciation	3,462	3,241
Plant in service, net of depreciation	11,175	11,344
Construction work in progress	34	45
Total property, plant, and equipment	11,209	11,389
Other Property and Investments:
Intangible assets, net of amortization	274	282
Equity investments in unconsolidated subsidiaries	49	86
Net investment in sales-type leases	156	161
Total other property and investments	479	529
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	493	479
Prepaid LTSAs	192	210
Other deferred charges and assets	286	278
Total deferred charges and other assets	971	967
Total Assets	13,402	13,390
Current Liabilities:
Securities due within one year	0	679
Notes payable	306	211
Accounts payable —
Affiliated	192	92
Other	77	85
Accrued taxes	56	14
Accrued interest	24	32
Other current liabilities	89	140
Total current liabilities	744	1,253
Long-term Debt	2,964	3,009
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	471	215
Accumulated deferred ITCs	1,585	1,614
Operating lease obligations, deferred	514	497
Other deferred credits and liabilities	245	204
Total deferred credits and other liabilities	2,815	2,530
Total Liabilities	6,523	6,792
Total Stockholders' Equity (See accompanying statements)	6,879	6,598
Total Liabilities and Stockholders' Equity	$ 13,402	$ 13,390

Condensed Consolidated Balanc_4

Condensed Consolidated Balance Sheets (Unaudited) - SPC (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other intangible assets, amortization	$ 326	$ 307
SOUTHERN POWER CO
Other intangible assets, amortization	$ 119	$ 109

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, 2020	$ 32,234	$ 11,834	$ 11,311	$ (395)	$ 4,262	$ 6,631	$ 2,369	$ 914	$ 1,522	$ (67)	$ 4,262
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						65	97		97		(32)
Return of capital to parent company						(271)	(271)	(271)
Other comprehensive income (loss)	28			28		16	16			16
Cash dividends on common stock	(678)		(678)			(51)	(51)		(51)
Capital contributions from noncontrolling interests	403				403	403					403
Distributions to noncontrolling interests	(46)				(46)	(46)					(46)
Other	1	2			(1)	(3)	(2)	(2)	1	(1)	(1)
Ending balance at Mar. 31, 2021	33,068	11,854	11,768	(367)	4,586	6,744	2,158	641	1,569	(52)	4,586
Beginning balance at Dec. 31, 2020	32,234	11,834	11,311	(395)	4,262	6,631	2,369	914	1,522	(67)	4,262
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,482					100
Ending balance at Jun. 30, 2021	32,746	11,886	11,442	(355)	4,547	6,690	2,143	643	1,554	(54)	4,547
Beginning balance at Mar. 31, 2021	33,068	11,854	11,768	(367)	4,586	6,744	2,158	641	1,569	(52)	4,586
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	376					36	36		36		0
Other comprehensive income (loss)	12			12		(3)	(3)			(3)
Cash dividends on common stock	(699)		(699)			(51)	(51)		(51)
Capital contributions from noncontrolling interests	29				29	29					29
Distributions to noncontrolling interests	(68)				(68)	(68)					(68)
Other	0	1	1			3	3	2		1
Ending balance at Jun. 30, 2021	32,746	11,886	11,442	(355)	4,547	6,690	2,143	643	1,554	(54)	4,547
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 (loss)	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 (loss)	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

Condensed Consolidated State_15

Condensed Consolidated Statements of Income (Unaudited) - GAS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Total operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Operating Expenses:
Other operations and maintenance	1,558	1,438	3,075	2,810
Depreciation and amortization	913	891	1,805	1,762
Taxes other than income taxes	349	313	721	657
Total operating expenses	5,551	4,490	10,815	8,802
Operating Income	1,655	708	3,039	2,306
Other Income and (Expense):
Earnings (loss) from equity method investments	34	(40)	80	5
Interest expense, net of amounts capitalized	(488)	(450)	(950)	(901)
Other income (expense), net	139	101	283	160
Total other income and (expense)	(262)	(344)	(483)	(646)
Earnings (Loss) Before Income Taxes	1,393	364	2,556	1,660
Income taxes (benefit)	304	(12)	477	178
Consolidated Net Income	1,089	376	2,079	1,482
Retail electric revenues
Operating Revenues:
Total operating revenues	4,789	3,599	8,402	6,941
Wholesale Electric
Operating Revenues:
Total operating revenues	937	546	1,601	1,091
Other electric revenues
Operating Revenues:
Total operating revenues	192	175	370	346
Natural Gas
Operating Revenues:
Total operating revenues	1,083	677	3,140	2,371
Natural gas
Operating Expenses:
Total cost of sales	452	231	1,546	814
Alternative revenue programs
Operating Revenues:
Total operating revenues	2	2	1	4
Other revenues
Operating Revenues:
Total operating revenues	205	201	341	359
Operating Expenses:
Total cost of sales	114	103	183	185
SOUTHERN Co GAS
Operating Revenues:
Total operating revenues	$ 1,083	$ 677	$ 3,140	$ 2,371
Operating Expenses:
Cost, Product and Service [Extensible Enumeration]	Natural gas	Natural gas	Natural gas	Natural gas
Other operations and maintenance	$ 266	$ 233	$ 570	$ 532
Depreciation and amortization	138	133	275	263
Taxes other than income taxes	62	49	163	130
Total operating expenses	918	646	2,554	1,739
Operating Income	165	31	586	632
Other Income and (Expense):
Earnings (loss) from equity method investments	31	(52)	71	(11)
Interest expense, net of amounts capitalized	(61)	(59)	(122)	(118)
Other income (expense), net	16	(14)	32	(78)
Total other income and (expense)	(14)	(125)	(19)	(207)
Earnings (Loss) Before Income Taxes	151	(94)	567	425
Income taxes (benefit)	36	(29)	134	92
Consolidated Net Income	115	(65)	433	333
SOUTHERN Co GAS \| Natural gas
Operating Revenues:
Total operating revenues	1,081	675	3,139	2,367
Operating Expenses:
Total cost of sales	452	231	1,546	814
SOUTHERN Co GAS \| Alternative revenue programs
Operating Revenues:
Total operating revenues	$ 2	$ 2	$ 1	$ 4

Condensed Consolidated State_16

Condensed Consolidated Statements of Income (Unaudited) - GAS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
SOUTHERN Co GAS
Revenue taxes collected	$ 33	$ 23	$ 104	$ 77

Condensed Consolidated State_17

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - GAS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 1,089	$ 376	$ 2,079	$ 1,482
Qualifying hedges:
Changes in fair value, net of tax	(45)	14	(26)	(16)
Reclassification adjustment for amounts included in net income, net of tax	54	(5)	74	50
Total other comprehensive income	11	12	53	40
Comprehensive Income	1,100	388	2,132	1,522
SOUTHERN Co GAS
Net income	115	(65)	433	333
Qualifying hedges:
Changes in fair value, net of tax	(5)	8	22	9
Reclassification adjustment for amounts included in net income, net of tax	(7)	0	(13)	3
Total other comprehensive income	(12)	8	9	12
Comprehensive Income	$ 103	$ (57)	$ 442	$ 345

Condensed Consolidated State_18

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - GAS (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Changes in fair value, tax	$ (15)	$ 5	$ (7)	$ (5)
Qualifying hedges, reclassification adjustment, tax	17	(1)	24	17
SOUTHERN Co GAS
Changes in fair value, tax	(2)	3	8	3
Qualifying hedges, reclassification adjustment, tax	$ (3)	$ 0	$ (5)	$ 1

Condensed Consolidated State_19

Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income (loss)	$ 2,079	$ 1,482
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	1,995	1,949
Deferred income taxes	240	(101)
Mark-to-market adjustments	14	136
Natural gas cost under recovery – long-term	192	(119)
Other, net	21	117
Changes in certain current assets and liabilities —
Receivables	(637)	29
Natural gas for sale, net of temporary LIFO liquidation	335	375
Natural gas cost under recovery	(94)	(485)
Other current assets	12	94
Accounts payable	703	(177)
Accrued taxes	(150)	(157)
Other current liabilities	30	(235)
Net cash provided from operating activities	3,579	2,904
Investing Activities:
Property additions	(3,213)	(3,384)
Cost of removal, net of salvage	(377)	(184)
Other investing activities	96	(20)
Net cash used for investing activities	(3,460)	(4,026)
Financing Activities:
Increase (decrease) in notes payable, net	263	492
Proceeds —
Proceeds - Short-term borrowings	1,200	325
Redemptions and repurchases —
Short-term borrowings	(400)	(25)
Payment of common stock dividends	(1,425)	(1,377)
Net cash provided from (used for) financing activities	(213)	1,671
Net Change in Cash, Cash Equivalents, and Restricted Cash	(94)	549
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	1,829	1,068
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,735	1,617
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	836	884
Income taxes, net	157	88
Noncash transactions —
Accrued property additions at year-end	837	943
SOUTHERN Co GAS
Operating Activities:
Net income (loss)	433	333
Adjustments to reconcile net income to net cash provided from operating activities —
Depreciation and amortization, total	275	263
Deferred income taxes	35	110
Mark-to-market adjustments	13	137
Impairment of PennEast Pipeline investment	0	82
Natural gas cost under recovery – long-term	192	(119)
Other, net	42	15
Changes in certain current assets and liabilities —
Receivables	244	262
Natural gas for sale, net of temporary LIFO liquidation	335	375
Prepaid income taxes	(70)	(129)
Natural gas cost under recovery	(94)	(485)
Other current assets	19	7
Accounts payable	101	(42)
Accrued taxes	(41)	1
Other current liabilities	(6)	(88)
Net cash provided from operating activities	1,478	722
Investing Activities:
Property additions	(637)	(635)
Cost of removal, net of salvage	(53)	(44)
Other investing activities	32	11
Net cash used for investing activities	(658)	(668)
Financing Activities:
Increase (decrease) in notes payable, net	(593)
Increase (decrease) in notes payable, net		210
Proceeds —
Proceeds - Short-term borrowings	50	300
Redemptions and repurchases —
Short-term borrowings	(150)	0
Senior notes	0	300
Medium-term notes	(46)	(30)
Capital contributions from parent company	349	60
Payment of common stock dividends	(260)	(265)
Net cash provided from (used for) financing activities	(650)	(25)
Net Change in Cash, Cash Equivalents, and Restricted Cash	170	29
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	48	19
Cash, Cash Equivalents, and Restricted Cash at End of Period	218	48
Supplemental Cash Flow Information:
Interest, net of amounts capitalized	129	127
Income taxes, net	210	100
Noncash transactions —
Accrued property additions at year-end	$ 126	$ 137

Condensed Consolidated State_20

Condensed Consolidated Statements of Cash Flows (Unaudited) - GAS (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net cash paid for capitalized interest	$ 46	$ 43
SOUTHERN Co GAS
Net cash paid for capitalized interest	$ 4	$ 3

Condensed Consolidated Balanc_5

Condensed Consolidated Balance Sheets (Unaudited) - GAS - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 1,724	$ 1,798
Receivables —
Customer accounts	2,277	1,806
Unbilled revenues	807	711
Other accounts and notes	534	523
Accumulated provision for uncollectible accounts	(94)	(78)
Natural gas for sale	209	362
Prepaid expenses	528	330
Assets from risk management activities, net of collateral	247	151
Natural gas cost under recovery	361	266
Other regulatory assets	641	653
Other current assets	212	231
Total current assets	9,781	8,965
Property, Plant, and Equipment:
In service	117,418	115,592
Less: Accumulated depreciation	35,203	34,079
Plant in service, net of depreciation	82,215	81,513
Construction work in progress	9,770	8,771
Total property, plant, and equipment	92,822	91,108
Other Property and Investments:
Goodwill	5,280	5,280
Equity investments in unconsolidated subsidiaries	1,305	1,282
Other intangible assets, net of amortization	425	445
Miscellaneous property and investments	576	653
Total other property and investments	9,736	10,202
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	1,623	1,701
Prepaid pension costs	1,893	1,657
Other regulatory assets, deferred	5,448	5,577
Other deferred charges and assets	2,393	1,776
Total deferred charges and other assets	18,430	17,259
Total Assets	130,769	127,534
Current Liabilities:
Securities due within one year	1,052	2,157
Notes payable	2,510	1,440
Accounts payable —
Customer deposits	461	479
Accrued interest	553	533
Accrued compensation	807	1,070
Other regulatory liabilities	557	563
Other current liabilities	1,062	872
Total current liabilities	11,487	10,921
Long-term Debt	51,204	50,120
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	9,620	8,862
Deferred credits related to income taxes	5,318	5,401
Employee benefit obligations	1,509	1,550
Operating lease obligations, deferred	1,464	1,503
Other cost of removal obligations	1,993	2,103
Other deferred credits and liabilities	1,198	816
Total deferred credits and other liabilities	34,823	33,926
Total Liabilities	97,514	94,967
Common Stockholder's Equity (See accompanying statements)	33,013	32,276
Total Liabilities and Stockholders' Equity	130,769	127,534
SOUTHERN Co GAS
Current Assets:
Cash and cash equivalents	217	45
Receivables —
Customer accounts	379	462
Unbilled revenues	109	278
Other accounts and notes	53	49
Accumulated provision for uncollectible accounts	(55)	(39)
Natural gas for sale	209	362
Prepaid expenses	185	114
Assets from risk management activities, net of collateral	22	33
Natural gas cost under recovery	361	266
Other regulatory assets	105	136
Other current assets	53	49
Total current assets	1,638	1,755
Property, Plant, and Equipment:
In service	19,362	18,880
Less: Accumulated depreciation	5,201	5,067
Plant in service, net of depreciation	14,161	13,813
Construction work in progress	776	684
Total property, plant, and equipment	14,937	14,497
Other Property and Investments:
Goodwill	5,015	5,015
Equity investments in unconsolidated subsidiaries	1,134	1,173
Other intangible assets, net of amortization	31	37
Miscellaneous property and investments	19	19
Total other property and investments	6,199	6,244
Deferred Charges and Other Assets:
Operating lease right-of-use assets, net of amortization	63	70
Prepaid pension costs	192	175
Other regulatory assets, deferred	459	689
Other deferred charges and assets	130	130
Total deferred charges and other assets	844	1,064
Total Assets	23,618	23,560
Current Liabilities:
Securities due within one year	0	47
Notes payable	516	1,209
Accounts payable —
Affiliated	54	58
Other	494	361
Customer deposits	81	95
Accrued taxes	74	124
Accrued interest	58	59
Accrued compensation	91	110
Temporary LIFO liquidation	177	0
Other regulatory liabilities	37	8
Other current liabilities	161	155
Total current liabilities	1,743	2,226
Long-term Debt	6,785	6,855
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	1,595	1,555
Deferred credits related to income taxes	800	816
Employee benefit obligations	168	176
Operating lease obligations, deferred	55	59
Other cost of removal obligations	1,694	1,683
Accrued environmental remediation	181	197
Other deferred credits and liabilities	137	77
Total deferred credits and other liabilities	4,630	4,563
Total Liabilities	13,158	13,644
Common Stockholder's Equity (See accompanying statements)	10,460	9,916
Total Liabilities and Stockholders' Equity	$ 23,618	$ 23,560

Condensed Consolidated Balanc_6

Condensed Consolidated Balance Sheets (Unaudited) - GAS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other intangible assets, amortization	$ 326	$ 307
SOUTHERN Co GAS
Other intangible assets, amortization	$ 151	$ 145

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, 2020	$ 32,234	$ 11,834	$ 11,311	$ (395)	$ 9,767	$ 9,930	$ (141)	$ (22)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income					398		398
Capital contributions from parent company					57	57
Other comprehensive income (loss)	28			28	4			4
Cash dividends on common stock	(678)		(678)		(132)		(132)
Ending balance at Mar. 31, 2021	33,068	11,854	11,768	(367)	10,094	9,987	125	(18)
Beginning balance at Dec. 31, 2020	32,234	11,834	11,311	(395)	9,767	9,930	(141)	(22)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,482				333
Ending balance at Jun. 30, 2021	32,746	11,886	11,442	(355)	9,929	10,012	(73)	(10)
Beginning balance at Mar. 31, 2021	33,068	11,854	11,768	(367)	10,094	9,987	125	(18)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	376				(65)		(65)
Capital contributions from parent company					25	25
Other comprehensive income (loss)	12			12	8			8
Cash dividends on common stock	(699)		(699)		(133)		(133)
Ending balance at Jun. 30, 2021	32,746	11,886	11,442	(355)	9,929	10,012	(73)	(10)
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 (loss)	42			42	20			20
Cash dividends on common stock	(702)		(702)		(130)		(130)
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 (loss)	11			11	(12)			(12)
Cash dividends on common stock	(723)		(723)		(130)		(130)
Ending balance at Jun. 30, 2022	$ 33,013	$ 12,033	$ 11,645	$ (184)	$ 10,460	$ 10,386	$ 42	$ 32

Introduction

Introduction	6 Months Ended
Introduction	Jun. 30, 2022
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, 2021 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, 2022 and 2021. 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, 2022 and December 31, 2021 was as follows: Goodwill (in millions) Southern Company $ 5,280 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 impairment indicators arise. Other intangible assets were as follows: At June 30, 2022 At December 31, 2021 Gross Carrying Amount Accumulated Amortization Other Gross Carrying Amount Accumulated Amortization Other (in millions) (in millions) Southern Company Other intangible assets subject to amortization: Customer relationships $ 212 $ (157) $ 55 $ 212 $ (150) $ 62 Trade names 64 (41) 23 64 (38) 26 PPA fair value adjustments 390 (119) 271 390 (109) 281 Other 10 (9) 1 11 (10) 1 Total other intangible assets subject to amortization $ 676 $ (326) $ 350 $ 677 $ (307) $ 370 Other intangible assets not subject to amortization: Federal Communications Commission licenses 75 — 75 75 — 75 Total other intangible assets $ 751 $ (326) $ 425 $ 752 $ (307) $ 445 Southern Power Other intangible assets subject to amortization: PPA fair value adjustments $ 390 $ (119) $ 271 $ 390 $ (109) $ 281 Southern Company Gas Other intangible assets subject to amortization: Gas marketing services Customer relationships $ 156 $ (135) $ 21 $ 156 $ (130) $ 26 Trade names 26 (16) 10 26 (15) 11 Total other intangible assets subject to amortization $ 182 $ (151) $ 31 $ 182 $ (145) $ 37 Amortization associated with other intangible assets was as follows: Three Months Ended Six Months Ended June 30, 2022 (in millions) Southern Company (a) $ 9 $ 19 Southern Power (b) 5 10 Southern Company Gas 2 5 (a) Includes $5 million and $10 million for the three and six months ended June 30, 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 Southern Southern June 30, 2022 December 31, 2021 June 30, 2022 December 31, 2021 June 30, 2022 December 31, 2021 (in millions) Cash and cash equivalents $ 1,724 $ 1,798 $ 202 $ 107 $ 217 $ 45 Restricted cash (a) : Other current assets 2 2 — — 2 2 Other deferred charges and assets 9 29 9 29 — — Total cash, cash equivalents, and restricted cash (b) $ 1,735 $ 1,829 $ 211 $ 135 $ 218 $ 48 (a) For Southern Power, reflects $9 million and $10 million at June 30, 2022 and December 31, 2021, respectively, held to fund estimated construction completion costs at the Deuel Harvest wind facility and $19 million at December 31, 2021 related to tax equity contributions restricted until the Garland battery energy storage facility achieved final contracted capacity. 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, 2022 is expected to be restored prior to year end. Depreciation and Amortization See Note 5 to the financial statements under "Depreciation and Amortization – Southern Power" in Item 8 of the Form 10-K for additional information. Effective January 1, 2022, Southern Power revised the depreciable lives of its wind generating facilities from up to 30 years to up to 35 years. This revision resulted in an immaterial decrease in depreciation for the three and six months ended June 30, 2022 and is expected to result in an immaterial decrease in annual depreciation for 2022.

