Marathon Petroleum (MPC) 10-K 23 Feb 23 2022 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2022	Feb. 16, 2023	Jun. 30, 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)	FY
Amendment Flag	false
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 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 Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 42.1
Entity Common Stock, Shares Outstanding		445,546,907

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Auditor Information [Abstract]
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Toledo, Ohio

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues and other income:
Sales and other operating revenues	$ 177,453	$ 119,983	$ 69,779
Income (loss) from equity method investments	655	458	(935)	[1]
Net gain on disposal of assets	1,061	21	70
Other income	783	468	118
Revenues and other income	179,952	120,930	69,032
Costs and expenses:
Cost of revenues (excludes items below)	151,671	110,008	65,733
Impairment expense	0	0	8,426
Depreciation and amortization	3,215	3,364	3,375
Selling, general and administrative expenses	2,772	2,537	2,710
Restructuring expenses	0	0	367	[2]
Other taxes	825	721	668
Total costs and expenses	158,483	116,630	81,279
Income (loss) from continuing operations	21,469	4,300	(12,247)
Net interest and other financial costs	1,000	1,483	1,365
Income (loss) from continuing operations before income taxes	20,469	2,817	(13,612)
Provision (benefit) for income taxes on continuing operations	4,491	264	(2,430)
Income (loss) from continuing operations, net of tax	15,978	2,553	(11,182)
Income from discontinued operations, net of tax	72	8,448	1,205
Net income (loss)	16,050	11,001	(9,977)
Less net income (loss) attributable to:
Redeemable noncontrolling interest	88	100	81
Noncontrolling interests	1,446	1,163	(232)
Net income (loss) attributable to MPC	$ 14,516	$ 9,738	$ (9,826)
Basic:
Continuing operations	$ 28.17	$ 2.03	$ (16.99)
Discontinued operations	0.14	13.31	1.86
Net income (loss) per share	$ 28.31	$ 15.34	$ (15.13)
Weighted average shares outstanding	512	634	649
Diluted:
Continuing operations	$ 27.98	$ 2.02	$ (16.99)
Discontinued operations	0.14	13.22	1.86
Net income (loss) per share	$ 28.12	$ 15.24	$ (15.13)
Weighted average shares outstanding	516	638	649
[1]2020 includes impairment expense. See Note 7 for further information.[2]See Note 19.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income (loss)	$ 16,050	$ 11,001	$ (9,977)
Other comprehensive income (loss)	69	445	(192)
Comprehensive income (loss)	16,119	11,446	(10,169)
Less comprehensive income (loss) attributable to:
Redeemable noncontrolling interest	88	100	81
Noncontrolling interests	1,446	1,163	(232)
Comprehensive income (loss) attributable to MPC	14,585	10,183	(10,018)
Actuarial changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	122	276	(157)
Prior service
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	(52)	175	(34)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (1)	$ (6)	$ (1)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Actuarial changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, tax expense (benefit)	$ 36	$ 91	$ (51)
Prior service
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, tax expense (benefit)	(15)	58	(11)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, tax expense (benefit)	$ 0	$ (2)	$ 0

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Assets
Cash and cash equivalents		$ 8,625	$ 5,291
Short-term investments		3,145	5,548
Receivables, less allowance for doubtful accounts of $29 and $40, respectively		13,477	11,034
Inventories		8,827	8,055
Other current assets		1,168	568
Total current assets		35,242	30,496
Equity method investments		6,466	5,409
Property, plant and equipment, net	[1]	35,657	37,440
Goodwill		8,244	8,256
Right of use assets		1,214	1,372
Other noncurrent assets		3,081	2,400
Total assets		89,904	85,373
Liabilities
Accounts payable		15,312	13,700
Payroll and benefits payable		967	911
Accrued taxes		1,140	1,231
Debt due within one year		1,066	571
Operating lease liabilities		368	438
Other current liabilities		1,167	1,047
Total current liabilities		20,020	17,898
Long-term debt		25,634	24,968
Deferred income taxes		5,904	5,638
Defined benefit postretirement plan obligations		1,114	1,015
Long-term operating lease liabilities		841	927
Deferred credits and other liabilities		1,304	1,346
Total liabilities		54,817	51,792
Commitments and contingencies (see Note 29)
Redeemable noncontrolling interest		968	965
Equity
Preferred stock, no shares issued and outstanding (par value $0.01 per share, 30 million shares authorized)		0	0
Common stock:
Issued – 990 million and 984 million shares (par value $0.01 per share, 2 billion shares authorized)		10	10
Held in treasury, at cost – 536 million and 405 million shares		(31,841)	(19,904)
Additional paid-in capital		33,402	33,262
Retained earnings		26,142	12,905
Accumulated other comprehensive income (loss)		2	(67)
Total MPC stockholders’ equity		27,715	26,206
Noncontrolling interests		6,404	6,410
Total equity		34,119	32,616
Total liabilities, redeemable noncontrolling interest and equity		$ 89,904	$ 85,373
[1]Includes finance leases. See Note 28.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Receivables, allowance for doubtful accounts, current	$ 29	$ 40
Preferred Stock:
Shares issued	0	0
Shares outstanding	0	0
Par value per share	$ 0.01
Shares authorized	30
Common stock:
Shares issued	990	984
Par value per share	$ 0.01
Shares authorized	2,000
Treasury stock, shares	(536)	(405)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income (loss)		$ 16,050	$ 11,001	$ (9,977)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of deferred financing costs and debt discount		50	79	69
Impairment expense		0	0	8,426
Depreciation and amortization		3,215	3,364	3,375
Pension and other postretirement benefits, net		172	(499)	220
Deferred income taxes		290	(169)	(241)
Net gain on disposal of assets		(1,061)	(21)	(70)
(Income) loss from equity method investments		(655)	(458)	935	[1]
Distributions from equity method investments		772	652	577
Income from discontinued operations		(72)	(8,448)	(1,205)
Changes in income tax receivable		(555)	2,089	(1,807)
Changes in the fair value of derivative instruments		(147)	16	45
Changes in:
Current receivables		(2,315)	(5,299)	1,465
Inventories		(787)	(33)	1,750
Current accounts payable and accrued liabilities		1,909	6,260	(2,927)
Right of use assets and operating lease liabilities, net		0	3	(19)
All other, net		(547)	(153)	191
Cash provided by operating activities - continuing operations		16,319	8,384	807
Cash provided by (used in) operating activities - discontinued operations		42	(4,024)	1,612
Net cash provided by operating activities		16,361	4,360	2,419
Investing activities:
Additions to property, plant and equipment		(2,420)	(1,464)	(2,787)
Acquisitions, net of cash acquired		(413)	0	0
Disposal of assets		90	153	150
Investments – acquisitions and contributions		(405)	(210)	(485)
Investments - redemptions, repayments and return of capital		515	39	137
Purchases of short-term investments		(6,023)	(12,498)	0
Sales of short-term investments		1,296	1,544	0
Maturities of short-term investments		7,159	5,406	0
All other, net		824	513	63
Cash provided by (used in) investing activities - continuing operations		623	(6,517)	(2,922)
Cash provided by (used in) investing activities - discontinued operations		0	21,314	(335)
Net cash provided by (used in) investing activities		623	14,797	(3,257)
Financing activities:
Commercial paper – issued		0	7,414	2,055
Commercial paper - repayments		0	(8,437)	(1,031)
Long-term debt – borrowings		3,379	12,150	17,082
Long-term debt – repayments		(2,280)	(17,400)	(15,380)
Debt issuance costs		(39)	0	(50)
Issuance of common stock		243	106	11
Common stock repurchased		(11,922)	(4,654)	0
Dividends paid		(1,279)	(1,484)	(1,510)
Distributions to noncontrolling interests		(1,214)	(1,449)	(1,244)
Repurchases of noncontrolling interests		(491)	(630)	(33)
All other, net		(44)	(35)	(35)
Net cash used in financing activities		(13,647)	(14,419)	(135)
Net change in cash, cash equivalents and restricted cash		3,337	4,738	(973)
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning balance	[2]	5,294	416	1,395
Cash, cash equivalents, restricted cash and restricted cash equivalents, discontinued operations, beginning balance		0	140	134
Cash, cash equivalents, restricted cash and restricted cash equivalents, discontinued operations, ending balance		0	0	140
Cash, cash equivalents, restricted cash and restricted cash equivalents, ending balance	[2]	$ 8,631	$ 5,294	$ 416
[1]2020 includes impairment expense. See Note 7 for further information.[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, 2019	$ 42,139	$ 10	$ (15,143)	$ 33,157	$ 15,990	$ (320)	$ 8,445
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(10,058)				(9,826)		(232)
Dividends declared on common stock	(1,514)				(1,514)
Distributions to noncontrolling interests	(1,163)						(1,163)
Other comprehensive income (loss)	(192)					(192)
Shares issued - stock based compensation				92
Shares returned - stock based compensation			(14)
Share-based compensation	86						8
Equity transactions of MPLX	(46)			(41)			(5)
Ending 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)	10,901				9,738		1,163
Dividends declared on common stock	(1,483)				(1,483)
Distributions to noncontrolling interests	(1,349)						(1,349)
Other comprehensive income (loss)	445					445
Shares repurchased	(4,740)		(4,740)
Shares issued - stock based compensation				147
Shares returned - stock based compensation			7
Share-based compensation	144						4
Equity transactions of MPLX	(554)			(93)			(461)
Ending 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)	15,962				14,516		1,446
Dividends declared on common stock	(1,279)				(1,279)
Distributions to noncontrolling interests	(1,129)						(1,129)
Other comprehensive income (loss)	69					69
Shares repurchased	(11,933)		(11,933)
Shares issued - stock based compensation				260
Shares returned - stock based compensation			(4)
Share-based compensation	260						4
Equity transactions of MPLX	(447)			(120)			(327)
Ending balance at Dec. 31, 2022	$ 34,119	$ 10	$ (31,841)	$ 33,402	$ 26,142	$ 2	$ 6,404

