Marathon Petroleum (MPC) 10-Q2 Aug 222022 Q2 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2022	Jul. 29, 2022
Cover [Abstract]
Entity Central Index Key	0001510295
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Amendment Flag	false
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-35054
Entity Registrant Name	Marathon Petroleum Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-1284632
Entity Address, Address Line One	539 South Main Street
Entity Address, City or Town	Findlay
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45840-3229
City Area Code	419
Local Phone Number	422-2121
Title of 12(b) Security	Common Stock, par value $.01
Trading Symbol	MPC
Security Exchange Name	NYSE
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		498,624,055

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022		Jun. 30, 2021
Revenues and other income:
Sales and other operating revenues	$ 53,795	$ 29,615		$ 91,853	[1]	$ 52,326	[1]
Income from equity method investments	147	93		289		184
Net gain on disposal of assets	39	0		21		3
Other income	257	119		459		196
Total revenues and other income	54,238	29,827		92,622		52,709
Costs and expenses:
Cost of revenues (excludes items below)	44,207	27,177		79,275		48,261
Depreciation and amortization	819	871	[2]	1,624		1,715	[2]
Selling, general and administrative expenses	694	625		1,297		1,200
Other taxes	190	189		382		351
Total costs and expenses	45,910	28,862		82,578		51,527
Income from continuing operations	8,328	965		10,044		1,182
Net interest and other financial costs	312	372		574		725
Income from continuing operations before income taxes	8,016	593		9,470		457
Provision for income taxes on continuing operations	1,799	5		2,081		39
Income from continuing operations, net of tax	6,217	588		7,389		418
Income from discontinued operations, net of tax	0	8,214		0		8,448
Net income	6,217	8,802		7,389		8,866
Less net income attributable to:
Redeemable noncontrolling interest	21	21		42		41
Noncontrolling interests	323	269		629		555
Net income attributable to MPC	$ 5,873	$ 8,512		$ 6,718		$ 8,270
Basic:
Continuing operations	$ 11.03	$ 0.46		$ 12.24		$ (0.27)
Discontinued operations	0	12.63		0		12.98
Net income per share	$ 11.03	$ 13.09		$ 12.24		$ 12.71
Weighted average shares outstanding	532	650		549		651
Diluted:
Continuing operations	$ 10.95	$ 0.45		$ 12.15		$ (0.27)
Discontinued operations	0	12.55		0		12.98
Net income per share	$ 10.95	$ 13		$ 12.15		$ 12.71
Weighted average shares outstanding	536	654		553		651

[1]Includes related party sales. See Note 7 for additional information[2]The three and six months ended June 30, 2021 includes $43 million of impairments of long lived assets.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income	$ 6,217	$ 8,802	$ 7,389	$ 8,866
Other comprehensive income	9	171	2	172
Comprehensive income	6,226	8,973	7,391	9,038
Less comprehensive income attributable to:
Redeemable noncontrolling interest	21	21	42	41
Noncontrolling interests	323	269	629	555
Comprehensive income attributable to MPC	5,882	8,683	6,720	8,442
Actuarial changes
Other comprehensive income	21	183	33	192
Prior service
Other comprehensive income	(12)	(8)	(25)	(16)
Other
Other comprehensive income	$ 0	$ (4)	$ (6)	$ (4)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Actuarial changes
OCI, tax expense (benefit)	$ 7	$ 61	$ 11	$ 64
Prior service
OCI, tax expense (benefit)	(4)	(2)	(8)	(5)
Other
OCI, tax expense (benefit)	$ 0	$ (2)	$ (2)	$ (2)

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents	$ 9,078	$ 5,291
Short-term investments	4,241	5,548
Receivables, less allowance for doubtful accounts of $39 and $40, respectively	17,305	11,034
Inventories	11,048	8,055
Other current assets	741	568
Total current assets	42,413	30,496
Equity method investments	5,508	5,409
Property, plant and equipment, net	37,062	37,440
Goodwill	8,244	8,256
Right of use assets	1,276	1,372
Other noncurrent assets	2,234	2,400
Total assets	96,737	85,373
Liabilities
Accounts payable	22,502	13,700
Payroll and benefits payable	619	911
Accrued taxes	2,584	1,231
Debt due within one year	1,087	571
Operating lease liabilities	391	438
Other current liabilities	1,254	1,047
Total current liabilities	28,437	17,898
Long-term debt	25,687	24,968
Deferred income taxes	5,542	5,638
Defined benefit postretirement plan obligations	1,133	1,015
Long-term operating lease liabilities	879	927
Deferred credits and other liabilities	1,390	1,346
Total liabilities	63,068	51,792
Commitments and contingencies (see Note 23)
Redeemable noncontrolling interest	965	965
Equity
Preferred stock, no shares issued and outstanding (par value $0.01 per share, 30 million shares authorized)	0	0
Common stock:
Issued – 989 million and 984 million shares (par value $0.01 per share, 2 billion shares authorized)	10	10
Held in treasury, at cost – 476 million and 405 million shares	(26,000)	(19,904)
Additional paid-in capital	33,378	33,262
Retained earnings	18,983	12,905
Accumulated other comprehensive loss	(65)	(67)
Total MPC stockholders’ equity	26,306	26,206
Noncontrolling interests	6,398	6,410
Total equity	32,704	32,616
Total liabilities, redeemable noncontrolling interest and equity	$ 96,737	$ 85,373

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 39	$ 40
Preferred stock:
Preferred Stock, Shares Issued	0
Preferred Stock, Shares Outstanding	0
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred Stock, Shares Authorized	30
Common stock:
Common Stock, Shares, Issued	989	984
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Shares Authorized	2,000
Treasury Stock, Shares	(476)	(405)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021
Operating activities:
Net income	$ 7,389		$ 8,866
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred financing costs and debt discount	33		41
Depreciation and amortization	1,624		1,715	[1]
Pension and other postretirement benefits, net	117		(34)
Deferred income taxes	(92)		(49)
Net gain on disposal of assets	(21)		(3)
Income from equity method investments	(289)		(184)
Distributions from equity method investments	336		303
Income from discontinued operations	0		(8,448)
Changes in income tax receivable	11		20
Changes in the fair value of derivative instruments	(169)		(1)
Changes in:
Current receivables	(6,282)		(3,947)
Inventories	(2,979)		(880)
Current accounts payable and accrued liabilities	10,106		4,477
Right of use assets and operating lease liabilities, net	2		4
All other, net	(277)		(79)
Cash provided by operating activities - continuing operations	9,509		1,801
Cash provided by (used in) operating activities - discontinued operations	(44)		33
Net cash provided by operating activities	9,465		1,834
Investing activities:
Additions to property, plant and equipment	(993)		(606)
Acquisitions, net of cash acquired	(74)		0
Disposal of assets	72		81
Investments – acquisitions and contributions	(160)		(113)
Investments - redemptions, repayments and return of capital	0		3
Purchases of short-term investments	(2,581)		(5,417)
Sales of short-term investments	1,075		0
Maturities of short-term investments	2,811		0
All other, net	470		220
Cash provided by (used in) investing activities - continuing operations	620		(5,832)
Cash provided by investing activities - discontinued operations	0		21,235
Net cash provided by investing activities	620		15,403
Financing activities:
Commercial paper – issued	0		7,414
Commercial paper - repayments	0		(8,437)
Long-term debt – borrowings	2,385		10,775
Long-term debt – repayments	(1,237)		(13,056)
Debt issuance costs	(16)		0
Issuance of common stock	167		53
Common stock repurchased	(6,177)		(984)
Dividends paid	(643)		(760)
Distributions to noncontrolling interests	(599)		(613)
Repurchases of noncontrolling interests	(135)		(310)
All other, net	(41)		(36)
Net cash used in financing activities	(6,296)		(5,954)
Net change in cash, cash equivalents and restricted cash	3,789		11,283
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning balance	5,294	[2]	416
Cash, cash equivalents, restricted cash, and restricted cash equivalents, discontinued operations, beginning balance	0		140
Cash, cash equivalents, restricted cash, and restricted cash equivalents, discontinued operations, ending balance	0		0
Cash, cash equivalents, restricted cash and restricted cash equivalents, ending balance	$ 9,083	[2]	$ 11,839

[1]The three and six months ended June 30, 2021 includes $43 million of impairments of long lived assets.[2]Restricted cash is included in other current assets on our consolidated balance sheets.

Consolidated Statements of Equi

Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Consolidated Statements of Equity) - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning balance at Dec. 31, 2020	$ 29,252	$ 10	$ (15,157)	$ 33,208	$ 4,650	$ (512)	$ 7,053
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	44				(242)		286
Dividends declared on common stock	(379)				(379)
Distributions to noncontrolling interests	(300)						(300)
Other comprehensive income (loss)	1					1
Shares returned - stock based compensation			(1)				0
Shares issued - stock based compensation				18
Net shares issued - stock based compensation	17
Equity transactions of MPLX	(124)			(4)			(120)
Ending balance at Mar. 31, 2021	28,511	10	(15,158)	33,222	4,029	(511)	6,919
Beginning balance at Dec. 31, 2020	29,252	10	(15,157)	33,208	4,650	(512)	7,053
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	172
Equity transactions of MPLX				(38)
Ending balance at Jun. 30, 2021	35,725	10	(16,147)	33,238	12,160	(340)	6,804
Beginning balance at Mar. 31, 2021	28,511	10	(15,158)	33,222	4,029	(511)	6,919
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	8,781				8,512		269
Dividends declared on common stock	(381)				(381)
Distributions to noncontrolling interests	(272)						(272)
Other comprehensive income (loss)	171					171
Shares repurchased	(984)		(984)
Shares returned - stock based compensation			(5)
Shares issued - stock based compensation				50
Net shares issued - stock based compensation	47						2
Equity transactions of MPLX	(148)			(34)			(114)
Ending balance at Jun. 30, 2021	35,725	10	(16,147)	33,238	12,160	(340)	6,804
Beginning balance at Dec. 31, 2021	32,616	10	(19,904)	33,262	12,905	(67)	6,410
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,151				845		306
Dividends declared on common stock	(330)				(330)
Distributions to noncontrolling interests	(290)						(290)
Other comprehensive income (loss)	(7)					(7)
Shares repurchased	(2,807)		(2,807)
Shares returned - stock based compensation			0				(1)
Shares issued - stock based compensation				90
Net shares issued - stock based compensation	89
Equity transactions of MPLX	(88)			(25)			(63)
Ending balance at Mar. 31, 2022	30,334	10	(22,711)	33,327	13,420	(74)	6,362
Beginning balance at Dec. 31, 2021	32,616	10	(19,904)	33,262	12,905	(67)	6,410
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	2
Equity transactions of MPLX				(45)
Ending balance at Jun. 30, 2022	32,704	10	(26,000)	33,378	18,983	(65)	6,398
Beginning balance at Mar. 31, 2022	30,334	10	(22,711)	33,327	13,420	(74)	6,362
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,196				5,873		323
Dividends declared on common stock	(310)				(310)
Distributions to noncontrolling interests	(267)						(267)
Other comprehensive income (loss)	9					9
Shares repurchased	(3,285)		(3,285)
Shares returned - stock based compensation			(4)
Shares issued - stock based compensation				71
Net shares issued - stock based compensation	69						2
Equity transactions of MPLX	(42)			(20)			(22)
Ending balance at Jun. 30, 2022	$ 32,704	$ 10	$ (26,000)	$ 33,378	$ 18,983	$ (65)	$ 6,398

Consolidated Statements of Eq_2

Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Shares of Common Stock) - shares shares in Millions	Total	Common Stock
Beginning balance at Dec. 31, 2020		980
Number of common shares issued - stock compensation		1
Ending balance at Mar. 31, 2021		981
Number of common shares issued - stock compensation		2
Ending balance at Jun. 30, 2021		983
Beginning balance at Dec. 31, 2021	984	984
Number of common shares issued - stock compensation		3
Ending balance at Mar. 31, 2022		987
Number of common shares issued - stock compensation		2
Ending balance at Jun. 30, 2022	989	989

Consolidated Statements of Eq_3

Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Shares of Treasury Stock) - shares shares in Millions	Total	Treasury Stock
Beginning balance at Dec. 31, 2020		(329)
Number of shares returned - stock compensation		0
Ending balance at Mar. 31, 2021		(329)
Beginning balance at Dec. 31, 2020		(329)
Number of shares repurchased	(16)
Ending balance at Jun. 30, 2021		(345)
Beginning balance at Mar. 31, 2021		(329)
Number of shares repurchased	(16)	(16)
Number of shares returned - stock compensation		0
Ending balance at Jun. 30, 2021		(345)
Beginning balance at Dec. 31, 2021	(405)	(405)
Number of shares repurchased		(37)
Number of shares returned - stock compensation		0
Ending balance at Mar. 31, 2022		(442)
Beginning balance at Dec. 31, 2021	(405)	(405)
Number of shares repurchased	(71)
Ending balance at Jun. 30, 2022	(476)	(476)
Beginning balance at Mar. 31, 2022		(442)
Number of shares repurchased	(34)	(34)
Number of shares returned - stock compensation		0
Ending balance at Jun. 30, 2022	(476)	(476)