Regulatory Matters

Regulatory Matters	6 Months Ended
Regulatory Matters	Jun. 30, 2022
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, 2022 and December 31, 2021 were as follows: Regulatory Clause Balance Sheet Line Item June 30, December 31, 2021 (in millions) Alabama Power Rate CNP Compliance Other regulatory assets, deferred $ 29 $ 16 Rate CNP PPA Other regulatory assets, deferred 93 84 Retail Energy Cost Recovery () Other regulatory assets, current 60 — Other regulatory assets, deferred 191 126 Georgia Power Fuel Cost Recovery Deferred under recovered fuel clause revenues $ 948 $ 410 Mississippi Power Fuel Cost Recovery Other customer accounts receivable $ 29 $ 4 Ad Valorem Tax Other regulatory assets, current 12 12 Other regulatory assets, deferred 29 37 Southern Company Gas Natural Gas Cost Recovery Natural gas cost under recovery $ 361 $ 266 Other regulatory assets, deferred 15 207 () In accordance with an Alabama PSC order issued on February 1, 2022, Alabama Power applied $126 million of its 2021 Rate RSE refund to reduce the Rate ECR under recovered balance. Alabama Power Certificate of Convenience and Necessity On July 12, 2022, the Alabama PSC approved and, on July 15, 2022, issued its order regarding Alabama Power's petition for a certificate of convenience and necessity (CCN) which authorizes Alabama Power to complete the acquisition of the Calhoun Generating Station, which was approved by the FERC on March 25, 2022, and is expected to close by September 30, 2022. Alabama Power expects to recover all approved costs associated with the acquisition through existing rate mechanisms as outlined in Note 2 to the financial statements in Item 8 of the Form 10-K. The Alabama PSC's order is subject to any rehearing request or judicial appeal filed on or before August 15, 2022. The ultimate outcome of this matter cannot be determined at this time. Rate ECR On July 12, 2022, the Alabama PSC approved an adjustment to Rate ECR from 1.960 cents per KWH to 2.557 cents per KWH, or approximately $310 million annually, effective with August 2022 billings. The approved increase in the Rate ECR factor will have no significant effect on Alabama Power's net income, but will increase operating cash flows related to fuel cost recovery. The rate will adjust to 5.910 cents per KWH in January 2025 absent a further order from the Alabama PSC. Rate NDR On July 12, 2022, the Alabama PSC approved modifications to Rate NDR, which include an adjustment to the charges to establish and maintain the reserve and an adjustment to the recovery period for any existing deferred storm-related operations and maintenance costs and future reserve deficits from 24 months to 48 months. As modified, the maximum total Rate NDR charge to recover a deficit is limited to $5.00 per month per non-residential customer account and $2.50 per month per residential customer account. At June 30, 2022, Alabama Power's NDR balance was $103 million. Beginning with August 2022 billings, the reserve establishment charge will be suspended and the reserve maintenance charge will be activated as a result of the NDR balance exceeding $75 million. Alabama Power expects to collect $6 million in the second half of 2022 and approximately $12 million annually beginning in 2023 under Rate NDR unless the NDR balance falls below $50 million. Alabama Power continues to have the authority to accrue additional amounts to the NDR as circumstances warrant. Reliability Reserve Accounting Order On July 12, 2022, the Alabama PSC approved an accounting order authorizing Alabama Power to create a reliability reserve separate from the NDR and transition the previous Rate NDR authority related to reliability expenditures to the reliability reserve. Alabama Power may make accruals to the reliability reserve if the NDR balance exceeds $35 million. Renewable Generation Certificate Through the issuance of a Renewable Generation Certificate (RGC), Alabama Power is authorized by the Alabama PSC to procure up to 500 MWs of renewable capacity and energy by September 16, 2027 and to market the related energy and environmental attributes to customers and other third parties. In April 2022, one of the existing solar projects which was expected to be served through a PPA commencing in first quarter 2024 was terminated, resulting in the restoration of 80 MWs of capacity under the RGC. The ultimate outcome of this matter cannot be determined at this time. Georgia Power Rate Plans 2022 Base Rate Case On June 24, 2022, Georgia Power filed a base rate case (Georgia Power 2022 Base Rate Case) with the Georgia PSC. The filing proposes continuation of a three-year alternate rate plan with requested rate increases totaling $852 million, $107 million, and $45 million effective January 1, 2023, January 1, 2024, and January 1, 2025, respectively. These increases are based on a proposed retail ROE of 11.00% using the currently approved equity ratio of 56% and reflect levelized revenue requirements during the three-year period, with the exception of incremental compliance costs related to CCR AROs, Demand-Side Management (DSM) programs, and related adjustments to the Municipal Franchise Fee tariff. Georgia Power has requested recovery of the proposed increases through its existing base rate tariffs as follows: Tariff 2023 2024 2025 (in millions) Traditional base $ 739 $ — $ — ECCR Traditional (1) — — CCR ARO (a) 64 78 47 DSM (a) 30 27 (2) Municipal Franchise Fee 20 2 1 Total (b) $ 852 $ 107 $ 45 (a) As determined by the Georgia PSC through annual compliance filings. (b) Totals may not add due to rounding. Georgia Power's filing primarily reflects requests to (i) recover the costs of recent and future capital investments in the electric grid including the transmission and distribution systems and the continuation of its grid investment plan, all designed to support customer long-term reliability and resiliency needs, (ii) recover the cost of coal-fired generation units proposed for retirement, or made unavailable, as requested in the 2022 IRP, as Georgia Power continues the transition of the generation fleet to more economical and cleaner resources, (iii) make the necessary investments and recover costs to comply with federal and state environmental regulations, including costs associated with the CCR AROs related to ash pond and landfill closures and post-closure care, and (iv) reduce operating costs despite significant inflationary pressures. In addition, the filing includes the following provisions: • Continuation of an allowed retail ROE range of 9.50% to 12.00%. • Continuation of the process whereby 80% of any earnings above the top of the allowed ROE range are shared with Georgia Power's customers and the remaining 20% are retained by Georgia Power. • Continuation of the option to file an Interim Cost Recovery tariff in the event earnings are projected to fall below the bottom of the allowed ROE range during the three-year term of the plan. Georgia Power expects the Georgia PSC to render a final decision in this matter on December 20, 2022. The ultimate outcome of this matter cannot be determined at this time. 2019 ARP In 2020, the Georgia PSC denied a motion for reconsideration filed by Sierra Club regarding the Georgia PSC's decision in the 2019 ARP allowing Georgia Power to recover compliance costs for CCR AROs. The Superior Court of Fulton County subsequently affirmed the Georgia PSC's decision and, in October 2021, the Georgia Court of Appeals affirmed the Superior Court of Fulton County's order. In December 2021, Sierra Club filed a petition for writ of certiorari to the Georgia Supreme Court, which was denied on July 14, 2022. This matter is now concluded. See Note 6 to the financial statements in Item 8 of the Form 10-K for additional information regarding Georgia Power's AROs. Integrated Resource Plans In response to supply chain challenges in the solar industry, the Georgia PSC approved Georgia Power's request to amend 970 MWs of utility-scale solar PPAs that were authorized by the Georgia PSC in Georgia Power's 2019 IRP. The amendments extended the required commercial operation dates for the PPAs from 2023 to 2024. On July 21, 2022, the Georgia PSC approved the 2022 IRP, as modified by a stipulated agreement among Georgia Power, the staff of the Georgia PSC, and certain intervenors and as further modified by the Georgia PSC. In the 2022 IRP decision, the Georgia PSC approved the following requests: • Decertification and retirement of Plant Wansley Units 1 and 2 (926 MWs based on 53.5% ownership) by August 31, 2022 and reclassification to regulatory asset accounts of the remaining net book values ($302 million and $279 million for Unit 1 and Unit 2, respectively, at June 30, 2022) and any remaining unusable materials and supplies inventories upon retirement. The regulatory asset accounts for the net book values of the units will be amortized at a rate equal to the unit depreciation rates authorized in the 2019 ARP through December 31, 2022. In the Georgia Power 2022 Base Rate Case, Georgia Power requested recovery of the remaining regulatory asset balances for the net book values of the units through 2030 and requested that the timing of recovery of the regulatory asset account for the unusable materials and supplies inventories be determined in a future base rate case. • Decertification and retirement of Plant Scherer Unit 3 (614 MWs based on 75% ownership) by December 31, 2028 and reclassification to regulatory asset accounts of the remaining net book value (approximately $614 million at June 30, 2022) and any remaining unusable materials and supplies inventory to regulatory asset accounts upon retirement. The timing of recovery for these regulatory assets is expected to be determined in a future base rate case. • Decertification and retirement of Plant Gaston Units 1 through 4 (500 MWs based on 50% ownership through SEGCO) by December 31, 2028. See Note 7 to the financial statements under "SEGCO" in Item 8 of the Form 10-K for additional information. • Georgia Power's environmental compliance strategy, including approval of Georgia Power's plans to address CCR at its ash ponds and landfills. Recovery of the related costs is expected to be determined in future base rate cases. The Georgia PSC's approval included a change in the method of closure for one ash pond. Georgia Power is currently evaluating the related impact on its cost estimates and AROs; however, it is not expected to be material. • Installation of environmental controls at Plants Bowen and Scherer for compliance with rules related to effluent limitations guidelines. • Initiation of a license renewal application with the NRC for Plant Hatch. • Investments related to the continued hydro operations of Plants Sinclair and Burton. • Provisional authorization for development of a 265-MW battery energy storage facility with expected commercial operation in 2026. • Issuance of requests for proposals (RFP) for 2,300 MWs of renewable resources, an additional 500 MWs of energy storage, and up to 140 MWs of biomass generation. • Related transmission projects necessary to support the generation facilities plan. • Certification of six PPAs (including five affiliate PPAs with Southern Power that are subject to approval by the FERC) with capacities of 1,567 MWs beginning in 2024, 380 MWs beginning in 2025, and 228 MWs beginning in 2028, procured through RFPs authorized in the 2019 IRP. See Note (F) under "Georgia Power Lease Modification" for additional information. The Georgia PSC deferred a decision on the requested decertification and retirement of Plant Bowen Units 1 and 2 (1,400 MWs) to the 2025 IRP and rejected Georgia Power's request to certify approximately 88 MWs of wholesale capacity to be placed in retail rate base between January 1, 2024 and January 1, 2025. Georgia Power may offer such capacity in the wholesale market or to the retail jurisdiction in a future regulatory proceeding. The ultimate outcome of these matters cannot be determined at this time. Nuclear Construction In 2009, the Georgia PSC certified construction of Plant Vogtle Units 3 and 4, in which Georgia Power 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 the end of the first quarter 2023 and the fourth quarter 2023, respectively, is as follows: (in millions) Base project capital cost forecast (a)(b) $ 10,393 Construction contingency estimate 60 Total project capital cost forecast (a)(b) 10,453 Net investment at June 30, 2022 (b) (8,966) Remaining estimate to complete $ 1,487 (a) Includes approximately $590 million of costs that are not shared with the other Vogtle Owners and approximately $455 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 $385 million, of which $247 million had been accrued through June 30, 2022. (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 $3.4 billion, of which $3.0 billion had been incurred through June 30, 2022. As part of its ongoing processes, Southern Nuclear continues to evaluate cost and schedule forecasts on a regular basis to incorporate current information available, particularly in the areas of engineering support, commodity installation, system turnovers and related test results, and workforce statistics. Southern Nuclear establishes aggressive target values for monthly construction production and system turnover activities, which are reflected in the site work plans. 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 Fuel load for Unit 3 is projected during the fourth quarter 2022 with an in-service date projected during the first quarter 2023. Unit 3's projected schedule primarily depends on the volume and completion of construction remediation work, completion of work packages, including inspection records, and other documentation necessary to submit the remaining ITAACs and begin fuel load, the pace of system and area turnovers, and the progression of startup and other testing. An in-service date during the fourth quarter 2023 for Unit 4 is projected. Unit 4's projected schedule primarily depends on Unit 3 progress through fuel load, startup, and testing; overall construction productivity and production levels improving, particularly in electrical installation, including terminations; and appropriate levels of craft laborers, particularly electricians and pipefitters, being added and maintained. Any further delays could result in later in-service dates and cost increases. During the first half of 2022, established construction contingency totaling $126 million was assigned to the base capital cost forecast for costs primarily associated with construction productivity, the pace of system turnovers, additional craft and support resources, and procurement for Units 3 and 4. Georgia Power also increased its total project capital cost forecast as of June 30, 2022 by adding $36 million to replenish construction contingency. After considering the significant level of uncertainty that exists regarding the future recoverability of these costs since the ultimate outcome of these matters is subject to the outcome of future assessments by management, as well as Georgia PSC decisions in future regulatory proceedings, Georgia Power recorded a pre-tax charge to income in the second quarter 2022 of $36 million ($27 million after tax) for the increase in the total project capital cost forecast. Georgia Power may request the Georgia PSC to evaluate those expenditures for rate recovery during the prudence review following the Unit 4 fuel load pursuant to the twenty-fourth VCM stipulation described below. As Unit 3 completes system turnover from construction and moves to testing and transition to operations, ongoing and potential future challenges include construction productivity, completion of construction remediation work, completion of work packages, including inspection records, and other documentation necessary to submit the remaining ITAACs and begin fuel load, and final component and pre-operational tests. As Unit 4 progresses through construction and continues to transition into testing, ongoing and potential future challenges include the pace and quality of electrical installation; availability of craft and supervisory resources, including the temporary diversion of such resources to support Unit 3 construction efforts; the pace of work package closures and system turnovers; and the timeframe and duration of hot functional and other testing. As construction, including subcontract work, continues on both Units 3 and 4, ongoing or future challenges include management of contractors and vendors; subcontractor performance; supervision of craft labor and related productivity, particularly in the installation of electrical, mechanical, and instrumentation and controls commodities, ability to attract and retain craft labor, and/or related cost escalation; and procurement and related installation. New challenges may arise, particularly as Units 3 and 4 move into initial 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). The ongoing and potential future challenges described above may change the projected schedule and estimated cost. 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. Additional license amendment requests also may be filed with the NRC. 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. In connection with the additional construction remediation work described above, Southern Nuclear reviewed the project's construction quality programs and, where needed, is implementing improvement plans consistent with these processes. On March 25, 2022, the NRC completed its follow-up inspection related to the November 2021 final significance report on its special inspection to review the root cause of this additional construction remediation work and the corresponding corrective action plans. The NRC closed the two white findings identified in November 2021 and returned Vogtle Unit 3 to the NRC's baseline inspection program. Various design and other licensing-based compliance matters, including the timely submittal by Southern Nuclear of the ITAAC documentation for each unit and the related reviews and approvals by the NRC necessary to support NRC authorization to load fuel, have arisen or may arise, which may result in additional license amendments or require other resolution. If any license amendment requests or other licensing-based compliance issues, including inspections and ITAACs, are not resolved in a timely manner, there may be delays in the 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 the first quarter 2023 for Unit 3 or the fourth quarter 2023 for Unit 4, including the current level of cost sharing described below, is estimated to result in additional base capital costs for Georgia Power of up to $35 million per month for Unit 3 and $45 million per month for Unit 4, 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 which formed the basis of Georgia Power's forecast of $8.4 billion in the nineteenth VCM 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 EAC in the nineteenth VCM (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 EAC in the nineteenth VCM (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. If the EAC is revised and exceeds the EAC in the nineteenth VCM 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 EAC in the nineteenth VCM 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 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. Effective February 25, 2022, all of the Vogtle Owners had 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. Based on the definition in the Global Amendments, Georgia Power believes the starting dollar amount is $18.38 billion and the current project capital cost forecast exceeds the cost-sharing provision threshold, but not the tender provision threshold. The other Vogtle Owners have notified Georgia Power that they believe the current project capital cost forecast exceeds the cost-sharing thresholds and triggers the tender provisions under the Global Amendments. Georgia Power recorded pre-tax charges to income in the fourth quarter 2021 and the second quarter 2022 of approximately $440 million ($328 million after tax) and $16 million ($12 million after tax), respectively, associated with these cost-sharing and tender provisions, which are included in the total project capital cost forecast. Georgia Power may be required to record further pre-tax charges to income of up to approximately $480 million associated with these provisions based on the current project capital cost forecast. Georgia Power's incremental charges associated with these provisions, which relate to the other Vogtle Owners' share of costs, will not be recovered from retail customers. In October 2021, Georgia Power and the other Vogtle Owners entered into an agreement, which was modified on June 3, 2022, to clarify the process for the tender provisions of the Global Amendments to provide for a decision between 120 and 194 days after the tender option is triggered, which the other Vogtle Owners assert occurred on February 14, 2022, and would require the other Vogtle Owners to notify Georgia Power of their intent to exercise their tender options by August 27, 2022. On June 17, 2022 and July 26, 2022, OPC and Dalton, respectively, notified Georgia Power of their purported exercises of their tender options. On June 18, 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 have 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

Contingencies

Contingencies	6 Months Ended
Contingencies	Jun. 30, 2022
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. Southern Company In February 2017, Jean Vineyard and Judy Mesirov each filed a shareholder derivative lawsuit in the U.S. District Court for the Northern District of Georgia. Each of these lawsuits named as defendants Southern Company, certain of its directors, certain of its current and former officers, and certain former Mississippi Power officers. In 2017, these two shareholder derivative lawsuits were consolidated in the U.S. District Court for the Northern District of Georgia. The complaints alleged that the defendants caused Southern Company to make false or misleading statements regarding the Kemper County energy facility cost and schedule. Further, the complaints alleged that the defendants were unjustly enriched and caused the waste of corporate assets and also alleged that the individual defendants violated their fiduciary duties. In May 2017, Helen E. Piper Survivor's Trust filed a shareholder derivative lawsuit in the Superior Court of Gwinnett County, Georgia that named as defendants Southern Company, certain of its directors, certain of its current and former officers, and certain former Mississippi Power officers. The complaint alleged that the individual defendants, among other things, breached their fiduciary duties in connection with schedule delays and cost overruns associated with the construction of the Kemper County energy facility. The complaint further alleged that the individual defendants authorized or failed to correct false and misleading statements regarding the Kemper County energy facility schedule and cost and failed to implement necessary internal controls to prevent harm to Southern Company. In August 2019, the court granted a motion filed by the plaintiff in July 2019 to substitute a new named plaintiff, Martin J. Kobuck, in place of Helen E. Piper Survivor's Trust. The plaintiffs in each of these cases sought to recover, on behalf of Southern Company, unspecified actual damages and, on each plaintiff's own behalf, attorneys' fees and costs in bringing the lawsuit. The plaintiffs also sought certain changes to Southern Company's corporate governance and internal processes. On January 21, 2022, the plaintiffs in the federal court action filed a motion for preliminary approval of settlement, together with an executed stipulation of settlement, which applied to both actions. On June 9, 2022, the U.S. District Court for the Northern District of Georgia granted final approval of the settlement and, on June 16, 2022, the Superior Court of Gwinnett County, Georgia entered an order awarding attorneys' fees and expenses related to the Martin J. Kobuck lawsuit. The settlement consists of an aggregate payment by Southern Company's insurers of approximately $4.5 million for attorneys' fees and expenses, as well as adoption of various corporate governance reforms by Southern Company. These matters are now concluded. Georgia Power 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. The amount of any possible losses cannot be estimated at this time because, among other factors, it is unknown whether any losses would be subject to recovery from any municipalities. In July 2020, a group of individual plaintiffs filed a complaint in the Superior Court of Fulton County, Georgia against Georgia Power alleging that releases from Plant Scherer have impacted groundwater, surface water, 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. Georgia Power has filed multiple motions to dismiss the complaint. In October 2021, three 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 seek an unspecified amount of monetary damages including punitive damages. In November 2021, Georgia Power filed a notice to remove the three cases pending in the Superior Court of Monroe County, Georgia to the U.S. District Court for the Middle District of Georgia. On February 7, 2022, four additional complaints were filed in the Superior Court of Monroe County, Georgia against Georgia Power seeking damages for alleged personal injuries or property damage. On March 9, 2022, Georgia Power filed a notice to remove the four cases pending in the Superior Court of Monroe County, Georgia to the U.S. District Court for the Middle District of 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. On March 21, 2022, the 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 $16 million and $17 million at June 30, 2022 and December 31, 2021, 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 $241 million and $249 million at June 30, 2022 and December 31, 2021, respectively, based on the estimated cost of environmental investigation and remediation associated with known former manufactured gas plant operating sites. The ultimate outcome of these matters cannot be determined at this time; however, as a result of the regulatory treatment for environmental remediation expenses described above, the final disposition of these matters is not expected to have a material impact on the financial statements of the applicable Registrants. Other Matters Mississippi Power In conjunction with Southern Company's 2019 sale of Gulf Power, NextEra Energy, Inc. held back $75 million of the purchase price pending Mississippi Power and Gulf Power negotiating a mutually acceptable revised operating agreement for Plant Daniel. On July 12, 2022, the co-owners executed a revised operating agreement and Southern Company subsequently received the remaining $75 million of the purchase price. The revised operating agreement contains dispatch procedures for the two jointly-owned coal units at Plant Daniel such that Mississippi Power will designate one of the two units as primary and the other as secondary in lieu of each company separately owning 100% of a single generating unit. Mississippi Power has the option to purchase its co-owner's ownership interest for $1 on January 15, 2024, provided that Mississippi Power exercises the option no later than 120 days prior to that date. The revised operating agreement is not expected to have a material impact on Mississippi Power's financial statements. See Note 15 to the financial statements under "Southern Company" in Item 8 of the Form 10-K for additional information regarding the sale of Gulf 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, 2022
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, 2022 and 2021: 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 (a) 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 (a) 1,368 392 654 23 292 35 Total operating revenues $ 13,854 $ 3,580 $ 5,328 $ 769 $ 1,438 $ 3,140 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2021 Operating revenues Retail electric revenues Residential $ 1,469 $ 553 $ 852 $ 64 $ — $ — Commercial 1,176 386 724 66 — — Industrial 728 334 321 73 — — Other 23 4 17 2 — — Total retail electric revenues 3,396 1,277 1,914 205 — — Natural gas distribution revenues Residential 311 — — — — 311 Commercial 73 — — — — 73 Transportation 247 — — — — 247 Industrial 8 — — — — 8 Other 59 — — — — 59 Total natural gas distribution revenues 698 — — — — 698 Wholesale electric revenues PPA energy revenues 209 38 16 2 158 — PPA capacity revenues 118 29 14 1 75 — Non-PPA revenues 55 25 3 75 78 — Total wholesale electric revenues 382 92 33 78 311 — Other natural gas revenues Wholesale gas services 578 — — — — 578 Gas marketing services 63 — — — — 63 Other natural gas revenues 10 — — — — 10 Total natural gas revenues 651 — — — — 651 Other revenues 295 52 137 7 5 — Total revenue from contracts with customers 5,422 1,421 2,084 290 316 1,349 Other revenue sources (a) 1,179 135 141 13 174 731 Other adjustments (b) (1,403) — — — — (1,403) Total operating revenues $ 5,198 $ 1,556 $ 2,225 $ 303 $ 490 $ 677 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Six Months Ended June 30, 2021 Operating revenues Retail electric revenues Residential $ 2,936 $ 1,181 $ 1,627 $ 128 $ — $ — Commercial 2,294 758 1,410 126 — — Industrial 1,397 654 606 137 — — Other 47 9 34 4 — — Total retail electric revenues 6,674 2,602 3,677 395 — — Natural gas distribution revenues Residential 925 — — — — 925 Commercial 243 — — — — 243 Transportation 536 — — — — 536 Industrial 24 — — — — 24 Other 155 — — — — 155 Total natural gas distribution revenues 1,883 — — — — 1,883 Wholesale electric revenues PPA energy revenues 422 81 30 7 313 — PPA capacity revenues 237 58 27 4 150 — Non-PPA revenues 119 57 12 162 139 — Total wholesale electric revenues 778 196 69 173 602 — Other natural gas revenues Wholesale gas services 2,168 — — — — 2,168 Gas marketing services 257 — — — — 257 Other natural gas revenues 17 — — — — 17 Total natural gas revenues 2,442 — — — — 2,442 Other revenues 542 97 249 14 9 — Total revenue from contracts with customers 12,319 2,895 3,995 582 611 4,325 Other revenue sources (a) 2,488 220 200 28 319 1,745 Other adjustments (b) (3,699) — — — — (3,699) Total operating revenues $ 11,108 $ 3,115 $ 4,195 $ 610 $ 930 $ 2,371 (a) 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. (b) Other adjustments relate to the cost of Southern Company Gas' energy and risk management activities. Wholesale gas services revenues are presented net of the related costs of those activities on the statement of income. See Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K and Note (L) under "Southern Company Gas" for information on the sale of Sequent and components of wholesale gas services' operating revenues, respectively. 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, 2022 and December 31, 2021: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Accounts Receivable At June 30, 2022 $ 3,021 $ 773 $ 1,217 $ 95 $ 278 $ 504 At December 31, 2021 2,504 589 736 73 149 753 Contract Assets At June 30, 2022 $ 102 $ — $ 38 $ — $ — $ — At December 31, 2021 117 2 63 — 1 — Contract Liabilities At June 30, 2022 $ 70 $ 3 $ 25 $ 4 $ 1 $ — At December 31, 2021 57 4 14 — 1 — At June 30, 2022 and December 31, 2021, Georgia Power had contract assets primarily related 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 relate to cash collections recognized in advance of revenue for unregulated service agreements. Southern Company's unregulated distributed generation business had $63 million and $50 million of contract assets and $38 million and $39 million of contract liabilities at June 30, 2022 and December 31, 2021, respectively, for outstanding performance obligations. Revenues recognized in the three and six months ended June 30, 2022, which were included in contract liabilities at December 31, 2021, were $10 million and $19 million, respectively, for Southern Company and immaterial for the other Registrants. Remaining Performance Obligations The Subsidiary Registrants have long-term contracts with customers in which revenues are recognized as performance obligations are satisfied over the contract term. For the traditional electric operating companies 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 involve energy infrastructure enhancement and upgrade projects for certain governmental customers. 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, 2022 are expected to be recognized as follows: 2022 (remaining) 2023 2024 2025 2026 Thereafter (in millions) Southern Company $ 347 $ 617 $ 414 $ 322 $ 307 $ 2,340 Alabama Power 15 24 7 5 — — Georgia Power 39 63 30 22 11 21 Southern Power 184 347 344 294 299 2,334 Southern Company Gas 16 29 29 — — — Revenue expected to be recognized for performance obligations remaining at June 30, 2022 w as immaterial for Mississippi Power. Lease Income Lease income for the three and six months ended June 30, 2022 and 2021 is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) 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 For the Three Months Ended June 30, 2021 Lease income - interest income on sales-type leases $ 4 $ — $ — $ 4 $ — $ — Lease income - operating leases 56 21 10 — 21 9 Variable lease income 128 (1) — — 138 — Total lease income $ 188 $ 20 $ 10 $ 4 $ 159 $ 9 For the Six Months Ended June 30, 2021 Lease income - interest income on sales-type leases $ 7 $ — $ — $ 7 $ — $ — Lease income - operating leases 112 41 21 1 42 17 Variable lease income 212 — — — 228 — Total lease income $ 331 $ 41 $ 21 $ 8 $ 270 $ 17 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, 2022
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 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, 2022 and December 31, 2021, SP Solar had total assets of $6.0 billion and $6.1 billion, respectively, total liabilities of $386 million and $408 million, respectively, and noncontrolling interests of $1.1 billion. 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, 2022 and December 31, 2021, SP Wind had total assets of $2.3 billion, total liabilities of $212 million and $130 million, respectively, and noncontrolling interests of $40 million and $41 million, respectively. 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, 2022 and December 31, 2021, the other VIEs had total assets of $1.8 billion and $1.9 billion, respectively, total liabilities of $253 million and $263 million, respectively, and noncontrolling interests of $858 million and $886 million, respectively. 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 June 30, 2022 and December 31, 2021, Southern Power had equity method investments in wind and battery energy storage projects totaling $49 million and $86 million, respectively. Earnings (loss) from these investments were immaterial for both periods presented. During the six months ended June 30, 2022, Southern Power sold equity method investments in wind projects and received proceeds totaling $38 million. The gains associated with the sales were immaterial. Southern Company Gas Equity Method Investments The carrying amounts of Southern Company Gas' equity method investments at June 30, 2022 and December 31, 2021 and related earnings (loss) from those investments for the three and six months ended June 30, 2022 and 2021 were as follows: Investment Balance June 30, 2022 December 31, 2021 (in millions) SNG $ 1,099 $ 1,129 Other () 35 44 Total $ 1,134 $ 1,173 () Balance at June 30, 2022 reflects a $9 million distribution from PennEast Pipeline. Three Months Ended June 30, Six Months Ended June 30, Earnings (Loss) from Equity Method Investments 2022 2021 2022 2021 (in millions) SNG $ 31 $ 28 $ 70 $ 66 PennEast Pipeline () — (81) — (79) Other — 1 1 2 Total $ 31 $ (52) $ 71 $ (11) () Includes a pre-tax impairment charge of $82 million ($58 million after tax) for the three and six months ended June 30, 2021. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.