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, 2019		978
Shares issued - share-based compensation		2
Ending balance at Dec. 31, 2020		980
Shares issued - share-based compensation		4
Ending balance at Dec. 31, 2021	984	984
Shares issued - share-based compensation		6
Ending balance at Dec. 31, 2022	990	990

Consolidated Statements of Eq_3

Consolidated Statements of Equity ad Redeemable Noncontrolling Interest (Shares of Treasury Stock) - shares shares in Millions	Total	Treasury Stock
Beginning balance at Dec. 31, 2019		(329)
Number of shares repurchased	0
Ending balance at Dec. 31, 2020		(329)
Number of shares repurchased	(76)	(76)
Ending balance at Dec. 31, 2021	(405)	(405)
Number of shares repurchased	(131)	(131)
Ending balance at Dec. 31, 2022	(536)	(536)

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, 2019		$ 968
Net income (loss) attributable to redeemable noncontrolling interest	$ 81	81
Distributions to noncontrolling interests		(81)
Equity transactions of MPLX		0
Ending balance at Dec. 31, 2020		968
Net income (loss) attributable to redeemable noncontrolling interest	100	100
Distributions to noncontrolling interests		(100)
Equity transactions of MPLX		(3)
Ending balance at Dec. 31, 2021	965	965
Net income (loss) attributable to redeemable noncontrolling interest	88	88
Distributions to noncontrolling interests		(85)
Equity transactions of MPLX		0
Ending balance at Dec. 31, 2022	$ 968	$ 968

Consolidated Statements of Eq_5

Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per share of common stock (in dollars per share)	$ 2.49	$ 2.32	$ 2.32

Description of the Business and

Description of the Business and Basis of Presentation	12 Months Ended
	Dec. 31, 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. 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, Inc. (“7-Eleven”). Speedway’s results are reported separately as discontinued operations, net of tax, in our consolidated statements of income for all periods presented. In addition, we separately disclosed the operating and investing cash flows of Speedway as discontinued operations within our consolidated statements of cash flow. See Note 5 for discontinued operations disclosures. Refer to Notes 6 and 12 for additional information about our operations. Basis of Presentation All significant intercompany transactions and accounts have been eliminated. In accordance with ASC 205, Discontinued Operations , intersegment sales from our Refining & Marketing segment to Speedway are no longer eliminated as intercompany transactions and are now presented within sales and other operating revenues, since we continue to supply fuel to Speedway subsequent to the sale to 7-Eleven. All periods presented have been retrospectively adjusted through the sale date of May 14, 2021 to reflect this change. Additionally, from August 2, 2020 through May 14, 2021, in accordance with ASC 360, Property, Plant, and Equipment , we ceased recording depreciation and amortization for Speedway’s PP&E, finite-lived intangible assets and right of use lease assets.