Consolidated Statements of Eq_4

Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Redeemable Noncontrolling Interest) - USD ($) $ in Millions	Total	Redeemable Non-controlling Interest
Beginning balance at Dec. 31, 2020		$ 968
Net income attributable to redeemable noncontrolling interest		20
Distributions to noncontrolling interests		(20)
Ending balance at Mar. 31, 2021		968
Beginning balance at Dec. 31, 2020		968
Net income attributable to redeemable noncontrolling interest	$ 41
Ending balance at Jun. 30, 2021		968
Beginning balance at Mar. 31, 2021		968
Net income attributable to redeemable noncontrolling interest	21	21
Distributions to noncontrolling interests		(21)
Ending balance at Jun. 30, 2021		968
Beginning balance at Dec. 31, 2021	965	965
Net income attributable to redeemable noncontrolling interest		21
Distributions to noncontrolling interests		(21)
Ending balance at Mar. 31, 2022		965
Beginning balance at Dec. 31, 2021	965	965
Net income attributable to redeemable noncontrolling interest	42
Ending balance at Jun. 30, 2022	965	965
Beginning balance at Mar. 31, 2022		965
Net income attributable to redeemable noncontrolling interest	21	21
Distributions to noncontrolling interests		(21)
Ending balance at Jun. 30, 2022	$ 965	$ 965

Consolidated Statements of Eq_5

Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
Dividends declared per share of common stock (in dollars per share)	$ 0.58	$ 0.58	$ 0.58	$ 0.58

Description of the Business and

Description of the Business and Basis of Presentation	6 Months Ended
Description of the Business and Basis of Presentation	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business and Basis of Presentation	DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION Description of the Business We are a leading, integrated, downstream energy company headquartered in Findlay, Ohio. We operate the nation's largest refining system. We sell refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market and to independent entrepreneurs who operate branded outlets. We also sell transportation fuel to consumers through direct dealer locations under long-term supply contracts. MPC’s midstream operations are primarily conducted through MPLX LP (“MPLX”), which owns and operates crude oil and light product transportation and logistics infrastructure as well as gathering, processing and fractionation assets. We own the general partner and a majority limited partner interest in MPLX. See Note 5. Basis of Presentation All significant intercompany transactions and accounts have been eliminated. These interim consolidated financial statements are unaudited; however, in the opinion of our management, these statements reflect all adjustments necessary for a fair statement of the results for the periods reported. All such adjustments are of a normal, recurring nature unless otherwise disclosed. These interim consolidated financial statements, including the notes, have been prepared in accordance with the rules of the SEC applicable to interim period financial statements and do not include all of the information and disclosures required by GAAP for complete financial statements. Certain information and disclosures derived from our audited annual financial statements, prepared in accordance with GAAP, have been condensed or omitted from these interim financial statements. These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2021. The results of operations for the three and six months ended June 30, 2022 are not necessarily indicative of the results to be expected for the full year.

Accounting Standards

Accounting Standards	6 Months Ended
Accounting Standards	Jun. 30, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Standards	ACCOUNTING STANDARDS Recently Adopted ASU 2021-10, Government Assistance (Topic 832): Disclosures by Business Entities about Government Assistance In November 2021, the FASB issued guidance requiring disclosures for certain types of government assistance that have been accounted for by analogy to grant or contribution models. Disclosures will include information about the type of transactions, accounting and the impact on financial statements. We prospectively adopted this standard in the first quarter of 2022. The adoption of this standard did not have a material impact on our financial statements or disclosures.

Short-term Investments

Short-term Investments	6 Months Ended
Short-term Investments	Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Short-term Investments	SHORT-TERM INVESTMENTS Investments Components The components of investments were as follows: June 30, 2022 (In millions) Fair Value Level Amortized Cost Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Short-term Investments Available-for-sale debt securities Commercial paper Level 2 $ 3,300 $ — $ (6) $ 3,294 $ 583 $ 2,711 Certificates of deposit and time deposits Level 2 5,313 — (4) 5,309 3,830 1,479 U.S. government securities Level 1 23 — — 23 — 23 Corporate notes and bonds Level 2 28 — — 28 — 28 Total available-for-sale debt securities $ 8,664 $ — $ (10) $ 8,654 $ 4,413 $ 4,241 Cash 4,665 4,665 — Total $ 13,319 $ 9,078 $ 4,241 December 31, 2021 (In millions) Fair Value Level Amortized Cost Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Short-term Investments Available-for-sale debt securities Commercial paper Level 2 $ 4,905 $ — $ (1) $ 4,904 $ 868 $ 4,036 Certificates of deposit and time deposits Level 2 2,024 — — 2,024 750 1,274 U.S. government securities Level 1 28 — — 28 — 28 Corporate notes and bonds Level 2 271 — — 271 61 210 Total available-for-sale debt securities $ 7,228 $ — $ (1) $ 7,227 $ 1,679 $ 5,548 Cash 3,612 3,612 — Total $ 10,839 $ 5,291 $ 5,548 Our investment policy includes concentration limits and credit rating requirements which limits our investments to high quality, short term and highly liquid securities. Unrealized losses on debt investments held from May 14, 2021, which coincides with the sale of Speedway, to June 30, 2022 were not material. Realized gains/losses were not material. All of our available-for-sale debt securities held as of June 30, 2022 mature within one year or less or are readily available for use.

Discontinued Operations

Discontinued Operations	6 Months Ended
Discontinued Operations	Jun. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS On May 14, 2021, we completed the sale of Speedway, our company-owned and operated retail transportation fuel and convenience store business, to 7-Eleven for cash proceeds of approximately $21.38 billion. After-tax proceeds were approximately $17.22 billion. This transaction resulted in a pretax gain of $11.68 billion ($8.02 billion after income taxes) after deducting the book value of the net assets and certain other adjustments. The proceeds and related Speedway sale gain may be adjusted in future periods based on provisions of the purchase and sale agreement that allow for adjustments of working capital amounts and other miscellaneous items subsequent to the transaction closing date of May 14, 2021. Results of operations for Speedway are reflected through the close of the sale. The following table presents Speedway results and the gain on sale as reported in income from discontinued operations, net of tax, within our consolidated statements of income. Three Months Ended Six Months Ended (In millions) June 30, 2021 Revenues, other income and net gain on disposal of assets: Revenues and other income $ 3,081 $ 8,420 Net gain on disposal of assets 11,682 11,682 Total revenues, other income and net gain on disposal of assets 14,763 20,102 Costs and expenses: Cost of revenues (excludes items below) 2,748 7,654 Depreciation and amortization 1 3 Selling, general and administrative expenses 48 121 Other taxes 24 75 Total costs and expenses 2,821 7,853 Income from operations 11,942 12,249 Net interest and other financial costs 2 6 Income before income taxes 11,940 12,243 Provision for income taxes 3,726 3,795 Income from discontinued operations, net of tax $ 8,214 $ 8,448

Master Limited Partnership

Master Limited Partnership	6 Months Ended
Master Limited Partnership	Jun. 30, 2022
Noncontrolling Interest [Abstract]
Master Limited Partnership	MASTER LIMITED PARTNERSHIP We own the general partner and a majority limited partner interest in MPLX, which owns and operates crude oil and light product transportation and logistics infrastructure as well as gathering, processing and fractionation assets. We control MPLX through our ownership of the general partner interest. As of June 30, 2022, we owned approximately 64 percent of the outstanding MPLX common units. Unit Repurchase Program On November 2, 2020, MPLX announced the board authorization of a unit repurchase program for the repurchase of up to $1.0 billion of MPLX’s outstanding common units held by the public. Total unit repurchases were as follows for the respective periods: Three Months Ended Six Months Ended (In millions, except per share data) 2022 2021 2022 2021 Number of common units repurchased 1 6 4 12 Cash paid for common units repurchased $ 35 $ 155 $ 135 $ 310 Average cost per unit $ 33.74 $ 27.40 $ 32.48 $ 26.02 As of June 30, 2022, MPLX had $202 million remaining under its unit repurchase authorization. Agreements We have various long-term, fee-based commercial agreements with MPLX. Under these agreements, MPLX provides transportation, storage, distribution and marketing services to us. With certain exceptions, these agreements generally contain minimum volume commitments. These transactions are eliminated in consolidation but are reflected as intersegment transactions between our Refining & Marketing and Midstream segments. We also have agreements with MPLX that establish fees for operational and management services provided between us and MPLX and for executive management services and certain general and administrative services provided by us to MPLX. These transactions are eliminated in consolidation but are reflected as intersegment transactions between our Corporate and Midstream segments. Noncontrolling Interest As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows: Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Decrease due to change in ownership $ (13) $ (41) $ (50) $ (76) Tax impact (7) 7 5 38 Decrease in MPC's additional paid-in capital, net of tax $ (20) $ (34) $ (45) $ (38)

Variable Interest Entities

Variable Interest Entities	6 Months Ended
Variable Interest Entities	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES Consolidated VIE We control MPLX through our ownership of its general partner. MPLX is a VIE because the limited partners do not have substantive kick-out or participating rights over the general partner. We are the primary beneficiary of MPLX because in addition to our significant economic interest, we also have the ability, through our ownership of the general partner, to control the decisions that most significantly impact MPLX. We therefore consolidate MPLX and record a noncontrolling interest for the interest owned by the public. We also record a redeemable noncontrolling interest related to MPLX’s Series A preferred units. The creditors of MPLX do not have recourse to MPC’s general credit through guarantees or other financial arrangements, except as noted. MPC has effectively guaranteed certain indebtedness of LOOP LLC (“LOOP”) and LOCAP LLC (“LOCAP”), in which MPLX holds an interest. See Note 23 for more information. The assets of MPLX can only be used to settle its own obligations and its creditors have no recourse to our assets, except as noted earlier. The following table presents balance sheet information for the assets and liabilities of MPLX, which are included in our balance sheets. (In millions) June 30, December 31, Assets Cash and cash equivalents $ 298 $ 13 Receivables, less allowance for doubtful accounts 798 660 Inventories 157 142 Other current assets 46 55 Equity method investments 4,099 3,981 Property, plant and equipment, net 19,767 20,042 Goodwill 7,645 7,657 Right of use assets 300 268 Other noncurrent assets 817 891 Liabilities Accounts payable $ 808 $ 671 Payroll and benefits payable 3 6 Accrued taxes 86 75 Debt due within one year 1,000 499 Operating lease liabilities 45 59 Other current liabilities 442 304 Long-term debt 18,775 18,072 Deferred income taxes 14 10 Long-term operating lease liabilities 250 205 Deferred credits and other liabilities 602 559

Related Party Transactions

Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2022
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS Transactions with related parties were as follows: Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Sales to related parties $ 21 $ 11 $ 40 $ 54 Purchases from related parties 297 219 579 422 Sales to related parties, which are included in sales and other operating revenues, consist primarily of refined product sales to certain of our equity affiliates.

Earnings Per Share

Earnings Per Share	6 Months Ended
Earnings Per Share	Jun. 30, 2022
Earnings Per Share [Abstract]
Earnings (Loss) per Share	EARNINGS PER SHARE Three Months Ended Six Months Ended (In millions, except per share data) 2022 2021 2022 2021 Income from continuing operations, net of tax $ 6,217 $ 588 $ 7,389 $ 418 Less: Net income attributable to noncontrolling interest 344 290 671 596 Net income allocated to participating securities 3 — 3 — Income (loss) from continuing operations available to common stockholders 5,870 298 6,715 (178) Income from discontinued operations, net of tax — 8,214 — 8,448 Income available to common stockholders $ 5,870 $ 8,512 $ 6,715 $ 8,270 Weighted average common shares outstanding: Basic 532 650 549 651 Effect of dilutive securities 4 4 4 — Diluted 536 654 553 651 Income available to common stockholders per share: Basic: Continuing operations $ 11.03 $ 0.46 $ 12.24 $ (0.27) Discontinued operations — 12.63 — 12.98 Net income per share $ 11.03 $ 13.09 $ 12.24 $ 12.71 Diluted: Continuing operations $ 10.95 $ 0.45 $ 12.15 $ (0.27) Discontinued operations — 12.55 — 12.98 Net income per share $ 10.95 $ 13.00 $ 12.15 $ 12.71 The following table summarizes the shares that were anti-dilutive and, therefore, were excluded from the diluted share calculation. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Shares issuable under stock-based compensation plans — 3 — 8

Equity

Equity	6 Months Ended
Equity	Jun. 30, 2022
Equity [Abstract]
Equity	EQUITY On February 2, 2022, we announced our board of directors approved an incremental $5.0 billion share repurchase authorization. The authorization has no expiration date. We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, tender offers, accelerated share repurchases or open market solicitations for shares, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be suspended or discontinued at any time. Total share repurchases were as follows for the respective periods: Three Months Ended Six Months Ended (In millions, except per share data) 2022 2021 2022 2021 Number of shares repurchased 34 16 71 16 Cash paid for shares repurchased $ 3,331 $ 984 $ 6,177 $ 984 Average cost per share $ 95.46 $ 63.00 $ 85.31 $ 63.00