Financing and Leases

Financing and Leases	6 Months Ended
Financing and Leases	Jun. 30, 2022
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, 2022, committed credit arrangements with banks were as follows: Expires Company 2023 2024 2025 2026 Total Unused Expires within (in millions) Southern Company parent $ — $ — $ — $ 2,000 $ 2,000 $ 1,998 $ — Alabama Power — 550 — 700 1,250 1,250 — Georgia Power — — — 1,750 1,750 1,726 — Mississippi Power — 150 125 — 275 275 — Southern Power (a) — — — 600 600 568 — Southern Company Gas (b) 250 — — 1,500 1,750 1,748 250 SEGCO 30 — — — 30 30 30 Southern Company $ 280 $ 700 $ 125 $ 6,550 $ 7,655 $ 7,595 $ 280 (a) Does not include Southern Power Company's two $75 million continuing letter of credit facilities for standby letters of credit, expiring in 2023 and 2025, respectively, of which $11 million and $5 million, respectively, was unused at June 30, 2022. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities. (b) 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 2026. Southern Company Gas' committed credit arrangement expiring in 2026 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 2026, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower of a new $250 million credit arrangement expiring in 2023. As reflected in the table above, in March 2022, Mississippi Power amended and restated its $125 million revolving credit arrangement, which among other things, extended the maturity date from 2023 to 2025 and allows for borrowing based on term SOFR. 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 or, in the case of Southern Power, cross-default provisions to other indebtedness (including guarantee obligations) that are restricted only to the indebtedness of the individual company. Such cross-default provisions to other indebtedness would trigger an event of default if Southern Power defaulted on indebtedness or guarantee obligations over a specified threshold. Such 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, 2022, 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, 2022 was approximately $1.5 billion (comprised of approximately $789 million at Alabama Power, $672 million at Georgia Power, and $34 million at Mississippi Power). In addition, at June 30, 2022, Georgia Power had approximately $445 million of fixed rate revenue bonds outstanding that are required to be remarketed within the next 12 months. Equity Units In May 2022, Southern Company remarketed $862.5 million aggregate principal amount of its Series 2019A Remarketable Junior Subordinated Notes due August 1, 2024 (2019A RSNs) and $862.5 million aggregate principal amount of its Series 2019B Remarketable Junior Subordinated Notes due August 1, 2027 (2019B RSNs), pursuant to the terms of its 2019 Series A Equity Units (Equity Units). In connection with the remarketing, the interest rates on the 2019A RSNs and the 2019B RSNs were reset to 4.475% and 5.113%, respectively, payable on a semi-annual basis, and Southern Company ceased to have the ability to redeem these securities prior to maturity or to defer interest payments. Southern Company did not receive any proceeds from the remarketing, which were used to purchase a portfolio of treasury securities maturing on July 28, 2022. On August 1, 2022, the proceeds from this maturing portfolio will be used to settle the purchase contracts entered into as a part of the Equity Units and Southern Company expects to issue approximately 25.2 million shares of common stock. At June 30, 2022 and December 31, 2021, the 2019A RSNs and the 2019B RSNs are included in long-term debt on Southern Company's consolidated balance sheets. Earnings per Share For Southern Company, the only differences in computing basic and diluted earnings per share are attributable to awards outstanding under stock-based compensation plans and the Equity Units issued in 2019. Earnings per share dilution resulting from stock-based compensation plans and the Equity Units issuance is determined using the treasury stock method. See Note 8 to the financial statements under "Equity Units" in Item 8 of the Form 10-K and "Equity Units" herein for information on the equity units and Note 12 to the financial statements in Item 8 of the Form 10-K for information on stock-based compensation plans. Shares used to compute diluted earnings per share were as follows: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in millions) As reported shares 1,065 1,061 1,064 1,060 Effect of stock-based compensation 5 6 5 6 Effect of equity units 2 — 1 — Diluted shares 1,072 1,067 1,070 1,066 For all periods presented, an immaterial number of stock-based compensation awards was not included in the diluted earnings per share calculation because the awards were anti-dilutive. 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. On June 30, 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. The parties to the lease agreement are currently negotiating a potential restructuring, which could result in rescission of the termination notice. The ultimate outcome of this matter cannot be determined at this time but is not expected to have a material impact on Southern Company's financial statements. Georgia Power Lease Modification See Note 9 to the financial statements in Item 8 of the Form 10-K for information on Georgia Power's leases. Subsequent to June 30, 2022, Georgia Power recognized a lease modification related to an existing non-affiliate PPA which converted from an operating lease to a finance lease upon its approval in the 2022 IRP. As a result, Georgia Power will remove operating lease right-of-use assets, net of amortization of $17 million and lease obligations of $18 million maturing through 2024 and will record finance lease right-of-use assets of $110 million and lease obligations of $111 million maturing through 2039.

Income Taxes

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2022
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 had federal ITC and PTC carryforwards (primarily related to Southern Power) totaling $0.9 billion at June 30, 2022 compared to $1.2 billion at December 31, 2021. The federal PTC and ITC carryforwards begin expiring in 2032, but are expected to be fully utilized by 2025. 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, the purchase of rights to additional PTCs of Plant Vogtle Units 3 and 4 pursuant to certain joint ownership agreements, an increase in Georgia Power's ownership interest percentage 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 18.7% for the six months ended June 30, 2022 compared to 10.7% for the corresponding period in 2021. The effective tax rate increase was primarily due to higher pre-tax earnings and an adjustment related to a prior year state tax credit carryforward at Georgia Power in 2022. Georgia Power Georgia Power's effective tax rate was 16.4% for the six months ended June 30, 2022 compared to a tax benefit rate of (6.9)% for the corresponding period in 2021. The effective tax rate increase was primarily due to higher pre-tax earnings and an adjustment related to a prior year state tax credit carryforward in 2022. Mississippi Power Mississippi Power's effective tax rate was 18.8% for the six months ended June 30, 2022 compared to 12.6% for the corresponding period in 2021. The effective tax rate increase was primarily due to a decrease in the flowback of excess deferred income taxes in 2022. Southern Power Southern Power's effective tax rate was 11.2% for the six months ended June 30, 2022 compared to a tax benefit rate of (12.8)% for the corresponding period in 2021. The effective tax rate increase was primarily due to higher pre-tax earnings in 2022 and a change in state apportionment methodology resulting from tax legislation enacted by the State of Alabama in the first quarter 2021, partially offset by higher wind PTCs in 2022.

Retirement Benefits

Retirement Benefits	6 Months Ended
Retirement Benefits	Jun. 30, 2022
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, 2022. 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. During the first quarter 2022, the qualified pension plan achieved the predetermined funding threshold whereby the asset allocation was adjusted to invest a larger portion of the portfolio in fixed rate debt securities. 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, 2022 and 2021 are presented in the following tables. 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 cost (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 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2021 Pension Plans Service cost $ 108 $ 25 $ 28 $ 5 $ 3 $ 9 Interest cost 86 21 26 4 1 6 Expected return on plan assets (297) (71) (94) (13) (4) (22) Amortization: Prior service costs — — 1 — — — Regulatory asset — — — — — 4 Net loss 79 20 25 3 1 3 Net periodic pension cost (income) $ (24) $ (5) $ (14) $ (1) $ 1 $ — Postretirement Benefits Service cost $ 6 $ 2 $ 1 $ — $ — $ 1 Interest cost 9 2 3 1 — 1 Expected return on plan assets (19) (7) (6) (1) — (2) Amortization: Prior service costs (1) — — — — — Regulatory asset — — — — — 1 Net loss 1 — — — — — Net periodic postretirement benefit cost (income) $ (4) $ (3) $ (2) $ — $ — $ 1 Six Months Ended June 30, 2021 Pension Plans Service cost $ 217 $ 51 $ 56 $ 9 $ 5 $ 18 Interest cost 173 41 52 8 2 12 Expected return on plan assets (595) (143) (188) (27) (7) (43) Amortization: Prior service costs — — 1 — — (1) Regulatory asset — — — — — 8 Net loss 157 41 50 7 2 6 Net periodic pension cost (income) $ (48) $ (10) $ (29) $ (3) $ 2 $ — Postretirement Benefits Service cost $ 12 $ 3 $ 3 $ — $ — $ 1 Interest cost 17 4 6 1 — 2 Expected return on plan assets (38) (14) (13) (1) — (4) Amortization: Prior service costs (1) — — — — — Regulatory asset — — — — — 3 Net (gain)/loss 2 — 1 — — (1) Net periodic postretirement benefit cost (income) $ (8) $ (7) $ (3) $ — $ — $ 1

Fair Value Measurements

Fair Value Measurements	6 Months Ended
Fair Value Measurements	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS At June 30, 2022, 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, 2022 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 43 $ 408 $ — $ — $ 451 Investments in trusts: (b)(c) Domestic equity 643 168 — — 811 Foreign equity 122 144 — — 266 U.S. Treasury and government agency securities — 273 — — 273 Municipal bonds — 56 — — 56 Pooled funds – fixed income — 9 — — 9 Corporate bonds 1 445 — — 446 Mortgage and asset backed securities — 89 — — 89 Private equity — — — 164 164 Cash and cash equivalents 3 — — — 3 Other 36 17 — — 53 Cash equivalents 1,058 10 — — 1,068 Other investments 9 27 — — 36 Total $ 1,915 $ 1,646 $ — $ 164 $ 3,725 Liabilities: Energy-related derivatives (a) $ 16 $ 88 $ — $ — $ 104 Interest rate derivatives — 214 — — 214 Foreign currency derivatives — 228 — — 228 Contingent consideration — — 14 — 14 Other — 13 — — 13 Total $ 16 $ 543 $ 14 $ — $ 573 Fair Value Measurements Using: At June 30, 2022 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 131 $ — $ — $ 131 Nuclear decommissioning trusts: (b) Domestic equity 391 159 — — 550 Foreign equity 122 — — — 122 U.S. Treasury and government agency securities — 17 — — 17 Municipal bonds — 2 — — 2 Corporate bonds 1 227 — — 228 Mortgage and asset backed securities — 20 — — 20 Private equity — — — 164 164 Other 20 — — — 20 Cash equivalents 677 10 — — 687 Other investments — 27 — — 27 Total $ 1,211 $ 593 $ — $ 164 $ 1,968 Liabilities: Energy-related derivatives $ — $ 23 $ — $ — $ 23 Georgia Power Assets: Energy-related derivatives $ — $ 137 $ — $ — $ 137 Nuclear decommissioning trusts: (b)(c) Domestic equity 252 1 — — 253 Foreign equity — 142 — — 142 U.S. Treasury and government agency securities — 256 — — 256 Municipal bonds — 54 — — 54 Corporate bonds — 218 — — 218 Mortgage and asset backed securities — 69 — — 69 Other 16 17 — — 33 Cash equivalents 98 — — — 98 Total $ 366 $ 894 $ — $ — $ 1,260 Liabilities: Energy-related derivatives $ — $ 29 $ — $ — $ 29 Fair Value Measurements Using: At June 30, 2022 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 121 $ — $ — $ 121 Liabilities: Energy-related derivatives $ — $ 14 $ — $ — $ 14 Southern Power Assets: Energy-related derivatives $ — $ 6 $ — $ — $ 6 Liabilities: Energy-related derivatives $ — $ 1 $ — $ — $ 1 Foreign currency derivatives — 45 — — 45 Contingent consideration — — 14 — 14 Other — 13 — — 13 Total $ — $ 59 $ 14 $ — $ 73 Southern Company Gas Assets: Energy-related derivatives (a) $ 43 $ 13 $ — $ — $ 56 Non-qualified deferred compensation trusts: Domestic equity — 8 — — 8 Foreign equity — 2 — — 2 Pooled funds – fixed income — 9 — — 9 Cash equivalents 3 — — — 3 Cash equivalents and restricted cash 192 — — — 192 Total $ 238 $ 32 $ — $ — $ 270 Liabilities: Energy-related derivatives (a) $ 16 $ 20 $ — $ — $ 36 Interest rate derivatives — 62 — — 62 Total $ 16 $ 82 $ — $ — $ 98 (a) Excludes cash collateral of $13 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, 2022, approximately $65 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, 2022 and 2021. The changes were recorded as a change to the regulatory assets and liabilities related to AROs for Georgia Power and Alabama Power, respectively. Fair value increases (decreases) Three Months Ended June 30, 2022 Three Months Ended June 30, 2021 Six Months Ended June 30, 2022 Six Months Ended June 30, 2021 (in millions) Southern Company $ (230) $ 125 $ (380) $ 164 Alabama Power (125) 77 (192) 118 Georgia Power (105) 48 (188) 46 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" include 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, 2022, the fair value measurements of private equity 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 $164 million and unfunded commitments related to the private equity investments totaled $91 million. Private equity investments include high-quality private equity funds across several market sectors and funds that invest in real estate assets. Private equity 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, 2022, 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 $ 52.0 $ 9.8 $ 14.6 $ 1.5 $ 3.0 $ 6.8 Fair value 48.0 9.0 13.7 1.3 2.9 6.2 () 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, 2022
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. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' wholesale gas operations used various contracts in its commercial activities that generally met the definition of derivatives. 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. See Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information regarding the sale of Sequent. 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, 2022, 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 () 273 2030 2025 Alabama Power 65 2026 — Georgia Power 75 2025 — Mississippi Power 71 2026 — Southern Power 4 2030 — Southern Company Gas () 58 2024 2025 () 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 long natural gas positions of 64.4 million mmBtu and short natural gas positions of 6.4 million mmBtu at June 30, 2022, 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 15 million mmBtu for Southern Company, which includes 4 million mmBtu for Alabama Power, 5 million mmBtu for Georgia Power, 2 million mmBtu for Mississippi Power, and 4 million mmBtu for Southern Power. For cash flow hedges of energy-related derivatives, the estimated pre-tax gains expected to be reclassified from accumulated OCI to earnings for the 12-month period ending June 30, 2023 total $12 million for both Southern Company and Southern Company Gas and are immaterial for the other Registrants. 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, 2022, the following interest rate derivatives were outstanding: Notional Interest Weighted Hedge Fair Value Gain (Loss) at June 30, 2022 (in millions) (in millions) Cash Flow Hedges of Existing Debt Alabama Power $ 50 — 3.18% August 2027 $ — Southern Company Gas 250 — 3.26% August 2032 (5) Fair Value Hedges of Existing Debt Southern Company parent 400 1.75% 1-month LIBOR + 0.68% March 2028 (39) Southern Company parent 1,000 3.70% 1-month LIBOR + 2.36% April (113) Southern Company Gas 500 1.75% 1-month LIBOR + 0.38% January 2031 (57) Southern Company $ 2,200 $ (214) 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, 2023 total $(16) million for Southern Company and are immaterial for the other Registrants. 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, 2022, the following foreign currency derivatives were outstanding: Pay Notional Pay Receive Notional Receive Hedge Fair Value Gain (Loss) at June 30, 2022 (in millions) (in millions) (in millions) Fair Value Hedges of Existing Debt Southern Company parent $ 1,476 3.39% € 1,250 1.88% September 2027 $ (183) Cash Flow Hedges of Existing Debt Southern Power 564 3.78% 500 1.85% June 2026 (45) Southern Company $ 2,040 € 1,750 $ (228) 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, 2023 are $11 million for Southern Company and 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, 2022 At December 31, 2021 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Southern Company Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 267 $ 49 $ 129 $ 30 Other deferred charges and assets/Other deferred credits and liabilities 144 37 72 6 Total derivatives designated as hedging instruments for regulatory purposes $ 411 $ 86 $ 201 $ 36 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 17 $ 5 $ 7 $ 5 Other deferred charges and assets/Other deferred credits and liabilities 6 — 1 — Interest rate derivatives: Assets from risk management activities/Other current liabilities — 19 19 — Other deferred charges and assets/Other deferred credits and liabilities — 195 — 29 Foreign currency derivatives: Assets from risk management activities/Other current liabilities — 36 — 39 Other deferred charges and assets/Other deferred credits and liabilities — 192 — 40 Total derivatives designated as hedging instruments in cash flow and fair value hedges $ 23 $ 447 $ 27 $ 113 Derivatives not designated as hedging instruments Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 15 $ 12 $ 9 $ 4 Other deferred charges and assets/Other deferred credits and liabilities 2 1 1 — Total derivatives not designated as hedging instruments $ 17 $ 13 $ 10 $ 4 Gross amounts recognized $ 451 $ 546 $ 238 $ 153 Gross amounts offset (a) (87) (74) (25) (28) Net amounts recognized in the Balance Sheets (b) $ 364 $ 472 $ 213 $ 125 At June 30, 2022 At December 31, 2021 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Alabama Power Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Other current assets/Other current liabilities $ 76 $ 6 $ 30 $ 9 Other deferred charges and assets/Other deferred credits and liabilities 55 17 25 2 Total derivatives designated as hedging instruments for regulatory purposes $ 131 $ 23 $ 55 $ 11 Gross amounts offset (20) (20) (5) (5) Net amounts recognized in the Balance Sheets $ 111 $ 3 $ 50 $ 6 Georgia Power Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 102 $ 15 $ 54 $ 6 Other deferred charges and assets/Other deferred credits and liabilities 35 14 21 2 Total derivatives designated as hedging instruments for regulatory purposes $ 137 $ 29 $ 75 $ 8 Gross amounts offset (21) (21) (8) (8) Net amounts recognized in the Balance Sheets $ 116 $ 8 $ 67 $ — Mississippi Power Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 67 $ 8 $ 30 $ 3 Other deferred charges and assets/Other deferred credits and liabilities 54 6 26 2 Total derivatives designated as hedging instruments for regulatory purposes $ 121 $ 14 $ 56 $ 5 Gross amounts offset (11) (11) (4) (4) Net amounts recognized in the Balance Sheets $ 110 $ 3 $ 52 $ 1 At June 30, 2022 At December 31, 2021 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 $ — $ — $ 2 $ — Other deferred charges and assets/Other deferred credits and liabilities 4 — 1 — Foreign currency derivatives: Other current assets/Other current liabilities — 11 — 16 Other deferred charges and assets/Other deferred credits and liabilities — 34 — — Total derivatives designated as hedging instruments in cash flow and fair value hedges $ 4 $ 45 $ 3 $ 16 Derivatives not designated as hedging instruments Energy-related derivatives: Other current assets/Other current liabilities $ 1 $ 1 $ 1 $ — Other deferred charges and assets/Other deferred credits and liabilities 1 — — — Total derivatives not designated as hedging instruments $ 2 $ 1 $ 1 $ — Gross amounts recognized $ 6 $ 46 $ 4 $ 16 Gross amounts offset (1) (1) — — Net amounts recognized in the Balance Sheets $ 5 $ 45 $ 4 $ 16 At June 30, 2022 At December 31, 2021 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Southern Company Gas Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 23 $ 19 $ 15 $ 12 Total derivatives designated as hedging instruments for regulatory purposes $ 23 $ 19 $ 15 $ 12 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 17 $ 5 $ 5 $ 5 Other deferred charges and assets/Other deferred credits and liabilities 2 — — — Interest rate derivatives: Assets from risk management activities/Liabilities from risk management activities-current — — 6 — Other deferred charges and assets/Other deferred credits and liabilities — 62 — 6 Total derivatives designated as hedging instruments in cash flow and fair value hedges $ 19 $ 67 $ 11 $ 11 Derivatives not designated as hedging instruments Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 13 $ 11 $ 8 $ 4 Other deferred charges and assets/Other deferred credits and liabilities 1 1 1 — Total derivatives not designated as hedging instruments $ 14 $ 12 $ 9 $ 4 Gross amounts recognized $ 56 $ 98 $ 35 $ 27 Gross amounts offset (a) (34) (21) (8) (11) Net amounts recognized in the Balance Sheets (b) $ 22 $ 77 $ 27 $ 16 (a) Gross amounts offset include cash collateral held on deposit in broker margin accounts of $13 million and $3 million at June 30, 2022 and December 31, 2021, respectively. (b) Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives at December 31, 2021. There were no such amounts at June 30, 2022. Energy-related derivatives not designated as hedging instruments were immaterial for the traditional electric operating companies at June 30, 2022. There were no such instruments for the traditional electric operating companies at December 31, 2021. At June 30, 2022 and December 31, 2021, 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, 2022: Energy-related derivatives: Other regulatory assets, current $ (26) $ (2) $ (6) $ (3) $ (15) Other regulatory assets, deferred (3) (1) (1) (1) — Other regulatory liabilities, current 234 72 93 62 7 Other regulatory liabilities, deferred 110 39 22 49 — Total energy-related derivative gains (losses) $ 315 $ 108 $ 108 $ 107 $ (8) At December 31, 2021: Energy-related derivatives: Other regulatory assets, current $ (17) $ (6) $ — $ — $ (11) Other regulatory liabilities, current 107 28 48 27 4 Other regulatory liabilities, deferred 65 22 19 24 — Total energy-related derivative gains (losses) $ 155 $ 44 $ 67 $ 51 $ (7) For the three and six months ended June 30, 2022 and 2021, the pre-tax effects of cash flow and fair value hedge accounting on accumulated OCI were as follows: Gain (Loss) Recognized in OCI on Derivative For the Three Months Ended June 30, For the Six Months Ended June 30, 2022 2021 2022 2021 (in millions) (in millions) Southern Company Cash flow hedges: Energy-related derivatives $ (1) $ 16 $ 41 $ 20 Interest rate derivatives 21 (1) 30 2 Foreign currency derivatives (74) 4 (102) (43) Fair value hedges () : Foreign currency derivatives (7) — (3) — Total $ (61) $ 19 $ (34) $ (21) Georgia Power Interest rate derivatives $ 19 $ — $ 31 $ — Southern Power Cash flow hedges: Energy-related derivatives $ 2 $ 5 $ 7 $ 8 Foreign currency derivatives (74) 4 (102) (43) Total $ (72) $ 9 $ (95) $ (35) Southern Company Gas Cash flow hedges: Energy-related derivatives $ (2) $ 11 $ 35 $ 12 Interest rate derivatives (5) — (5) — Total $ (7) $ 11 $ 30 $ 12 () 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, 2022 and 2021, the pre-tax effects of interest rate derivatives designated as cash flow hedging instruments on accumulated OCI were immaterial for the other Registrants. For the three and six months ended June 30, 2022 and 2021, 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, 2022 2021 2022 2021 (in millions) (in millions) Southern Company Total cost of natural gas $ 452 $ 231 $ 1,546 $ 814 Gain (loss) on energy-related cash flow hedges (a) 10 1 18 (2) Total depreciation and amortization 913 891 1,805 1,762 Gain (loss) on energy-related cash flow hedges (a) 4 1 6 4 Total interest expense, net of amounts capitalized (488) (450) (950) (901) Gain (loss) on interest rate cash flow hedges (a) (6) (7) (13) (14) Gain (loss) on foreign currency cash flow hedges (a) (7) (6) (13) (12) Gain (loss) on interest rate fair value hedges (b) (76) (3) (198) (12) Total other income (expense), net 139 101 283 160 Gain (loss) on foreign currency cash flow hedges (a)(c) (73) 17 (97) (43) Gain (loss) on foreign currency fair value hedges (96) — (121) — Amount excluded from effectiveness testing recognized in earnings 7 — 3 — Southern Power Total depreciation and amortization $ 131 $ 132 $ 251 $ 251 Gain (loss) on energy-related cash flow hedges (a) 4 1 6 4 Total interest expense, net of amounts capitalized (36) (37) (73) (75) Gain (loss) on foreign currency cash flow hedges (a) (7) (6) (13) (12) Total other income (expense), net 1 1 3 8 Gain (loss) on foreign currency cash flow hedges (a)(c) (73) 17 (97) (43) Southern Company Gas Total cost of natural gas $ 452 $ 231 $ 1,546 $ 814 Gain (loss) on energy-related cash flow hedges (a) 10 — 18 (2) Total interest expense, net of amounts capitalized (61) (59) (122) (118) Gain (loss) on interest rate cash flow hedges (a) (1) (1) (1) (1) Gain (loss) on interest rate fair value hedges (b) (22) 4 (57) 4 (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. For the three and six months ended June 30, 2022 and 2021, 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. At June 30, 2022 and December 31, 2021, 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, 2022 At December 31, 2021 At June 30, 2022 At December 31, 2021 (in millions) (in millions) Southern Company Long-term debt $ (2,981) $ (3,280) $ 192 $ 9 Southern Company Gas Long-term debt $ (437) $ (493) $ 59 $ 2 For the three and six months ended June 30, 2022 and 2021, 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 2022 2021 2022 2021 (in millions) (in millions) Energy-related derivatives: Natural gas revenues () $ (15) $ (103) $ (13) $ (120) Cost of natural gas (25) 9 (5) 16 Total derivatives in non-designated hedging relationships $ (40) $ (94) $ (18) $ (104) (*) Excludes immaterial gains (losses) recorded in natural gas revenues associated with weather derivatives for all periods presented. For the three and six months ended June 30, 2022 and 2021, 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. At June 30, 2022, the Registrants had no collateral posted with derivative counterparties to satisfy these arrangements. For the applicable Registrants, the fair value of interest rate and 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, 2022. 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. Following the sale of Gulf Power to NextEra Energy, Inc., Gulf Power continued participating in the Southern Company power pool through July 13, 2022. Generally, collateral may be provided by a Southern Company guaranty, letter of credit, or cash. If collateral is required, fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against fair value amounts recognized for derivatives executed with the same counterparty. 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, 2022, cash collateral posted in these accounts was immaterial. 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, 2022, cash collateral held on deposit in broker margin accounts was $13 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.