Summary of Principal Accounting

Summary of Principal Accounting Policies	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Summary Of Principal Accounting Policies	Summary of Principal Accounting Policies Principles Applied in Consolidation These consolidated financial statements include the accounts of our majority-owned, controlled subsidiaries and MPLX. As of December 31, 2022, we owned the general partner and approximately 65 percent of the outstanding MPLX common units. Due to our ownership of the general partner interest, we have determined that we control MPLX and therefore we consolidate MPLX and record a noncontrolling interest for the interest owned by the public. Changes in ownership interest in consolidated subsidiaries that do not result in a change in control are recorded as equity transactions. Investments in entities over which we have significant influence, but not control, are accounted for using the equity method of accounting. This includes entities in which we hold majority ownership but the minority shareholders have substantive participating rights. Income from equity method investments represents our proportionate share of net income generated by the equity method investees. Differences in the basis of the investments and the separate net asset values of the investees, if any, are amortized into net income over the remaining useful lives of the underlying assets and liabilities, except for any excess related to goodwill. Equity method investments are evaluated for impairment whenever changes in the facts and circumstances indicate an other than temporary loss in value has occurred. When the loss is deemed to be other than temporary, the carrying value of the equity method investment is written down to fair value. Use of Estimates The preparation of financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the respective reporting periods. Actual results could differ from those estimates. Revenue Recognition We recognize revenue based on consideration specified in contracts or agreements with customers when we satisfy our performance obligations by transferring control over products or services to a customer. We made an accounting policy election that all taxes assessed by a governmental authority that are both imposed on and concurrent with a revenue-producing transaction and collected from our customers will be recognized on a net basis within sales and other operating revenues. Our revenue recognition patterns are described below by reportable segment: • Refining & Marketing - The vast majority of our Refining & Marketing contracts contain pricing that is based on the market price for the product at the time of delivery. Our obligations to deliver product volumes are typically satisfied and revenue is recognized when control of the product transfers to our customers. Concurrent with the transfer of control, we typically receive the right to payment for the delivered product, the customer accepts the product and the customer has significant risks and rewards of ownership of the product. Payment terms require customers to pay shortly after delivery and do not contain significant financing components. • Midstream - Midstream revenue transactions typically are defined by contracts under which we sell a product or provide a service. Revenues from sales of product are recognized when control of the product transfers to the customer. Revenues from services are recognized over time when the performance obligation is satisfied as services are provided in a series. We have elected to use the output measure of progress to recognize revenue based on the units delivered, processed or transported. The transaction prices in our Midstream contracts often have both fixed components, related to minimum volume commitments, and variable components, which are primarily dependent on volumes. Variable consideration will generally not be estimated at contract inception as the transaction price is specifically allocable to the services provided at each period end. Refer to Note 23 for disclosure of our revenue disaggregated by segment and product line and to Note 12 for a description of our reportable segment operations. Crude Oil and Refined Product Exchanges and Matching Buy/Sell Transactions We enter into exchange contracts and matching buy/sell arrangements whereby we agree to deliver a particular quantity and quality of crude oil or refined products at a specified location and date to a particular counterparty and to receive from the same counterparty the same commodity at a specified location on the same or another specified date. The exchange receipts and deliveries are nonmonetary transactions, with the exception of associated grade or location differentials that are settled in cash. The matching buy/sell purchase and sale transactions are settled in cash. No revenues are recorded for exchange and matching buy/sell transactions as they are accounted for as exchanges of inventory. The exchange transactions are recognized at the carrying amount of the inventory transferred. Cash and Cash Equivalents Cash and cash equivalents include cash on hand and on deposit and investments in highly liquid debt instruments with maturities of three months or less. Short-Term Investments Investments with a maturity date greater than three months that we intend to convert to cash or cash equivalents within a year or less are classified as short-term investments in our consolidated balance sheets. Additionally, in accordance with ASC 320, Investments - Debt Securities , we have classified all short-term investments as available-for-sale securities and changes in fair market value are reported in other comprehensive income. Accounts Receivable and Allowance for Doubtful Accounts Our receivables primarily consist of customer accounts receivable. Customer receivables are recorded at the invoiced amounts and generally do not bear interest. Allowances for doubtful accounts are generally recorded when it becomes probable the receivable will not be collected and are booked to bad debt expense. The allowance for doubtful accounts is the best estimate of the amount of probable credit losses in customer accounts receivable. We review the allowance quarterly and past-due balances over 150 days are reviewed individually for collectability. We mitigate credit risk with master netting agreements with companies engaged in the crude oil or refinery feedstock trading and supply business or the petroleum refining industry. A master netting agreement generally provides for a once per month net cash settlement of the accounts receivable from and the accounts payable to a particular counterparty. Leases Contracts with a term greater than one year that convey the right to direct the use of and obtain substantially all of the economic benefit of an asset are accounted for as right of use assets. Right of use asset and lease liability balances are recorded at the commencement date at present value of the fixed lease payments using a secured incremental borrowing rate with a maturity similar to the lease term because our leases do not provide implicit rates. We have elected to include both lease and non-lease components in the present value of the lease payments for all lessee asset classes with the exception of our marine and third-party contractor service equipment leases. The lease component of the payment for the marine and equipment asset classes is determined using a relative standalone selling price. See Note 28 for additional disclosures about our lease contracts. As a lessor under ASU No. 2016-02, Leases (“ASC 842”), MPLX may be required to re-classify existing operating leases to sales-type leases upon modification and related reassessment of the leases. See Note 28 for further information regarding our ongoing evaluation of the impacts of lease reassessments as modifications occur. The net investment in sales-type leases is recorded within receivables, net and other noncurrent assets on the consolidated balance sheets. These amounts are comprised of the present value of the sum of the future minimum lease payments representing the value of the lease receivable and the unguaranteed residual value of the lease assets. Management assesses the net investment in sales-type leases for recoverability quarterly. Inventories Inventories are carried at the lower of cost or market value. Cost of inventories is determined primarily under the LIFO method. Costs for crude oil and refined product inventories are aggregated on a consolidated basis for purposes of assessing if the LIFO cost basis of these inventories may have to be written down to market value. Fair Value We account for certain assets and liabilities at fair value. The hierarchy below lists three levels of fair value based on the extent to which inputs used in measuring fair value are observable in the market. We categorize each of our fair value measurements in one of these three levels based on the lowest level input that is significant to the fair value measurement in its entirety. These levels are: • Level 1 – inputs are based upon unadjusted quoted prices for identical instruments in active markets. Our Level 1 derivative assets and liabilities include exchange-traded contracts for crude oil and refined products measured at fair value with a market approach using the close-of-day settlement prices for the market. Commodity derivatives are covered under master netting agreements with an unconditional right to offset. Collateral deposits in futures commission merchant accounts covered by master netting agreements related to Level 1 commodity derivatives are classified as Level 1. • Level 2 – inputs are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Where applicable, these models project future cash flows and discount the future amounts to a present value using market-based observable inputs including interest rate curves, credit spreads, and forward and spot prices for currencies. Our Level 2 investments include commercial paper, certificates of deposit, time deposits and corporate notes and bonds. Our Level 2 derivative assets and liabilities primarily include certain OTC contracts. • Level 3 – inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques, including option pricing models and discounted cash flow models. Our Level 3 assets and liabilities include goodwill, long-lived assets and intangible assets, when they are recorded at fair value due to an impairment charge and an embedded derivative liability relates to a natural gas purchase agreement embedded in a keep‑whole processing agreement. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities. Derivative Instruments We use derivatives to economically hedge a portion of our exposure to commodity price risk and, historically, to interest rate risk. Our use of selective derivative instruments that assume market risk is limited. All derivative instruments (including derivative instruments embedded in other contracts) are recorded at fair value. Certain commodity derivatives are reflected on the consolidated balance sheets on a net basis by counterparty as they are governed by master netting agreements. Cash flows related to derivatives used to hedge commodity price risk and interest rate risk are classified in operating activities with the underlying transactions. Derivatives not designated as accounting hedges 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. Changes in the fair value of derivatives not designated as accounting hedges are recognized immediately in net income. Concentrations of credit risk All of our financial instruments, including derivatives, involve elements of credit and market risk. The most significant portion of our credit risk relates to nonperformance by counterparties. The counterparties to our financial instruments consist primarily of major financial institutions and companies within the energy industry. To manage counterparty risk associated with financial instruments, we select and monitor counterparties based on an assessment of their financial strength and on credit ratings, if available. Additionally, we limit the level of exposure with any single counterparty. Property, Plant and Equipment Property, plant and equipment are recorded at cost and depreciated on a straight-line basis over the estimated useful lives of the assets, generally 10 to 40 years for refining and midstream assets, 25 years for office buildings and 4 to 7 years for other miscellaneous fixed assets. Such assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable. If the sum of the expected undiscounted future cash flows from the use of the asset group and its eventual disposition is less than the carrying amount of the asset group, an impairment assessment is performed and the excess of the book value over the fair value of the asset group is recorded as an impairment loss. When items of property, plant and equipment are sold or otherwise disposed of, any gains or losses are reported in net income. Gains on the disposal of property, plant and equipment are recognized when earned, which is generally at the time of closing. If a loss on disposal is expected, such losses are recognized when the assets are classified as held for sale. Interest expense is capitalized for qualifying assets under construction. Capitalized interest costs are included in property, plant and equipment and are depreciated over the useful life of the related asset. Goodwill and Intangible Assets Goodwill represents the excess of the purchase price over the estimated fair value of the net assets acquired in the acquisition of a business. Goodwill is not amortized, but rather is tested for impairment at the reporting unit level annually and when events or changes in circumstances indicate that the fair value of a reporting unit with goodwill has been reduced below carrying value. If we determine, based on a qualitative assessment, that it is not more likely than not that a reporting unit’s fair value is less than its carrying amount, no further impairment testing is required. If we do not perform a qualitative assessment or if that assessment indicates that further impairment testing is required, the fair value of each reporting unit is determined using an income and/or market approach which is compared to the carrying value of the reporting unit. If the carrying amount of the reporting unit exceeds its fair value, an impairment loss would be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. The fair value under the income approach is calculated using the expected present value of future cash flows method. Significant assumptions used in the cash flow forecasts include future volumes, discount rates, and future capital requirements. Amortization of intangibles with definite lives is calculated using the straight-line method, which is reflective of the benefit pattern in which the estimated economic benefit is expected to be received over the estimated useful life of the intangible asset. Intangibles subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the intangible may not be recoverable. If the sum of the expected undiscounted future cash flows related to the asset is less than the carrying amount of the asset, an impairment loss is recognized based on the fair value of the asset. Intangibles not subject to amortization are tested for impairment annually and when circumstances indicate that the fair value is less than the carrying amount of the intangible. If the fair value is less than the carrying value, an impairment is recorded for the difference. Major Maintenance Activities Costs for planned turnaround and other major maintenance activities are expensed in the period incurred. These types of costs include contractor repair services, materials and supplies, equipment rentals and our labor costs. Environmental Costs Environmental expenditures for additional equipment that mitigates or prevents future contamination or improves environmental safety or efficiency of the existing assets are capitalized. We recognize remediation costs and penalties when the responsibility to remediate is probable and the amount of associated costs can be reasonably estimated. The timing of remediation accruals coincides with completion of a feasibility study or the commitment to a formal plan of action. Remediation liabilities are accrued based on estimates of known environmental exposure and are discounted when the estimated amounts are reasonably fixed and determinable. If recoveries of remediation costs from third parties are probable, a receivable is recorded and is discounted when the estimated amount is reasonably fixed and determinable. Asset Retirement Obligations The fair value of asset retirement obligations is recognized in the period in which the obligations are incurred if a reasonable estimate of fair value can be made. The majority of our recognized asset retirement liability relates to conditional asset retirement obligations for removal and disposal of fire-retardant material from certain refining facilities. The remaining recognized asset retirement liability relates to other refining assets, certain pipelines and processing facilities and other related pipeline assets. The fair values recorded for such obligations are based on the most probable current cost projections. Asset retirement obligations have not been recognized for some assets because the fair value cannot be reasonably estimated since the settlement dates of the obligations are indeterminate. Such obligations will be recognized in the period when sufficient information becomes available to estimate a range of potential settlement dates. The asset retirement obligations principally include the hazardous material disposal and removal or dismantlement requirements associated with the closure of certain refining, terminal, pipeline and processing assets. Our practice is to keep our assets in good operating condition through routine repair and maintenance of component parts in the ordinary course of business and by continuing to make improvements based on technological advances. As a result, we believe that generally these assets have no expected settlement date for purposes of estimating asset retirement obligations since the dates or ranges of dates upon which we would retire these assets cannot be reasonably estimated at this time. Income Taxes Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their tax bases. Deferred tax assets are recorded when it is more likely than not that they will be realized. The realization of deferred tax assets is assessed periodically based on several factors, primarily our expectation to generate sufficient future taxable income. Share-Based Compensation Arrangements The fair value of stock options granted to our employees is estimated on the date of grant using the Black-Scholes option pricing model. The model employs various assumptions based on management’s estimates at the time of grant, which impact the calculation of fair value and ultimately, the amount of expense that is recognized over the vesting period of the stock option award. Of the required assumptions, the expected life of the stock option award and the expected volatility of our stock price have the most significant impact on the fair value calculation. The average expected life is based on our historical employee exercise behavior. The assumption for expected volatility of our stock price reflects a weighting of 50 percent of our common stock implied volatility and 50 percent of our common stock historical volatility. The fair value of restricted stock awards granted to our employees is determined based on the fair market value of our common stock on the date of grant. The fair value of performance unit awards granted to our employees is estimated on the date of grant using a Monte Carlo valuation model. Our share-based compensation expense is recognized based on management’s estimate of the awards that are expected to vest, using the straight-line attribution method for all service-based awards with a graded vesting feature. If actual forfeiture results are different than expected, adjustments to recognized compensation expense may be required in future periods. Unearned share-based compensation is charged to equity when restricted stock awards are granted. Compensation expense is recognized over the vesting period and is adjusted if conditions of the restricted stock award are not met. Business Combinations We recognize and measure the assets acquired and liabilities assumed in a business combination based on their estimated fair values at the acquisition date. Any excess or deficiency of the purchase consideration when compared to the fair value of the net tangible assets acquired, if any, is recorded as goodwill or gain from a bargain purchase. For material acquisitions, management engages an independent valuation specialist to assist with the determination of fair value of the assets acquired, liabilities assumed, noncontrolling interest, if any, and goodwill, based on recognized business valuation methodologies. An income, market or cost valuation method may be utilized to estimate the fair value of the assets acquired, liabilities assumed, and noncontrolling interest, if any, in a business combination. The income valuation method represents the present value of future cash flows over the life of the asset using: (i) discrete financial forecasts, which rely on management’s estimates of revenue and operating expenses; (ii) long-term growth rates; and (iii) appropriate discount rates. The market valuation method uses prices paid for a reasonably similar asset by other purchasers in the market, with adjustments relating to any differences between the assets. The cost valuation method is based on the replacement cost of a comparable asset at prices at the time of the acquisition reduced for depreciation of the asset. If the initial accounting for the business combination is incomplete by the end of the reporting period in which the acquisition occurs, an estimate will be recorded. Subsequent to the acquisition date, and not later than one year from the acquisition date, we will record any material adjustments to the initial estimate based on new information obtained that would have existed as of the date of the acquisition. Any adjustment that arises from information obtained that did not exist as of the date of the acquisition will be recorded in the period of the adjustment. Acquisition-related costs are expensed as incurred in connection with each business combination. Environmental Credits and Obligations In order to comply with certain regulations, specifically the RFS2 requirements implemented by the EPA and the cap-and-trade emission reduction program and low carbon fuel standard implemented by state programs, we are required to reduce our emissions, blend certain levels of biofuels or obtain allowances or credits to offset the obligations created by our operations. In regard to each program, we record an asset, included in other current assets or other noncurrent assets on the consolidated balance sheets, for allowances or credits owned in excess of our anticipated current period compliance requirements. The asset value is based on the product of the excess allowances or credits as of the balance sheet date, if any, and the weighted average cost of those allowances or credits. We record a liability, included in other current liabilities or deferred credits and other liabilities on the consolidated balance sheets, when we are deficient allowances or credits based on the product of the deficient amount as of the balance sheet date, if any, and the market price of the allowances or credits at the balance sheet date. The cost of allowances or credits used for compliance is reflected in cost of revenues on the consolidated statements of income. Any gains or losses on the sale or expiration of allowances or credits are classified as other income on the consolidated statements of income. Proceeds from the sale of allowances or credits are reported in investing activities - all other, net on the consolidated statements of cash flow.