Segment Information

Segment Information	6 Months Ended
Segment Information	Jun. 30, 2022
Segment Reporting [Abstract]
Segment Information	SEGMENT INFORMATION We have two reportable segments: Refining & Marketing and Midstream. Each of these segments is organized and managed based upon the nature of the products and services it offers. • Refining & Marketing – refines crude oil and other feedstocks, including renewable feedstocks, at our refineries in the Gulf Coast, Mid-Continent and West Coast regions of the United States, purchases refined products and ethanol for resale and distributes refined products, including renewable diesel, through transportation, storage, distribution and marketing services provided largely by our Midstream segment. We sell refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market, to independent entrepreneurs who operate primarily Marathon ® branded outlets and through long-term fuel supply contracts with direct dealers who operate locations mainly under the ARCO ® brand. • Midstream – transports, stores, distributes and markets crude oil and refined products principally for the Refining & Marketing segment via refining logistics assets, pipelines, terminals, towboats and barges; gathers, processes and transports natural gas; and gathers, transports, fractionates, stores and markets NGLs. The Midstream segment primarily reflects the results of MPLX. During the first quarter of 2022, our chief operating decision maker (“CODM”) began to evaluate the performance of our segments using segment adjusted EBITDA. We have modified our presentation of segment performance to be consistent with this change, including prior periods presented for consistent and comparable presentation. Amounts included in income from continuing operations before income taxes and excluded from segment adjusted EBITDA include: (i) depreciation and amortization; (ii) net interest and other financial costs; (iii) turnaround expenses and (iv) other adjustments as deemed necessary. These items are either: (i) believed to be non-recurring in nature; (ii) not believed to be allocable or controlled by the segment; or (iii) are not tied to the operational performance of the segment. Assets by segment are not a measure used to assess the performance of the company by the CODM and thus are not reported in our disclosures. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Segment adjusted EBITDA for reportable segments Refining & Marketing $ 7,760 $ 751 $ 9,134 $ 774 Midstream 1,456 1,308 2,859 2,630 Total reportable segments $ 9,216 $ 2,059 $ 11,993 $ 3,404 Reconciliation of segment adjusted EBITDA for reportable segments to income from continuing operations before income taxes Total reportable segments $ 9,216 $ 2,059 $ 11,993 $ 3,404 Corporate (156) (149) (294) (274) Refining planned turnaround costs (151) (61) (296) (173) Storm impacts — — — (47) Renewable volume obligation requirements 238 — 238 — Litigation — — 27 — Impairments (a) — (13) — (13) Depreciation and amortization (b) (819) (871) (1,624) (1,715) Net interest and other financial costs (312) (372) (574) (725) Income from continuing operations before income taxes $ 8,016 $ 593 $ 9,470 $ 457 (a) Impairment of equity method investments. (b) The three and six months ended June 30, 2021 includes $43 million of impairments of long lived assets. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Sales and other operating revenues Refining & Marketing Revenues from external customers (a) $ 52,300 $ 28,554 $ 89,092 $ 50,215 Intersegment revenues 47 30 83 58 Refining & Marketing segment revenues 52,347 28,584 89,175 50,273 Midstream Revenues from external customers (a) 1,495 1,061 2,761 2,111 Intersegment revenues 1,308 1,248 2,555 2,447 Midstream segment revenues 2,803 2,309 5,316 4,558 Total segment revenues 55,150 30,893 94,491 54,831 Less: intersegment revenues 1,355 1,278 2,638 2,505 Consolidated sales and other operating revenues (a) $ 53,795 $ 29,615 $ 91,853 $ 52,326 (a) Includes related party sales. See Note 7 for additional information. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Income (loss) from equity method investments Refining & Marketing $ 6 $ 14 $ 18 $ 19 Midstream 141 92 271 178 Corporate (a) — (13) — (13) Consolidated income from equity method investments $ 147 $ 93 $ 289 $ 184 Depreciation and amortization Refining & Marketing $ 475 $ 466 $ 936 $ 944 Midstream 330 331 661 665 Corporate 14 74 27 106 Consolidated depreciation and amortization $ 819 $ 871 $ 1,624 $ 1,715 Capital expenditures Refining & Marketing $ 315 $ 176 $ 559 $ 310 Midstream 222 178 505 316 Segment capital expenditures and investments 537 354 1,064 626 Less investments in equity method investees 48 62 160 113 Plus: Corporate 15 23 38 44 Capitalized interest 25 16 48 30 Consolidated capital expenditures (b) $ 529 $ 331 $ 990 $ 587 (a) Impairment of equity method investment. (b) Includes changes in capital expenditure accruals. See Note 20 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2022 and 2021 as reported in the consolidated statements of cash flows.

Net Interest and Other Financia

Net Interest and Other Financial Costs	6 Months Ended
Net Interest and Other Financial Costs	Jun. 30, 2022
Other Income and Expenses [Abstract]
Net Interest and Other Financial Costs	NET INTEREST AND OTHER FINANCIAL COSTS Net interest and other financial costs were as follows: Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Interest income $ (18) $ (2) $ (23) $ (3) Interest expense 324 337 634 688 Interest capitalized (25) (19) (48) (36) Pension and other postretirement non-service costs (a) 32 56 11 56 Other financial costs (credits) (1) — — 20 Net interest and other financial costs $ 312 $ 372 $ 574 $ 725 (a) See Note 22.

Income Taxes

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES We recorded a combined federal, state and foreign income tax provision of $1.799 billion and $2.081 billion for the three and six months ended June 30, 2022, respectively, which was higher than the tax computed at the U.S. statutory rate primarily due to state taxes offset by net income attributable to noncontrolling interests. We recorded a combined federal, state and foreign income tax provision of $5 million and $39 million for the three and six months ended June 30, 2021, respectively, which was lower than the tax computed at the U.S. statutory rate primarily due to income attributable to noncontrolling interests.

Inventories

Inventories	6 Months Ended
Inventories	Jun. 30, 2022
Inventory Disclosure [Abstract]
Inventories	INVENTORIES (In millions) June 30, December 31, Crude oil $ 4,174 $ 2,639 Refined products 5,814 4,460 Materials and supplies 1,060 956 Total $ 11,048 $ 8,055

Equity Method Investments

Equity Method Investments	6 Months Ended
Equity Method Investments	Jun. 30, 2022
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	EQUITY METHOD INVESTMENTSOn June 1, 2022, MPC purchased the remaining 49 percent interest in Watson Cogeneration Company from NRG Energy, Inc. for approximately $59 million. This entity will now be consolidated and included in our consolidated results. It was previously accounted for as an equity method investment.The excess of the estimated $62 million fair value over the $25 million book value of our 51 percent ownership interest in Watson Cogeneration Company resulted in a $37 million non-cash gain, which is included in the net gain on disposal of assets line of the accompanying consolidated statements of income.

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
Property, Plant and Equipment	Jun. 30, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT June 30, 2022 December 31, 2021 (In millions) Gross Accumulated Depreciation Net Gross Accumulated Depreciation Net Refining & Marketing $ 32,147 $ 16,018 $ 16,129 $ 31,089 $ 14,876 $ 16,213 Midstream 28,325 7,904 20,421 28,098 7,384 20,714 Corporate 1,470 958 512 1,446 933 513 Total $ 61,942 $ 24,880 $ 37,062 $ 60,633 $ 23,193 $ 37,440

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 Fair Values—Recurring The following tables present assets and liabilities accounted for at fair value on a recurring basis as of June 30, 2022 and December 31, 2021 by fair value hierarchy level. We have elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty, including any related cash collateral as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the following tables. June 30, 2022 Fair Value Hierarchy (In millions) Level 1 Level 2 Level 3 Netting and Collateral (a) Net Carrying Value on Balance Sheet (b) Collateral Pledged Not Offset Assets: Commodity contracts $ 761 $ — $ — $ (620) $ 141 $ 79 Liabilities: Commodity contracts $ 622 $ — $ — $ (622) $ — $ — Embedded derivatives in commodity contracts — — 92 — 92 — December 31, 2021 Fair Value Hierarchy (In millions) Level 1 Level 2 Level 3 Netting and Collateral (a) Net Carrying Value on Balance Sheet (b) Collateral Pledged Not Offset Assets: Commodity contracts $ 270 $ 1 $ — $ (235) $ 36 $ 34 Liabilities: Commodity contracts $ 248 $ 1 $ — $ (249) $ — $ — Embedded derivatives in commodity contracts — — 108 — 108 — (a) Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2022, cash collateral of $2 million was netted with the mark-to-market derivative liabilities. As of December 31, 2021, cash collateral of $14 million was netted with mark-to-market derivative liabilities. (b) We have no derivative contracts that are covered by master netting arrangements reflected gross on the balance sheet. Level 3 instruments include embedded derivatives in commodity contracts. The embedded derivative liability relates to a natural gas purchase agreement embedded in a keep‑whole processing agreement. The fair value calculation for these Level 3 instruments at June 30, 2022 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.72 to $1.98 per gallon with a weighted average of $0.98 per gallon and (2) the probability of renewal of 100 percent for the five The following is a reconciliation of the beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Beginning balance $ 99 $ 66 $ 108 $ 63 Unrealized and realized (gain)/loss included in net income (4) 39 (8) 45 Settlements of derivative instruments (3) (3) (8) (6) Ending balance $ 92 $ 102 $ 92 $ 102 The amount of total (gain)/loss for the period included in earnings attributable to the change in unrealized losses relating to liabilities still held at the end of period: $ (3) $ 39 $ (8) $ 41 Fair Values – Reported We believe the carrying value of our other financial instruments, including cash and cash equivalents, receivables, accounts payable and certain accrued liabilities, approximate fair value. Our fair value assessment incorporates a variety of considerations, including the short-term duration of the instruments and the expected insignificance of bad debt expense, which includes an evaluation of counterparty credit risk. The borrowings under our revolving credit facilities, which include variable interest rates, approximate fair value. The fair value of our long-term debt is based on prices from recent trade activity and is categorized in level 3 of the fair value hierarchy. The carrying and fair values of our debt were approximately $26.3 billion and $24.7 billion at June 30, 2022, respectively, and approximately $25.1 billion and $28.1 billion at December 31, 2021, respectively. These carrying and fair values of our debt exclude the unamortized issuance costs which are netted against our total debt.

Derivatives

Derivatives	6 Months Ended
Derivatives	Jun. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	DERIVATIVES For further information regarding the fair value measurement of derivative instruments, including any effect of master netting agreements or collateral, see Note 16. We do not designate any of our commodity derivative instruments as hedges for accounting purposes. Derivatives that are not designated as accounting hedges may include commodity derivatives used to hedge price risk on (1) inventories, (2) fixed price sales of refined products, (3) the acquisition of foreign-sourced crude oil, (4) the acquisition of ethanol for blending with refined products, (5) the sale of NGLs, (6) the purchase of natural gas and (7) the purchase of soybean oil. The following table presents the fair value of derivative instruments as of June 30, 2022 and December 31, 2021 and the line items in the balance sheets in which the fair values are reflected. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under the terms of our master netting arrangements including cash collateral on deposit with, or received from, brokers. We offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements when a legal right of offset exists. As a result, the asset and liability amounts below will not agree with the amounts presented in our consolidated balance sheets. (In millions) June 30, 2022 December 31, 2021 Balance Sheet Location Asset Liability Asset Liability Commodity derivatives Other current assets $ 761 $ 622 $ 271 $ 249 Other current liabilities (a) — 14 — 15 Deferred credits and other liabilities (a) — 78 — 93 (a) Includes embedded derivatives. The table below summarizes open commodity derivative contracts for crude oil, refined products, blending products and soybean oil as of June 30, 2022. Percentage of contracts that expire next quarter Position (Units in thousands of barrels) Long Short Exchange-traded (a) Crude oil 75.6% 95,368 103,520 Refined products 89.6% 13,539 15,813 Blending products 75.6% 2,966 6,887 Soybean oil 84.0% 3,738 4,342 (a) Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 20,607 long and 21,937 short; Refined products - 1,181 long and 890 short. There are no spread contracts for blending products or soybean oil. The following table summarizes the effect of all commodity derivative instruments in our consolidated statements of income: Gain (Loss) (In millions) Three Months Ended Six Months Ended Income Statement Location 2022 2021 2022 2021 Sales and other operating revenues $ — $ (5) $ — $ (15) Cost of revenues 17 (168) (325) (233) Other income (1) — 1 — Total $ 16 $ (173) $ (324) $ (248)

Debt

Debt	6 Months Ended
Debt	Jun. 30, 2022
Debt Disclosure [Abstract]
Debt	DEBT Our outstanding borrowings at June 30, 2022 and December 31, 2021 consisted of the following: (In millions) June 30, December 31, Marathon Petroleum Corporation: Senior notes $ 6,449 $ 6,449 Notes payable 1 1 Finance lease obligations 620 589 Total $ 7,070 $ 7,039 MPLX LP: Bank revolving credit facility — 300 Senior notes 20,100 18,600 Finance lease obligations 8 9 Total $ 20,108 $ 18,909 Total debt $ 27,178 $ 25,948 Unamortized debt issuance costs (140) (129) Unamortized (discount) premium, net (264) (280) Amounts due within one year (1,087) (571) Total long-term debt due after one year $ 25,687 $ 24,968 MPLX Senior Notes On March 14, 2022, MPLX issued $1.5 billion aggregate principal amount of 4.950% senior notes due March 2052 in an underwritten public offering. The net proceeds were used to repay amounts outstanding under the MPC intercompany loan agreement and the MPLX credit agreement. Available Capacity under our Credit Facilities as of June 30, 2022 (Dollars in millions) Total Outstanding Outstanding Available Weighted Expiration MPC, excluding MPLX MPC bank revolving credit facility $ 5,000 $ — $ 1 $ 4,999 — % October 2023 MPC trade receivables securitization facility (a) 100 — 100 — — September 2022 MPLX MPLX bank revolving credit facility 3,500 — — 3,500 — % July 2024 (a) The committed borrowing and letter of credit issuance capacity of the trade receivables securitization facility is $100 million. In addition, the facility allows for the issuance of letters of credit in excess of the committed capacity at the discretion of the issuing banks. As of June 30, 2022, letters of credit in the total amount of $358 million were issued and outstanding under the facility to secure contracts awarded by the Department of Energy to purchase crude oil from the Strategic Petroleum Reserve. In July 2022, the trade receivables securitization facility was amended to, among other things, extend its term until September 29, 2023. MPC Bank Revolving Credit Facility On July 7, 2022, MPC entered into a new five-year revolving credit agreement (the “New MPC Credit Agreement”) to replace its previous $5.0 billion credit facility that was scheduled to expire in October 2023. The New MPC Credit Agreement, among other things, provides for a $5.0 billion unsecured revolving credit facility that matures in July 2027. The financial covenants of the New MPC Credit Agreement are substantially the same as those contained in the previous credit agreement. Borrowings under the New MPC Credit Agreement bear interest, at MPC’s election, at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the New MPC Credit Agreement, plus an applicable margin. MPLX Bank Revolving Credit Facility On July 7, 2022, MPLX entered into a new five-year revolving credit agreement (the “New MPLX Credit Agreement”) to replace its previous $3.5 billion credit facility that was scheduled to expire in July 2024. The New MPLX Credit Agreement, among other things, provides for a $2.0 billion unsecured revolving credit facility that matures in July 2027. The New MPLX Credit Agreement also provides for letter of credit issuing capacity under the facility of $150 million. Letters of credit issuing capacity is included in, not in addition to, the $2.0 billion borrowing capacity of the New MPLX Credit Agreement. The financial covenants of the New MPLX Credit Agreement are substantially the same as those contained in the previous credit agreement. Borrowings under the MPLX Credit Agreement bear interest, at MPLX’s election, at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the MPLX Credit Agreement, plus an applicable margin.