Acquisitions and Dispositions

Acquisitions and Dispositions	6 Months Ended
Acquisitions and Dispositions	Jun. 30, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions and Dispositions	ACQUISITIONS AND DISPOSITIONSSee Note 15 to the financial statements in Item 8 of the Form 10-K for additional information. Southern Power Construction Projects During the six months ended June 30, 2022, Southern Power completed construction of and placed in service the remaining 40 MWs of the Tranquillity battery energy storage facility and the remaining 15 MWs of the Garland battery energy storage facility. Project Facility Resource Approximate Nameplate Capacity ( MW ) Location COD PPA Contract Period Projects Completed During the Six Months Ended June 30, 2022 Garland Solar Storage (a) Battery energy storage system 88 Kern County, CA September 2021 through February 2022 (b) 20 years Tranquillity Solar Storage (a) Battery energy storage system 72 Fresno County, CA November 2021 through March 2022 (c) 20 years (a) Southern Power consolidates each project's operating results in its financial statements and the tax equity partner and two other partners each own a noncontrolling interest. (b) The facility has a total capacity of 88 MWs, of which 73 MWs were placed in service in 2021 and 15 MWs were placed in service in February 2022. (c) The facility has a total capacity of 72 MWs, of which 32 MWs were placed in service in 2021 and 40 MWs were placed in service in March 2022. Southern Company Gas On May 20, 2022, Southern Company Gas received the final $5 million contingent payment from Dominion Modular LNG Holdings, Inc. in connection with its 2020 sale of Pivotal LNG, Inc.

Segment and Related Information

Segment and Related Information	6 Months Ended
Segment and Related Information	Jun. 30, 2022
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. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' other businesses also included wholesale gas 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 $232 million and $337 million for the three and six months ended June 30, 2022, respectively, and $112 million and $193 million for the three and six months ended June 30, 2021, respectively. Revenues from sales of natural gas from Southern Company Gas to the traditional electric operating companies were immaterial for all periods presented. Revenues from sales of natural gas from Southern Company Gas (prior to its sale of Sequent) to Southern Power were $6 million and $18 million for the three and six months ended June 30, 2021, respectively. 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 and, for the three and six months ended June 30, 2021, leveraged lease projects. 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, 2022 and 2021 was as follows: Electric Utilities Traditional Southern Eliminations Total Southern Company Gas All Eliminations Consolidated (in millions) 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)(b) 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)(b) 1,811 170 — 1,981 433 (263) (12) 2,139 At June 30, 2022 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 263 $ — $ 5,280 Total assets 92,742 13,402 (787) 105,357 23,618 2,457 (663) 130,769 Three Months Ended June 30, 2021 Operating revenues $ 4,031 $ 490 $ (114) $ 4,407 $ 677 $ 154 $ (40) $ 5,198 Segment net income (loss) (a)(b)(c) 511 36 — 547 (65) (108) (2) 372 Six Months Ended June 30, 2021 Operating revenues $ 7,795 $ 930 $ (201) $ 8,524 $ 2,371 $ 288 $ (75) $ 11,108 Segment net income (loss) (a)(b)(c)(d) 1,267 133 — 1,400 333 (216) (9) 1,508 At December 31, 2021 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 263 $ — $ 5,280 Total assets 89,051 13,390 (667) 101,774 23,560 2,975 (775) 127,534 (a) Attributable to Southern Company. (b) For the traditional electric operating companies, includes pre-tax charges at Georgia Power for estimated losses associated with the construction of Plant Vogtle Units 3 and 4 of $52 million ($39 million after tax) for the three and six months ended June 30, 2022 and $460 million ($343 million after tax) and $508 million ($379 million after tax) for the three and six months ended June 30, 2021, respectively. 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. (c) For Southern Company Gas, includes a pre-tax impairment charge of $82 million ($58 million after tax) related to its equity method investment in the PennEast Pipeline project. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information. (d) For Southern Power, includes gains on wind turbine equipment contributed to various equity method investments totaling approximately $37 million pre-tax ($28 million after tax). See Note 15 to the financial statements under "Southern Power – Development Projects" in Item 8 of the Form 10-K for additional information. Products and Services Electric Utilities' Revenues Retail Wholesale Other Total (in millions) Three Months Ended June 30, 2022 $ 4,789 $ 937 $ 280 $ 6,006 Three Months Ended June 30, 2021 3,599 546 262 4,407 Six Months Ended June 30, 2022 $ 8,402 $ 1,601 $ 513 $ 10,516 Six Months Ended June 30, 2021 6,941 1,091 492 8,524 Southern Company Gas' Revenues Gas Wholesale Gas Services () Gas Other Total (in millions) Three Months Ended June 30, 2022 $ 975 $ — $ 92 $ 16 $ 1,083 Three Months Ended June 30, 2021 706 (110) 64 17 677 Six Months Ended June 30, 2022 $ 2,765 $ — $ 335 $ 40 $ 3,140 Six Months Ended June 30, 2021 1,898 188 259 26 2,371 () Prior to the sale of Sequent, the revenues for wholesale gas services were netted with costs associated with its energy and risk management activities. See "Southern Company Gas" herein and Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information. Southern Company Gas Southern Company Gas manages its business through three reportable segments – gas distribution operations, gas pipeline investments, and gas marketing services. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' reportable segments also included wholesale gas services. The non-reportable segments are combined and presented as all other. See Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information on the sale of Sequent. 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. Gas pipeline investments also includes a 20% ownership interest in the PennEast Pipeline project, which was cancelled in September 2021. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information. Through July 1, 2021, wholesale gas services provided natural gas asset management and/or related logistics services for each of Southern Company Gas' utilities except Nicor Gas as well as for non-affiliated companies. Additionally, wholesale gas services engaged in natural gas storage and gas pipeline arbitrage and related activities. 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. Business segment financial data for the three and six months ended June 30, 2022 and 2021 was as follows: Gas Distribution Operations Gas Pipeline Investments Wholesale Gas Services (a) Gas Marketing Services Total All Other Eliminations Consolidated (in millions) 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 (loss) 306 52 — 67 425 8 — 433 Total assets at June 30, 2022 21,183 1,433 — 1,554 24,170 11,999 (12,551) 23,618 Three Months Ended June 30, 2021 Operating revenues $ 710 $ 8 $ (110) $ 64 $ 672 $ 11 $ (6) $ 677 Segment net income (loss) (b) 80 (36) (112) 6 (62) (3) — (65) Six Months Ended June 30, 2021 Operating revenues $ 1,910 $ 16 $ 188 $ 259 $ 2,373 $ 18 $ (20) $ 2,371 Segment net income (loss) (b) 263 (7) 14 62 332 1 — 333 Total assets at December 31, 2021 20,917 1,467 31 1,556 23,971 12,114 (12,525) 23,560 (a) As a result of the sale of Sequent, wholesale gas services is no longer a reportable segment for the three and six months ended June 30, 2022. Prior to the sale of Sequent, the revenues for wholesale gas services were netted with costs associated with its energy and risk management activities. A reconciliation of operating revenues and intercompany revenues is shown in the following table. Third Party Gross Revenues Intercompany Revenues Total Gross Revenues Less Gross Gas Costs Operating Revenues (in millions) Three Months Ended June 30, 2021 $ 1,292 $ 27 $ 1,319 $ 1,429 $ (110) Six Months Ended June 30, 2021 3,881 90 3,971 3,783 188 (b) For gas pipeline investments, includes a pre-tax impairment charge of $82 million ($58 million after tax) related to the equity method investment in the PennEast Pipeline project. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.

Introduction (Policies)

Introduction (Policies)	6 Months Ended
Introduction (Policies)	Jun. 30, 2022
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, 2021 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, 2022 and 2021. 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 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.
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. Prior to the sale of Sequent on July 1, 2021, Southern Company Gas' wholesale gas operations used various contracts in its commercial activities that generally met the definition of derivatives. 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. See Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information regarding the sale of Sequent. 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.

Introduction (Tables)

Introduction (Tables)	6 Months Ended
Introduction (Tables)	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Goodwill	Goodwill at June 30, 2022 and December 31, 2021 was as follows: Goodwill (in millions) Southern Company $ 5,280 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, 2022 At December 31, 2021 Gross Carrying Amount Accumulated Amortization Other Gross Carrying Amount Accumulated Amortization Other (in millions) (in millions) Southern Company Other intangible assets subject to amortization: Customer relationships $ 212 $ (157) $ 55 $ 212 $ (150) $ 62 Trade names 64 (41) 23 64 (38) 26 PPA fair value adjustments 390 (119) 271 390 (109) 281 Other 10 (9) 1 11 (10) 1 Total other intangible assets subject to amortization $ 676 $ (326) $ 350 $ 677 $ (307) $ 370 Other intangible assets not subject to amortization: Federal Communications Commission licenses 75 — 75 75 — 75 Total other intangible assets $ 751 $ (326) $ 425 $ 752 $ (307) $ 445 Southern Power Other intangible assets subject to amortization: PPA fair value adjustments $ 390 $ (119) $ 271 $ 390 $ (109) $ 281 Southern Company Gas Other intangible assets subject to amortization: Gas marketing services Customer relationships $ 156 $ (135) $ 21 $ 156 $ (130) $ 26 Trade names 26 (16) 10 26 (15) 11 Total other intangible assets subject to amortization $ 182 $ (151) $ 31 $ 182 $ (145) $ 37
Schedule of Other Intangible Assets, Finite-Lived	Other intangible assets were as follows: At June 30, 2022 At December 31, 2021 Gross Carrying Amount Accumulated Amortization Other Gross Carrying Amount Accumulated Amortization Other (in millions) (in millions) Southern Company Other intangible assets subject to amortization: Customer relationships $ 212 $ (157) $ 55 $ 212 $ (150) $ 62 Trade names 64 (41) 23 64 (38) 26 PPA fair value adjustments 390 (119) 271 390 (109) 281 Other 10 (9) 1 11 (10) 1 Total other intangible assets subject to amortization $ 676 $ (326) $ 350 $ 677 $ (307) $ 370 Other intangible assets not subject to amortization: Federal Communications Commission licenses 75 — 75 75 — 75 Total other intangible assets $ 751 $ (326) $ 425 $ 752 $ (307) $ 445 Southern Power Other intangible assets subject to amortization: PPA fair value adjustments $ 390 $ (119) $ 271 $ 390 $ (109) $ 281 Southern Company Gas Other intangible assets subject to amortization: Gas marketing services Customer relationships $ 156 $ (135) $ 21 $ 156 $ (130) $ 26 Trade names 26 (16) 10 26 (15) 11 Total other intangible assets subject to amortization $ 182 $ (151) $ 31 $ 182 $ (145) $ 37
Schedule of Amortization of Other Intangible Assets	Amortization associated with other intangible assets was as follows: Three Months Ended Six Months Ended June 30, 2022 (in millions) Southern Company (a) $ 9 $ 19 Southern Power (b) 5 10 Southern Company Gas 2 5 (a) Includes $5 million and $10 million for the three and six months ended June 30, 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 Southern Southern June 30, 2022 December 31, 2021 June 30, 2022 December 31, 2021 June 30, 2022 December 31, 2021 (in millions) Cash and cash equivalents $ 1,724 $ 1,798 $ 202 $ 107 $ 217 $ 45 Restricted cash (a) : Other current assets 2 2 — — 2 2 Other deferred charges and assets 9 29 9 29 — — Total cash, cash equivalents, and restricted cash (b) $ 1,735 $ 1,829 $ 211 $ 135 $ 218 $ 48 (a) For Southern Power, reflects $9 million and $10 million at June 30, 2022 and December 31, 2021, respectively, held to fund estimated construction completion costs at the Deuel Harvest wind facility and $19 million at December 31, 2021 related to tax equity contributions restricted until the Garland battery energy storage facility achieved final contracted capacity. 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 Southern Southern June 30, 2022 December 31, 2021 June 30, 2022 December 31, 2021 June 30, 2022 December 31, 2021 (in millions) Cash and cash equivalents $ 1,724 $ 1,798 $ 202 $ 107 $ 217 $ 45 Restricted cash (a) : Other current assets 2 2 — — 2 2 Other deferred charges and assets 9 29 9 29 — — Total cash, cash equivalents, and restricted cash (b) $ 1,735 $ 1,829 $ 211 $ 135 $ 218 $ 48 (a) For Southern Power, reflects $9 million and $10 million at June 30, 2022 and December 31, 2021, respectively, held to fund estimated construction completion costs at the Deuel Harvest wind facility and $19 million at December 31, 2021 related to tax equity contributions restricted until the Garland battery energy storage facility achieved final contracted capacity. For Southern Company Gas, reflects collateral for workers' compensation, life insurance, and long-term disability insurance. (b) Total may not add due to rounding.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
Regulatory Matters (Tables)	Jun. 30, 2022
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, 2022 and December 31, 2021 were as follows: Regulatory Clause Balance Sheet Line Item June 30, December 31, 2021 (in millions) Alabama Power Rate CNP Compliance Other regulatory assets, deferred $ 29 $ 16 Rate CNP PPA Other regulatory assets, deferred 93 84 Retail Energy Cost Recovery () Other regulatory assets, current 60 — Other regulatory assets, deferred 191 126 Georgia Power Fuel Cost Recovery Deferred under recovered fuel clause revenues $ 948 $ 410 Mississippi Power Fuel Cost Recovery Other customer accounts receivable $ 29 $ 4 Ad Valorem Tax Other regulatory assets, current 12 12 Other regulatory assets, deferred 29 37 Southern Company Gas Natural Gas Cost Recovery Natural gas cost under recovery $ 361 $ 266 Other regulatory assets, deferred 15 207 () In accordance with an Alabama PSC order issued on February 1, 2022, Alabama Power applied $126 million of its 2021 Rate RSE refund to reduce the Rate ECR under recovered balance.
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 the end of the first quarter 2023 and the fourth quarter 2023, respectively, is as follows: (in millions) Base project capital cost forecast (a)(b) $ 10,393 Construction contingency estimate 60 Total project capital cost forecast (a)(b) 10,453 Net investment at June 30, 2022 (b) (8,966) Remaining estimate to complete $ 1,487 (a) Includes approximately $590 million of costs that are not shared with the other Vogtle Owners and approximately $455 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 $385 million, of which $247 million had been accrued through June 30, 2022. (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	Georgia Power has requested recovery of the proposed increases through its existing base rate tariffs as follows: Tariff 2023 2024 2025 (in millions) Traditional base $ 739 $ — $ — ECCR Traditional (1) — — CCR ARO (a) 64 78 47 DSM (a) 30 27 (2) Municipal Franchise Fee 20 2 1 Total (b) $ 852 $ 107 $ 45 (a) As determined by the Georgia PSC through annual compliance filings. (b) Totals may not add due to rounding. Capital expenditures incurred under specific infrastructure replacement programs and capital projects during the first six months of 2022 were as follows: Utility Program Six Months Ended June 30, 2022 (in millions) Nicor Gas Investing in Illinois $ 177 Virginia Natural Gas Steps to Advance Virginia's Energy 33 Atlanta Gas Light System Reinforcement Rider 28 Chattanooga Gas Pipeline Replacement Program 2 Total $ 240

Revenue from Contracts with C_2

Revenue from Contracts with Customers and Lease Income (Tables)	6 Months Ended
	Jun. 30, 2022
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, 2022 and 2021: 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 (a) 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 (a) 1,368 392 654 23 292 35 Total operating revenues $ 13,854 $ 3,580 $ 5,328 $ 769 $ 1,438 $ 3,140 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2021 Operating revenues Retail electric revenues Residential $ 1,469 $ 553 $ 852 $ 64 $ — $ — Commercial 1,176 386 724 66 — — Industrial 728 334 321 73 — — Other 23 4 17 2 — — Total retail electric revenues 3,396 1,277 1,914 205 — — Natural gas distribution revenues Residential 311 — — — — 311 Commercial 73 — — — — 73 Transportation 247 — — — — 247 Industrial 8 — — — — 8 Other 59 — — — — 59 Total natural gas distribution revenues 698 — — — — 698 Wholesale electric revenues PPA energy revenues 209 38 16 2 158 — PPA capacity revenues 118 29 14 1 75 — Non-PPA revenues 55 25 3 75 78 — Total wholesale electric revenues 382 92 33 78 311 — Other natural gas revenues Wholesale gas services 578 — — — — 578 Gas marketing services 63 — — — — 63 Other natural gas revenues 10 — — — — 10 Total natural gas revenues 651 — — — — 651 Other revenues 295 52 137 7 5 — Total revenue from contracts with customers 5,422 1,421 2,084 290 316 1,349 Other revenue sources (a) 1,179 135 141 13 174 731 Other adjustments (b) (1,403) — — — — (1,403) Total operating revenues $ 5,198 $ 1,556 $ 2,225 $ 303 $ 490 $ 677 Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Six Months Ended June 30, 2021 Operating revenues Retail electric revenues Residential $ 2,936 $ 1,181 $ 1,627 $ 128 $ — $ — Commercial 2,294 758 1,410 126 — — Industrial 1,397 654 606 137 — — Other 47 9 34 4 — — Total retail electric revenues 6,674 2,602 3,677 395 — — Natural gas distribution revenues Residential 925 — — — — 925 Commercial 243 — — — — 243 Transportation 536 — — — — 536 Industrial 24 — — — — 24 Other 155 — — — — 155 Total natural gas distribution revenues 1,883 — — — — 1,883 Wholesale electric revenues PPA energy revenues 422 81 30 7 313 — PPA capacity revenues 237 58 27 4 150 — Non-PPA revenues 119 57 12 162 139 — Total wholesale electric revenues 778 196 69 173 602 — Other natural gas revenues Wholesale gas services 2,168 — — — — 2,168 Gas marketing services 257 — — — — 257 Other natural gas revenues 17 — — — — 17 Total natural gas revenues 2,442 — — — — 2,442 Other revenues 542 97 249 14 9 — Total revenue from contracts with customers 12,319 2,895 3,995 582 611 4,325 Other revenue sources (a) 2,488 220 200 28 319 1,745 Other adjustments (b) (3,699) — — — — (3,699) Total operating revenues $ 11,108 $ 3,115 $ 4,195 $ 610 $ 930 $ 2,371 (a) 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. (b) Other adjustments relate to the cost of Southern Company Gas' energy and risk management activities. Wholesale gas services revenues are presented net of the related costs of those activities on the statement of income. See Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K and Note (L) under "Southern Company Gas" for information on the sale of Sequent and components of wholesale gas services' operating revenues, respectively.
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, 2022 and December 31, 2021: Southern Company Alabama Power Georgia Power Mississippi Power Southern Power Southern Company Gas (in millions) Accounts Receivable At June 30, 2022 $ 3,021 $ 773 $ 1,217 $ 95 $ 278 $ 504 At December 31, 2021 2,504 589 736 73 149 753 Contract Assets At June 30, 2022 $ 102 $ — $ 38 $ — $ — $ — At December 31, 2021 117 2 63 — 1 — Contract Liabilities At June 30, 2022 $ 70 $ 3 $ 25 $ 4 $ 1 $ — At December 31, 2021 57 4 14 — 1 —
Schedule of Remaining Performance Obligations	Revenues from contracts with customers related to these performance obligations remaining at June 30, 2022 are expected to be recognized as follows: 2022 (remaining) 2023 2024 2025 2026 Thereafter (in millions) Southern Company $ 347 $ 617 $ 414 $ 322 $ 307 $ 2,340 Alabama Power 15 24 7 5 — — Georgia Power 39 63 30 22 11 21 Southern Power 184 347 344 294 299 2,334 Southern Company Gas 16 29 29 — — —
Schedule of Lease Income	Lease income for the three and six months ended June 30, 2022 and 2021 is as follows: Southern Alabama Power Georgia Power Mississippi Southern Power Southern Company Gas (in millions) 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 For the Three Months Ended June 30, 2021 Lease income - interest income on sales-type leases $ 4 $ — $ — $ 4 $ — $ — Lease income - operating leases 56 21 10 — 21 9 Variable lease income 128 (1) — — 138 — Total lease income $ 188 $ 20 $ 10 $ 4 $ 159 $ 9 For the Six Months Ended June 30, 2021 Lease income - interest income on sales-type leases $ 7 $ — $ — $ 7 $ — $ — Lease income - operating leases 112 41 21 1 42 17 Variable lease income 212 — — — 228 — Total lease income $ 331 $ 41 $ 21 $ 8 $ 270 $ 17

Consolidated Entities and Equ_2

Consolidated Entities and Equity Method Investments (Tables)	6 Months Ended
	Jun. 30, 2022
Regulated Operations [Abstract]
Schedule of Equity Method Investments	The carrying amounts of Southern Company Gas' equity method investments at June 30, 2022 and December 31, 2021 and related earnings (loss) from those investments for the three and six months ended June 30, 2022 and 2021 were as follows: Investment Balance June 30, 2022 December 31, 2021 (in millions) SNG $ 1,099 $ 1,129 Other () 35 44 Total $ 1,134 $ 1,173 () Balance at June 30, 2022 reflects a $9 million distribution from PennEast Pipeline.
Schedule of Earnings (Loss) from Equity Method Investments	Three Months Ended June 30, Six Months Ended June 30, Earnings (Loss) from Equity Method Investments 2022 2021 2022 2021 (in millions) SNG $ 31 $ 28 $ 70 $ 66 PennEast Pipeline () — (81) — (79) Other — 1 1 2 Total $ 31 $ (52) $ 71 $ (11) () Includes a pre-tax impairment charge of $82 million ($58 million after tax) for the three and six months ended June 30, 2021. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.

Financing and Leases (Tables)

Financing and Leases (Tables)	6 Months Ended
Financing and Leases (Tables)	Jun. 30, 2022
Debt Disclosure [Abstract]
Schedule of Credit Arrangements	At June 30, 2022, committed credit arrangements with banks were as follows: Expires Company 2023 2024 2025 2026 Total Unused Expires within (in millions) Southern Company parent $ — $ — $ — $ 2,000 $ 2,000 $ 1,998 $ — Alabama Power — 550 — 700 1,250 1,250 — Georgia Power — — — 1,750 1,750 1,726 — Mississippi Power — 150 125 — 275 275 — Southern Power (a) — — — 600 600 568 — Southern Company Gas (b) 250 — — 1,500 1,750 1,748 250 SEGCO 30 — — — 30 30 30 Southern Company $ 280 $ 700 $ 125 $ 6,550 $ 7,655 $ 7,595 $ 280 (a) Does not include Southern Power Company's two $75 million continuing letter of credit facilities for standby letters of credit, expiring in 2023 and 2025, respectively, of which $11 million and $5 million, respectively, was unused at June 30, 2022. Southern Power's subsidiaries are not parties to its bank credit arrangements or letter of credit facilities. (b) 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 2026. Southern Company Gas' committed credit arrangement expiring in 2026 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 2026, the allocations between Southern Company Gas Capital and Nicor Gas may be adjusted. Nicor Gas is also the borrower of a new $250 million credit arrangement expiring in 2023.
Schedule of Shares Used to Compute Diluted Earnings Per Share	Shares used to compute diluted earnings per share were as follows: Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 (in millions) As reported shares 1,065 1,061 1,064 1,060 Effect of stock-based compensation 5 6 5 6 Effect of equity units 2 — 1 — Diluted shares 1,072 1,067 1,070 1,066

Retirement Benefits (Tables)

Retirement Benefits (Tables)	6 Months Ended
Retirement Benefits (Tables)	Jun. 30, 2022
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, 2022 and 2021 are presented in the following tables. 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 cost (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 Southern Alabama Georgia Mississippi Southern Power Southern Company Gas (in millions) Three Months Ended June 30, 2021 Pension Plans Service cost $ 108 $ 25 $ 28 $ 5 $ 3 $ 9 Interest cost 86 21 26 4 1 6 Expected return on plan assets (297) (71) (94) (13) (4) (22) Amortization: Prior service costs — — 1 — — — Regulatory asset — — — — — 4 Net loss 79 20 25 3 1 3 Net periodic pension cost (income) $ (24) $ (5) $ (14) $ (1) $ 1 $ — Postretirement Benefits Service cost $ 6 $ 2 $ 1 $ — $ — $ 1 Interest cost 9 2 3 1 — 1 Expected return on plan assets (19) (7) (6) (1) — (2) Amortization: Prior service costs (1) — — — — — Regulatory asset — — — — — 1 Net loss 1 — — — — — Net periodic postretirement benefit cost (income) $ (4) $ (3) $ (2) $ — $ — $ 1 Six Months Ended June 30, 2021 Pension Plans Service cost $ 217 $ 51 $ 56 $ 9 $ 5 $ 18 Interest cost 173 41 52 8 2 12 Expected return on plan assets (595) (143) (188) (27) (7) (43) Amortization: Prior service costs — — 1 — — (1) Regulatory asset — — — — — 8 Net loss 157 41 50 7 2 6 Net periodic pension cost (income) $ (48) $ (10) $ (29) $ (3) $ 2 $ — Postretirement Benefits Service cost $ 12 $ 3 $ 3 $ — $ — $ 1 Interest cost 17 4 6 1 — 2 Expected return on plan assets (38) (14) (13) (1) — (4) Amortization: Prior service costs (1) — — — — — Regulatory asset — — — — — 3 Net (gain)/loss 2 — 1 — — (1) Net periodic postretirement benefit cost (income) $ (8) $ (7) $ (3) $ — $ — $ 1