Accounting Standards

Accounting Standards	12 Months Ended
	Dec. 31, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Standards	Accounting Standards Recently Adopted We adopted the following ASU during 2022, which did not have a material impact to our financial statements or financial statement disclosures: ASU Effective Date 2021-10 Government Assistance (Topic 832): Disclosures by Business Entities about Government Assistance January 1, 2022

Short-term Investments

Short-term Investments	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Short-term Investments	Short-Term Investments Investments Components The components of investments were as follows: December 31, 2022 (Millions of dollars) 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 $ 3,074 $ — $ (1) $ 3,073 $ 1,106 $ 1,967 Certificates of deposit and time deposits Level 2 2,093 — — 2,093 1,500 593 U.S. government securities Level 1 1,071 — — 1,071 498 573 Corporate notes and bonds Level 2 66 — — 66 54 12 Total available-for-sale debt securities $ 6,304 $ — $ (1) $ 6,303 $ 3,158 $ 3,145 Cash 5,467 5,467 — Total $ 11,770 $ 8,625 $ 3,145 December 31, 2021 (Millions of dollars) 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 December 31, 2022 were not material. Realized gains/losses were not material. All of our available-for-sale debt securities held as of December 31, 2022 mature within one year or less or are readily available for use.

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2022
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations and Assets Held for Sale	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 The transaction provided for adjustments for working capital and other miscellaneous items, which were finalized with 7-Eleven in the fourth quarter of 2022, resulting in an additional pretax gain of $60 million. 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. (Millions of dollars) 2022 2021 2020 Revenues, other income and net gain on disposal of assets: Revenues and other income $ — $ 8,420 $ 19,919 Net gain on disposal of assets 60 11,682 1 Total revenues, other income and net gain on disposal of assets 60 20,102 19,920 Costs and expenses: Cost of revenues (excludes items below) — 7,654 17,573 Depreciation and amortization — 3 244 Selling, general and administrative expenses — 121 323 Other taxes — 75 193 Total costs and expenses — 7,853 18,333 Income from operations 60 12,249 1,587 Net interest and other financial costs — 6 20 Income before income taxes 60 12,243 1,567 Provision (benefit) for income taxes (12) 3,795 362 Income from discontinued operations, net of tax $ 72 $ 8,448 $ 1,205 Fuel Supply Agreements