Revenue

Revenue	6 Months Ended
Revenue	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE The following table presents our revenues from external customers disaggregated by segment and product line. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Refining & Marketing: Refined products $ 48,864 $ 26,528 $ 82,457 $ 46,337 Crude oil 2,976 1,866 5,865 3,312 Services and other 460 160 770 566 Total revenues from external customers 52,300 28,554 89,092 50,215 Midstream: Refined products 698 304 1,195 586 Services and other 797 757 1,566 1,525 Total revenues from external customers 1,495 1,061 2,761 2,111 Sales and other operating revenues $ 53,795 $ 29,615 $ 91,853 $ 52,326 We do not disclose information on the future performance obligations for any contract with expected duration of one year or less at inception. As of June 30, 2022, we do not have future performance obligations that are material to future periods. Receivables On the accompanying consolidated balance sheets, receivables, less allowance for doubtful accounts primarily consists of customer receivables. Significant, non-customer balances included in our receivables at June 30, 2022 include matching buy/sell receivables of $7.81 billion.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	6 Months Ended
Supplemental Cash Flow Information	Jun. 30, 2022
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	SUPPLEMENTAL CASH FLOW INFORMATION Six Months Ended (In millions) 2022 2021 Net cash provided by operating activities included: Interest paid (net of amounts capitalized) $ 519 $ 649 Net income taxes paid to (received from) taxing authorities 1,123 319 Non-cash investing and financing activities: Book value of equity method investment (a) 25 — (a) Represents the book value of MPC’s equity method investment in Watson Cogeneration Company at June 1, 2022 prior to MPC buying out the remaining interest in Watson Cogeneration Company. See Note 14 for additional information. The consolidated statements of cash flows exclude changes to the consolidated balance sheets that did not affect cash. The following is a reconciliation of additions to property, plant and equipment to total capital expenditures: Six Months Ended (In millions) 2022 2021 Additions to property, plant and equipment per the consolidated statements of cash flows $ 993 $ 606 Decrease in capital accruals (3) (19) Total capital expenditures $ 990 $ 587

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended
Accumulated Other Comprehensive Loss	Jun. 30, 2022
Equity [Abstract]
Accumulated Other Comprehensive Loss	ACCUMULATED OTHER COMPREHENSIVE LOSS The following table shows the changes in accumulated other comprehensive loss by component. Amounts in parentheses indicate debits. (In millions) Pension Benefits Other Benefits Other Total Balance as of December 31, 2020 $ (338) $ (181) $ 7 $ (512) Other comprehensive gain (loss) before reclassifications, net of tax of $44 132 1 (4) 129 Amounts reclassified from accumulated other comprehensive loss: Amortization of prior service cost (credit) (a) (23) 1 — (22) Amortization of actuarial loss (a) 24 5 — 29 Settlement loss (a) 49 — — 49 Tax effect (11) (2) — (13) Other comprehensive income (loss) 171 5 (4) 172 Balance as of June 30, 2021 $ (167) $ (176) $ 3 $ (340) (In millions) Pension Benefits Other Benefits Other Total Balance as of December 31, 2021 $ (117) $ 49 $ 1 $ (67) Other comprehensive gain (loss) before reclassifications, net of tax of $(8) (19) 3 (6) (22) Amounts reclassified from accumulated other comprehensive loss: Amortization of prior service credit (a) (23) (11) — (34) Amortization of actuarial loss (a) 7 3 — 10 Settlement loss (a) 56 — — 56 Tax effect (10) 2 — (8) Other comprehensive income (loss) 11 (3) (6) 2 Balance as of June 30, 2022 $ (106) $ 46 $ (5) $ (65) (a) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 22.

Pension and Other Postretiremen

Pension and Other Postretirement Benefits	6 Months Ended
Pension and Other Postretirement Benefits	Jun. 30, 2022
Retirement Benefits [Abstract]
Pension and Other Postretirement Plans	PENSION AND OTHER POSTRETIREMENT BENEFITS The following summarizes the components of net periodic benefit costs: Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Pension Benefits Service cost $ 65 $ 72 $ 133 $ 148 Interest cost 24 23 47 46 Expected return on plan assets (37) (29) (78) (62) Amortization of prior service credit (12) (12) (23) (23) Amortization of actuarial loss 3 14 7 25 Settlement loss 54 49 56 49 Net periodic pension benefit cost $ 97 $ 117 $ 142 $ 183 Other Benefits Service cost $ 5 $ 7 $ 13 $ 17 Interest cost 5 8 10 15 Amortization of prior service cost (credit) (6) — (11) 1 Amortization of actuarial loss 1 3 3 5 Net periodic other benefit cost $ 5 $ 18 $ 15 $ 38 The components of net periodic benefit cost other than the service cost component are included in net interest and other financial costs on the consolidated statements of income. During the six months ended June 30, 2022, we did not make contributions to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $9 million and $31 million, respectively, during the six months ended June 30, 2022.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES We are the subject of, or a party to, a number of pending or threatened legal actions, contingencies and commitments involving a variety of matters, including laws and regulations relating to the environment. Some of these matters are discussed below. For matters for which we have not recorded a liability, we are unable to estimate a range of possible loss because the issues involved have not been fully developed through pleadings, discovery or court proceedings. However, the ultimate resolution of some of these contingencies could, individually or in the aggregate, be material. Environmental Matters We are subject to federal, state, local and foreign laws and regulations relating to the environment. These laws generally provide for control of pollutants released into the environment and require responsible parties to undertake remediation of hazardous waste disposal sites and certain other locations including presently or formerly owned or operated retail marketing sites. Penalties may be imposed for noncompliance. At June 30, 2022 and December 31, 2021, accrued liabilities for remediation totaled $396 million and $401 million, respectively. It is not presently possible to estimate the ultimate amount of all remediation costs that might be incurred or the penalties, if any, that may be imposed. Receivables for recoverable costs from certain states, under programs to assist companies in clean-up efforts related to underground storage tanks at presently or formerly owned or operated retail marketing sites, were $5 million and $6 million at June 30, 2022 and December 31, 2021, respectively. Governmental and other entities in various states have filed climate-related lawsuits against numerous energy companies, including MPC. The lawsuits allege damages as a result of climate change and the plaintiffs are seeking unspecified damages and abatement under various tort theories. We are currently subject to such proceedings in federal or state courts in California, Delaware, Maryland, Hawaii, Rhode Island and South Carolina. Similar lawsuits may be filed in other jurisdictions. At this early stage, the ultimate outcome of these matters remains uncertain, and neither the likelihood of an unfavorable outcome nor the ultimate liability, if any, can be determined. We are involved in a number of environmental enforcement matters arising in the ordinary course of business. While the outcome and impact on us cannot be predicted with certainty, management believes the resolution of these environmental matters will not, individually or collectively, have a material adverse effect on our consolidated results of operations, financial position or cash flows. Other Legal Proceedings In July 2020, Tesoro High Plains Pipeline Company, LLC (“THPP”), a subsidiary of MPLX, received a Notification of Trespass Determination from the Bureau of Indian Affairs (“BIA”) relating to a portion of the Tesoro High Plains Pipeline that crosses the Fort Berthold Reservation in North Dakota. The notification demanded the immediate cessation of pipeline operations and assessed trespass damages of approximately $187 million. On appeal, the Assistant Secretary - Indian Affairs vacated the BIA’s trespass order and remanded to the Regional Director for the BIA Great Plains Region to issue a new decision based on specified criteria. On December 15, 2020, the Regional Director of the BIA issued a new trespass notice to THPP, finding that THPP was in trespass and assessing trespass damages of approximately $4 million (including interest), which has been paid. The order also required that THPP immediately cease and desist use of the portion of the pipeline that crosses the property at issue. THPP has complied with the Regional Director’s December 15, 2020 notice. In March 2021, THPP received a copy of an order purporting to vacate all orders related to THPP’s alleged trespass issued by the BIA between July 2, 2020 and January 14, 2021. The order directs the Regional Director of the BIA to reconsider the issue of THPP’s alleged trespass and issue a new order, if necessary, after all interested parties have had an opportunity to be heard. On April 23, 2021, THPP filed a lawsuit in the District of North Dakota against the United States of America, the U.S. Department of the Interior and the BIA (together, the “U.S. Government Parties”) challenging the March order purporting to vacate all previous orders related to THPP’s alleged trespass. On February 8, 2022, the U.S. Government Parties filed their answer to THPP’s suit, asserting counterclaims for trespass and ejectment. The U.S. Government parties claim THPP is in continued trespass with respect to the pipeline and seek disgorgement of pipeline profits from June 1, 2013 to present, removal of the pipeline and remediation. We intend to vigorously defend ourselves against these counterclaims. We continue to work towards a settlement of this matter with holders of the property rights at issue. We are also a party to a number of other lawsuits and other proceedings arising in the ordinary course of business. While the ultimate outcome and impact to us cannot be predicted with certainty, we believe that the resolution of these other lawsuits and proceedings will not, individually or collectively, have a material adverse effect on our consolidated financial position, results of operations or cash flows. Guarantees We have provided certain guarantees, direct and indirect, of the indebtedness of other companies. Under the terms of most of these guarantee arrangements, we would be required to perform should the guaranteed party fail to fulfill its obligations under the specified arrangements. In addition to these financial guarantees, we also have various performance guarantees related to specific agreements. Guarantees related to indebtedness of equity method investees LOOP and LOCAP MPC and MPLX hold interests in an offshore oil port, LOOP, and MPLX holds an interest in a crude oil pipeline system, LOCAP. Both LOOP and LOCAP have secured various project financings with throughput and deficiency agreements. Under the agreements, MPC, as a shipper, is required to advance funds if the investees are unable to service their debt. Any such advances are considered prepayments of future transportation charges. The duration of the agreements varies but tends to follow the terms of the underlying debt, which extend through 2037. Our maximum potential undiscounted payments under these agreements for the debt principal totaled $171 million as of June 30, 2022. Dakota Access Pipeline MPLX holds a 9.19 percent indirect interest in a joint venture (“Dakota Access”) that owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects, collectively referred to as the Bakken Pipeline system or DAPL. In 2020, the U.S. District Court for the District of Columbia (the “D.D.C.”) ordered the U.S. Army Corps of Engineers (“Army Corps”), which granted permits and an easement for the Bakken Pipeline system, to prepare an environmental impact statement (“EIS”) relating to an easement under Lake Oahe in North Dakota. The D.D.C. later vacated the easement. Completion of the EIS may now be delayed as the Army Corps engages with the Standing Rock Sioux Tribe on the tribe’s reasons for withdrawing as a cooperating agency with respect to preparation of the EIS. In May 2021, the D.D.C. denied a renewed request for an injunction to shut down the pipeline while the EIS is being prepared. In June 2021, the D.D.C. issued an order dismissing without prejudice the tribes’ claims against the Dakota Access Pipeline. The litigation could be reopened or new litigation challenging the EIS, once completed, could be filed. The pipeline remains operational. MPLX has entered into a Contingent Equity Contribution Agreement whereby it, along with the other joint venture owners in the Bakken Pipeline system, has agreed to make equity contributions to the joint venture upon certain events occurring to allow the entities that own and operate the Bakken Pipeline system to satisfy their senior note payment obligations. The senior notes were issued to repay amounts owed by the pipeline companies to fund the cost of construction of the Bakken Pipeline system. If the pipeline were temporarily shut down, MPLX would have to contribute its 9.19 percent pro rata share of funds required to pay interest accruing on the notes and any portion of the principal that matures while the pipeline is shutdown. MPLX also expects to contribute its 9.19 percent pro rata share of any costs to remediate any deficiencies to reinstate the permit and/or return the pipeline into operation. If the vacatur of the easement permit results in a permanent shutdown of the pipeline, MPLX would have to contribute its 9.19 percent pro rata share of the cost to redeem the bonds (including the 1% redemption premium required pursuant to the indenture governing the notes) and any accrued and unpaid interest. As of June 30, 2022, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement were approximately $170 million. Crowley Ocean Partners LLC and Crowley Blue Water Partners LLC In connection with our 50 percent indirect interest in Crowley Ocean Partners LLC, we have agreed to conditionally guarantee our portion of the obligations of the joint venture and its subsidiaries under a senior secured term loan used to finance the acquisition of four product tankers. MPC’s liability under the guarantee for each vessel is conditioned upon the occurrence of certain events, including if we cease to maintain an investment grade credit rating or the charter for the relevant product tanker ceases to be in effect and is not replaced by a charter with an investment grade company on certain defined commercial terms. During the first quarter of 2022, the guarantee for the debt associated with one of the four vessels became effective upon the expiration of the charter for the relevant vessel. As of June 30, 2022, our maximum potential undiscounted payments under this agreement for debt principal totaled $103 million. In connection with our 50 percent indirect interest in Crowley Blue Water Partners LLC, we have agreed to provide a conditional guarantee of up to 50 percent of its outstanding debt balance in the event there is no charter agreement in place with an investment grade customer for the entity’s three vessels as well as other financial support in certain circumstances. As of June 30, 2022, our maximum potential undiscounted payments under this arrangement was $104 million. Other guarantees We have entered into other guarantees with maximum potential undiscounted payments totaling $98 million as of June 30, 2022, which primarily consist of a commitment to contribute cash to an equity method investee for certain catastrophic events, in lieu of procuring insurance coverage, a commitment to fund a share of the bonds issued by a government entity for construction of public utilities in the event that other industrial users of the facility default on their utility payments and leases of assets containing general lease indemnities and guaranteed residual values. Contractual Commitments and Contingencies

Subsequent Events

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2022
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On August 2, 2022, we announced our board of directors approved an incremental $5.0 billion share repurchase authorization. The authorization has no expiration date. We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, accelerated share repurchases, tender offers or open market solicitations for shares, some of which may be effected through Rule 10b5-1 plans. The timing of repurchases will depend upon several factors, including market and business conditions, and repurchases may be discontinued at any time. On August 2, 2022 , MPLX announced its board of directors approved an incremental $1.0 billion unit repurchase authorization. This unit repurchase authorization has no expiration date.