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
Fair Value Measurements (Tables)	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value	At June 30, 2022, 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, 2022 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Southern Company Assets: Energy-related derivatives (a) $ 43 $ 408 $ — $ — $ 451 Investments in trusts: (b)(c) Domestic equity 643 168 — — 811 Foreign equity 122 144 — — 266 U.S. Treasury and government agency securities — 273 — — 273 Municipal bonds — 56 — — 56 Pooled funds – fixed income — 9 — — 9 Corporate bonds 1 445 — — 446 Mortgage and asset backed securities — 89 — — 89 Private equity — — — 164 164 Cash and cash equivalents 3 — — — 3 Other 36 17 — — 53 Cash equivalents 1,058 10 — — 1,068 Other investments 9 27 — — 36 Total $ 1,915 $ 1,646 $ — $ 164 $ 3,725 Liabilities: Energy-related derivatives (a) $ 16 $ 88 $ — $ — $ 104 Interest rate derivatives — 214 — — 214 Foreign currency derivatives — 228 — — 228 Contingent consideration — — 14 — 14 Other — 13 — — 13 Total $ 16 $ 543 $ 14 $ — $ 573 Fair Value Measurements Using: At June 30, 2022 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Alabama Power Assets: Energy-related derivatives $ — $ 131 $ — $ — $ 131 Nuclear decommissioning trusts: (b) Domestic equity 391 159 — — 550 Foreign equity 122 — — — 122 U.S. Treasury and government agency securities — 17 — — 17 Municipal bonds — 2 — — 2 Corporate bonds 1 227 — — 228 Mortgage and asset backed securities — 20 — — 20 Private equity — — — 164 164 Other 20 — — — 20 Cash equivalents 677 10 — — 687 Other investments — 27 — — 27 Total $ 1,211 $ 593 $ — $ 164 $ 1,968 Liabilities: Energy-related derivatives $ — $ 23 $ — $ — $ 23 Georgia Power Assets: Energy-related derivatives $ — $ 137 $ — $ — $ 137 Nuclear decommissioning trusts: (b)(c) Domestic equity 252 1 — — 253 Foreign equity — 142 — — 142 U.S. Treasury and government agency securities — 256 — — 256 Municipal bonds — 54 — — 54 Corporate bonds — 218 — — 218 Mortgage and asset backed securities — 69 — — 69 Other 16 17 — — 33 Cash equivalents 98 — — — 98 Total $ 366 $ 894 $ — $ — $ 1,260 Liabilities: Energy-related derivatives $ — $ 29 $ — $ — $ 29 Fair Value Measurements Using: At June 30, 2022 Quoted Prices Significant Significant Net Asset Value as a Practical Expedient (NAV) Total (in millions) Mississippi Power Assets: Energy-related derivatives $ — $ 121 $ — $ — $ 121 Liabilities: Energy-related derivatives $ — $ 14 $ — $ — $ 14 Southern Power Assets: Energy-related derivatives $ — $ 6 $ — $ — $ 6 Liabilities: Energy-related derivatives $ — $ 1 $ — $ — $ 1 Foreign currency derivatives — 45 — — 45 Contingent consideration — — 14 — 14 Other — 13 — — 13 Total $ — $ 59 $ 14 $ — $ 73 Southern Company Gas Assets: Energy-related derivatives (a) $ 43 $ 13 $ — $ — $ 56 Non-qualified deferred compensation trusts: Domestic equity — 8 — — 8 Foreign equity — 2 — — 2 Pooled funds – fixed income — 9 — — 9 Cash equivalents 3 — — — 3 Cash equivalents and restricted cash 192 — — — 192 Total $ 238 $ 32 $ — $ — $ 270 Liabilities: Energy-related derivatives (a) $ 16 $ 20 $ — $ — $ 36 Interest rate derivatives — 62 — — 62 Total $ 16 $ 82 $ — $ — $ 98 (a) Excludes cash collateral of $13 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, 2022, approximately $65 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, 2022 and 2021. The changes were recorded as a change to the regulatory assets and liabilities related to AROs for Georgia Power and Alabama Power, respectively. Fair value increases (decreases) Three Months Ended June 30, 2022 Three Months Ended June 30, 2021 Six Months Ended June 30, 2022 Six Months Ended June 30, 2021 (in millions) Southern Company $ (230) $ 125 $ (380) $ 164 Alabama Power (125) 77 (192) 118 Georgia Power (105) 48 (188) 46
Schedule of Financial Instruments for which Carrying Amount Did Not Equal Fair Value	At June 30, 2022, 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 $ 52.0 $ 9.8 $ 14.6 $ 1.5 $ 3.0 $ 6.8 Fair value 48.0 9.0 13.7 1.3 2.9 6.2 () 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, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Energy-Related Derivatives	At June 30, 2022, 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 () 273 2030 2025 Alabama Power 65 2026 — Georgia Power 75 2025 — Mississippi Power 71 2026 — Southern Power 4 2030 — Southern Company Gas () 58 2024 2025 (*) 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 long natural gas positions of 64.4 million mmBtu and short natural gas positions of 6.4 million mmBtu at June 30, 2022, which is also included in Southern Company's total volume.
Schedule of Interest Rate Derivatives	At June 30, 2022, the following interest rate derivatives were outstanding: Notional Interest Weighted Hedge Fair Value Gain (Loss) at June 30, 2022 (in millions) (in millions) Cash Flow Hedges of Existing Debt Alabama Power $ 50 — 3.18% August 2027 $ — Southern Company Gas 250 — 3.26% August 2032 (5) Fair Value Hedges of Existing Debt Southern Company parent 400 1.75% 1-month LIBOR + 0.68% March 2028 (39) Southern Company parent 1,000 3.70% 1-month LIBOR + 2.36% April (113) Southern Company Gas 500 1.75% 1-month LIBOR + 0.38% January 2031 (57) Southern Company $ 2,200 $ (214)
Schedule of Foreign Currency Derivatives	At June 30, 2022, the following foreign currency derivatives were outstanding: Pay Notional Pay Receive Notional Receive Hedge Fair Value Gain (Loss) at June 30, 2022 (in millions) (in millions) (in millions) Fair Value Hedges of Existing Debt Southern Company parent $ 1,476 3.39% € 1,250 1.88% September 2027 $ (183) Cash Flow Hedges of Existing Debt Southern Power 564 3.78% 500 1.85% June 2026 (45) Southern Company $ 2,040 € 1,750 $ (228)
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, 2022 At December 31, 2021 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Southern Company Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 267 $ 49 $ 129 $ 30 Other deferred charges and assets/Other deferred credits and liabilities 144 37 72 6 Total derivatives designated as hedging instruments for regulatory purposes $ 411 $ 86 $ 201 $ 36 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 17 $ 5 $ 7 $ 5 Other deferred charges and assets/Other deferred credits and liabilities 6 — 1 — Interest rate derivatives: Assets from risk management activities/Other current liabilities — 19 19 — Other deferred charges and assets/Other deferred credits and liabilities — 195 — 29 Foreign currency derivatives: Assets from risk management activities/Other current liabilities — 36 — 39 Other deferred charges and assets/Other deferred credits and liabilities — 192 — 40 Total derivatives designated as hedging instruments in cash flow and fair value hedges $ 23 $ 447 $ 27 $ 113 Derivatives not designated as hedging instruments Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 15 $ 12 $ 9 $ 4 Other deferred charges and assets/Other deferred credits and liabilities 2 1 1 — Total derivatives not designated as hedging instruments $ 17 $ 13 $ 10 $ 4 Gross amounts recognized $ 451 $ 546 $ 238 $ 153 Gross amounts offset (a) (87) (74) (25) (28) Net amounts recognized in the Balance Sheets (b) $ 364 $ 472 $ 213 $ 125 At June 30, 2022 At December 31, 2021 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Alabama Power Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Other current assets/Other current liabilities $ 76 $ 6 $ 30 $ 9 Other deferred charges and assets/Other deferred credits and liabilities 55 17 25 2 Total derivatives designated as hedging instruments for regulatory purposes $ 131 $ 23 $ 55 $ 11 Gross amounts offset (20) (20) (5) (5) Net amounts recognized in the Balance Sheets $ 111 $ 3 $ 50 $ 6 Georgia Power Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 102 $ 15 $ 54 $ 6 Other deferred charges and assets/Other deferred credits and liabilities 35 14 21 2 Total derivatives designated as hedging instruments for regulatory purposes $ 137 $ 29 $ 75 $ 8 Gross amounts offset (21) (21) (8) (8) Net amounts recognized in the Balance Sheets $ 116 $ 8 $ 67 $ — Mississippi Power Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 67 $ 8 $ 30 $ 3 Other deferred charges and assets/Other deferred credits and liabilities 54 6 26 2 Total derivatives designated as hedging instruments for regulatory purposes $ 121 $ 14 $ 56 $ 5 Gross amounts offset (11) (11) (4) (4) Net amounts recognized in the Balance Sheets $ 110 $ 3 $ 52 $ 1 At June 30, 2022 At December 31, 2021 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 $ — $ — $ 2 $ — Other deferred charges and assets/Other deferred credits and liabilities 4 — 1 — Foreign currency derivatives: Other current assets/Other current liabilities — 11 — 16 Other deferred charges and assets/Other deferred credits and liabilities — 34 — — Total derivatives designated as hedging instruments in cash flow and fair value hedges $ 4 $ 45 $ 3 $ 16 Derivatives not designated as hedging instruments Energy-related derivatives: Other current assets/Other current liabilities $ 1 $ 1 $ 1 $ — Other deferred charges and assets/Other deferred credits and liabilities 1 — — — Total derivatives not designated as hedging instruments $ 2 $ 1 $ 1 $ — Gross amounts recognized $ 6 $ 46 $ 4 $ 16 Gross amounts offset (1) (1) — — Net amounts recognized in the Balance Sheets $ 5 $ 45 $ 4 $ 16 At June 30, 2022 At December 31, 2021 Derivative Category and Balance Sheet Location Assets Liabilities Assets Liabilities (in millions) (in millions) Southern Company Gas Derivatives designated as hedging instruments for regulatory purposes Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 23 $ 19 $ 15 $ 12 Total derivatives designated as hedging instruments for regulatory purposes $ 23 $ 19 $ 15 $ 12 Derivatives designated as hedging instruments in cash flow and fair value hedges Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 17 $ 5 $ 5 $ 5 Other deferred charges and assets/Other deferred credits and liabilities 2 — — — Interest rate derivatives: Assets from risk management activities/Liabilities from risk management activities-current — — 6 — Other deferred charges and assets/Other deferred credits and liabilities — 62 — 6 Total derivatives designated as hedging instruments in cash flow and fair value hedges $ 19 $ 67 $ 11 $ 11 Derivatives not designated as hedging instruments Energy-related derivatives: Assets from risk management activities/Other current liabilities $ 13 $ 11 $ 8 $ 4 Other deferred charges and assets/Other deferred credits and liabilities 1 1 1 — Total derivatives not designated as hedging instruments $ 14 $ 12 $ 9 $ 4 Gross amounts recognized $ 56 $ 98 $ 35 $ 27 Gross amounts offset (a) (34) (21) (8) (11) Net amounts recognized in the Balance Sheets (b) $ 22 $ 77 $ 27 $ 16 (a) Gross amounts offset include cash collateral held on deposit in broker margin accounts of $13 million and $3 million at June 30, 2022 and December 31, 2021, respectively. (b) Net amounts of derivative instruments outstanding exclude immaterial premium and intrinsic value associated with weather derivatives at December 31, 2021. There were no such amounts at June 30, 2022.
Schedule of Pre-tax Effects of Unrealized Derivative Gains (Losses)	At June 30, 2022 and December 31, 2021, 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, 2022: Energy-related derivatives: Other regulatory assets, current $ (26) $ (2) $ (6) $ (3) $ (15) Other regulatory assets, deferred (3) (1) (1) (1) — Other regulatory liabilities, current 234 72 93 62 7 Other regulatory liabilities, deferred 110 39 22 49 — Total energy-related derivative gains (losses) $ 315 $ 108 $ 108 $ 107 $ (8) At December 31, 2021: Energy-related derivatives: Other regulatory assets, current $ (17) $ (6) $ — $ — $ (11) Other regulatory liabilities, current 107 28 48 27 4 Other regulatory liabilities, deferred 65 22 19 24 — Total energy-related derivative gains (losses) $ 155 $ 44 $ 67 $ 51 $ (7)
Schedule of Pre-Tax Effects of Hedging on AOCI	For the three and six months ended June 30, 2022 and 2021, the pre-tax effects of cash flow and fair value hedge accounting on accumulated OCI were as follows: Gain (Loss) Recognized in OCI on Derivative For the Three Months Ended June 30, For the Six Months Ended June 30, 2022 2021 2022 2021 (in millions) (in millions) Southern Company Cash flow hedges: Energy-related derivatives $ (1) $ 16 $ 41 $ 20 Interest rate derivatives 21 (1) 30 2 Foreign currency derivatives (74) 4 (102) (43) Fair value hedges () : Foreign currency derivatives (7) — (3) — Total $ (61) $ 19 $ (34) $ (21) Georgia Power Interest rate derivatives $ 19 $ — $ 31 $ — Southern Power Cash flow hedges: Energy-related derivatives $ 2 $ 5 $ 7 $ 8 Foreign currency derivatives (74) 4 (102) (43) Total $ (72) $ 9 $ (95) $ (35) Southern Company Gas Cash flow hedges: Energy-related derivatives $ (2) $ 11 $ 35 $ 12 Interest rate derivatives (5) — (5) — Total $ (7) $ 11 $ 30 $ 12 () 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, 2022 and 2021, 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, 2022 2021 2022 2021 (in millions) (in millions) Southern Company Total cost of natural gas $ 452 $ 231 $ 1,546 $ 814 Gain (loss) on energy-related cash flow hedges (a) 10 1 18 (2) Total depreciation and amortization 913 891 1,805 1,762 Gain (loss) on energy-related cash flow hedges (a) 4 1 6 4 Total interest expense, net of amounts capitalized (488) (450) (950) (901) Gain (loss) on interest rate cash flow hedges (a) (6) (7) (13) (14) Gain (loss) on foreign currency cash flow hedges (a) (7) (6) (13) (12) Gain (loss) on interest rate fair value hedges (b) (76) (3) (198) (12) Total other income (expense), net 139 101 283 160 Gain (loss) on foreign currency cash flow hedges (a)(c) (73) 17 (97) (43) Gain (loss) on foreign currency fair value hedges (96) — (121) — Amount excluded from effectiveness testing recognized in earnings 7 — 3 — Southern Power Total depreciation and amortization $ 131 $ 132 $ 251 $ 251 Gain (loss) on energy-related cash flow hedges (a) 4 1 6 4 Total interest expense, net of amounts capitalized (36) (37) (73) (75) Gain (loss) on foreign currency cash flow hedges (a) (7) (6) (13) (12) Total other income (expense), net 1 1 3 8 Gain (loss) on foreign currency cash flow hedges (a)(c) (73) 17 (97) (43) Southern Company Gas Total cost of natural gas $ 452 $ 231 $ 1,546 $ 814 Gain (loss) on energy-related cash flow hedges (a) 10 — 18 (2) Total interest expense, net of amounts capitalized (61) (59) (122) (118) Gain (loss) on interest rate cash flow hedges (a) (1) (1) (1) (1) Gain (loss) on interest rate fair value hedges (b) (22) 4 (57) 4 (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, 2022 and December 31, 2021, 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, 2022 At December 31, 2021 At June 30, 2022 At December 31, 2021 (in millions) (in millions) Southern Company Long-term debt $ (2,981) $ (3,280) $ 192 $ 9 Southern Company Gas Long-term debt $ (437) $ (493) $ 59 $ 2
Schedule of Pre-tax Effect of Interest Rate and Energy Related Derivatives on Income	For the three and six months ended June 30, 2022 and 2021, 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 2022 2021 2022 2021 (in millions) (in millions) Energy-related derivatives: Natural gas revenues () $ (15) $ (103) $ (13) $ (120) Cost of natural gas (25) 9 (5) 16 Total derivatives in non-designated hedging relationships $ (40) $ (94) $ (18) $ (104) () Excludes immaterial gains (losses) recorded in natural gas revenues associated with weather derivatives for all periods presented.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	6 Months Ended
Acquisitions and Dispositions (Tables)	Jun. 30, 2022
Business Combination and Asset Acquisition [Abstract]
Schedule of Construction Projects	Project Facility Resource Approximate Nameplate Capacity ( MW ) Location COD PPA Contract Period Projects Completed During the Six Months Ended June 30, 2022 Garland Solar Storage (a) Battery energy storage system 88 Kern County, CA September 2021 through February 2022 (b) 20 years Tranquillity Solar Storage (a) Battery energy storage system 72 Fresno County, CA November 2021 through March 2022 (c) 20 years (a) Southern Power consolidates each project's operating results in its financial statements and the tax equity partner and two other partners each own a noncontrolling interest. (b) The facility has a total capacity of 88 MWs, of which 73 MWs were placed in service in 2021 and 15 MWs were placed in service in February 2022. (c) The facility has a total capacity of 72 MWs, of which 32 MWs were placed in service in 2021 and 40 MWs were placed in service in March 2022.

Segment and Related Informati_2

Segment and Related Information (Tables)	6 Months Ended
Segment and Related Information (Tables)	Jun. 30, 2022
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, 2022 and 2021 was as follows: Electric Utilities Traditional Southern Eliminations Total Southern Company Gas All Eliminations Consolidated (in millions) 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)(b) 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)(b) 1,811 170 — 1,981 433 (263) (12) 2,139 At June 30, 2022 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 263 $ — $ 5,280 Total assets 92,742 13,402 (787) 105,357 23,618 2,457 (663) 130,769 Three Months Ended June 30, 2021 Operating revenues $ 4,031 $ 490 $ (114) $ 4,407 $ 677 $ 154 $ (40) $ 5,198 Segment net income (loss) (a)(b)(c) 511 36 — 547 (65) (108) (2) 372 Six Months Ended June 30, 2021 Operating revenues $ 7,795 $ 930 $ (201) $ 8,524 $ 2,371 $ 288 $ (75) $ 11,108 Segment net income (loss) (a)(b)(c)(d) 1,267 133 — 1,400 333 (216) (9) 1,508 At December 31, 2021 Goodwill $ — $ 2 $ — $ 2 $ 5,015 $ 263 $ — $ 5,280 Total assets 89,051 13,390 (667) 101,774 23,560 2,975 (775) 127,534 (a) Attributable to Southern Company. (b) For the traditional electric operating companies, includes pre-tax charges at Georgia Power for estimated losses associated with the construction of Plant Vogtle Units 3 and 4 of $52 million ($39 million after tax) for the three and six months ended June 30, 2022 and $460 million ($343 million after tax) and $508 million ($379 million after tax) for the three and six months ended June 30, 2021, respectively. 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. (c) For Southern Company Gas, includes a pre-tax impairment charge of $82 million ($58 million after tax) related to its equity method investment in the PennEast Pipeline project. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information. (d) For Southern Power, includes gains on wind turbine equipment contributed to various equity method investments totaling approximately $37 million pre-tax ($28 million after tax). See Note 15 to the financial statements under "Southern Power – Development Projects" in Item 8 of the Form 10-K for additional information. Business segment financial data for the three and six months ended June 30, 2022 and 2021 was as follows: Gas Distribution Operations Gas Pipeline Investments Wholesale Gas Services (a) Gas Marketing Services Total All Other Eliminations Consolidated (in millions) 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 (loss) 306 52 — 67 425 8 — 433 Total assets at June 30, 2022 21,183 1,433 — 1,554 24,170 11,999 (12,551) 23,618 Three Months Ended June 30, 2021 Operating revenues $ 710 $ 8 $ (110) $ 64 $ 672 $ 11 $ (6) $ 677 Segment net income (loss) (b) 80 (36) (112) 6 (62) (3) — (65) Six Months Ended June 30, 2021 Operating revenues $ 1,910 $ 16 $ 188 $ 259 $ 2,373 $ 18 $ (20) $ 2,371 Segment net income (loss) (b) 263 (7) 14 62 332 1 — 333 Total assets at December 31, 2021 20,917 1,467 31 1,556 23,971 12,114 (12,525) 23,560 (a) As a result of the sale of Sequent, wholesale gas services is no longer a reportable segment for the three and six months ended June 30, 2022. Prior to the sale of Sequent, the revenues for wholesale gas services were netted with costs associated with its energy and risk management activities. A reconciliation of operating revenues and intercompany revenues is shown in the following table. Third Party Gross Revenues Intercompany Revenues Total Gross Revenues Less Gross Gas Costs Operating Revenues (in millions) Three Months Ended June 30, 2021 $ 1,292 $ 27 $ 1,319 $ 1,429 $ (110) Six Months Ended June 30, 2021 3,881 90 3,971 3,783 188 (b) For gas pipeline investments, includes a pre-tax impairment charge of $82 million ($58 million after tax) related to the equity method investment in the PennEast Pipeline project. See Note 7 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K 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, 2022 $ 4,789 $ 937 $ 280 $ 6,006 Three Months Ended June 30, 2021 3,599 546 262 4,407 Six Months Ended June 30, 2022 $ 8,402 $ 1,601 $ 513 $ 10,516 Six Months Ended June 30, 2021 6,941 1,091 492 8,524 Southern Company Gas' Revenues Gas Wholesale Gas Services () Gas Other Total (in millions) Three Months Ended June 30, 2022 $ 975 $ — $ 92 $ 16 $ 1,083 Three Months Ended June 30, 2021 706 (110) 64 17 677 Six Months Ended June 30, 2022 $ 2,765 $ — $ 335 $ 40 $ 3,140 Six Months Ended June 30, 2021 1,898 188 259 26 2,371 () Prior to the sale of Sequent, the revenues for wholesale gas services were netted with costs associated with its energy and risk management activities. See "Southern Company Gas" herein and Note 15 to the financial statements under "Southern Company Gas" in Item 8 of the Form 10-K for additional information.