Master Limited Partnership

Master Limited Partnership	12 Months Ended
	Dec. 31, 2022
Noncontrolling Interest [Abstract]
Master Limited Partnerships	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 and, as of December 31, 2022, we owned approximately 65 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, which was exhausted during the fourth quarter of 2022. On August 2, 2022 , MPLX announced its board of directors approved an incremental $1.0 billion unit repurchase authorization. The unit repurchase authorizations have no expiration date. MPLX may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, accelerated unit repurchases, tender offers or open market solicitations for units, 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 discontinued at any time. Total unit repurchases were as follows for the respective periods: (In millions, except per share data) 2022 2021 2020 Number of common units repurchased 15 23 1 Cash paid for common units repurchased $ 491 $ 630 $ 33 Average cost per unit $ 31.96 $ 27.52 $ 22.29 As of December 31, 2022, MPLX had approximately $846 million remaining under its unit repurchase authorizations. Redemption of Business from MPLX On July 31, 2020, Western Refining Southwest, Inc. (now known as Western Refining Southwest LLC) (“WRSW”), a wholly owned subsidiary of MPC, entered into a Redemption Agreement (the “Redemption Agreement”) with MPLX, pursuant to which MPLX transferred to WRSW all of the outstanding membership interests in Western Refining Wholesale, LLC, (“WRW”) in exchange for the redemption of MPLX common units held by WRSW. The transaction effected the transfer to MPC of the Western wholesale distribution business that MPLX acquired as a result of its acquisition of Andeavor Logistics LP (“ANDX”). Beginning in the third quarter of 2020, the results of these operations are presented in MPC’s Refining & Marketing segment. At the closing, per the terms of Redemption Agreement, MPLX redeemed 18,582,088 MPLX common units (the “Redeemed Units”) held by WRSW. The number of Redeemed Units was calculated by dividing WRW’s aggregate valuation of $340 million by the simple average of the volume weighted average NYSE prices of an MPLX common unit for the ten trading days ending at market close on July 27, 2020. The transaction resulted in a minor decrease in MPC’s ownership interest in MPLX. Series B Preferred Units As of December 31, 2022, MPLX had 600,000 preferred units (“Series B preferred units) representing limited partner interests of MPLX and having a liquidation value of $1,000 per unit. On February 15, 2023, MPLX exercised its right to redeem all of the Series B preferred units at the redemption price of $1,000 per unit. The Series B preferred units are included in noncontrolling interests on our consolidated balance sheets. 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 interest in MPLX were as follows: (Millions of dollars) 2022 2021 2020 Decrease due to change in ownership $ (164) $ (166) $ (27) Tax impact 44 73 (14) Decrease in MPC's additional paid-in capital, net of tax $ (120) $ (93) $ (41)

Impairments

Impairments	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Impairments	Impairments During 2021, we recognized $69 million of impairment expense within our Midstream segment related to the divestiture, abandonment or closure of certain assets as detailed in the table below. During the first quarter of 2020, the outbreak of COVID-19 caused overall deterioration in the economy and the environment in which we operate. The related changes to our expected future cash flows, as well as a sustained decrease in share price, were considered triggering events requiring the performance of various tests of the carrying values of our assets. Triggering events requiring the performance of various tests of the carrying value of our Midstream assets were also identified by MPLX as a result of the overall deterioration in the economy and the environment in which MPLX and its customers operate, which led to a reduction in forecasted volumes processed by the systems operated by MarkWest Utica EMG, L.L.C., MPLX’s equity method investee, as well as a sustained decrease in the MPLX unit price. These tests resulted in the majority of the impairment charges in 2020, as discussed below. The table below provides information related to the impairments recognized, along with the location of these impairments within the consolidated statements of income. (Millions of dollars) Income Statement Line 2022 2021 2020 Goodwill Impairment expense $ — $ — $ 7,394 Equity method investments Income (loss) from equity method investments — 13 1,315 Long-lived assets Impairment expense (a) — — 1,032 Long-lived assets Depreciation and amortization — 56 — Total impairments $ — $ 69 $ 9,741 (a) The amount of 2020 impairment expense not described in the narrative below is related to certain immaterial Midstream assets. Goodwill During the first quarter of 2020, we recorded an impairment of goodwill of $7.33 billion. The goodwill impairment within the Refining & Marketing segment was primarily driven by the effects of the COVID-19 pandemic and the decline in commodity prices. The impairment within the Midstream segment was primarily driven by additional information related to the slowing of drilling activity, which reduced production growth forecasts from MPLX’s producer customers. During the third quarter of 2020, we recorded an impairment of goodwill of $64 million. The $64 million of goodwill was transferred from our Midstream segment to our Refining & Marketing segment during the third quarter of 2020 in connection with the transfer to MPC of the MPLX wholesale distribution business as described in Note 6. The transfer required goodwill impairment tests for the transferor and transferee reporting units. Our Refining & Marketing reporting unit that recorded the $64 million impairment expense has no remaining goodwill. The fair values of the reporting units for the first quarter of 2020 goodwill impairment analysis were determined based on applying both a discounted cash flow method, or income approach, as well as a market approach. The discounted cash flow fair value estimate is based on known or knowable information at the measurement date. The significant assumptions that were used to develop the estimates of the fair values under the discounted cash flow method included management’s best estimates of the expected future results and discount rates, which range from 9.0 percent to 13.5 percent across all reporting units. Significant assumptions that were used to estimate the MPLX Eastern Gathering and Processing and MPLX Crude Gathering reporting units’ fair values under the discounted cash flow method included management’s best estimates of the discount rate, as well as estimates of future cash flows, which are impacted primarily by producer customer’s development plans, which impact future volumes and capital requirements. Fair value determinations require considerable judgment and are sensitive to changes in underlying assumptions and factors. As a result, there can be no assurance that the estimates and assumptions made for purposes of the interim goodwill impairment test will prove to be an accurate prediction of the future. The fair value measurements for the individual reporting units’ overall fair values represent Level 3 measurements. Equity Method Investments During the first quarter of 2020, we recorded equity method investment impairment charges totaling $1.32 billion, of which $1.25 billion related to MarkWest Utica EMG, L.L.C. and its investment in Ohio Gathering Company, L.L.C. The impairments were largely due to a reduction in forecasted volumes gathered and processed by the systems operated by the equity method investments. The fair value of the investments were determined based upon applying a discounted cash flow method, an income approach. The discounted cash flow fair value estimate is based on known or knowable information at the interim measurement date. The significant assumptions that were used to develop the estimate of the fair value under the discounted cash flow method include management’s best estimates of the expected future cash flows, including prices and volumes, the weighted average cost of capital and the long-term growth rate. Fair value determinations require considerable judgment and are sensitive to changes in underlying assumptions and factors. As a result, there can be no assurance that the estimates and assumptions made for purposes of the impairment test will prove to be an accurate prediction of the future. The fair value of these equity method investments represents a Level 3 measurement. Long-lived Assets Long-lived assets (primarily consisting of property, plant and equipment, intangible assets other than goodwill, and right of use assets) used in operations are assessed for impairment whenever changes in facts and circumstances indicate that the carrying value of the assets may not be recoverable based on the expected undiscounted future cash flow of an asset group. For purposes of impairment evaluation, long-lived assets must be grouped at the lowest level for which independent cash flows can be identified, which generally is the refinery and associated distribution system level for Refining & Marketing segment assets and the plant level or pipeline system level for Midstream segment assets. If the sum of the undiscounted estimated pretax cash flows is less than the carrying value of an asset group, fair value is determined, and the carrying value is written down to the determined fair value. During the first quarter of 2020, we identified long-lived asset impairment triggers relating to all of our refinery asset groups within the Refining & Marketing segment as a result of decreases to the Refining & Marketing segment expected future cash flows. The cash flows associated with these assets were significantly impacted by the effects of the COVID-19 pandemic and commodity price declines. We performed recoverability tests for each refinery asset group by comparing the undiscounted estimated pretax cash flows to the carrying value of each asset group. Only the Gallup refinery’s carrying value exceeded its undiscounted estimated pretax cash flows. It was determined that the fair value of the Gallup refinery’s property, plant and equipment was less than the carrying value. As a result, we recorded a charge of $ 142 million During the second quarter of 2020, we identified long-lived asset impairment triggers relating to all of our refinery asset groups within the Refining & Marketing segment, except the Gallup refinery as it had been impaired to its estimated salvage value in the first quarter, as a result of continued unfavorable macroeconomic conditions impacting the Refining & Marketing segment expected future cash flows. We performed recoverability tests for each refinery asset group by comparing the undiscounted estimated pretax cash flows to the carrying value of each asset group. All of these refinery asset groups’ undiscounted estimated pretax cash flows exceeded their carrying value by at least 17 percent. The determination of undiscounted estimated pretax cash flows for the first and second quarter refinery asset group recoverability tests utilized significant assumptions including management’s best estimates of the expected future cash flows, allocation of certain Refining & Marketing segment cash flows to the individual refinery asset groups, the estimated useful life of certain refinery asset groups, and the estimated salvage value of certain refinery asset groups. On August 3, 2020, we announced our plans to evaluate possibilities to strategically reposition our Martinez refinery, including the potential conversion of the refinery into a renewable diesel facility. The facility is expected to ramp up to producing 730 million gallons per year by the end of 2023, with pretreatment capabilities coming online in 2023. As a result of the progression of these activities, we identified assets that would be repurposed and utilized in a renewable diesel facility configuration and assets that would be abandoned since they had no function in a renewable diesel facility configuration. This change in our intended use for the Martinez refinery is a long-lived asset impairment trigger for the assets that would be repurposed and remain as part of the Martinez asset group. We assessed the asset group for impairment by comparing the undiscounted estimated pretax cash flows to the carrying value of the asset group and the undiscounted estimated pretax cash flows exceeded the Martinez asset group carrying value. We recorded impairment expense of $ 342 million 27 million In the fourth quarter of 2020, we concluded the evaluation of our intended use of MPLX terminal assets near the Gallup refinery and determined that the assets were abandoned, resulting in an impairment charge of $ 67 million 44 million The determinations of expected future cash flows and the salvage values of refineries, as described earlier, require considerable judgment and are sensitive to changes in underlying assumptions and factors. As a result, there can be no assurance that the estimates and assumptions made for purposes of our impairment analysis will prove to be an accurate prediction of the future. Should our assumptions significantly change in future periods, it is possible we may determine the carrying values of certain of our refinery asset groups exceed the undiscounted estimated pretax cash flows of their refinery asset groups, which would result in future impairment charges. During the first quarter of 2020, MPLX identified an impairment trigger relating to asset groups within MPLX’s Western Gathering and Processing (“G&P”) reporting unit as a result of significant changes to expected future cash flows for these asset groups resulting from the effects of the COVID-19 pandemic. The cash flows associated with these assets were significantly impacted by volume declines reflecting decreased forecasted producer customer production as a result of lower commodity prices. MPLX assessed each asset group within the Western G&P reporting unit for impairment. It was determined that the fair value of the East Texas G&P asset group’s underlying assets were less than the carrying value. As a result, MPLX recorded impairment charges totaling $ 350 million