Description of the Business a_2

Description of the Business and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Use of estimates	These interim consolidated financial statements are unaudited; however, in the opinion of our management, these statements reflect all adjustments necessary for a fair statement of the results for the periods reported. All such adjustments are of a normal, recurring nature unless otherwise disclosed. These interim consolidated financial statements, including the notes, have been prepared in accordance with the rules of the SEC applicable to interim period financial statements and do not include all of the information and disclosures required by GAAP for complete financial statements. Certain information and disclosures derived from our audited annual financial statements, prepared in accordance with GAAP, have been condensed or omitted from these interim financial statements.
Inventories	Inventories are carried at the lower of cost or market value. Costs of crude oil and refined products are aggregated on a consolidated basis for purposes of assessing whether the LIFO cost basis of these inventories may have to be written down to market values.
Derivative instruments	Derivatives that are not designated as accounting hedges may include commodity derivatives used to hedge price risk on (1) inventories, (2) fixed price sales of refined products, (3) the acquisition of foreign-sourced crude oil, (4) the acquisition of ethanol for blending with refined products, (5) the sale of NGLs, (6) the purchase of natural gas and (7) the purchase of soybean oil.

Short-term Investments (Tables)

Short-term Investments (Tables)	6 Months Ended
Short-term Investments (Tables)	Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation	The components of investments were as follows: June 30, 2022 (In millions) Fair Value Level Amortized Cost Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Short-term Investments Available-for-sale debt securities Commercial paper Level 2 $ 3,300 $ — $ (6) $ 3,294 $ 583 $ 2,711 Certificates of deposit and time deposits Level 2 5,313 — (4) 5,309 3,830 1,479 U.S. government securities Level 1 23 — — 23 — 23 Corporate notes and bonds Level 2 28 — — 28 — 28 Total available-for-sale debt securities $ 8,664 $ — $ (10) $ 8,654 $ 4,413 $ 4,241 Cash 4,665 4,665 — Total $ 13,319 $ 9,078 $ 4,241 December 31, 2021 (In millions) Fair Value Level Amortized Cost Unrealized Gains Unrealized Losses Fair Value Cash and Cash Equivalents Short-term Investments Available-for-sale debt securities Commercial paper Level 2 $ 4,905 $ — $ (1) $ 4,904 $ 868 $ 4,036 Certificates of deposit and time deposits Level 2 2,024 — — 2,024 750 1,274 U.S. government securities Level 1 28 — — 28 — 28 Corporate notes and bonds Level 2 271 — — 271 61 210 Total available-for-sale debt securities $ 7,228 $ — $ (1) $ 7,227 $ 1,679 $ 5,548 Cash 3,612 3,612 — Total $ 10,839 $ 5,291 $ 5,548

Discontinued Operations (Tables

Discontinued Operations (Tables)	6 Months Ended
Discontinued Operations (Tables)	Jun. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
Condensed Income Statement	Results of operations for Speedway are reflected through the close of the sale. The following table presents Speedway results and the gain on sale as reported in income from discontinued operations, net of tax, within our consolidated statements of income. Three Months Ended Six Months Ended (In millions) June 30, 2021 Revenues, other income and net gain on disposal of assets: Revenues and other income $ 3,081 $ 8,420 Net gain on disposal of assets 11,682 11,682 Total revenues, other income and net gain on disposal of assets 14,763 20,102 Costs and expenses: Cost of revenues (excludes items below) 2,748 7,654 Depreciation and amortization 1 3 Selling, general and administrative expenses 48 121 Other taxes 24 75 Total costs and expenses 2,821 7,853 Income from operations 11,942 12,249 Net interest and other financial costs 2 6 Income before income taxes 11,940 12,243 Provision for income taxes 3,726 3,795 Income from discontinued operations, net of tax $ 8,214 $ 8,448

Master Limited Partnership (Tab

Master Limited Partnership (Tables)	6 Months Ended
Master Limited Partnership (Tables)	Jun. 30, 2022
Noncontrolling Interest [Line Items]
Unit Repurchases	Total share repurchases were as follows for the respective periods: Three Months Ended Six Months Ended (In millions, except per share data) 2022 2021 2022 2021 Number of shares repurchased 34 16 71 16 Cash paid for shares repurchased $ 3,331 $ 984 $ 6,177 $ 984 Average cost per share $ 95.46 $ 63.00 $ 85.31 $ 63.00
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net	As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows: Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Decrease due to change in ownership $ (13) $ (41) $ (50) $ (76) Tax impact (7) 7 5 38 Decrease in MPC's additional paid-in capital, net of tax $ (20) $ (34) $ (45) $ (38)
MPLX LP
Noncontrolling Interest [Line Items]
Unit Repurchases	Total unit repurchases were as follows for the respective periods: Three Months Ended Six Months Ended (In millions, except per share data) 2022 2021 2022 2021 Number of common units repurchased 1 6 4 12 Cash paid for common units repurchased $ 35 $ 155 $ 135 $ 310 Average cost per unit $ 33.74 $ 27.40 $ 32.48 $ 26.02

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
Variable Interest Entities (Tables)	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities	The following table presents balance sheet information for the assets and liabilities of MPLX, which are included in our balance sheets. (In millions) June 30, December 31, Assets Cash and cash equivalents $ 298 $ 13 Receivables, less allowance for doubtful accounts 798 660 Inventories 157 142 Other current assets 46 55 Equity method investments 4,099 3,981 Property, plant and equipment, net 19,767 20,042 Goodwill 7,645 7,657 Right of use assets 300 268 Other noncurrent assets 817 891 Liabilities Accounts payable $ 808 $ 671 Payroll and benefits payable 3 6 Accrued taxes 86 75 Debt due within one year 1,000 499 Operating lease liabilities 45 59 Other current liabilities 442 304 Long-term debt 18,775 18,072 Deferred income taxes 14 10 Long-term operating lease liabilities 250 205 Deferred credits and other liabilities 602 559

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
Related Party Transactions (Tables)	Jun. 30, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Transactions with related parties were as follows: Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Sales to related parties $ 21 $ 11 $ 40 $ 54 Purchases from related parties 297 219 579 422 Sales to related parties, which are included in sales and other operating revenues, consist primarily of refined product sales to certain of our equity affiliates.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
Earnings Per Share (Tables)	Jun. 30, 2022
Earnings Per Share [Abstract]
Summary of Earnings Per Common Share	We compute basic earnings per share by dividing net income attributable to MPC less income allocated to participating securities by the weighted average number of shares of common stock outstanding. Since MPC grants certain incentive compensation awards to employees and non-employee directors that are considered to be participating securities, we have calculated our earnings per share using the two-class method. Diluted income per share assumes exercise of certain stock-based compensation awards, provided the effect is not anti-dilutive. Three Months Ended Six Months Ended (In millions, except per share data) 2022 2021 2022 2021 Income from continuing operations, net of tax $ 6,217 $ 588 $ 7,389 $ 418 Less: Net income attributable to noncontrolling interest 344 290 671 596 Net income allocated to participating securities 3 — 3 — Income (loss) from continuing operations available to common stockholders 5,870 298 6,715 (178) Income from discontinued operations, net of tax — 8,214 — 8,448 Income available to common stockholders $ 5,870 $ 8,512 $ 6,715 $ 8,270 Weighted average common shares outstanding: Basic 532 650 549 651 Effect of dilutive securities 4 4 4 — Diluted 536 654 553 651 Income available to common stockholders per share: Basic: Continuing operations $ 11.03 $ 0.46 $ 12.24 $ (0.27) Discontinued operations — 12.63 — 12.98 Net income per share $ 11.03 $ 13.09 $ 12.24 $ 12.71 Diluted: Continuing operations $ 10.95 $ 0.45 $ 12.15 $ (0.27) Discontinued operations — 12.55 — 12.98 Net income per share $ 10.95 $ 13.00 $ 12.15 $ 12.71
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following table summarizes the shares that were anti-dilutive and, therefore, were excluded from the diluted share calculation. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Shares issuable under stock-based compensation plans — 3 — 8

Equity (Tables)

Equity (Tables)	6 Months Ended
Equity (Tables)	Jun. 30, 2022
Equity [Abstract]
Share Repurchases	Total share repurchases were as follows for the respective periods: Three Months Ended Six Months Ended (In millions, except per share data) 2022 2021 2022 2021 Number of shares repurchased 34 16 71 16 Cash paid for shares repurchased $ 3,331 $ 984 $ 6,177 $ 984 Average cost per share $ 95.46 $ 63.00 $ 85.31 $ 63.00

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
Segment Information (Tables)	Jun. 30, 2022
Segment Reporting [Abstract]
Adjusted EBITDA	Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Segment adjusted EBITDA for reportable segments Refining & Marketing $ 7,760 $ 751 $ 9,134 $ 774 Midstream 1,456 1,308 2,859 2,630 Total reportable segments $ 9,216 $ 2,059 $ 11,993 $ 3,404 Reconciliation of segment adjusted EBITDA for reportable segments to income from continuing operations before income taxes Total reportable segments $ 9,216 $ 2,059 $ 11,993 $ 3,404 Corporate (156) (149) (294) (274) Refining planned turnaround costs (151) (61) (296) (173) Storm impacts — — — (47) Renewable volume obligation requirements 238 — 238 — Litigation — — 27 — Impairments (a) — (13) — (13) Depreciation and amortization (b) (819) (871) (1,624) (1,715) Net interest and other financial costs (312) (372) (574) (725) Income from continuing operations before income taxes $ 8,016 $ 593 $ 9,470 $ 457 (a) Impairment of equity method investments.
Reconciliation of Revenue from Segments to Consolidated	Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Sales and other operating revenues Refining & Marketing Revenues from external customers (a) $ 52,300 $ 28,554 $ 89,092 $ 50,215 Intersegment revenues 47 30 83 58 Refining & Marketing segment revenues 52,347 28,584 89,175 50,273 Midstream Revenues from external customers (a) 1,495 1,061 2,761 2,111 Intersegment revenues 1,308 1,248 2,555 2,447 Midstream segment revenues 2,803 2,309 5,316 4,558 Total segment revenues 55,150 30,893 94,491 54,831 Less: intersegment revenues 1,355 1,278 2,638 2,505 Consolidated sales and other operating revenues (a) $ 53,795 $ 29,615 $ 91,853 $ 52,326 (a) Includes related party sales. See Note 7 for additional information.
Other Significant Reconciling Items from Segments to Consolidated	Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Income (loss) from equity method investments Refining & Marketing $ 6 $ 14 $ 18 $ 19 Midstream 141 92 271 178 Corporate (a) — (13) — (13) Consolidated income from equity method investments $ 147 $ 93 $ 289 $ 184 Depreciation and amortization Refining & Marketing $ 475 $ 466 $ 936 $ 944 Midstream 330 331 661 665 Corporate 14 74 27 106 Consolidated depreciation and amortization $ 819 $ 871 $ 1,624 $ 1,715 Capital expenditures Refining & Marketing $ 315 $ 176 $ 559 $ 310 Midstream 222 178 505 316 Segment capital expenditures and investments 537 354 1,064 626 Less investments in equity method investees 48 62 160 113 Plus: Corporate 15 23 38 44 Capitalized interest 25 16 48 30 Consolidated capital expenditures (b) $ 529 $ 331 $ 990 $ 587 (a) Impairment of equity method investment. (b) Includes changes in capital expenditure accruals. See Note 20 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2022 and 2021 as reported in the consolidated statements of cash flows.

Net Interest and Other Financ_2

Net Interest and Other Financial Costs (Tables)	6 Months Ended
Net Interest and Other Financial Costs (Tables)	Jun. 30, 2022
Other Income and Expenses [Abstract]
Net Interest And Other Financial Income (Costs)	Net interest and other financial costs were as follows: Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Interest income $ (18) $ (2) $ (23) $ (3) Interest expense 324 337 634 688 Interest capitalized (25) (19) (48) (36) Pension and other postretirement non-service costs (a) 32 56 11 56 Other financial costs (credits) (1) — — 20 Net interest and other financial costs $ 312 $ 372 $ 574 $ 725 (a) See Note 22.