Introduction - Schedule of Good

Introduction - Schedule of Goodwill (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill	$ 5,280	$ 5,280
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, 2022	Dec. 31, 2021
Other intangible assets subject to amortization:
Gross Carrying Amount	$ 676	$ 677
Accumulated Amortization	(326)	(307)
Other Intangible Assets, Net	350	370
Other intangible assets not subject to amortization:
Federal Communications Commission licenses	75	75
Total other intangible assets
Gross Carrying Amount	751	752
Accumulated Amortization	(326)	(307)
Other Intangible Assets, Net	425	445
Customer relationships
Other intangible assets subject to amortization:
Gross Carrying Amount	212	212
Accumulated Amortization	(157)	(150)
Other Intangible Assets, Net	55	62
Total other intangible assets
Accumulated Amortization	(157)	(150)
Trade names
Other intangible assets subject to amortization:
Gross Carrying Amount	64	64
Accumulated Amortization	(41)	(38)
Other Intangible Assets, Net	23	26
Total other intangible assets
Accumulated Amortization	(41)	(38)
PPA fair value adjustments
Other intangible assets subject to amortization:
Gross Carrying Amount	390	390
Accumulated Amortization	(119)	(109)
Other Intangible Assets, Net	271	281
Total other intangible assets
Accumulated Amortization	(119)	(109)
Other
Other intangible assets subject to amortization:
Gross Carrying Amount	10	11
Accumulated Amortization	(9)	(10)
Other Intangible Assets, Net	1	1
Total other intangible assets
Accumulated Amortization	(9)	(10)
SOUTHERN POWER CO
Other intangible assets subject to amortization:
Accumulated Amortization	(119)	(109)
Total other intangible assets
Accumulated Amortization	(119)	(109)
SOUTHERN POWER CO \| PPA fair value adjustments
Other intangible assets subject to amortization:
Gross Carrying Amount	390	390
Accumulated Amortization	(119)	(109)
Other Intangible Assets, Net	271	281
Total other intangible assets
Accumulated Amortization	(119)	(109)
SOUTHERN Co GAS
Other intangible assets subject to amortization:
Gross Carrying Amount	182	182
Accumulated Amortization	(151)	(145)
Other Intangible Assets, Net	31	37
Total other intangible assets
Accumulated Amortization	(151)	(145)
Other Intangible Assets, Net	31	37
SOUTHERN Co GAS \| Customer relationships
Other intangible assets subject to amortization:
Gross Carrying Amount	156	156
Accumulated Amortization	(135)	(130)
Other Intangible Assets, Net	21	26
Total other intangible assets
Accumulated Amortization	(135)	(130)
SOUTHERN Co GAS \| Trade names
Other intangible assets subject to amortization:
Gross Carrying Amount	26	26
Accumulated Amortization	(16)	(15)
Other Intangible Assets, Net	10	11
Total other intangible assets
Accumulated Amortization	$ (16)	$ (15)

Introduction - Schedule of Amor

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

Introduction - Schedule of Cash

Introduction - Schedule of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 1,724	$ 1,798
Restricted cash:
Total cash, cash equivalents, and restricted cash	1,735	1,829	$ 1,617	$ 1,068
Other current assets
Restricted cash:
Restricted cash	2	2
Other deferred charges and assets
Restricted cash:
Restricted cash	9	29
SOUTHERN POWER CO
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	202	107
Restricted cash:
Total cash, cash equivalents, and restricted cash	211	135	189	183
SOUTHERN POWER CO \| Other current assets
Restricted cash:
Restricted cash	0	0
SOUTHERN POWER CO \| Other deferred charges and assets
Restricted cash:
Restricted cash	9	29
SOUTHERN POWER CO \| Tax Equity Contributions \| Garland
Restricted cash:
Restricted cash		19
SOUTHERN POWER CO \| Estimated Construction Completion Costs \| Deuel Harvest
Restricted cash:
Restricted cash	9	10
SOUTHERN Co GAS
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	217	45
Restricted cash:
Total cash, cash equivalents, and restricted cash	218	48	$ 48	$ 19
SOUTHERN Co GAS \| Other current assets
Restricted cash:
Restricted cash	2	2
SOUTHERN Co GAS \| Other deferred charges and assets
Restricted cash:
Restricted cash	$ 0	$ 0

Introduction - Depreciation and

Introduction - Depreciation and Amortization (Details)		12 Months Ended
Introduction - Depreciation and Amortization (Details)	Jan. 01, 2022	Dec. 31, 2021
Maximum \| Wind Generating Facility \| SOUTHERN POWER CO
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	35 years	30 years

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Cost Recovery Clauses (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Natural gas cost under recovery	$ 361	$ 266
ALABAMA POWER CO \| Other regulatory assets, deferred
Loss Contingencies [Line Items]
Rate CNP Compliance	29	16
Rate CNP PPA	93	84
Retail Energy Cost Recovery	191	126
ALABAMA POWER CO \| Other regulatory assets, current
Loss Contingencies [Line Items]
Retail Energy Cost Recovery	60	0
GEORGIA POWER CO \| Other deferred charges and assets
Loss Contingencies [Line Items]
Fuel Cost Recovery	948	410
MISSISSIPPI POWER CO \| Other regulatory assets, deferred
Loss Contingencies [Line Items]
Ad Valorem Tax	29	37
MISSISSIPPI POWER CO \| Other customer accounts receivable
Loss Contingencies [Line Items]
Fuel Cost Recovery	29	4
MISSISSIPPI POWER CO \| Other regulatory assets, current
Loss Contingencies [Line Items]
Ad Valorem Tax	12	12
SOUTHERN Co GAS
Loss Contingencies [Line Items]
Natural gas cost under recovery	361	266
SOUTHERN Co GAS \| Other regulatory assets, deferred
Loss Contingencies [Line Items]
Natural gas cost under recovery	15	207
SOUTHERN Co GAS \| Other regulatory assets, current
Loss Contingencies [Line Items]
Natural gas cost under recovery	$ 361	$ 266

Regulatory Matters - APC Rate E

Regulatory Matters - APC Rate ECR (Details) - Alabama Power $ in Millions			1 Months Ended
	Jul. 12, 2022 USD ($) $ / KWH_Kilowatt_hour	Jul. 11, 2022 $ / KWH_Kilowatt_hour	Jan. 31, 2025 $ / KWH_Kilowatt_hour
Subsequent Event
Schedule of Regulatory Assets and Liabilities [Line Items]
Current billing rates under rate ECR (usd per KWH)	2.557	1.96
Current billing rates under rate ECR, amount \| $	$ 310
Scenario, Forecast
Schedule of Regulatory Assets and Liabilities [Line Items]
Current billing rates under rate ECR (usd per KWH)			5.91

Regulatory Matters - APC Rate N

Regulatory Matters - APC Rate NDR and Reliability Reserve Accounting Order (Details) - Alabama Power - USD ($)		6 Months Ended	12 Months Ended
	Jul. 12, 2022	Dec. 31, 2022	Dec. 31, 2023	Jun. 30, 2022
Public Utilities, General Disclosures [Line Items]
Natural disaster reserve balance				$ 103,000,000
Natural disaster reserve authorized limit				75,000,000
Minimum natural disaster reserve balance, triggering establishment charge				$ 50,000,000
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Maximum rate NDR charge per month, monthly nonresidential customer account	$ 5
Maximum rate NDR charge per month, monthly residential customer account	2.50
Natural disaster reserve authorized limit	$ 35,000,000
Minimum \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Maximum period for recovery deferred stock related operations and maintenance costs and any future reserve deficits	24 months
Maximum \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Maximum period for recovery deferred stock related operations and maintenance costs and any future reserve deficits	48 months
Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Natural disaster reserve, expected recovery amount		$ 6,000,000	$ 12,000,000

Regulatory Matters - APC Renewa

Regulatory Matters - APC Renewable Generation Certificate (Details) - ALABAMA POWER CO	1 Months Ended
	Apr. 30, 2022 project MW	Jun. 30, 2022 MW
Public Utilities, General Disclosures [Line Items]
Renewable generation certificate, authorized generating capacity (in MWs)		500
Renewable generation certificate, number of projects terminated \| project	1
Renewable generation certificate, capacity restored (in MWs)	80

Regulatory Matters - GPC Base R

Regulatory Matters - GPC Base Rate Case (Details) $ in Millions	Jun. 24, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Proposed alternate rate plan	3 years
GEORGIA POWER CO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	$ 852
Requested rate increase (decrease), amount, due in 2024	107
Requested rate increase (decrease), amount, due in 2025	$ 45
Base rate case filing, measurement input, return on investment	11%
Base rate case filing, measurement input, maximum equity ratio	56%
Portion of actual earnings above approved ROE band refunded to customers	80%
Portion of actual earnings above approved ROE band retained by subsidiary company	20%
GEORGIA POWER CO \| Minimum
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity	9.50%
GEORGIA POWER CO \| Maximum
Public Utilities, General Disclosures [Line Items]
Retail rate of return on common equity	12%

Regulatory Matters - GPC Tariff

Regulatory Matters - GPC Tariffs (Details) - GEORGIA POWER CO $ in Millions	Jun. 24, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	$ 852
Requested rate increase (decrease), amount, due in 2024	107
Requested rate increase (decrease), amount, due in 2025	45
Traditional base
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	739
Requested rate increase (decrease), amount, due in 2024	0
Requested rate increase (decrease), amount, due in 2025	0
Traditional
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	(1)
Requested rate increase (decrease), amount, due in 2024	0
Requested rate increase (decrease), amount, due in 2025	0
CCR ARO
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	64
Requested rate increase (decrease), amount, due in 2024	78
Requested rate increase (decrease), amount, due in 2025	47
DSM
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	30
Requested rate increase (decrease), amount, due in 2024	27
Requested rate increase (decrease), amount, due in 2025	(2)
Municipal Franchise Fee
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount, due in next fiscal year	20
Requested rate increase (decrease), amount, due in 2024	2
Requested rate increase (decrease), amount, due in 2025	$ 1

Regulatory Matters - GPC Integr

Regulatory Matters - GPC Integrated Resource Plan (Details) - GEORGIA POWER CO $ in Millions					6 Months Ended	12 Months Ended
	Jan. 01, 2028 MW	Jan. 01, 2025 MW	Jan. 01, 2024 MW	Jul. 21, 2022 agreement ashPond MW	Jun. 30, 2022 USD ($) MW	Dec. 31, 2026 MW
Public Utilities, General Disclosures [Line Items]
Approved capacity increase (in MWs)					970
Subsequent Event
Public Utilities, General Disclosures [Line Items]
Approved change in closure method, number of ash ponds \| ashPond				1
Number of approved Power Purchase Agreements \| agreement				6
Number of approved Approved Power Purchase Agreements \| agreement				5
Subsequent Event \| Scenario, Forecast
Public Utilities, General Disclosures [Line Items]
Approved capacity increase (in MWs)	228	380	1,567			265
Rejected additional generating capacity				88
Subsequent Event \| Scenario, Forecast \| Renewable Resources
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity				2,300
Subsequent Event \| Scenario, Forecast \| Energy Storage
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity				500
Subsequent Event \| Scenario, Forecast \| Biomass Generation
Public Utilities, General Disclosures [Line Items]
Requested additional generating capacity				140
Plant Wansley Units 1 and 2 \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity of units approved for decertification and retirement of units				926
Approved amounts for decertification and retirement of units, percentage				53.50%
Plant Wansley Unit 1
Public Utilities, General Disclosures [Line Items]
Remaining net book value \| $					$ 302
Plant Wansley Unit 2
Public Utilities, General Disclosures [Line Items]
Remaining net book value \| $					279
Plant Scherer Unit 3
Public Utilities, General Disclosures [Line Items]
Remaining net book value \| $					$ 614
Plant Scherer Unit 3 \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity of units approved for decertification and retirement of units				614
Approved amounts for decertification and retirement of units, percentage				75%
Plant Gaston Units 1 through 4 \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity of units approved for decertification and retirement of units				500
Approved amounts for decertification and retirement of units, percentage				50%
Plant Bowen Units 1 and 2 \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Capacity of units included in request for decertification of units				1,400

Regulatory Matters - GPC Nuclea

Regulatory Matters - GPC Nuclear Construction (Details) - GEORGIA POWER CO $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2012 utility MW	Aug. 31, 2018
Loss Contingencies [Line Items]
Estimated cost to complete, pre-tax charge to income	$ 36
Estimated cost to complete, pre-tax charge to income, net of tax	$ 27
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Proportionate ownership share	45.70%	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	$ 3,400	$ 3,400
Estimated cost to complete, construction contingency estimate, financing costs, incurred to date	3,000	3,000
Construction contingency estimate	126	126
Estimated cost to complete, additional construction contingency estimate	36	36
Base project capital cost forecast, monthly		35
Monthly AFUDC		$ 45
Percentage of ownership interest required for voting for continuing construction				90%
Plant Vogtle Units 3 And 4 \| Vogtle Owners
Loss Contingencies [Line Items]
Period of notice required in the event letters of credit are not renewed		30 days
Minimum \| Plant Vogtle Units 3 And 4 \| COVID-19
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss, loss of productivity, term		3 months
Estimate of possible loss	160	$ 160
Maximum \| Plant Vogtle Units 3 And 4 \| COVID-19
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss, loss of productivity, term		4 months
Estimate of possible loss	$ 200	$ 200

Regulatory Matters - GPC Nucl_2

Regulatory Matters - GPC Nuclear Construction Cost and Schedule (Details) - GEORGIA POWER CO - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Loss Contingencies [Line Items]
Pre-tax charge to income	$ 16	$ 440	$ 455
Plant Vogtle Units 3 And 4
Loss Contingencies [Line Items]
Base project capital cost forecast	10,393		10,393
Construction contingency estimate	60		60
Total project capital cost forecast	10,453		10,453
Net investment as of end of the period	(8,966)		(8,966)
Remaining estimate to complete	1,487		1,487
Estimated cost to complete, costs not shared with other owners	590		590
Expected capitalized costs			385
Capitalized interest accrued	$ 247		$ 247
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) - GEORGIA POWER CO - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 11, 2018	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2022	Jul. 25, 2022	Jun. 18, 2022	Aug. 31, 2018
Public Utilities, General Disclosures [Line Items]
Pre-tax charge to income		$ 16,000	$ 440,000	$ 455,000
After tax charge to income		12,000	$ 328,000
Plant Vogtle Units 3 And 4
Public Utilities, General Disclosures [Line Items]
Production tax credits, aggregate purchase price, maximum				300,000
Preliminary estimated cost to complete		$ 10,453,000		10,453,000
Additional construction capital costs	$ 3,300,000			$ 480,000
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
Proportionate ownership share		45.70%		45.70%
Plant Vogtle Units 3 And 4 \| Vogtle Owners
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs				$ 100
Plant Vogtle Units 3 And 4 \| Vogtle Owners \| Tender Provision Dispute
Public Utilities, General Disclosures [Line Items]
Estimated cost to complete, starting dollar amount						$ 17,100,000
Plant Vogtle Units 3 And 4 \| Vogtle Owners \| Counterclaim Seeking Declaratory Judgement \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Estimated cost to complete, starting dollar amount					$ 18,380,000
Plant Vogtle Units 3 And 4 \| Minimum
Public Utilities, General Disclosures [Line Items]
Global amendments, tender provision, decision period after tender option triggered				120 days
Plant Vogtle Units 3 And 4 \| Maximum
Public Utilities, General Disclosures [Line Items]
Global amendments, tender provision, decision period after tender option triggered				194 days
Plant Vogtle Units 3 And 4 \| Category I
Public Utilities, General Disclosures [Line Items]
Preliminary estimated cost to complete		$ 8,400,000		$ 8,400,000
Additional construction capital costs, threshold				$ 800,000
Plant Vogtle Units 3 And 4 \| Category II
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay				55.70%
Additional construction capital costs				$ 80,000
Plant Vogtle Units 3 And 4 \| 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 \| Category II \| Minimum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold				$ 800,000
Plant Vogtle Units 3 And 4 \| Category II \| Maximum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold				$ 1,600,000
Plant Vogtle Units 3 And 4 \| Category III
Public Utilities, General Disclosures [Line Items]
Percentage of construction costs, responsibility to pay				65.70%
Additional construction capital costs				$ 100,000
Plant Vogtle Units 3 And 4 \| 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 \| Category III \| Minimum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold				$ 1,600,000
Plant Vogtle Units 3 And 4 \| Category III \| Maximum
Public Utilities, General Disclosures [Line Items]
Additional construction capital costs, threshold				$ 2,100,000

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

Jan. 01, 2022 USD ($)

Jan. 01, 2021

Jan. 01, 2020

Jan. 11, 2018 USD ($)

Jan. 01, 2016

Jun. 30, 2022 USD ($)

Jun. 30, 2021 USD ($) report

Dec. 31, 2023 USD ($)

Dec. 31, 2022 USD ($)

Dec. 31, 2021 USD ($)

Dec. 31, 2009 USD ($)

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

$ 2,800

Requested decrease in tariff

$ 78

Additional construction capital costs

$ 3,300

$ 480

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

$ 270

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

$ 584

Twenty Seventh Vogtle Construction Monitoring Report

Public Utilities, General Disclosures [Line Items]

Requested capital construction costs

$ 522

Scenario, Forecast

Public Utilities, General Disclosures [Line Items]

Return on equity reduction, negative impact on earnings

$ 250

$ 300

Regulatory Matters - MPC (Detai

Regulatory Matters - MPC (Details) - MISSISSIPPI POWER CO $ in Millions	Jul. 15, 2022 USD ($)	Jun. 07, 2022 USD ($)	Jun. 30, 2022 MW	May 26, 2022
Performance Evaluation Plan
Loss Contingencies [Line Items]
Approved rate increase (decrease)		$ 18
Approved rate increase, percentage		1.90%
Ad Valorem Tax Adjustment
Loss Contingencies [Line Items]
Approved rate increase (decrease)		$ 5
Subsequent Event \| Municipal and Rural Associations Tariff
Loss Contingencies [Line Items]
Requested rate increase (decrease) amount	$ 23
Cooperative Energy
Loss Contingencies [Line Items]
Counterparty's option to decrease services, percentage				2.50%
Counterparty's electricity requirement at MRA delivery points				100%
Power being supplied to counterparty \| MW			400

Regulatory Matters - GAS Schedu

Regulatory Matters - GAS Schedule of Infrastructure Replacement Programs and Capital Projects (Details) - SOUTHERN Co GAS $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Public Utilities, General Disclosures [Line Items]
Capital expenditures	$ 240
Investing in Illinois
Public Utilities, General Disclosures [Line Items]
Capital expenditures	177
Steps to Advance Virginia's Energy
Public Utilities, General Disclosures [Line Items]
Capital expenditures	33
System Reinforcement Rider
Public Utilities, General Disclosures [Line Items]
Capital expenditures	28
Pipeline Replacement Program
Public Utilities, General Disclosures [Line Items]
Capital expenditures	$ 2

Regulatory Matters - GAS Atlant

Regulatory Matters - GAS Atlanta Gas Light (Details) $ in Millions	Jul. 01, 2022 USD ($)
SOUTHERN Co GAS \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease) amount	$ 53

Contingencies - General Litigat

Contingencies - General Litigation Matters (Details) $ in Millions			1 Months Ended		12 Months Ended
	Jun. 09, 2022 USD ($)	Feb. 07, 2022 claim	Oct. 31, 2021 claim	Mar. 31, 2019 plaintiff	Dec. 31, 2018 USD ($) plaintiff defendant	Mar. 09, 2022 claim	Dec. 31, 2017 claim
Pending Litigation \| Shareholder Derivative Lawsuits
Loss Contingencies [Line Items]
Pending number of claims							2
Settled Litigation \| Shareholder Derivative Lawsuits
Loss Contingencies [Line Items]
Settlement expense \| $	$ 4.5
GEORGIA POWER CO \| Pending Litigation \| Class Action Lawsuit
Loss Contingencies [Line Items]
Pending number of claims						4
Complaints filed		4	3
MISSISSIPPI POWER CO \| Pending Litigation \| Purported Violations of Mississippi Consumer Protection Act
Loss Contingencies [Line Items]
Number of plaintiffs \| plaintiff					10
Number of defendants \| defendant					3
Number of additional plaintiffs \| plaintiff				4
Underpayment of refunds \| $					$ 23.5

Contingencies - Environmental R

Contingencies - Environmental Remediation (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
GEORGIA POWER CO
Loss Contingencies [Line Items]
Environmental remediation liability, current and former sites	$ 16	$ 17
SOUTHERN Co GAS
Loss Contingencies [Line Items]
Environmental remediation liability, current and former sites	$ 241	$ 249

Contingencies - Other Matters (

Contingencies - Other Matters (Details)		12 Months Ended	60 Months Ended
Contingencies - Other Matters (Details)	Jul. 12, 2022 USD ($) claim	Dec. 31, 2019 USD ($)	Jan. 15, 2024 USD ($)
Plant Daniel Unit, Primary \| MISSISSIPPI POWER CO \| Subsequent Event
Loss Contingencies [Line Items]
Plant units \| claim	1
Plant Daniel Units 1 And 2 \| GULF POWER CO \| Subsequent Event
Loss Contingencies [Line Items]
Percent ownership in individual unit	100%
Plant Daniel Units 1 And 2 \| MISSISSIPPI POWER CO \| Subsequent Event
Loss Contingencies [Line Items]
Plant units \| claim	2
Scenario, Forecast \| Plant Daniel Units 1 And 2 \| MISSISSIPPI POWER CO
Loss Contingencies [Line Items]
Payments to acquire businesses			$ 1
Business combination, option to purchase, period			120 days
Disposal Group, Disposed of by Sale \| GULF POWER CO
Loss Contingencies [Line Items]
Proceeds from divestiture of businesses, amount held back		$ 75,000,000
Disposal Group, Disposed of by Sale \| GULF POWER CO \| Subsequent Event
Loss Contingencies [Line Items]
Proceeds from divestiture of businesses, amount held back	$ 75,000,000

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 6,226	$ 5,422	$ 12,486	$ 12,319
Total operating revenues	7,206	5,198	13,854	11,108
Retail electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	4,789	3,599	8,402	6,941
Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,072	3,396	7,529	6,674
Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,655	1,469	3,179	2,936
Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,387	1,176	2,567	2,294
Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,005	728	1,732	1,397
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	25	23	51	47
Natural Gas
Disaggregation of Revenue [Line Items]
Total operating revenues	1,083	677	3,140	2,371
Natural gas distribution revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	963	698	2,746	1,883
Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	474	311	1,490	925
Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	130	73	400	243
Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	276	247	613	536
Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16	8	48	24
Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	67	59	195	155
Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	100	651	359	2,442
Wholesale gas services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		578		2,168
Gas marketing services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	90	63	333	257
Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	10	10	26	17
Other revenue sources
Disaggregation of Revenue [Line Items]
Other revenues	980	1,179	1,368	2,488
Other adjustments
Disaggregation of Revenue [Line Items]
Other revenues		(1,403)		(3,699)
Wholesale Electric
Disaggregation of Revenue [Line Items]
Total operating revenues	937	546	1,601	1,091
Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	783	382	1,322	778
PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	585	209	930	422
PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	136	118	268	237
Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	62	55	124	119
Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	308	295	530	542
ALABAMA POWER CO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,644	1,421	3,188	2,895
Total operating revenues	1,931	1,556	3,580	3,115
ALABAMA POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	1,629	1,354	3,008	2,706
ALABAMA POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,398	1,277	2,734	2,602
ALABAMA POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	617	553	1,250	1,181
ALABAMA POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	410	386	786	758
ALABAMA POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	368	334	691	654
ALABAMA POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3	4	7	9
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 \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ALABAMA POWER CO \| Wholesale gas services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		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	287	135	392	220
ALABAMA POWER CO \| Other adjustments
Disaggregation of Revenue [Line Items]
Other revenues		0		0
ALABAMA POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	183	92	345	196
ALABAMA POWER CO \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	108	38	168	81
ALABAMA POWER CO \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	40	29	78	58
ALABAMA POWER CO \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	35	25	99	57
ALABAMA POWER CO \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	63	52	109	97
GEORGIA POWER CO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,614	2,084	4,674	3,995
Total operating revenues	3,121	2,225	5,328	4,195
GEORGIA POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	2,908	2,026	4,926	3,813
GEORGIA POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,435	1,914	4,348	3,677
GEORGIA POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	962	852	1,783	1,627
GEORGIA POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	900	724	1,638	1,410
GEORGIA POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	553	321	887	606
GEORGIA POWER CO \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	20	17	40	34
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 \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
GEORGIA POWER CO \| Wholesale gas services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		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	507	141	654	200
GEORGIA POWER CO \| Other adjustments
Disaggregation of Revenue [Line Items]
Other revenues		0		0
GEORGIA POWER CO \| Wholesale Electric
Disaggregation of Revenue [Line Items]
Total operating revenues	64	36	130	80
GEORGIA POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	58	33	110	69
GEORGIA POWER CO \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	40	16	72	30
GEORGIA POWER CO \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	12	14	23	27
GEORGIA POWER CO \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	6	3	15	12
GEORGIA POWER CO \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	121	137	216	249
MISSISSIPPI POWER CO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	422	290	746	582
Total operating revenues	434	303	769	610
MISSISSIPPI POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	252	219	469	422
MISSISSIPPI POWER CO \| Retail electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	239	205	447	395
MISSISSIPPI POWER CO \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	76	64	146	128
MISSISSIPPI POWER CO \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	77	66	143	126
MISSISSIPPI POWER CO \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	84	73	154	137
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 \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
MISSISSIPPI POWER CO \| Wholesale gas services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		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	12	13	23	28
MISSISSIPPI POWER CO \| Other adjustments
Disaggregation of Revenue [Line Items]
Other revenues		0		0
MISSISSIPPI POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	174	78	282	173
MISSISSIPPI POWER CO \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	5	2	8	7
MISSISSIPPI POWER CO \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	1	3	4
MISSISSIPPI POWER CO \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	169	75	271	162
MISSISSIPPI POWER CO \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	9	7	17	14
SOUTHERN POWER CO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	731	316	1,146	611
Total operating revenues	899	490	1,438	930
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 \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
SOUTHERN POWER CO \| Wholesale gas services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		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	168	174	292	319
SOUTHERN POWER CO \| Other adjustments
Disaggregation of Revenue [Line Items]
Other revenues		0		0
SOUTHERN POWER CO \| Wholesale electric revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	722	311	1,129	602
SOUTHERN POWER CO \| PPA energy revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	441	158	694	313
SOUTHERN POWER CO \| PPA capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	85	75	166	150
SOUTHERN POWER CO \| Non-PPA revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	196	78	269	139
SOUTHERN POWER CO \| Other revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	9	5	17	9
SOUTHERN Co GAS
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,063	1,349	3,105	4,325
Total operating revenues	1,083	677	3,140	2,371
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	963	698	2,746	1,883
SOUTHERN Co GAS \| Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	474	311	1,490	925
SOUTHERN Co GAS \| Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	130	73	400	243
SOUTHERN Co GAS \| Transportation
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	276	247	613	536
SOUTHERN Co GAS \| Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16	8	48	24
SOUTHERN Co GAS \| Other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	67	59	195	155
SOUTHERN Co GAS \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	100	651	359	2,442
SOUTHERN Co GAS \| Wholesale gas services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		578		2,168
SOUTHERN Co GAS \| Gas marketing services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	90	63	333	257
SOUTHERN Co GAS \| Other natural gas revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	10	10	26	17
SOUTHERN Co GAS \| Other revenue sources
Disaggregation of Revenue [Line Items]
Other revenues	20	731	35	1,745
SOUTHERN Co GAS \| Other adjustments
Disaggregation of Revenue [Line Items]
Other revenues		(1,403)		(3,699)
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 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, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Accounts Receivable	$ 3,021	$ 2,504
Contract Assets	102	117
Contract Liabilities	70	57
ALABAMA POWER CO
Disaggregation of Revenue [Line Items]
Accounts Receivable	773	589
Contract Assets	0	2
Contract Liabilities	3	4
GEORGIA POWER CO
Disaggregation of Revenue [Line Items]
Accounts Receivable	1,217	736
Contract Assets	38	63
Contract Liabilities	25	14
MISSISSIPPI POWER CO
Disaggregation of Revenue [Line Items]
Accounts Receivable	95	73
Contract Assets	0	0
Contract Liabilities	4	0
SOUTHERN POWER CO
Disaggregation of Revenue [Line Items]
Accounts Receivable	278	149
Contract Assets	0	1
Contract Liabilities	1	1
SOUTHERN Co GAS
Disaggregation of Revenue [Line Items]
Accounts Receivable	504	753
Contract Assets	0	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, 2022	Jun. 30, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Contract assets	$ 102	$ 102	$ 117
Contract liabilities	70	70	57
Revenue from contracts with customers recognized	10	19
Unregulated Distributed Generation
Disaggregation of Revenue [Line Items]
Contract assets	63	63	50
Contract liabilities	$ 38	$ 38	$ 39