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2022
Equity Method Investments and Joint Ventures [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 29 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 consolidated balance sheets. (Millions of dollars) December 31, December 31, Assets Cash and cash equivalents $ 238 $ 13 Receivables, less allowance for doubtful accounts 747 660 Inventories 148 142 Other current assets 56 55 Equity method investments 4,095 3,981 Property, plant and equipment, net 18,848 20,042 Goodwill 7,645 7,657 Right of use assets 283 268 Other noncurrent assets 1,664 891 Liabilities Accounts payable $ 664 $ 671 Payroll and benefits payable 4 6 Accrued taxes 67 75 Debt due within one year 988 499 Operating lease liabilities 46 59 Other current liabilities 338 304 Long-term debt 18,808 18,072 Deferred income taxes 13 10 Long-term operating lease liabilities 230 205 Deferred credits and other liabilities 366 559 Non-Consolidated VIEs Martinez Renewables LLC On September 21, 2022, MPC closed on the formation of the Martinez Renewable Fuels joint venture (the “Martinez Renewable joint venture”) with Neste Corporation (“Neste”). We determined that, as of the closing date, Martinez Renewables LLC is a VIE because the entity does not have sufficient equity to complete the modification of the plant to produce renewable fuels without additional financial support from its owners. We are not the primary beneficiary of this VIE because we do not have the ability to control the activities that significantly influence the economic outcomes of the entity and, therefore, do not consolidate the entity. Capline LLC Capline LLC is unable to fund its operations without financial support from its equity owners and is a VIE. Our maximum exposure to loss as a result of our involvement with Capline LLC includes our equity method investment, any additional capital contribution commitments and any operating expenses incurred by Capline LLC in excess of compensation received for performance of the operating services. We are not the primary beneficiary of this VIE because we do not have the ability to control the activities that significantly influence the economic outcomes of the entity and, therefore, do not consolidate the entity. Crowley Coastal Partners We have determined that Crowley Coastal Partners LLC (“Crowley Coastal Partners”) is a VIE based on the terms of the existing financing arrangement for Crowley Blue Water Partners LLC (“Crowley Blue Water Partners”) and the associated debt guarantee by MPC and Crowley Maritime Corporation. Our maximum exposure to loss includes our equity method investment in Crowley Coastal Partners and the debt guarantees provided to each of the lenders to Crowley Blue Water Partners. We are not the primary beneficiary of this VIE because we do not have the ability to control the activities that significantly influence the economic outcomes of the entity and, therefore, do not consolidate the entity. MPLX VIEs For those entities that have been deemed to be VIEs, neither MPLX nor any of its subsidiaries have been deemed to be the primary beneficiary due to voting rights on significant matters. While we have the ability to exercise influence through participation in the management committees which make all significant decisions, we have equal influence over each committee as a joint interest partner and all significant decisions require the consent of the other investors without regard to economic interest and as such we have determined that these entities should not be consolidated and apply the equity method of accounting with respect to our investments in each entity. Sherwood Midstream LLC (“Sherwood Midstream”) has been deemed the primary beneficiary of Sherwood Midstream Holdings LLC (“Sherwood Midstream Holdings”) due to its controlling financial interest through its authority to manage the joint venture. As a result, Sherwood Midstream consolidates Sherwood Midstream Holdings. MPLX’s maximum exposure to loss as a result of its involvement with equity method investments includes its equity investment, any additional capital contribution commitments and any operating expenses incurred by the subsidiary operator in excess of its compensation received for the performance of the operating services. We account for our ownership interest in each of these investments as an equity method investment. See Note 16 for ownership percentages and investment balances and Note 29 for our exposure to guarantees related to our non-consolidated VIEs.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Transactions with related parties were as follows: (Millions of dollars) 2022 2021 2020 Sales to related parties $ 144 $ 93 $ 123 Purchases from related parties 1,175 962 738 Sales to related parties, which are included in sales and other operating revenues, consist primarily of refined product sales and renewable feedstock sales to certain of our equity affiliates.

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Earnings per Share	Earnings Per Share We compute basic earnings (loss) per share by dividing net income (loss) 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 (loss) per share using the two-class method. Diluted income (loss) per share assumes exercise of certain share-based compensation awards, provided the effect is not anti-dilutive. (In millions, except per share data) 2022 2021 2020 Income (loss) from continuing operations, net of tax $ 15,978 $ 2,553 $ (11,182) Less: Net income (loss) attributable to noncontrolling interest 1,534 1,263 (151) Net income allocated to participating securities 8 2 1 Income (loss) from continuing operations available to common stockholders 14,436 1,288 (11,032) Income from discontinued operations, net of tax 72 8,448 1,205 Income (loss) available to common stockholders $ 14,508 $ 9,736 $ (9,827) Weighted average common shares outstanding: Basic 512 634 649 Effect of dilutive securities 4 4 — Diluted 516 638 649 (In millions, except per share data) 2022 2021 2020 Income (loss) available to common stockholders per share: Basic: Continuing operations $ 28.17 $ 2.03 $ (16.99) Discontinued operations 0.14 13.31 1.86 Net income (loss) per share $ 28.31 $ 15.34 $ (15.13) Diluted: Continuing operations $ 27.98 $ 2.02 $ (16.99) Discontinued operations 0.14 13.22 1.86 Net income (loss) per share $ 28.12 $ 15.24 $ (15.13) The following table summarizes the shares that were anti-dilutive, and therefore, were excluded from the diluted share calculation. (In millions) 2022 2021 2020 Shares issuable under share-based compensation plans — 3 11

Equity

Equity	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Equity	Equity We announced our board of directors approved a $5.0 billion share repurchase authorization on February 2, 2022, which was exhausted during the fourth quarter of 2022, and an additional $5.0 billion share repurchase authorization on August 2, 2022. These authorization have 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: (In millions, except per share data) 2022 2021 2020 Number of shares repurchased 131 76 — Cash paid for shares repurchased $ 11,922 $ 4,654 $ — Average cost per share $ 91.20 $ 62.65 $ —