Inventories (Tables)

Inventories (Tables)	6 Months Ended
Inventories (Tables)	Jun. 30, 2022
Inventory Disclosure [Abstract]
Summary Of Inventories	(In millions) June 30, December 31, Crude oil $ 4,174 $ 2,639 Refined products 5,814 4,460 Materials and supplies 1,060 956 Total $ 11,048 $ 8,055

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
Property, Plant and Equipment (Tables)	Jun. 30, 2022
Property, Plant and Equipment [Abstract]
Summary Of Property, Plant And Equipment	June 30, 2022 December 31, 2021 (In millions) Gross Accumulated Depreciation Net Gross Accumulated Depreciation Net Refining & Marketing $ 32,147 $ 16,018 $ 16,129 $ 31,089 $ 14,876 $ 16,213 Midstream 28,325 7,904 20,421 28,098 7,384 20,714 Corporate 1,470 958 512 1,446 933 513 Total $ 61,942 $ 24,880 $ 37,062 $ 60,633 $ 23,193 $ 37,440

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
Fair Value Measurements (Tables)	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Assets and Liabilities Accounted for at Fair Value on Recurring Basis	The following tables present assets and liabilities accounted for at fair value on a recurring basis as of June 30, 2022 and December 31, 2021 by fair value hierarchy level. We have elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty, including any related cash collateral as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the following tables. June 30, 2022 Fair Value Hierarchy (In millions) Level 1 Level 2 Level 3 Netting and Collateral (a) Net Carrying Value on Balance Sheet (b) Collateral Pledged Not Offset Assets: Commodity contracts $ 761 $ — $ — $ (620) $ 141 $ 79 Liabilities: Commodity contracts $ 622 $ — $ — $ (622) $ — $ — Embedded derivatives in commodity contracts — — 92 — 92 — December 31, 2021 Fair Value Hierarchy (In millions) Level 1 Level 2 Level 3 Netting and Collateral (a) Net Carrying Value on Balance Sheet (b) Collateral Pledged Not Offset Assets: Commodity contracts $ 270 $ 1 $ — $ (235) $ 36 $ 34 Liabilities: Commodity contracts $ 248 $ 1 $ — $ (249) $ — $ — Embedded derivatives in commodity contracts — — 108 — 108 — (a) Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2022, cash collateral of $2 million was netted with the mark-to-market derivative liabilities. As of December 31, 2021, cash collateral of $14 million was netted with mark-to-market derivative liabilities. (b) We have no derivative contracts that are covered by master netting arrangements reflected gross on the balance sheet.
Reconciliation of Net Beginning and Ending Balances Recorded for Net Assets and Liabilities Classified as Level 3	The following is a reconciliation of the beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Beginning balance $ 99 $ 66 $ 108 $ 63 Unrealized and realized (gain)/loss included in net income (4) 39 (8) 45 Settlements of derivative instruments (3) (3) (8) (6) Ending balance $ 92 $ 102 $ 92 $ 102 The amount of total (gain)/loss for the period included in earnings attributable to the change in unrealized losses relating to liabilities still held at the end of period: $ (3) $ 39 $ (8) $ 41

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
Derivatives (Tables)	Jun. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Classification of Fair Values of Derivative Instruments, Excluding Cash Collateral	The following table presents the fair value of derivative instruments as of June 30, 2022 and December 31, 2021 and the line items in the balance sheets in which the fair values are reflected. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under the terms of our master netting arrangements including cash collateral on deposit with, or received from, brokers. We offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements when a legal right of offset exists. As a result, the asset and liability amounts below will not agree with the amounts presented in our consolidated balance sheets. (In millions) June 30, 2022 December 31, 2021 Balance Sheet Location Asset Liability Asset Liability Commodity derivatives Other current assets $ 761 $ 622 $ 271 $ 249 Other current liabilities (a) — 14 — 15 Deferred credits and other liabilities (a) — 78 — 93 (a) Includes embedded derivatives.
Open Commodity Derivative Contracts	The table below summarizes open commodity derivative contracts for crude oil, refined products, blending products and soybean oil as of June 30, 2022. Percentage of contracts that expire next quarter Position (Units in thousands of barrels) Long Short Exchange-traded (a) Crude oil 75.6% 95,368 103,520 Refined products 89.6% 13,539 15,813 Blending products 75.6% 2,966 6,887 Soybean oil 84.0% 3,738 4,342 (a) Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 20,607 long and 21,937 short; Refined products - 1,181 long and 890 short. There are no spread contracts for blending products or soybean oil.
Effect of Commodity Derivative Instruments in Statements of Income	The following table summarizes the effect of all commodity derivative instruments in our consolidated statements of income: Gain (Loss) (In millions) Three Months Ended Six Months Ended Income Statement Location 2022 2021 2022 2021 Sales and other operating revenues $ — $ (5) $ — $ (15) Cost of revenues 17 (168) (325) (233) Other income (1) — 1 — Total $ 16 $ (173) $ (324) $ (248)

Debt (Tables)

Debt (Tables)	6 Months Ended
Debt (Tables)	Jun. 30, 2022
Debt Disclosure [Abstract]
Outstanding Borrowings	Our outstanding borrowings at June 30, 2022 and December 31, 2021 consisted of the following: (In millions) June 30, December 31, Marathon Petroleum Corporation: Senior notes $ 6,449 $ 6,449 Notes payable 1 1 Finance lease obligations 620 589 Total $ 7,070 $ 7,039 MPLX LP: Bank revolving credit facility — 300 Senior notes 20,100 18,600 Finance lease obligations 8 9 Total $ 20,108 $ 18,909 Total debt $ 27,178 $ 25,948 Unamortized debt issuance costs (140) (129) Unamortized (discount) premium, net (264) (280) Amounts due within one year (1,087) (571) Total long-term debt due after one year $ 25,687 $ 24,968
Schedule of Line of Credit Facilities	Available Capacity under our Credit Facilities as of June 30, 2022 (Dollars in millions) Total Outstanding Outstanding Available Weighted Expiration MPC, excluding MPLX MPC bank revolving credit facility $ 5,000 $ — $ 1 $ 4,999 — % October 2023 MPC trade receivables securitization facility (a) 100 — 100 — — September 2022 MPLX MPLX bank revolving credit facility 3,500 — — 3,500 — % July 2024 (a) The committed borrowing and letter of credit issuance capacity of the trade receivables securitization facility is $100 million. In addition, the facility allows for the issuance of letters of credit in excess of the committed capacity at the discretion of the issuing banks. As of June 30, 2022, letters of credit in the total amount of $358 million were issued and outstanding under the facility to secure contracts awarded by the Department of Energy to purchase crude oil from the Strategic Petroleum Reserve. In July 2022, the trade receivables securitization facility was amended to, among other things, extend its term until September 29, 2023.

Revenue (Tables)

Revenue (Tables)	6 Months Ended
Revenue (Tables)	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenue from External Customers by Products and Services	The following table presents our revenues from external customers disaggregated by segment and product line. Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Refining & Marketing: Refined products $ 48,864 $ 26,528 $ 82,457 $ 46,337 Crude oil 2,976 1,866 5,865 3,312 Services and other 460 160 770 566 Total revenues from external customers 52,300 28,554 89,092 50,215 Midstream: Refined products 698 304 1,195 586 Services and other 797 757 1,566 1,525 Total revenues from external customers 1,495 1,061 2,761 2,111 Sales and other operating revenues $ 53,795 $ 29,615 $ 91,853 $ 52,326

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	6 Months Ended
Supplemental Cash Flow Information (Tables)	Jun. 30, 2022
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Six Months Ended (In millions) 2022 2021 Net cash provided by operating activities included: Interest paid (net of amounts capitalized) $ 519 $ 649 Net income taxes paid to (received from) taxing authorities 1,123 319 Non-cash investing and financing activities: Book value of equity method investment (a) 25 — (a) Represents the book value of MPC’s equity method investment in Watson Cogeneration Company at June 1, 2022 prior to MPC buying out the remaining interest in Watson Cogeneration Company. See Note 14 for additional information.
Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures	The consolidated statements of cash flows exclude changes to the consolidated balance sheets that did not affect cash. The following is a reconciliation of additions to property, plant and equipment to total capital expenditures: Six Months Ended (In millions) 2022 2021 Additions to property, plant and equipment per the consolidated statements of cash flows $ 993 $ 606 Decrease in capital accruals (3) (19) Total capital expenditures $ 990 $ 587

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
Accumulated Other Comprehensive Loss (Tables)	Jun. 30, 2022
Equity [Abstract]
Changes in Accumulated Other Comprehensive Loss by Component	The following table shows the changes in accumulated other comprehensive loss by component. Amounts in parentheses indicate debits. (In millions) Pension Benefits Other Benefits Other Total Balance as of December 31, 2020 $ (338) $ (181) $ 7 $ (512) Other comprehensive gain (loss) before reclassifications, net of tax of $44 132 1 (4) 129 Amounts reclassified from accumulated other comprehensive loss: Amortization of prior service cost (credit) (a) (23) 1 — (22) Amortization of actuarial loss (a) 24 5 — 29 Settlement loss (a) 49 — — 49 Tax effect (11) (2) — (13) Other comprehensive income (loss) 171 5 (4) 172 Balance as of June 30, 2021 $ (167) $ (176) $ 3 $ (340) (In millions) Pension Benefits Other Benefits Other Total Balance as of December 31, 2021 $ (117) $ 49 $ 1 $ (67) Other comprehensive gain (loss) before reclassifications, net of tax of $(8) (19) 3 (6) (22) Amounts reclassified from accumulated other comprehensive loss: Amortization of prior service credit (a) (23) (11) — (34) Amortization of actuarial loss (a) 7 3 — 10 Settlement loss (a) 56 — — 56 Tax effect (10) 2 — (8) Other comprehensive income (loss) 11 (3) (6) 2 Balance as of June 30, 2022 $ (106) $ 46 $ (5) $ (65) (a) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 22.

Pension and Other Postretirem_2

Pension and Other Postretirement Benefits (Tables)	6 Months Ended
Pension and Other Postretirement Benefits (Tables)	Jun. 30, 2022
Retirement Benefits [Abstract]
Components of Net Periodic Benefit Costs	The following summarizes the components of net periodic benefit costs: Three Months Ended Six Months Ended (In millions) 2022 2021 2022 2021 Pension Benefits Service cost $ 65 $ 72 $ 133 $ 148 Interest cost 24 23 47 46 Expected return on plan assets (37) (29) (78) (62) Amortization of prior service credit (12) (12) (23) (23) Amortization of actuarial loss 3 14 7 25 Settlement loss 54 49 56 49 Net periodic pension benefit cost $ 97 $ 117 $ 142 $ 183 Other Benefits Service cost $ 5 $ 7 $ 13 $ 17 Interest cost 5 8 10 15 Amortization of prior service cost (credit) (6) — (11) 1 Amortization of actuarial loss 1 3 3 5 Net periodic other benefit cost $ 5 $ 18 $ 15 $ 38

Short-term Investments (Compone

Short-term Investments (Components of Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 8,664	$ 7,228
Unrealized Gains	0	0
Unrealized Losses	(10)	(1)
Fair Value	8,654	7,227
Cash	4,665	3,612
Short-term investments and cash	13,319	10,839
Commercial Paper [Member] \| Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,300	4,905
Unrealized Gains	0	0
Unrealized Losses	(6)	(1)
Fair Value	3,294	4,904
Certificates of deposit and time deposits \| Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,313	2,024
Unrealized Gains	0	0
Unrealized Losses	(4)	0
Fair Value	5,309	2,024
U.S. government securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23	28
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	23	28
Corporate notes and bonds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	28	271
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	28	271
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	4,413	1,679
Cash	4,665	3,612
Short-term investments and cash	9,078	5,291
Cash and Cash Equivalents \| Commercial Paper [Member] \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	583	868
Cash and Cash Equivalents \| Certificates of deposit and time deposits \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	3,830	750
Cash and Cash Equivalents \| U.S. government securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	0
Cash and Cash Equivalents \| Corporate notes and bonds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	0	61
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	4,241	5,548
Cash	0	0
Short-term investments and cash	4,241	5,548
Short-term Investments \| Commercial Paper [Member] \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	2,711	4,036
Short-term Investments \| Certificates of deposit and time deposits \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	1,479	1,274
Short-term Investments \| U.S. government securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	23	28
Short-term Investments \| Corporate notes and bonds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 28	$ 210

Discontinued Operations (Detail

Discontinued Operations (Details) - Speedway - Discontinued Operations, Disposed of by Sale $ in Millions	May 14, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from sale of Speedway	$ 21,380
Proceeds from the sale of Speedway, net of tax	17,220
Gain from disposal of discontinued operation, before income tax	11,680
Gain on disposal of discontinued operation, net of tax	$ 8,020

Discontinued Operations (Result

Discontinued Operations (Results of Operations associated with Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Revenues, other income and net gain on disposal of assets:
Total revenues, other income and net gain on disposal of assets	$ 54,238	$ 29,827		$ 92,622	$ 52,709
Costs and expenses:
Cost of revenues (excludes items below)	44,207	27,177		79,275	48,261
Depreciation and amortization	819	871	[1]	1,624	1,715	[1]
Selling, general and administrative expenses	694	625		1,297	1,200
Other taxes	190	189		382	351
Total costs and expenses	45,910	28,862		82,578	51,527
Income from operations	8,328	965		10,044	1,182
Net interest and other financial costs	312	372		574	725
Income from discontinued operations, net of tax	$ 0	8,214		$ 0	8,448
Discontinued Operations, Disposed of by Sale
Revenues, other income and net gain on disposal of assets:
Revenues and other income		3,081			8,420
Net gain on disposal of assets		11,682			11,682
Total revenues, other income and net gain on disposal of assets		14,763			20,102
Costs and expenses:
Cost of revenues (excludes items below)		2,748			7,654
Depreciation and amortization		1			3
Selling, general and administrative expenses		48			121
Other taxes		24			75
Total costs and expenses		2,821			7,853
Income from operations		11,942			12,249
Net interest and other financial costs		2			6
Income before income taxes		11,940			12,243
Provision for income taxes		3,726			3,795
Income from discontinued operations, net of tax		$ 8,214			$ 8,448

[1]The three and six months ended June 30, 2021 includes $43 million of impairments of long lived assets.