Revenue from Contracts with C_6

Revenue from Contracts with Customers and Lease Income - Schedule of Remaining Performance Obligations (Details) $ in Millions	Jun. 30, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 347
Performance obligation, expected timing of satisfaction	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 617
Performance obligation, expected timing of satisfaction	1 year
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	$ 414
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	$ 322
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	$ 307
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	$ 2,340
Performance obligation, expected timing of satisfaction
ALABAMA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 15
Performance obligation, expected timing of satisfaction	6 months
ALABAMA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 24
Performance obligation, expected timing of satisfaction	1 year
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	$ 7
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	$ 5
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
GEORGIA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 39
Performance obligation, expected timing of satisfaction	6 months
GEORGIA POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 63
Performance obligation, expected timing of satisfaction	1 year
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	$ 30
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	$ 22
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	$ 11
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	$ 21
Performance obligation, expected timing of satisfaction
SOUTHERN POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 184
Performance obligation, expected timing of satisfaction	6 months
SOUTHERN POWER CO \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 347
Performance obligation, expected timing of satisfaction	1 year
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	$ 344
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	$ 294
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	$ 299
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	$ 2,334
Performance obligation, expected timing of satisfaction
SOUTHERN Co GAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 16
Performance obligation, expected timing of satisfaction	6 months
SOUTHERN Co GAS \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
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]: 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

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	$ 7	$ 4	$ 13	$ 7
Lease income - operating leases	52	56	105	112
Variable lease income	129	128	211	212
Total lease income	188	188	329	331
ALABAMA POWER CO
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	0	0	0	0
Lease income - operating leases	19	21	39	41
Variable lease income	0	(1)	0	0
Total lease income	19	20	39	41
GEORGIA POWER CO
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	0	0	0	0
Lease income - operating leases	8	10	16	21
Variable lease income	0	0	0	0
Total lease income	8	10	16	21
MISSISSIPPI POWER CO
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	4	4	8	7
Lease income - operating leases	0	0	1	1
Variable lease income	0	0	0	0
Total lease income	4	4	9	8
SOUTHERN POWER CO
Lessor, Lease, Description [Line Items]
Lease income - interest income on sales-type leases	3	0	5	0
Lease income - operating leases	21	21	42	42
Variable lease income	138	138	227	228
Total lease income	162	159	274	270
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	17
Variable lease income	0	0	0	0
Total lease income	$ 9	$ 9	$ 18	$ 17

Consolidated Entities and Equ_3

Consolidated Entities and Equity Method Investments - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) investor	Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Assets	$ 130,769	$ 127,534
Liabilities	97,514	94,967
Equity investments in unconsolidated subsidiaries	1,305	1,282
SOUTHERN POWER CO
Schedule of Equity Method Investments [Line Items]
Assets	13,402	13,390
Liabilities	6,523	6,792
Equity investments in unconsolidated subsidiaries	49	86
Proceeds from sale of equity method investments	$ 38
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	$ 6,000	6,100
Liabilities	386	408
Noncontrolling interests related to other partners' interests	1,100	1,100
Variable Interest Entity, Primary Beneficiary \| SP Wind \| SOUTHERN POWER CO
Schedule of Equity Method Investments [Line Items]
Assets	2,300	2,300
Liabilities	212	130
Noncontrolling interests related to other partners' interests	$ 40	41
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	$ 1,800	1,900
Liabilities	253	263
Noncontrolling interests related to other partners' interests	$ 858	$ 886

Consolidated Entities and Equ_4

Consolidated Entities and Equity Method Investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investment Balance	$ 1,305	$ 1,282
SOUTHERN Co GAS
Schedule of Equity Method Investments [Line Items]
Investment Balance	1,134	1,173
SOUTHERN Co GAS \| SNG
Schedule of Equity Method Investments [Line Items]
Investment Balance	1,099	1,129
SOUTHERN Co GAS \| Other
Schedule of Equity Method Investments [Line Items]
Investment Balance	35	$ 44
SOUTHERN Co GAS \| PennEast Pipeline
Schedule of Equity Method Investments [Line Items]
Distribution	$ 9

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Earnings (Loss) from Equity Method Investments	$ 34	$ (40)	$ 80	$ 5
SOUTHERN Co GAS
Schedule of Equity Method Investments [Line Items]
Earnings (Loss) from Equity Method Investments	31	(52)	71	(11)
Impairment of PennEast Pipeline investment			0	82
SOUTHERN Co GAS \| SNG
Schedule of Equity Method Investments [Line Items]
Earnings (Loss) from Equity Method Investments	31	28	70	66
SOUTHERN Co GAS \| PennEast Pipeline
Schedule of Equity Method Investments [Line Items]
Earnings (Loss) from Equity Method Investments	0	(81)	0	(79)
Impairment of PennEast Pipeline investment		82		82
Asset impairment charges, net of tax		58		58
SOUTHERN Co GAS \| Other
Schedule of Equity Method Investments [Line Items]
Earnings (Loss) from Equity Method Investments	$ 0	$ 1	$ 1	$ 2

Financing and Leases - Schedule

Financing and Leases - Schedule of Credit Arrangements (Details)	6 Months Ended
	Jun. 30, 2022 USD ($) letter_of_credit
Line of Credit Facility [Line Items]
Expires, 2023	$ 280,000,000
Expires, 2024	700,000,000
Expires, 2025	125,000,000
Expires, 2026	6,550,000,000
Total	7,655,000,000
Unused	7,595,000,000
Expires within One Year	280,000,000
Southern Company parent
Line of Credit Facility [Line Items]
Expires, 2023	0
Expires, 2024	0
Expires, 2025	0
Expires, 2026	2,000,000,000
Total	2,000,000,000
Unused	1,998,000,000
Expires within One Year	0
ALABAMA POWER CO
Line of Credit Facility [Line Items]
Expires, 2023	0
Expires, 2024	550,000,000
Expires, 2025	0
Expires, 2026	700,000,000
Total	1,250,000,000
Unused	1,250,000,000
Expires within One Year	0
GEORGIA POWER CO
Line of Credit Facility [Line Items]
Expires, 2023	0
Expires, 2024	0
Expires, 2025	0
Expires, 2026	1,750,000,000
Total	1,750,000,000
Unused	1,726,000,000
Expires within One Year	0
MISSISSIPPI POWER CO
Line of Credit Facility [Line Items]
Expires, 2023	0
Expires, 2024	150,000,000
Expires, 2025	125,000,000
Expires, 2026	0
Total	275,000,000
Unused	275,000,000
Expires within One Year	0
SOUTHERN POWER CO
Line of Credit Facility [Line Items]
Expires, 2023	0
Expires, 2024	0
Expires, 2025	0
Expires, 2026	600,000,000
Total	600,000,000
Unused	568,000,000
Expires within One Year	$ 0
Letter of credits not included \| letter_of_credit	2
SOUTHERN POWER CO \| Continuing Letter of Credit Facility A
Line of Credit Facility [Line Items]
Expires, 2023	$ 75,000,000
Expires, 2025	75,000,000
Unused	11,000,000
SOUTHERN POWER CO \| Continuing Letter of Credit Facility B
Line of Credit Facility [Line Items]
Unused	5,000,000
SOUTHERN Co GAS
Line of Credit Facility [Line Items]
Expires, 2023	250,000,000
Expires, 2024	0
Expires, 2025	0
Expires, 2026	1,500,000,000
Total	1,750,000,000
Unused	1,748,000,000
Expires within One Year	250,000,000
SEGCO
Line of Credit Facility [Line Items]
Expires, 2023	30,000,000
Expires, 2024	0
Expires, 2025	0
Expires, 2026	0
Total	30,000,000
Unused	30,000,000
Expires within One Year	30,000,000
Southern Company Gas Capital
Line of Credit Facility [Line Items]
Expires, 2026	800,000,000
Nicor Gas
Line of Credit Facility [Line Items]
Expires, 2026	$ 700,000,000

Financing and Leases - Narrativ

Financing and Leases - Narrative (Details) - USD ($)	Jun. 30, 2022	Mar. 31, 2022
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 7,655,000,000
Variable rate pollution control revenue bonds outstanding	1,500,000,000
MISSISSIPPI POWER CO
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	275,000,000
Variable rate pollution control revenue bonds outstanding	34,000,000
MISSISSIPPI POWER CO \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 125,000,000
ALABAMA POWER CO
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	1,250,000,000
Variable rate pollution control revenue bonds outstanding	789,000,000
GEORGIA POWER CO
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	1,750,000,000
Variable rate pollution control revenue bonds outstanding	672,000,000
Fixed rate pollution control revenue bonds outstanding	$ 445,000,000

Financing and Leases - Equity U

Financing and Leases - Equity Units (Details) - Junior Subordinated Debt - USD ($) $ in Millions	Aug. 01, 2022	May 31, 2022
Series 2019A Remarketable Junior Subordinated Notes
Debt Instrument [Line Items]
Remarketed principal amount		$ 862.5
Interest rate		4.475%
Series 2019B Remarketable Junior Subordinated Notes
Debt Instrument [Line Items]
Remarketed principal amount		$ 862.5
Interest rate		5.113%
2019 Series A Equity Units \| Scenario, Forecast
Debt Instrument [Line Items]
Common stock issued to settle purchase contracts (in shares)	25,200,000

Financing and Leases - Schedu_2

Financing and Leases - Schedule of Shares Used to Compute Diluted Earnings Per Share (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt Disclosure [Abstract]
As reported shares (in shares)	1,065	1,061	1,064	1,060
Effect of stock-based compensation (in shares)	5	6	5	6
Effect of equity units (in shares)	2	0	1	0
Diluted (in shares)	1,072	1,067	1,070	1,066

Financing and Leases - Georgia

Financing and Leases - Georgia Power Lease Modification (Details) - USD ($) $ in Millions	Jul. 27, 2022	Jun. 30, 2022	Dec. 31, 2021
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets, net of amortization		$ 1,623	$ 1,701
Revision of Prior Period, Adjustment \| Subsequent Event
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets, net of amortization	$ (17)
Lease obligations	(18)
Finance lease ROU assets, net	110
Finance lease obligations	$ 111

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Billions	6 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Billions	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	18.70%	10.70%
ITC and PTC carryforwards
Income Tax Contingency [Line Items]
Deferred tax assets	$ 0.9		$ 1.2
GEORGIA POWER CO
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	16.40%	(6.90%)
MISSISSIPPI POWER CO
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	18.80%	12.60%
SOUTHERN POWER CO
Income Tax Contingency [Line Items]
Effective tax (benefit) rate	11.20%	(12.80%)

Retirement Benefits (Details)

Retirement Benefits (Details) - USD ($)	3 Months Ended		6 Months Ended
Retirement Benefits (Details) - USD ($)	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
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	103,000,000	$ 108,000,000	206,000,000	$ 217,000,000
Interest cost	102,000,000	86,000,000	204,000,000	173,000,000
Expected return on plan assets	(317,000,000)	(297,000,000)	(633,000,000)	(595,000,000)
Amortization:
Prior service costs	0	0	0	0
Regulatory asset	0	0	0	0
Net loss	60,000,000	79,000,000	120,000,000	157,000,000
Net periodic pension cost (income)	(52,000,000)	(24,000,000)	(103,000,000)	(48,000,000)
Pension Plans \| ALABAMA POWER CO
Pension Plans and Postretirement Plans
Service cost	24,000,000	25,000,000	49,000,000	51,000,000
Interest cost	24,000,000	21,000,000	48,000,000	41,000,000
Expected return on plan assets	(75,000,000)	(71,000,000)	(152,000,000)	(143,000,000)
Amortization:
Prior service costs	0	0	0	0
Regulatory asset	0	0	0	0
Net loss	15,000,000	20,000,000	31,000,000	41,000,000
Net periodic pension cost (income)	(12,000,000)	(5,000,000)	(24,000,000)	(10,000,000)
Pension Plans \| GEORGIA POWER CO
Pension Plans and Postretirement Plans
Service cost	26,000,000	28,000,000	52,000,000	56,000,000
Interest cost	30,000,000	26,000,000	61,000,000	52,000,000
Expected return on plan assets	(100,000,000)	(94,000,000)	(199,000,000)	(188,000,000)
Amortization:
Prior service costs	1,000,000	1,000,000	1,000,000	1,000,000
Regulatory asset	0	0	0	0
Net loss	19,000,000	25,000,000	37,000,000	50,000,000
Net periodic pension cost (income)	(24,000,000)	(14,000,000)	(48,000,000)	(29,000,000)
Pension Plans \| MISSISSIPPI POWER CO
Pension Plans and Postretirement Plans
Service cost	4,000,000	5,000,000	8,000,000	9,000,000
Interest cost	4,000,000	4,000,000	9,000,000	8,000,000
Expected return on plan assets	(14,000,000)	(13,000,000)	(29,000,000)	(27,000,000)
Amortization:
Prior service costs	0	0	0	0
Regulatory asset	0	0	0	0
Net loss	4,000,000	3,000,000	7,000,000	7,000,000
Net periodic pension cost (income)	(2,000,000)	(1,000,000)	(5,000,000)	(3,000,000)
Pension Plans \| SOUTHERN POWER CO
Pension Plans and Postretirement Plans
Service cost	3,000,000	3,000,000	5,000,000	5,000,000
Interest cost	1,000,000	1,000,000	3,000,000	2,000,000
Expected return on plan assets	(4,000,000)	(4,000,000)	(8,000,000)	(7,000,000)
Amortization:
Prior service costs	0	0	0	0
Regulatory asset	0	0	0	0
Net loss	0	1,000,000	1,000,000	2,000,000
Net periodic pension cost (income)	0	1,000,000	1,000,000	2,000,000
Pension Plans \| SOUTHERN Co GAS
Pension Plans and Postretirement Plans
Service cost	8,000,000	9,000,000	17,000,000	18,000,000
Interest cost	7,000,000	6,000,000	14,000,000	12,000,000
Expected return on plan assets	(24,000,000)	(22,000,000)	(46,000,000)	(43,000,000)
Amortization:
Prior service costs	0	0	(1,000,000)	(1,000,000)
Regulatory asset	4,000,000	4,000,000	8,000,000	8,000,000
Net loss	1,000,000	3,000,000	3,000,000	6,000,000
Net periodic pension cost (income)	(4,000,000)	0	(5,000,000)	0
Postretirement Benefits
Pension Plans and Postretirement Plans
Service cost	5,000,000	6,000,000	11,000,000	12,000,000
Interest cost	11,000,000	9,000,000	21,000,000	17,000,000
Expected return on plan assets	(20,000,000)	(19,000,000)	(40,000,000)	(38,000,000)
Amortization:
Prior service costs		(1,000,000)		(1,000,000)
Regulatory asset	0	0	0	0
Net loss	0	1,000,000	0	2,000,000
Net periodic pension cost (income)	(4,000,000)	(4,000,000)	(8,000,000)	(8,000,000)
Postretirement Benefits \| ALABAMA POWER CO
Pension Plans and Postretirement Plans
Service cost	2,000,000	2,000,000	3,000,000	3,000,000
Interest cost	2,000,000	2,000,000	5,000,000	4,000,000
Expected return on plan assets	(8,000,000)	(7,000,000)	(16,000,000)	(14,000,000)
Amortization:
Prior service costs		0		0
Regulatory asset	0	0	0	0
Net loss	0	0	0	0
Net periodic pension cost (income)	(4,000,000)	(3,000,000)	(8,000,000)	(7,000,000)
Postretirement Benefits \| GEORGIA POWER CO
Pension Plans and Postretirement Plans
Service cost	1,000,000	1,000,000	3,000,000	3,000,000
Interest cost	3,000,000	3,000,000	7,000,000	6,000,000
Expected return on plan assets	(6,000,000)	(6,000,000)	(13,000,000)	(13,000,000)
Amortization:
Prior service costs		0		0
Regulatory asset	0	0	0	0
Net loss	1,000,000	0	1,000,000	1,000,000
Net periodic pension cost (income)	(1,000,000)	(2,000,000)	(2,000,000)	(3,000,000)
Postretirement Benefits \| MISSISSIPPI POWER CO
Pension Plans and Postretirement Plans
Service cost	0	0	0	0
Interest cost	1,000,000	1,000,000	1,000,000	1,000,000
Expected return on plan assets	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Amortization:
Prior service costs		0		0
Regulatory asset	0	0	0	0
Net loss	0	0	0	0
Net periodic pension cost (income)	0	0	0	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 loss	0	0	0	0
Net periodic pension cost (income)	0	0	0	0
Postretirement Benefits \| SOUTHERN Co GAS
Pension Plans and Postretirement Plans
Service cost	0	1,000,000	1,000,000	1,000,000
Interest cost	1,000,000	1,000,000	2,000,000	2,000,000
Expected return on plan assets	(1,000,000)	(2,000,000)	(3,000,000)	(4,000,000)
Amortization:
Prior service costs		0		0
Regulatory asset	1,000,000	1,000,000	3,000,000	3,000,000
Net loss	0	0	(1,000,000)	(1,000,000)
Net periodic pension cost (income)	$ 1,000,000	$ 1,000,000	$ 2,000,000	$ 1,000,000

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets:
Derivatives	$ 364	$ 213
Liabilities:
Derivatives	472	125
Other	13
Collateral already posted, assets, aggregate fair value	13
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	111	50
Liabilities:
Derivatives	3	6
GEORGIA POWER CO
Assets:
Derivatives	116	67
Investments in trusts	65
Liabilities:
Derivatives	8	0
MISSISSIPPI POWER CO
Assets:
Derivatives	110	52
Liabilities:
Derivatives	3	1
SOUTHERN POWER CO
Assets:
Derivatives	5	4
Liabilities:
Derivatives	45	16
Other	13
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	22	27
Liabilities:
Derivatives	77	16
Total
Collateral already posted, assets, aggregate fair value	13	$ 3
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	1,068
Other investments	36
Total	3,725
Liabilities:
Contingent consideration	14
Total	573
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	1,058
Other investments	9
Total	1,915
Liabilities:
Contingent consideration	0
Total	16
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	10
Other investments	27
Total	1,646
Liabilities:
Contingent consideration	0
Total	543
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0
Other investments	0
Total	0
Liabilities:
Contingent consideration	14
Total	14
Fair Value, Measurements, Recurring \| Net Asset Value as a Practical Expedient (NAV)
Assets:
Total	164
Fair Value, Measurements, Recurring \| Energy-related derivatives
Assets:
Derivatives	451
Liabilities:
Derivatives	104
Fair Value, Measurements, Recurring \| Energy-related derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	43
Liabilities:
Derivatives	16
Fair Value, Measurements, Recurring \| Energy-related derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	408
Liabilities:
Derivatives	88
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
Liabilities:
Derivatives	214
Fair Value, Measurements, Recurring \| Interest rate derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| Interest rate derivatives \| Significant Other Observable Inputs (Level 2)
Liabilities:
Derivatives	214
Fair Value, Measurements, Recurring \| Interest rate derivatives \| Significant Unobservable Inputs (Level 3)
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| Domestic equity
Assets:
Investments in trusts	811
Fair Value, Measurements, Recurring \| Domestic equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	643
Fair Value, Measurements, Recurring \| Domestic equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	168
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	266
Fair Value, Measurements, Recurring \| Foreign equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	122
Fair Value, Measurements, Recurring \| Foreign equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	144
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	273
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	273
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	56
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	56
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	9
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	9
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	446
Fair Value, Measurements, Recurring \| Corporate bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	1
Fair Value, Measurements, Recurring \| Corporate bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	445
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	89
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	89
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	164
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	164
Fair Value, Measurements, Recurring \| Cash and cash equivalents
Assets:
Investments in trusts	3
Fair Value, Measurements, Recurring \| Cash and cash equivalents \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	3
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	53
Fair Value, Measurements, Recurring \| Other \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	36
Fair Value, Measurements, Recurring \| Other \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	17
Fair Value, Measurements, Recurring \| Other \| Significant Unobservable Inputs (Level 3)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| Foreign currency derivatives
Liabilities:
Derivatives	228
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	228
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	687
Other investments	27
Total	1,968
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	677
Other investments	0
Total	1,211
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	10
Other investments	27
Total	593
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	164
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Energy-related derivatives
Assets:
Derivatives	131
Liabilities:
Derivatives	23
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	131
Liabilities:
Derivatives	23
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	550
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Domestic equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	391
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Domestic equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	159
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	122
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Foreign equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	122
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	17
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	17
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	2
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	2
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	228
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Corporate bonds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	1
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Corporate bonds \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	227
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	20
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	20
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	164
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	164
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Other
Assets:
Investments in trusts	20
Fair Value, Measurements, Recurring \| ALABAMA POWER CO \| Other \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	20
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 \| GEORGIA POWER CO
Assets:
Cash equivalents	98
Total	1,260
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	98
Total	366
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	0
Total	894
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0
Total	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Energy-related derivatives
Assets:
Derivatives	137
Liabilities:
Derivatives	29
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	137
Liabilities:
Derivatives	29
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	253
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Domestic equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	252
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	142
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Foreign equity \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	0
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Foreign equity \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	142
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	256
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	256
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	54
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	54
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	218
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	218
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	33
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Other \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Investments in trusts	16
Fair Value, Measurements, Recurring \| GEORGIA POWER CO \| Other \| Significant Other Observable Inputs (Level 2)
Assets:
Investments in trusts	17
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	121
Liabilities:
Derivatives	14
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	121
Liabilities:
Derivatives	14
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
Liabilities:
Contingent consideration	14
Total	73
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Contingent consideration	0
Total	0
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Significant Other Observable Inputs (Level 2)
Liabilities:
Contingent consideration	0
Total	59
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Significant Unobservable Inputs (Level 3)
Liabilities:
Contingent consideration	14
Total	14
Fair Value, Measurements, Recurring \| SOUTHERN POWER CO \| Energy-related derivatives
Assets:
Derivatives	6
Liabilities:
Derivatives	1
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	6
Liabilities:
Derivatives	1
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	45
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	45
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	192
Total	270
Liabilities:
Total	98
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	192
Total	238
Liabilities:
Total	16
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	0
Total	32
Liabilities:
Total	82
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	56
Liabilities:
Derivatives	36
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Energy-related derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Derivatives	43
Liabilities:
Derivatives	16
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Energy-related derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	13
Liabilities:
Derivatives	20
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
Liabilities:
Derivatives	62
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Interest rate derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Interest rate derivatives \| Significant Other Observable Inputs (Level 2)
Liabilities:
Derivatives	62
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Interest rate derivatives \| Significant Unobservable Inputs (Level 3)
Liabilities:
Derivatives	0
Fair Value, Measurements, Recurring \| SOUTHERN Co GAS \| Domestic equity
Assets:
Non-qualified deferred compensation trusts	8
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	8
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	2
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	2
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	9
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	9
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	3
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	3
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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
Increase (decrease) in fair value of funds	$ (230)	$ 125	$ (380)	$ 164
ALABAMA POWER CO
Fair Value, Option, Quantitative Disclosures [Line Items]
Increase (decrease) in fair value of funds	(125)	77	(192)	118
GEORGIA POWER CO
Fair Value, Option, Quantitative Disclosures [Line Items]
Increase (decrease) in fair value of funds	$ (105)	$ 48	$ (188)	$ 46

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - ALABAMA POWER CO - Private equity $ in Millions	Jun. 30, 2022 USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair value	$ 164
Unfunded commitments	$ 91

Fair Value Measurements - Sch_3

Fair Value Measurements - Schedule of Financial Instruments for which Carrying Amount did not Equal Fair Value (Details) $ in Millions	Jun. 30, 2022 USD ($)
Long-term debt, including securities due within one year:
Carrying amount	$ 52,000
Fair value	48,000
ALABAMA POWER CO
Long-term debt, including securities due within one year:
Carrying amount	9,800
Fair value	9,000
GEORGIA POWER CO
Long-term debt, including securities due within one year:
Carrying amount	14,600
Fair value	13,700
MISSISSIPPI POWER CO
Long-term debt, including securities due within one year:
Carrying amount	1,500
Fair value	1,300
SOUTHERN POWER CO
Long-term debt, including securities due within one year:
Carrying amount	3,000
Fair value	2,900
SOUTHERN Co GAS
Long-term debt, including securities due within one year:
Carrying amount	6,800
Fair value	$ 6,200