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 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 (loss) from continuing operations before income taxes and excluded from 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) 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. (Millions of dollars) 2022 2021 2020 Segment adjusted EBITDA for reportable segments Refining & Marketing 19,261 $ 3,518 $ (1,939) Midstream 5,772 5,410 5,061 Total reportable segments $ 25,033 $ 8,928 $ 3,122 Reconciliation of segment adjusted EBITDA for reportable segments to income (loss) from continuing operations before income taxes Total reportable segments $ 25,033 $ 8,928 $ 3,122 Corporate (698) (587) (635) Refining planned turnaround costs (1,122) (582) (832) Storm impacts — (70) — LIFO inventory (charge) credit 148 — (561) Gain on sale of assets (a) 1,058 — 66 Renewable volume obligation requirements (b) 238 — — Litigation 27 — 84 Impairments (c) — (13) (9,741) Idling facility expenses — (12) — Restructuring expenses (d) — — (367) Transaction related costs (e) — — (8) Depreciation and amortization (3,215) (3,364) (3,375) Net interest and other financial costs (1,000) (1,483) (1,365) Income (loss) from continuing operations before income taxes $ 20,469 $ 2,817 $ (13,612) (a) 2022 includes the non-cash gain related to the contribution of assets by MPC on the formation of the Martinez Renewables joint venture and the non-cash gain on lease reclassification. See Note 16 and 28 for additional information. (b) Represents retroactive changes in renewable volume obligation requirements published by the EPA in June 2022 for the 2020 and 2021 annual obligations. (c) 2021 reflects impairments of equity method investments. 2020 reflects impairments of goodwill, equity method investments and long lived assets. See Note 7. (d) See Note 19. (e) 2020 includes costs incurred in connection with the Midstream strategic review and other related efforts. Costs incurred in connection with the Speedway separation are included in discontinued operations. See Note 5. (Millions of dollars) 2022 2021 2020 Sales and other operating revenues Refining & Marketing Revenues from external customers (a) $ 172,087 $ 115,350 $ 66,180 Intersegment revenues 118 144 67 Refining & Marketing segment revenues 172,205 115,494 66,247 Midstream Revenues from external customers (a) 5,366 4,633 3,599 Intersegment revenues 5,224 4,986 4,839 Midstream segment revenues 10,590 9,619 8,438 Total segment revenues 182,795 125,113 74,685 Less: intersegment revenues 5,342 5,130 4,906 Consolidated sales and other operating revenues $ 177,453 $ 119,983 $ 69,779 (a) Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 5 and 9 for additional information. (Millions of dollars) 2022 2021 2020 Income (loss) from equity method investments Refining & Marketing $ 31 $ 59 $ 2 Midstream 624 412 378 Corporate (a) — (13) (1,315) Consolidated income (loss) from equity method investments $ 655 $ 458 $ (935) Depreciation and amortization Refining & Marketing $ 1,850 $ 1,870 $ 1,857 Midstream 1,310 1,329 1,353 Corporate (b) 55 165 165 Consolidated depreciation and amortization $ 3,215 $ 3,364 $ 3,375 Capital expenditures Refining & Marketing $ 1,508 $ 911 $ 1,170 Midstream 1,069 731 1,398 Segment capital expenditures and investments 2,577 1,642 2,568 Less investments in equity method investees 405 210 485 Plus: Corporate 108 105 80 Capitalized interest 103 68 106 Consolidated capital expenditures (c) $ 2,383 $ 1,605 $ 2,269 (a) Impairment of equity method investment. See Note 7. (b) 2021 includes an impairment of $ 56 million (c) Includes changes in capital expenditure accruals. See Note 24 for a reconciliation of total capital expenditures to additions to property, plant and equipment as reported in the consolidated statements of cash flows. Since we will continue to supply fuel to Speedway subsequent to the sale to 7-Eleven, we have reported intersegment sales to Speedway, that were previously eliminated in consolidation, as third-party sales. All periods presented have been retrospectively adjusted through the sale date of May 14, 2021 to reflect this change. Sales to Speedway/7-Eleven from the Refining & Marketing segment represented 10 percent, 11 percent and 11 percent of our total annual revenues for the years ended December 31, 2022, 2021 and 2020, respectively. See Note 23 for the disaggregation of our revenue by segment and product line.

Net Interest and Other Financia

Net Interest and Other Financial Costs	12 Months Ended
	Dec. 31, 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: (Millions of dollars) 2022 2021 2020 Interest income $ (191) $ (14) $ (9) Interest expense 1,299 1,340 1,462 Interest capitalized (104) (73) (129) Pension and other postretirement non-service costs (a) 3 64 11 (Gain) loss on extinguishment of debt 2 133 (9) Investments - net premium (discount) amortization (30) (1) — Other financial costs 21 34 39 Net interest and other financial costs $ 1,000 $ 1,483 $ 1,365

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision (benefit) for income taxes from continuing operations consisted of: (Millions of dollars) 2022 2021 2020 Current: Federal $ 3,565 $ 380 $ (2,267) State and local 629 48 69 Foreign 7 5 9 Total current 4,201 433 (2,189) Deferred: Federal 191 (164) 90 State and local 98 (6) (347) Foreign 1 1 16 Total deferred 290 (169) (241) Income tax provision (benefit) $ 4,491 $ 264 $ (2,430) Our effective tax rate for the year ended December 31, 2022 was higher than the tax computed at the U.S. statutory rate primarily due to state taxes, partially offset by permanent tax benefits related to net income attributable to noncontrolling interests. Our effective tax rate for the year ended December 31, 2021 was lower than the tax computed at the U.S. statutory rate primarily due to permanent tax benefits related to net income attributable to noncontrolling interests and an increase in benefit related to the net operating loss (“NOL”) carryback provided under the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”), partially offset by state taxes and local income taxes. Our effective income tax benefit rate for the year ended December 31, 2020 was lower than the tax benefit computed at the U.S. statutory rate due to a significant amount of our pre-tax loss consisting of non-deductible goodwill impairment charges, partially offset by the tax rate differential resulting from the NOL carryback provided under the CARES Act. Additionally, our non-controlling interest in MPLX generally provides an effective tax rate benefit since the tax associated with these ownership interests is paid by those interests, but this benefit was lower for the year ended December 31, 2020 due to impairment charges recorded by MPLX. A reconciliation of the federal statutory income tax rate to the effective tax rate applied to income (loss) from continuing operations before income taxes follows: 2022 2021 2020 Federal statutory rate 21 % 21 % 21 % State and local income taxes, net of federal income tax effects 3 2 2 Goodwill impairment — — (8) Noncontrolling interests (2) (9) — Legislation — (3) 4 Other — (2) (1) Effective tax rate applied to income (loss) from continuing operations before income taxes 22 % 9 % 18 % On March 27, 2020, the CARES Act was enacted by Congress and signed into law by President Trump in response to the COVID-19 pandemic. The CARES Act contained a NOL carryback provision which allowed MPC to carryback our 2020 taxable loss to 2015 and later years. The five-year NOL carryback is available for all businesses producing taxable losses in 2018 through 2020. Based on the NOL carryback, as provided by the CARES Act, we realized a cumulative income tax benefit of $2.30 billion. We received $1.55 billion of the income tax benefit in cash during the fourth quarter of 2021, an additional $690 million was realized as an offset to 2021 income tax liability payment obligations and we expect to receive the remaining $59 million refund during 2023. Deferred tax assets and liabilities resulted from the following: December 31, (Millions of dollars) 2022 2021 Deferred tax assets: Employee benefits $ 481 $ 495 Environmental remediation 84 91 Finance lease obligations 371 339 Operating lease liabilities 224 263 Net operating loss carryforwards 44 122 Tax credit carryforwards 20 19 Goodwill and other intangibles 56 35 Other 44 58 Total deferred tax assets 1,324 1,422 Deferred tax liabilities: Property, plant and equipment 2,656 2,716 Inventories 686 717 Investments in subsidiaries and affiliates 3,660 3,350 Right of use assets 223 257 Other 2 18 Total deferred tax liabilities 7,227 7,058 Net deferred tax liabilities $ 5,903 $ 5,636 Net deferred tax liabilities were classified in the consolidated balance sheets as follows: December 31, (Millions of dollars) 2022 2021 Assets: Other noncurrent assets $ 1 $ 2 Liabilities: Deferred income taxes 5,904 5,638 Net deferred tax liabilities $ 5,903 $ 5,636 At both December 31, 2022 and 2021, federal operating loss carryforwards were $4 million, which includes a mix of indefinite carryforward ability and expiration periods ranging from 2032 through 2037. As of December 31, 2022 and 2021, state and local operating loss and tax credit carryforwards were $40 million and $128 million, respectively, which includes a mix of indefinite carryforward ability and expiration periods ranging from 2023 through 2040. As of December 31, 2022 and 2021, foreign operating loss carryforwards were $20 million and $9 million, respectively, which includes expiration periods ranging from 2029 through 2043. As of December 31, 2022 and 2021, $49 million and $38 million of valuation allowances have been recorded related to income taxes, primarily related to realizability foreign tax operating losses and related deferred tax assets. MPC is continuously undergoing examination of its U.S. federal income tax returns by the Internal Revenue Service (“IRS”). Since 2012, we have continued to participate in the Compliance Assurance Process (“CAP”). CAP is a real-time audit of the U.S. Federal income tax return that allows the IRS, working in conjunction with MPC, to determine tax return compliance with the U.S. Federal tax law prior to filing the return. This program provides us with greater certainty about our tax liability for years under examination by the IRS. During the fourth quarter of 2021, an IRS audit was initiated for MPLX and its subsidiaries for the tax year 2019 and continued during 2022. We do not believe the eventual outcome of such audit will have a material impact on our financial statements as of December 31, 2022. Further, we are routinely involved in U.S. state income tax audits. We believe all other audits will be resolved with the amounts provided for these liabilities. As of December 31, 2022, we have various state and local income tax returns subject to examination for years 2006 through 2021, depending on jurisdiction. The following table summarizes the activity in unrecognized tax benefits: (Millions of dollars) 2022 2021 2020 January 1 balance $ 37 $ 23 $ 32 Additions for tax positions of current year — 6 — Additions for tax positions of prior years 38 19 12 Reductions for tax positions of prior years (2) (4) (18) Settlements (15) (6) (3) Statute of limitations (1) (1) — December 31 balance $ 57 $ 37 $ 23 If the unrecognized tax benefits as of December 31, 2022 were recognized, $49 million would affect our effective income tax rate. There were $29 million of uncertain tax positions as of December 31, 2022 for which it is reasonably possible that the amount of unrecognized tax benefits would significantly decrease during the next twelve months. Interest and penalties related to income taxes are recorded as part of the provision for income taxes. Such interest and penalties were net expenses (benefits) of $1 million, $(2) million and $(19) million in 2022, 2021 and 2020, respectively. As of December 31, 2022 and 2021, $4 million and $6 million of interest and penalties receivables (payables) were accrued related to income taxes, respectively.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Inventories	Inventories December 31, (Millions of dollars) 2022 2021 Crude oil $ 3,047 $ 2,639 Refined products 4,748 4,460 Materials and supplies 1,032 956 Total $ 8,827 $ 8,055 The LIFO method accounted for 88 percent of total inventory value at both December 31, 2022 and 2021. Current acquisition costs were estimated to exceed the LIFO inventory value by $3.72 billion as of December 31, 2022. There was $2.84 billion excess of replacement or current cost over our stated LIFO cost at December 31, 2021. The cost of inventories of crude oil and refined products is determined primarily under the LIFO method.