Master Limited Partnership (Det

Master Limited Partnership (Details)	Jun. 30, 2022
MPLX \| Marathon Petroleum Corporation
MPC's partnership interest in MLP (in percentage)	64%

Master Limited Partnership (Uni

Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Nov. 02, 2020
Units acquired, average cost per unit	$ 95.46	$ 63	$ 85.31	$ 63
Stock repurchase program, remaining authorized repurchase amount	$ 4,170		$ 4,170
MPLX LP
Stock repurchase program, authorized amount					$ 1,000
Units repurchased, units	1	6	4	12
Units repurchased, value	$ 35	$ 155	$ 135	$ 310
Units acquired, average cost per unit	$ 33.74	$ 27.40	$ 32.48	$ 26.02
Stock repurchase program, remaining authorized repurchase amount	$ 202		$ 202

Master Limited Partnership (Non

Master Limited Partnership (Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Equity transactions of MPLX	$ (42)	$ (88)	$ (148)	$ (124)
Additional Paid-in Capital
Decrease due to change in ownership	(13)		(41)		$ (50)	$ (76)
Tax impact	(7)		7		5	38
Equity transactions of MPLX	$ (20)	$ (25)	$ (34)	$ (4)	$ (45)	$ (38)

Variable Interest Entities (Con

Variable Interest Entities (Consolidated VIEs) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents	$ 9,078	$ 5,291
Receivables, less allowance for doubtful accounts	17,305	11,034
Inventories	11,048	8,055
Other current assets	741	568
Equity method investments	5,508	5,409
Property, plant and equipment, net	37,062	37,440
Goodwill	8,244	8,256
Right of use assets	1,276	1,372
Other noncurrent assets	2,234	2,400
Liabilities
Accounts payable	22,502	13,700
Payroll and benefits payable	619	911
Accrued taxes	2,584	1,231
Debt due within one year	1,087	571
Operating lease liabilities	391	438
Other current liabilities	1,254	1,047
Long-term debt	25,687	24,968
Deferred income taxes	5,542	5,638
Long-term operating lease liabilities	879	927
Deferred credits and other liabilities	1,390	1,346
Variable Interest Entity, Primary Beneficiary \| MPLX
Assets
Cash and cash equivalents	298	13
Receivables, less allowance for doubtful accounts	798	660
Inventories	157	142
Other current assets	46	55
Equity method investments	4,099	3,981
Property, plant and equipment, net	19,767	20,042
Goodwill	7,645	7,657
Right of use assets	300	268
Other noncurrent assets	817	891
Liabilities
Accounts payable	808	671
Payroll and benefits payable	3	6
Accrued taxes	86	75
Debt due within one year	1,000	499
Operating lease liabilities	45	59
Other current liabilities	442	304
Long-term debt	18,775	18,072
Deferred income taxes	14	10
Long-term operating lease liabilities	250	205
Deferred credits and other liabilities	$ 602	$ 559

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Related Party Transactions [Abstract]
Sales to related parties	$ 21	$ 11	$ 40	$ 54
Purchases from related parties	$ 297	$ 219	$ 579	$ 422

Earnings Per Share (Summary of

Earnings Per Share (Summary of Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Income from continuing operations, net of tax	$ 6,217	$ 588	$ 7,389	$ 418
Less: Net income attributable to noncontrolling interest	344	290	671	596
Net income allocated to participating securities	3	0	3	0
Income (loss) from continuing operations available to common stockholders	5,870	298	6,715	(178)
Income from discontinued operations, net of tax	0	8,214	0	8,448
Income available to common stockholders	$ 5,870	$ 8,512	$ 6,715	$ 8,270
Weighted average common shares outstanding:
Basic (in shares)	532	650	549	651
Effect of dilutive securities (in shares)	4	4	4	0
Diluted (in shares)	536	654	553	651
Basic:
Continuing operations	$ 11.03	$ 0.46	$ 12.24	$ (0.27)
Discontinued operations	0	12.63	0	12.98
Net income per share	11.03	13.09	12.24	12.71
Diluted:
Continuing operations	10.95	0.45	12.15	(0.27)
Discontinued operations	0	12.55	0	12.98
Net income per share	$ 10.95	$ 13	$ 12.15	$ 12.71

Earnings Per Share (Anti-diluti

Earnings Per Share (Anti-dilutive Shares) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stock Based Compensation Expense
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares issuable under stock-based compensation plans	0	3	0	8

Equity (Details)

Equity (Details) - USD ($) $ in Millions	Jun. 30, 2022	Feb. 02, 2022
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount	$ 4,170
Share Repurchase Authorization February 2022
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 5,000

Equity (Share Repurchases) (Det

Equity (Share Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Equity [Abstract]
Number of shares repurchased	34	16	71	16
Cash paid for shares repurchased	$ 3,331	$ 984	$ 6,177	$ 984
Average cost per share	$ 95.46	$ 63	$ 85.31	$ 63

Segment Information (Additional

Segment Information (Additional Information) (Detail)	6 Months Ended
Segment Information (Additional Information) (Detail)	Jun. 30, 2022 Segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information (Segment Ad

Segment Information (Segment Adjusted EBITDA to Income (Loss) from Continuing Operations before Income Taxes) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Refining planned turnaround costs	$ (151)	$ (61)		$ (296)	$ (173)
Storm impacts	0	0		0	(47)
Renewable volume obligation requirements	238	0		238	0
Litigation	0	0		27	0
Impairments	0	(13)	[1]	0	(13)	[1]
Depreciation and amortization	(819)	(871)	[2]	(1,624)	(1,715)	[2]
Net interest and other financial costs	(312)	(372)		(574)	(725)
Income from continuing operations before income taxes	8,016	593		9,470	457
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	9,216	2,059		11,993	3,404
Corporate
Segment Reporting Information [Line Items]
Costs and expenses, excluding depreciation	(156)	(149)		(294)	(274)
Depreciation and amortization	(14)	(74)		(27)	(106)
Refining & Marketing \| Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	7,760	751		9,134	774
Depreciation and amortization	(475)	(466)		(936)	(944)
Midstream \| Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	1,456	1,308		2,859	2,630
Depreciation and amortization	$ (330)	$ (331)		$ (661)	$ (665)

[1]Impairment of equity method investments.[2]The three and six months ended June 30, 2021 includes $43 million of impairments of long lived assets.

Segment Information (Reconcilia

Segment Information (Reconciliation of Segment Revenues To Sales and Other Operating Revenues) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 53,795	$ 29,615	$ 91,853	[1]	$ 52,326	[1]
Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	52,300	28,554	89,092		50,215
Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	1,495	1,061	2,761		2,111
Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,355	1,278	2,638		2,505
Intersegment Eliminations \| Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues		47	30	83		58
Intersegment Eliminations \| Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,308	1,248	2,555		2,447
Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues		55,150	30,893	94,491		54,831
Operating Segments \| Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues		52,347	28,584	89,175		50,273
Operating Segments \| Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 2,803	$ 2,309	$ 5,316		$ 4,558

[1]Includes related party sales. See Note 7 for additional information

Segment Information (Income fro

Segment Information (Income 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
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Income from equity method investments	$ 147	$ 93		$ 289	$ 184
Operating Segments \| Refining & Marketing
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Income from equity method investments	6	14		18	19
Operating Segments \| Midstream
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Income from equity method investments	141	92		271	178
Corporate
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Income from equity method investments	$ 0	$ (13)	[1]	$ 0	$ (13)	[1]

[1]Impairment of equity method investment.

Segment Information (Depreciati

Segment Information (Depreciation and Amortization) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Depreciation and amortization	$ 819	$ 871	[1]	$ 1,624	$ 1,715	[1]
Operating Segments \| Refining & Marketing
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Depreciation and amortization	475	466		936	944
Operating Segments \| Midstream
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Depreciation and amortization	330	331		661	665
Corporate
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Depreciation and amortization	$ 14	$ 74		$ 27	$ 106

[1]The three and six months ended June 30, 2021 includes $43 million of impairments of long lived assets.

Segment Information (Capital Ex

Segment Information (Capital Expenditures (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Plus:
Capital expenditures	[1]	$ 529	$ 331	$ 990	$ 587
Operating Segments
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Capital expenditures and investments		537	354	1,064	626
Less investments in equity method investees		48	62	160	113
Operating Segments \| Refining & Marketing
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Capital expenditures and investments		315	176	559	310
Operating Segments \| Midstream
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Capital expenditures and investments		222	178	505	316
Corporate
Plus:
Corporate		15	23	38	44
Capitalized interest		$ 25	$ 16	$ 48	$ 30

[1]Includes changes in capital expenditure accruals. See Note 20 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2022 and 2021 as reported in the consolidated statements of cash flows.

Net Interest and Other Financ_3

Net Interest and Other Financial Costs (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Income and Expenses [Abstract]
Interest income		$ (18)	$ (2)	$ (23)	$ (3)
Interest expense		324	337	634	688
Interest capitalized		(25)	(19)	(48)	(36)
Pension and other postretirement non-service costs	[1]	32	56	11	56
Other financial costs (credits)		(1)	0	0	20
Net interest and other financial costs		$ 312	$ 372	$ 574	$ 725

[1]See Note 22.

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Provision for income taxes on continuing operations	$ 1,799	$ 5	$ 2,081	$ 39

Inventories (Summary of Invento

Inventories (Summary of Inventories) (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Crude oil	$ 4,174	$ 2,639
Refined products	5,814	4,460
Materials and supplies	1,060	956
Total	$ 11,048	$ 8,055

Equity Method Investments (Deta

Equity Method Investments (Details) $ in Millions		3 Months Ended		6 Months Ended
Equity Method Investments (Details) $ in Millions	Jun. 01, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)		Jun. 30, 2021 USD ($)
Schedule of Equity Method Investments [Line Items]
Payments to acquire business				$ 74		$ 0
Book value of equity method investment				25	[1]	0
Net gain on disposal of assets		$ 39	$ 0	$ 21		$ 3
Watson Cogeneration Company
Schedule of Equity Method Investments [Line Items]
Remaining ownership interest purchased	0.49
Payments to acquire business	$ 59
Fair value of assets contributed	62
Book value of equity method investment	$ 25
Ownership percentage	51%
Net gain on disposal of assets	$ 37

[1]Represents the book value of MPC’s equity method investment in Watson Cogeneration Company at June 1, 2022 prior to MPC buying out the remaining interest in Watson Cogeneration Company. See Note 14 for additional information.

Property, Plant and Equipment_2

Property, Plant and Equipment (Summary of Property, Plant And Equipment) (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross PP&E	$ 61,942	$ 60,633
Accumulated Depreciation	24,880	23,193
Net PP&E	37,062	37,440
Operating Segments \| Refining & Marketing
Property, Plant and Equipment [Line Items]
Gross PP&E	32,147	31,089
Accumulated Depreciation	16,018	14,876
Net PP&E	16,129	16,213
Operating Segments \| Midstream
Property, Plant and Equipment [Line Items]
Gross PP&E	28,325	28,098
Accumulated Depreciation	7,904	7,384
Net PP&E	20,421	20,714
Corporate
Property, Plant and Equipment [Line Items]
Gross PP&E	1,470	1,446
Accumulated Depreciation	958	933
Net PP&E	$ 512	$ 513

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Accounted for at Fair Value on Recurring Basis) (Detail) - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash collateral netted with derivative liabilities		$ 2	$ 14
Fair Value, Measurements, Recurring \| Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - netting and collateral	[1]	(620)	(235)
Derivative asset, net carrying value on balance sheet	[2]	141	36
Commodity derivative instruments, assets - collateral pledged not offset		79	34
Commodity derivative instruments, liabilities - netting and collateral	[1]	(622)	(249)
Derivative liability, net carrying value on balance sheet	[2]	0	0
Commodity derivative instruments, liabilities - collateral pledged not offset		0	0
Fair Value, Measurements, Recurring \| Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - netting and collateral		0	0
Derivative liability, net carrying value on balance sheet	[2]	92	108
Commodity derivative instruments, liabilities - collateral pledged not offset		0	0
Fair Value, Measurements, Recurring \| Level 1 \| Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - gross		761	270
Commodity derivative instruments, liabilities - gross		622	248
Fair Value, Measurements, Recurring \| Level 1 \| Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring \| Level 2 \| Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - gross		0	1
Commodity derivative instruments, liabilities - gross		0	1
Fair Value, Measurements, Recurring \| Level 2 \| Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring \| Level 3 \| Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - gross		0	0
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring \| Level 3 \| Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		$ 92	$ 108

[1]Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2022, cash collateral of $2 million was netted with the mark-to-market derivative liabilities. As of December 31, 2021, cash collateral of $14 million was netted with mark-to-market derivative liabilities.[2]We have no derivative contracts that are covered by master netting arrangements reflected gross on the balance sheet.