Derivatives - Schedule of Energ

Derivatives - Schedule of Energy-Related Derivatives (Details) - Energy-related, Natural Gas MMBTU in Millions	Jun. 30, 2022 MMBTU
Energy-related derivative contracts
Net Purchased mmBtu	273
ALABAMA POWER CO
Energy-related derivative contracts
Net Purchased mmBtu	65
GEORGIA POWER CO
Energy-related derivative contracts
Net Purchased mmBtu	75
MISSISSIPPI POWER CO
Energy-related derivative contracts
Net Purchased mmBtu	71
SOUTHERN POWER CO
Energy-related derivative contracts
Net Purchased mmBtu	4
SOUTHERN Co GAS
Energy-related derivative contracts
Net Purchased mmBtu	58
SOUTHERN Co GAS \| Derivatives not designated as hedging instruments \| Long
Energy-related derivative contracts
Derivative nonmonetary notional amount net long short position volume	64.4
SOUTHERN Co GAS \| Derivatives not designated as hedging instruments \| Short
Energy-related derivative contracts
Derivative nonmonetary notional amount net long short position volume	6.4

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) MMBTU in Millions	6 Months Ended
Derivatives - Narrative (Details) MMBTU in Millions	Jun. 30, 2022 USD ($) MMBTU	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU	15
Energy-related derivative hedge gain (loss) to be reclassified within twelve months	$ 12,000,000
Collateral already posted, assets, aggregate fair value	13,000,000
Interest rate derivatives
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months	$ (16,000,000)
ALABAMA POWER CO
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU	4
GEORGIA POWER CO
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU	5
MISSISSIPPI POWER CO
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU	2
SOUTHERN POWER CO
Derivative [Line Items]
Expected volume of natural gas subject to option to sell back excess gas due to operational constraints \| MMBTU	4
Foreign currency cash flow hedge gain (loss) to be reclassified during next 12 months	$ 11,000,000
Registrants \| Derivative Counterparties
Derivative [Line Items]
Collateral already posted, assets, aggregate fair value	0
SOUTHERN Co GAS
Derivative [Line Items]
Collateral already posted, assets, aggregate fair value	$ 13,000,000	$ 3,000,000

Derivatives - Schedule of Inter

Derivatives - Schedule of Interest Rate Derivatives (Details) - Interest rate derivatives $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Derivative [Line Items]
Notional Amount	$ 2,200
Fair Value Gain (Loss)	(214)
ALABAMA POWER CO \| Cash Flow Hedges of Existing Debt
Derivative [Line Items]
Notional Amount	$ 50
Interest Rate Received	0%
Weighted Average Interest Rate Paid	3.18%
Fair Value Gain (Loss)	$ 0
SOUTHERN Co GAS \| Cash Flow Hedges of Existing Debt
Derivative [Line Items]
Notional Amount	$ 250
Interest Rate Received	0%
Weighted Average Interest Rate Paid	3.26%
Fair Value Gain (Loss)	$ (5)
SOUTHERN Co GAS \| Fair Value Hedges of Existing Debt
Derivative [Line Items]
Notional Amount	$ 500
Interest Rate Received	1.75%
Fair Value Gain (Loss)	$ (57)
Southern Company parent \| Fair Value Hedges of Existing Debt \| March 2028
Derivative [Line Items]
Notional Amount	$ 400
Interest Rate Received	1.75%
Fair Value Gain (Loss)	$ (39)
Southern Company parent \| Fair Value Hedges of Existing Debt \| April 2030
Derivative [Line Items]
Notional Amount	$ 1,000
Interest Rate Received	3.70%
Fair Value Gain (Loss)	$ (113)
London Interbank Offered Rate (LIBOR) \| SOUTHERN Co GAS \| Fair Value Hedges of Existing Debt
Derivative [Line Items]
Weighted Average Interest Rate Paid	0.38%
London Interbank Offered Rate (LIBOR) \| Southern Company parent \| Fair Value Hedges of Existing Debt \| March 2028
Derivative [Line Items]
Weighted Average Interest Rate Paid	0.68%
London Interbank Offered Rate (LIBOR) \| Southern Company parent \| Fair Value Hedges of Existing Debt \| April 2030
Derivative [Line Items]
Weighted Average Interest Rate Paid	2.36%

Derivatives - Schedule of Forei

Derivatives - Schedule of Foreign Currency Derivatives (Details) - 6 months ended Jun. 30, 2022 - Foreign currency derivatives € in Millions, $ in Millions	USD ($)	EUR (€)
Derivative [Line Items]
Pay Notional	$ 2,040
Receive Notional \| €		€ 1,750
Fair Value Gain (Loss)	(228)
Fair Value Hedges of Existing Debt \| Southern Company parent
Derivative [Line Items]
Pay Notional	$ 1,476
Pay Rate	3.39%
Receive Notional \| €		1,250
Receive Rate	1.88%
Fair Value Gain (Loss)	$ (183)
Cash Flow Hedges of Existing Debt \| SOUTHERN POWER CO \| April 2030
Derivative [Line Items]
Pay Notional	$ 564
Pay Rate	3.78%
Receive Notional \| €		€ 500
Receive Rate	1.85%
Fair Value Gain (Loss)	$ (45)

Derivatives - Schedule of Deriv

Derivatives - Schedule of Derivative Category and Balance Sheet Location (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	$ 451	$ 238
Derivative asset, Gross amounts offset	(87)	(25)
Derivative asset, net amounts recognized in the balance sheets	364	213
Derivative liability, gross amount recognized	546	153
Derivative liability, Gross amounts offset	(74)	(28)
Derivative liability, net amounts recognized in the balance sheets	472	125
Collateral already posted, assets, aggregate fair value	13
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	17	10
Derivative liability, gross amount recognized	13	4
Derivatives not designated as hedging instruments \| Energy-related derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	15	9
Derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	12	4
Derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred charges and assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	2	1
Derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	1	0
Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	411	201
Derivative liability, gross amount recognized	86	36
Derivatives designated as hedging instruments for regulatory purposes \| 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	267	129
Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	49	30
Derivatives designated as hedging instruments for regulatory purposes \| 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	144	72
Derivatives designated as hedging instruments for regulatory purposes \| 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	6
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	23	27
Derivative liability, gross amount recognized	447	113
Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	17	7
Derivatives designated as hedging instruments in cash flow and fair value hedges \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	5	5
Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	6	1
Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	0	0
Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	0	19
Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	0
Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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 \| 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	195	29
Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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 \| Derivatives designated as hedging instruments for regulatory purposes \| Foreign currency derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	36	39
Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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 \| 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	192	40
ALABAMA POWER CO
Derivatives, Fair Value [Line Items]
Derivative asset, Gross amounts offset	(20)	(5)
Derivative asset, net amounts recognized in the balance sheets	111	50
Derivative liability, Gross amounts offset	(20)	(5)
Derivative liability, net amounts recognized in the balance sheets	3	6
ALABAMA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	131	55
Derivative liability, gross amount recognized	23	11
ALABAMA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	76	30
ALABAMA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	6	9
ALABAMA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| 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	55	25
ALABAMA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| 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	17	2
GEORGIA POWER CO
Derivatives, Fair Value [Line Items]
Derivative asset, Gross amounts offset	(21)	(8)
Derivative asset, net amounts recognized in the balance sheets	116	67
Derivative liability, Gross amounts offset	(21)	(8)
Derivative liability, net amounts recognized in the balance sheets	8	0
GEORGIA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	137	75
Derivative liability, gross amount recognized	29	8
GEORGIA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| 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	102	54
GEORGIA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	15	6
GEORGIA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| 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	35	21
GEORGIA POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| 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	14	2
MISSISSIPPI POWER CO
Derivatives, Fair Value [Line Items]
Derivative asset, Gross amounts offset	(11)	(4)
Derivative asset, net amounts recognized in the balance sheets	110	52
Derivative liability, Gross amounts offset	(11)	(4)
Derivative liability, net amounts recognized in the balance sheets	3	1
MISSISSIPPI POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	121	56
Derivative liability, gross amount recognized	14	5
MISSISSIPPI POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| 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	67	30
MISSISSIPPI POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	8	3
MISSISSIPPI POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| 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	54	26
MISSISSIPPI POWER CO \| Derivatives designated as hedging instruments for regulatory purposes \| 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	6	2
SOUTHERN POWER CO
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	6	4
Derivative asset, Gross amounts offset	(1)	0
Derivative asset, net amounts recognized in the balance sheets	5	4
Derivative liability, gross amount recognized	46	16
Derivative liability, Gross amounts offset	(1)	0
Derivative liability, net amounts recognized in the balance sheets	45	16
SOUTHERN POWER CO \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	2	1
Derivative liability, gross amount recognized	1	0
SOUTHERN POWER CO \| Derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	1	1
SOUTHERN POWER CO \| Derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	1	0
SOUTHERN POWER CO \| 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	0
SOUTHERN POWER CO \| 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 \| Derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	4	3
Derivative liability, gross amount recognized	45	16
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	2
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current 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 \| 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	4	1
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	0	0
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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 \| 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	16
SOUTHERN POWER CO \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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 \| 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	34	0
SOUTHERN Co GAS
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	56	35
Derivative asset, Gross amounts offset	(34)	(8)
Derivative asset, net amounts recognized in the balance sheets	22	27
Derivative liability, gross amount recognized	98	27
Derivative liability, Gross amounts offset	(21)	(11)
Derivative liability, net amounts recognized in the balance sheets	77	16
Collateral already posted, assets, aggregate fair value	13	3
SOUTHERN Co GAS \| Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	14	9
Derivative liability, gross amount recognized	12	4
SOUTHERN Co GAS \| Derivatives not designated as hedging instruments \| Energy-related derivatives \| Assets from risk management activities
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	13	8
SOUTHERN Co GAS \| Derivatives not designated as hedging instruments \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	11	4
SOUTHERN Co GAS \| 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 Co GAS \| Derivatives not designated as hedging instruments \| Energy-related derivatives \| Other deferred credits and liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	1	0
SOUTHERN Co GAS \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	23	15
Derivative liability, gross amount recognized	19	12
SOUTHERN Co GAS \| Derivatives designated as hedging instruments for regulatory purposes \| 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	23	15
SOUTHERN Co GAS \| Derivatives designated as hedging instruments for regulatory purposes \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	19	12
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Derivatives designated as hedging instruments for regulatory purposes
Derivatives, Fair Value [Line Items]
Derivative asset, gross amount recognized	19	11
Derivative liability, gross amount recognized	67	11
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	17	5
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| Derivatives designated as hedging instruments for regulatory purposes \| Energy-related derivatives \| Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	5	5
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	2	0
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	0	0
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	0	6
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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 \| 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	62	6
SOUTHERN Co GAS \| Derivatives designated as hedging instruments in cash flow and fair value hedges \| 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	$ 0	$ 0

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, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	$ 315	$ 155
Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(26)	(17)
Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(3)
Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	234	107
Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	110	65
ALABAMA POWER CO
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	108	44
ALABAMA POWER CO \| Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(2)	(6)
ALABAMA POWER CO \| Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(1)
ALABAMA POWER CO \| Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	72	28
ALABAMA POWER CO \| Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	39	22
GEORGIA POWER CO
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	108	67
GEORGIA POWER CO \| Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(6)	0
GEORGIA POWER CO \| Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(1)
GEORGIA POWER CO \| Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	93	48
GEORGIA POWER CO \| Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	22	19
MISSISSIPPI POWER CO
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	107	51
MISSISSIPPI POWER CO \| Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(3)	0
MISSISSIPPI POWER CO \| Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(1)
MISSISSIPPI POWER CO \| Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	62	27
MISSISSIPPI POWER CO \| Other regulatory liabilities, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	49	24
SOUTHERN Co GAS
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(8)	(7)
SOUTHERN Co GAS \| Other regulatory assets, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	(15)	(11)
SOUTHERN Co GAS \| Other regulatory assets, deferred
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	0
SOUTHERN Co GAS \| Other regulatory liabilities, current
Derivative Instruments, Gain (Loss) [Line Items]
Total energy-related derivative gains (losses)	7	4
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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	$ (61)	$ 19	$ (34)	$ (21)
Cash Flow Hedging \| Energy-related derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(1)	16	41	20
Cash Flow Hedging \| Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	21	(1)	30	2
Cash Flow Hedging \| Foreign currency derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(74)	4	(102)	(43)
Fair Value Hedging \| Foreign currency derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(7)	0	(3)	0
GEORGIA POWER CO \| Cash Flow Hedging \| Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	19	0	31	0
SOUTHERN POWER CO
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(72)	9	(95)	(35)
SOUTHERN POWER CO \| Cash Flow Hedging \| Energy-related derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	2	5	7	8
SOUTHERN POWER CO \| Cash Flow Hedging \| Foreign currency derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(74)	4	(102)	(43)
SOUTHERN Co GAS
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(7)	11	30	12
SOUTHERN Co GAS \| Cash Flow Hedging \| Energy-related derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	(2)	11	35	12
SOUTHERN Co GAS \| Cash Flow Hedging \| Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in OCI on Derivative	$ (5)	$ 0	$ (5)	$ 0

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative [Line Items]
Depreciation and amortization	$ 913	$ 891	$ 1,805	$ 1,762
Total interest expense, net of amounts capitalized	(488)	(450)	(950)	(901)
Total other income (expense), net	139	101	283	160
Natural gas
Derivative [Line Items]
Total cost of sales	452	231	1,546	814
Other Income (Expense)
Derivative [Line Items]
Amount excluded from effectiveness testing recognized in earnings	7	0	3	0
Cash Flow Hedging \| Energy-related derivatives \| Cost of Sales
Derivative [Line Items]
Gain (loss) on hedges	10	1	18	(2)
Cash Flow Hedging \| Energy-related derivatives \| Depreciation and Amortization
Derivative [Line Items]
Gain (loss) on hedges	4	1	6	4
Cash Flow Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(6)	(7)	(13)	(14)
Cash Flow Hedging \| Foreign currency derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(7)	(6)	(13)	(12)
Cash Flow Hedging \| Foreign currency derivatives \| Other Income (Expense)
Derivative [Line Items]
Gain (loss) on hedges	(73)	17	(97)	(43)
Fair Value Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(76)	(3)	(198)	(12)
Fair Value Hedging \| Foreign currency derivatives \| Other Income (Expense)
Derivative [Line Items]
Gain (loss) on hedges	(96)	0	(121)	0
SOUTHERN POWER CO
Derivative [Line Items]
Depreciation and amortization	131	132	251	251
Total interest expense, net of amounts capitalized	(36)	(37)	(73)	(75)
Total other income (expense), net	1	1	3	8
SOUTHERN POWER CO \| Cash Flow Hedging \| Energy-related derivatives \| Depreciation and Amortization
Derivative [Line Items]
Gain (loss) on hedges	4	1	6	4
SOUTHERN POWER CO \| Cash Flow Hedging \| Foreign currency derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(7)	(6)	(13)	(12)
SOUTHERN POWER CO \| Cash Flow Hedging \| Foreign currency derivatives \| Other Income (Expense)
Derivative [Line Items]
Gain (loss) on hedges	(73)	17	(97)	(43)
SOUTHERN Co GAS
Derivative [Line Items]
Depreciation and amortization	138	133	275	263
Total interest expense, net of amounts capitalized	(61)	(59)	(122)	(118)
Total other income (expense), net	16	(14)	32	(78)
SOUTHERN Co GAS \| Natural gas
Derivative [Line Items]
Total cost of sales	452	231	1,546	814
SOUTHERN Co GAS \| Cash Flow Hedging \| Energy-related derivatives \| Cost of Sales
Derivative [Line Items]
Gain (loss) on hedges	10	0	18	(2)
SOUTHERN Co GAS \| Cash Flow Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	(1)	(1)	(1)	(1)
SOUTHERN Co GAS \| Fair Value Hedging \| Interest rate derivatives \| Interest Expense
Derivative [Line Items]
Gain (loss) on hedges	$ (22)	$ 4	$ (57)	$ 4

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, 2022	Dec. 31, 2021
Derivative [Line Items]
Carrying Amount of the Hedged Item	$ (2,981)	$ (3,280)
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item	192	9
SOUTHERN Co GAS
Derivative [Line Items]
Carrying Amount of the Hedged Item	(437)	(493)
Cumulative Amount of Fair Value Hedging Adjustment included in Carrying Amount of the Hedged Item	$ 59	$ 2

Derivatives - Schedule of Pre_4

Derivatives - Schedule of Pre-tax Effect of Interest Rate and Energy Related Derivatives on Income (Details) - Derivatives not designated as hedging instruments - Energy-related derivatives - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ (40)	$ (94)	$ (18)	$ (104)
Natural gas revenues
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	(15)	(103)	(13)	(120)
Cost of natural gas
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss), net	$ (25)	$ 9	$ (5)	$ 16

Acquisitions and Dispositions -

Acquisitions and Dispositions - Southern Power Narrative (Details) - SOUTHERN POWER CO - MW	1 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2022	Feb. 28, 2022	Jun. 30, 2022	Dec. 31, 2021
Tranquillity Solar Storage
Business Acquisition [Line Items]
Nameplate capacity placed in service (in MWs)	40		40	32
Garland Solar Storage
Business Acquisition [Line Items]
Nameplate capacity placed in service (in MWs)		15	15	73

Acquisitions and Dispositions_2

Acquisitions and Dispositions - Schedule of Construction Projects (Details) - SOUTHERN POWER CO - MW	1 Months Ended		5 Months Ended	6 Months Ended		12 Months Ended
	Mar. 31, 2022	Feb. 28, 2022	Mar. 31, 2022	Jun. 30, 2022	Feb. 28, 2022	Dec. 31, 2021
Garland Solar Storage
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)				88
PPA Contract Period					20 years
Nameplate capacity placed in service (in MWs)		15		15		73
Tranquillity Solar Storage
Business Acquisition [Line Items]
Approximate Nameplate Capacity (MW)				72
PPA Contract Period			20 years
Nameplate capacity placed in service (in MWs)	40			40		32

Acquisitions and Dispositions_3

Acquisitions and Dispositions - Southern Company Gas (Details) $ in Millions	May 20, 2022 USD ($)
SOUTHERN Co GAS \| Pivotal LNG \| Disposal Group, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses, amount held back	$ 5

Segment and Related Informati_3

Segment and Related Information - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) state	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment state	Jun. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of states in which entity operates \| state	3		3
Operating revenues	$ 6,226	$ 5,422	$ 12,486	$ 12,319
SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Operating revenues	$ 731	316	$ 1,146	611
SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Number of states in which entity operates \| state	4		4
Operating revenues	$ 1,063	1,349	$ 3,105	4,325
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%
SOUTHERN Co GAS \| PennEast Pipeline
Segment Reporting Information [Line Items]
Ownership percentage, equity method investment	20%		20%
Traditional Electric Operating Companies \| Wholesale revenues, affiliates \| SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Operating revenues	$ 232	112	$ 337	193
SOUTHERN POWER CO \| Natural gas \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues		$ 6		$ 18

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Segment net income (loss)	1,107	372	2,139	1,508
Goodwill	5,280		5,280		$ 5,280
Total assets	130,769		130,769		127,534
Estimated loss on Plant Vogtle Units 3 and 4	52	460	52	508
GEORGIA POWER CO
Segment Reporting Information [Line Items]
Operating revenues	3,121	2,225	5,328	4,195
Total assets	50,974		50,974		48,461
Estimated loss on Plant Vogtle Units 3 and 4	52	460	52	508
Estimated loss on Plant Vogtle Units 3 and 4, net of tax	39	343	39	379
SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Operating revenues	899	490	1,438	930
Segment net income (loss)	98	36	170	133
Total assets	13,402		13,402		13,390
Gain on sale			2	39
SOUTHERN POWER CO \| Wind Generating Facility
Segment Reporting Information [Line Items]
Gain on sale				37
Gain on sale, net of tax				28
SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	1,083	677	3,140	2,371
Segment net income (loss)	115	(65)	433	333
Goodwill	5,015		5,015		5,015
Total assets	23,618		23,618		23,560
Impairment of PennEast Pipeline investment			0	82
SOUTHERN Co GAS \| PennEast Pipeline
Segment Reporting Information [Line Items]
Impairment of PennEast Pipeline investment		82		82
Asset impairment charges, net of tax		58		58
Electric Utilities
Segment Reporting Information [Line Items]
Operating revenues	6,006	4,407	10,516	8,524
SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	1,083	677	3,140	2,371
Gas distribution operations \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Goodwill	4,034		4,034		4,034
Wholesale Gas Services \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues		(110)		188
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	1,080	672	3,133	2,373
Segment net income (loss)	116	(62)	425	332
Total assets	24,170		24,170		23,971
Operating Segments \| Electric Utilities
Segment Reporting Information [Line Items]
Operating revenues	6,006	4,407	10,516	8,524
Segment net income (loss)	1,134	547	1,981	1,400
Goodwill	2		2		2
Total assets	105,357		105,357		101,774
Operating Segments \| Traditional Electric Operating Companies
Segment Reporting Information [Line Items]
Operating revenues	5,563	4,031	9,778	7,795
Segment net income (loss)	1,036	511	1,811	1,267
Goodwill	0		0		0
Total assets	92,742		92,742		89,051
Operating Segments \| SOUTHERN POWER CO
Segment Reporting Information [Line Items]
Operating revenues	899	490	1,438	930
Segment net income (loss)	98	36	170	133
Goodwill	2		2		2
Total assets	13,402		13,402		13,390
Operating Segments \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	1,083	677	3,140	2,371
Segment net income (loss)	115	(65)	433	333
Goodwill	5,015		5,015		5,015
Total assets	23,618		23,618		23,560
Operating Segments \| Gas distribution operations \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	980	710	2,782	1,910
Segment net income (loss)	92	80	306	263
Total assets	21,183		21,183		20,917
Operating Segments \| Gas Pipeline Investments \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	8	8	16	16
Segment net income (loss)	23	(36)	52	(7)
Total assets	1,433		1,433		1,467
Operating Segments \| Wholesale Gas Services \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	0	(110)	0	188
Segment net income (loss)	0	(112)	0	14
Total assets	0		0		31
Operating Segments \| Gas marketing services \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	92	64	335	259
Segment net income (loss)	1	6	67	62
Total assets	1,554		1,554		1,556
Operating Segments \| All Other
Segment Reporting Information [Line Items]
Operating revenues	159	154	283	288
Segment net income (loss)	(137)	(108)	(263)	(216)
Goodwill	263		263		263
Total assets	2,457		2,457		2,975
Operating Segments \| All Other \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	10	11	26	18
Segment net income (loss)	(1)	(3)	8	1
Total assets	11,999		11,999		12,114
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(42)	(40)	(85)	(75)
Segment net income (loss)	(5)	(2)	(12)	(9)
Goodwill	0		0		0
Total assets	(663)		(663)		(775)
Eliminations \| SOUTHERN Co GAS
Segment Reporting Information [Line Items]
Operating revenues	(7)	(6)	(19)	(20)
Segment net income (loss)	0	0	0	0
Total assets	(12,551)		(12,551)		(12,525)
Eliminations \| Electric Utilities
Segment Reporting Information [Line Items]
Operating revenues	(456)	(114)	(700)	(201)
Segment net income (loss)	0	$ 0	0	$ 0
Goodwill	0		0		0
Total assets	$ (787)		$ (787)		$ (667)

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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Concentration Risk [Line Items]
Operating revenues	$ 7,206	$ 5,198	$ 13,854	$ 11,108
Retail
Concentration Risk [Line Items]
Operating revenues	4,789	3,599	8,402	6,941
Wholesale Electric
Concentration Risk [Line Items]
Operating revenues	937	546	1,601	1,091
Natural Gas
Concentration Risk [Line Items]
Operating revenues	1,083	677	3,140	2,371
Electric Utilities
Concentration Risk [Line Items]
Operating revenues	6,006	4,407	10,516	8,524
Electric Utilities \| Retail
Concentration Risk [Line Items]
Operating revenues	4,789	3,599	8,402	6,941
Electric Utilities \| Wholesale Electric
Concentration Risk [Line Items]
Operating revenues	937	546	1,601	1,091
Electric Utilities \| Other Revenue
Concentration Risk [Line Items]
Operating revenues	280	262	513	492
Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	1,083	677	3,140	2,371
Southern Company Gas' Revenues \| Gas Distribution Operations
Concentration Risk [Line Items]
Operating revenues	975	706	2,765	1,898
Southern Company Gas' Revenues \| Wholesale Gas Services
Concentration Risk [Line Items]
Operating revenues	0	(110)	0	188
Southern Company Gas' Revenues \| Gas marketing services
Concentration Risk [Line Items]
Operating revenues	92	64	335	259
Southern Company Gas' Revenues \| Other
Concentration Risk [Line Items]
Operating revenues	16	17	40	26
Southern Company Gas' Revenues
Concentration Risk [Line Items]
Operating revenues	$ 1,083	677	$ 3,140	2,371
Southern Company Gas' Revenues \| Wholesale Gas Services
Concentration Risk [Line Items]
Operating revenues		(110)		188
Less Gross Gas Costs		1,429		3,783
Third Party Gross Revenues \| Southern Company Gas' Revenues \| Wholesale Gas Services
Concentration Risk [Line Items]
Operating revenues		1,292		3,881
Intercompany Revenues \| Southern Company Gas' Revenues \| Wholesale Gas Services
Concentration Risk [Line Items]
Operating revenues		27		90
Total Gross Revenues \| Southern Company Gas' Revenues \| Wholesale Gas Services
Concentration Risk [Line Items]
Operating revenues		$ 1,319		$ 3,971