Fair Value Measurements (Level

Fair Value Measurements (Level 3) (Details)	6 Months Ended
Fair Value Measurements (Level 3) (Details)	Jun. 30, 2022 USD ($) $ / gal
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Average forward price \| $ / gal	0.98
Embedded derivatives in commodity contracts
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Term of contract	5 years
Embedded derivatives in commodity contracts \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Probability of renewal second term	100%
Minimum \| Commodity derivatives \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Forward commodity price	0.72
Maximum \| Commodity derivatives \| Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Forward commodity price	1.98

Fair Value Measurements (Reconc

Fair Value Measurements (Reconciliation of Net Beginning and Ending Balances Recorded for Net Assets and Liabilities Classified as Level 3) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 99	$ 66	$ 108	$ 63
Unrealized and realized (gain)/loss included in net income	(4)	39	(8)	45
Settlements of derivative instruments	(3)	(3)	(8)	(6)
Ending balance	$ 92	$ 102	$ 92	$ 102

Fair Value Measurements (Gain_L

Fair Value Measurements (Gain/Loss Included in Earnings Relating to Assets Still Held at End of Period) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value Disclosures [Abstract]
The amount of total (gain)/loss for the period included in earnings attributable to the change in unrealized losses relating to liabilities still held at the end of period:	$ (3)	$ 39	$ (8)	$ 41

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Values - Reported) (Detail) - USD ($) $ in Billions	Jun. 30, 2022	Dec. 31, 2021
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 26.3	$ 25.1
Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 24.7	$ 28.1

Derivatives (Classification of

Derivatives (Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral) (Detail) - Commodity derivatives - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Other current assets
Derivative [Line Items]
Asset		$ 761	$ 271
Liability		622	249
Other current liabilities
Derivative [Line Items]
Asset		0	0
Liability	[1]	14	15
Deferred credits and other liabilities
Derivative [Line Items]
Asset		0	0
Liability	[1]	$ 78	$ 93

[1]Includes embedded derivatives.

Derivatives (Open Commodity Der

Derivatives (Open Commodity Derivative Contracts) (Details) - Exchange Traded gal in Thousands, bbl in Thousands	6 Months Ended
	Jun. 30, 2022 bbl gal
Crude oil
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	75.60%
Crude oil \| Long
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	95,368
Crude oil \| Long \| Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	20,607
Crude oil \| Short
Derivative [Line Items]
Notional contracts (in thousands of total barrels) \| gal	103,520
Crude oil \| Short \| Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	21,937
Refined products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	89.60%
Refined products \| Long
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	13,539
Refined products \| Long \| Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	1,181
Refined products \| Short
Derivative [Line Items]
Notional contracts (in thousands of total barrels) \| gal	15,813
Refined products \| Short \| Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	890
Blending products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	75.60%
Blending products \| Long
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	2,966
Blending products \| Short
Derivative [Line Items]
Notional contracts (in thousands of total barrels) \| gal	6,887
Soybean oil
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	84%
Soybean oil \| Long
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	3,738
Soybean oil \| Short
Derivative [Line Items]
Notional contracts (in thousands of total barrels) \| gal	4,342

Derivatives (Effect of Commodit

Derivatives (Effect of Commodity Derivative Instruments in Statements of Income) (Detail) - Commodity 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]
Gain (Loss)	$ 16	$ (173)	$ (324)	$ (248)
Sales and other operating revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss)	0	(5)	0	(15)
Cost of revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss)	17	(168)	(325)	(233)
Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss)	$ (1)	$ 0	$ 1	$ 0

Debt (Outstanding Borrowings) (

Debt (Outstanding Borrowings) (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Total debt	$ 27,178	$ 25,948
Unamortized debt issuance costs	(140)	(129)
Unamortized (discount) premium, net	(264)	(280)
Amounts due within one year	(1,087)	(571)
Total long-term debt due after one year	25,687	24,968
Marathon Petroleum Corporation:
Finance lease obligations	620	589
Total debt	7,070	7,039
Marathon Petroleum Corporation: \| Senior notes
Long-term debt, gross	6,449	6,449
Marathon Petroleum Corporation: \| Notes payable
Long-term debt, gross	1	1
MPLX LP:
Finance lease obligations	8	9
Total debt	20,108	18,909
MPLX LP: \| Bank revolving credit facility
Long-term debt, gross	0	300
MPLX LP: \| Senior notes
Long-term debt, gross	$ 20,100	$ 18,600

Debt (MPLX Senior Notes) (Detai

Debt (MPLX Senior Notes) (Details) - Senior notes - MPLX LP: - USD ($) $ in Millions	Jun. 30, 2022	Mar. 14, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 20,100		$ 18,600
4.950% senior notes due March 2052
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,500

Debt (Available Capacity under

Debt (Available Capacity under our Facilities) (Details) $ in Millions	Jun. 30, 2022 USD ($)
MPC revolving credit facility due October 2023
Debt Instrument [Line Items]
Total Capacity	$ 5,000
Outstanding Borrowings	0
Outstanding Letters of Credit	1
Available Capacity	$ 4,999
Weighted Average Interest Rate	0%
Maximum borrowing capacity	$ 5,000
MPC trade receivables securitization facility
Debt Instrument [Line Items]
Total Capacity	100	[1]
Outstanding Borrowings	0
Outstanding Letters of Credit	100
Available Capacity	$ 0
Weighted Average Interest Rate	0%
Maximum borrowing capacity	$ 100
MPC trade receivables securitization facility \| Purchase crude oil from Strategic Petroleum Reserve
Debt Instrument [Line Items]
Outstanding Letters of Credit	358
MPLX LP \| MPLX bank revolving credit facility due July 2024
Debt Instrument [Line Items]
Total Capacity	3,500
Outstanding Borrowings	0
Outstanding Letters of Credit	0
Available Capacity	$ 3,500
Weighted Average Interest Rate	0%
Maximum borrowing capacity	$ 3,500

[1]The committed borrowing and letter of credit issuance capacity of the trade receivables securitization facility is $100 million. In addition, the facility allows for the issuance of letters of credit in excess of the committed capacity at the discretion of the issuing banks. As of June 30, 2022, letters of credit in the total amount of $358 million were issued and outstanding under the facility to secure contracts awarded by the Department of Energy to purchase crude oil from the Strategic Petroleum Reserve. In July 2022, the trade receivables securitization facility was amended to, among other things, extend its term until September 29, 2023.

Debt (MPC Bank Revolving Credit

Debt (MPC Bank Revolving Credit Facility) (Details) - USD ($) $ in Millions	Jul. 07, 2022	Jun. 30, 2022
MPC revolving credit facility due October 2023
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 5,000
MPC bank revolving credit facility due July 2027 \| Subsequent Event
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 5,000
Marathon Petroleum Corporation: \| MPC bank revolving credit facility due July 2027 \| Subsequent Event
Line of Credit Facility [Line Items]
Description of variable rate basis	at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the New MPC Credit Agreement, plus an applicable margin

Debt (MPLX Bank Revolving Credi

Debt (MPLX Bank Revolving Credit Facility) (Details) - MPLX LP: - USD ($) $ in Millions	Jul. 07, 2022	Jun. 30, 2022
MPLX bank revolving credit facility due July 2024
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 3,500
MPLX bank revolving credit facility due July 2027 \| Subsequent Event
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000
Description of variable rate basis	at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the MPLX Credit Agreement, plus an applicable margin
MPLX bank revolving credit facility due July 2027 \| Letter of Credit \| Subsequent Event
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 150

Revenue (Disaggregated by Produ

Revenue (Disaggregated by Product Line) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
Sales and other operating revenues		$ 53,795	$ 29,615	$ 91,853	[1]	$ 52,326	[1]
Refining & Marketing
Sales and other operating revenues	[1]	52,300	28,554	89,092		50,215
Refining & Marketing \| Refined products
Sales and other operating revenues		48,864	26,528	82,457		46,337
Refining & Marketing \| Crude oil
Sales and other operating revenues		2,976	1,866	5,865		3,312
Refining & Marketing \| Services and other
Sales and other operating revenues		460	160	770		566
Midstream
Sales and other operating revenues	[1]	1,495	1,061	2,761		2,111
Midstream \| Refined products
Sales and other operating revenues		698	304	1,195		586
Midstream \| Services and other
Sales and other operating revenues		$ 797	$ 757	$ 1,566		$ 1,525

[1]Includes related party sales. See Note 7 for additional information

Revenue (Details)

Revenue (Details) $ in Millions	Jun. 30, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Matching buy/sell receivables	$ 7,810

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$ 519		$ 649
Net income taxes paid to (received from) taxing authorities	1,123		319
Non-cash investing and financing activities:
Book value of equity method investment	$ 25	[1]	$ 0

[1]Represents the book value of MPC’s equity method investment in Watson Cogeneration Company at June 1, 2022 prior to MPC buying out the remaining interest in Watson Cogeneration Company. See Note 14 for additional information.

Supplemental Cash Flow Inform_4

Supplemental Cash Flow Information (Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Supplemental Cash Flow Elements [Abstract]
Additions to property, plant and equipment per the consolidated statements of cash flows				$ 993	$ 606
Decrease in capital accruals				(3)	(19)
Capital expenditures	[1]	$ 529	$ 331	$ 990	$ 587

[1]Includes changes in capital expenditure accruals. See Note 20 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2022 and 2021 as reported in the consolidated statements of cash flows.

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss by Component) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (67)		$ (512)	$ (67)	$ (512)
Other comprehensive income (loss), before reclassifications, net of tax						(22)	129
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit						(34)	(22)
Amortization of actuarial loss						10	29
Settlement loss						56	49
Tax effect						(8)	(13)
Other comprehensive income (loss)		$ 9	(7)	$ 171	1	2	172
Ending balance		(65)		(340)		(65)	(340)
Other comprehensive income (loss) before reclassifications, tax						(8)	44
Accumulated Defined Benefit Plans Adjustment \| Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(117)		(338)	(117)	(338)
Other comprehensive income (loss), before reclassifications, net of tax						(19)	132
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit	[1]					(23)	(23)
Amortization of actuarial loss	[1]					7	24
Settlement loss	[1]					56	49
Tax effect						(10)	(11)
Other comprehensive income (loss)						11	171
Ending balance		(106)		(167)		(106)	(167)
Accumulated Defined Benefit Plans Adjustment \| Other Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			49		(181)	49	(181)
Other comprehensive income (loss), before reclassifications, net of tax						3	1
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit	[1]					(11)	1
Amortization of actuarial loss	[1]					3	5
Settlement loss						0	0
Tax effect						2	(2)
Other comprehensive income (loss)						(3)	5
Ending balance		46		(176)		46	(176)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 1		$ 7	1	7
Other comprehensive income (loss), before reclassifications, net of tax						(6)	(4)
Amounts reclassified from accumulated other comprehensive loss:
Tax effect						0	0
Other comprehensive income (loss)						(6)	(4)
Ending balance		$ (5)		$ 3		$ (5)	$ 3

[1]These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 22.

Pension and Other Postretirem_3

Pension and Other Postretirement Benefits (Components of Net Periodic Benefit Costs) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Benefits
Components of net periodic benefit cost:
Service cost	$ 65	$ 72	$ 133	$ 148
Interest cost	24	23	47	46
Expected return on plan assets	(37)	(29)	(78)	(62)
Amortization of prior service cost (credit)	(12)	(12)	(23)	(23)
Amortization of actuarial loss	3	14	7	25
Settlement loss	54	49	56	49
Net periodic benefit cost	97	117	142	183
Other Benefits
Components of net periodic benefit cost:
Service cost	5	7	13	17
Interest cost	5	8	10	15
Amortization of prior service cost (credit)	(6)	0	(11)	1
Amortization of actuarial loss	1	3	3	5
Net periodic benefit cost	$ 5	$ 18	$ 15	$ 38

Pension and Other Postretirem_4

Pension and Other Postretirement Benefits (Additional Information) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ 9
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ 31

Commitments and Contingencies (

Commitments and Contingencies (Detail)	6 Months Ended
Commitments and Contingencies (Detail)	Jun. 30, 2022
Pending Litigation
Loss Contingencies [Line Items]
Loss contingency, inestimable loss	For matters for which we have not recorded a liability, we are unable to estimate a range of possible loss because the issues involved have not been fully developed through pleadings, discovery or court proceedings.

Commitments and Contingencies_2

Commitments and Contingencies (Environmental Matters) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Accrued liabilities for remediation	$ 396	$ 401
Receivables for recoverable costs	$ 5	$ 6

Commitments and Contingencies_3

Commitments and Contingencies (Other Legal Proceedings) (Details) - USD ($) $ in Millions		1 Months Ended
	Dec. 15, 2020	Jul. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss contingency, damages sought, value		$ 187
Loss contingency, damages paid, value	$ 4

Commitments and Contingencies_4

Commitments and Contingencies (Guarantees) (Details) $ in Millions	Jun. 30, 2022 USD ($)
Other Guarantees
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 98
LOOP and LOCAP LLC \| Guarantee of Indebtedness of Others \| Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 171
Bakken Pipeline System
Loss Contingencies [Line Items]
Ownership percentage	9.19%
Bakken Pipeline System \| Guarantee of Indebtedness of Others \| Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 170
Crowley Ocean Partners
Loss Contingencies [Line Items]
Ownership percentage	50%
Crowley Ocean Partners \| Guarantee of Indebtedness of Others \| Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 103
Crowley Blue Water Partners
Loss Contingencies [Line Items]
Ownership percentage	50%
Crowley Blue Water Partners \| Guarantee of Indebtedness of Others \| Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 104

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Billions	Aug. 02, 2022	Nov. 02, 2020
Subsequent Event \| Share Repurchase Authorization August 2022
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 5
MPLX LP:
Subsequent Event [Line Items]
Stock repurchase program, authorized amount		$ 1
MPLX LP: \| Subsequent Event \| Share Repurchase Authorization August 2022
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 1