Equity Method Investments

Equity Method Investments	12 Months Ended
	Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	Equity Method Investments Crowley Ocean Partners Crowley Coastal Partners was formed in May 2016 to own both Crowley Ocean Partners LLC (“Crowley Ocean Partners”) and Crowley Blue Waters Partners. MPC accounts for our 50 percent ownership in Crowley Coastal Partners as an equity method investment. On December 1, 2022, MPC purchased all of Crowley Coastal Partner’s interest in Crowley Ocean Partners and its four subsidiaries for approximately $485 million, which included $196 million to pay off the debt associated with the four tankers. As a result of the transaction, Crowley Ocean Partners is now included in our consolidated results. MPC will continue to account for its 50 percent interest in Crowley Coastal Partners as an equity method investment. The excess of the $144 million fair value over the $125 million book value of our 50 percent indirect interest in Crowley Ocean Partners resulted in a $19 million gain, which is included in the income (loss) from equity method investments line of the accompanying consolidated statements of income. Martinez Renewables LLC On September 21, 2022, MPC closed on the formation of the Martinez Renewable joint venture. MPC contributed property, plant and equipment, inventory, and working capital with an estimated fair value of $1.47 billion and Neste contributed $728 million in cash. MPC recorded a non-cash gain of $549 million resulting from the difference between the carrying value and fair value of the contributed property, plant and equipment and inventory. Subsequent to the closing, the joint venture paid a special distribution to MPC of $500 million, which is reflected as a return of capital in MPC’s consolidated statements of cash flows. After the special distribution, MPC’s investment value in the entity was approximately $971 million. We apply the equity method of accounting with respect to our investment in the entity. Watson Cogeneration Company On June 1, 2022, MPC purchased the remaining 49 percent interest in Watson Cogeneration Company from NRG Energy, Inc. for approximately $59 million. This entity is now consolidated and included in our consolidated results. It was previously accounted for as an equity method investment. The excess of the $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. Ownership as of Carrying value at December 31, December 31, (In millions of dollars, except ownership percentages) VIE 2022 2022 2021 Refining & Marketing The Andersons Marathon Holdings LLC 50% $ 204 $ 194 Martinez Renewables LLC X 50% 1,070 — Watson Cogeneration Company —% — 28 Other (a) X 54 19 Refining & Marketing Total $ 1,328 $ 241 Midstream MPLX Andeavor Logistics Rio Pipeline LLC X 67% $ 177 $ 183 Centrahoma Processing LLC 40% 131 133 Illinois Extension Pipeline Company, L.L.C 35% 236 243 LOOP LLC 41% 287 265 MarEn Bakken Company LLC 25% 475 449 MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. X 67% 335 332 MarkWest Torñado GP, L.L.C. X 60% 306 246 MarkWest Utica EMG, L.L.C. X 57% 669 680 Minnesota Pipe Line Company, LLC 17% 178 183 Rendezvous Gas Services, L.L.C. X 78% 137 147 Sherwood Midstream Holdings LLC X 51% 125 136 Sherwood Midstream LLC X 50% 512 544 Whistler Pipeline LLC X 38% 211 155 Other (a) X 316 285 MPLX Total $ 4,095 $ 3,981 MPC-Retained Capline Pipeline Company LLC X 33% $ 404 $ 399 Crowley Coastal Partners, LLC X 50% 55 185 Gray Oak Pipeline, LLC 25% 302 318 LOOP LLC 10% 71 66 South Texas Gateway Terminal LLC 25% 170 173 Other (a) X 41 46 MPC-Retained Total $ 1,043 $ 1,187 Midstream Total $ 5,138 $ 5,168 Total $ 6,466 $ 5,409 (a) Some investments included within “Other” have been deemed to be VIEs. Summarized financial information for all equity method investments in affiliated companies, combined, was as follows: (Millions of dollars) 2022 2021 2020 Income statement data: Revenues and other income $ 5,069 $ 4,343 $ 3,013 Income from operations 1,907 1,389 599 Net income 1,740 1,230 454 Balance sheet data – December 31: Current assets $ 1,811 $ 1,233 Noncurrent assets 20,324 18,071 Current liabilities 1,478 801 Noncurrent liabilities 4,750 5,141 As of December 31, 2022, the carrying value of our equity method investments was $304 million higher than the underlying net assets of investees. This basis difference is being amortized into net income over the remaining estimated useful lives of the underlying net assets, except for $208 million of excess related to goodwill and other non-depreciable assets. Dividends and partnership distributions received from equity method investees (excluding distributions that represented a return of capital previously contributed) were $772 million, $652 million and $577 million in 2022, 2021 and 2020, respectively. See Note 7 for information regarding impairments of equity method investments.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment December 31, 2022 December 31, 2021 (Millions of dollars) Gross Accumulated Depreciation Net Gross Accumulated Depreciation Net Refining & Marketing $ 32,292 $ 16,745 $ 15,547 $ 31,089 $ 14,876 $ 16,213 Midstream 27,659 8,118 19,541 28,098 7,384 20,714 Corporate 1,550 981 569 1,446 933 513 Total (a) $ 61,501 $ 25,844 $ 35,657 $ 60,633 $ 23,193 $ 37,440 (a) Includes finance leases. See Note 28. Property, plant and equipment includes construction in progress of $2.29 billion and $2.27 billion at December 31, 2022 and 2021, respectively, which primarily relates to capital projects at our refineries and midstream facilities.

Goodwill and Intangibles

Goodwill and Intangibles	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles	Goodwill and Intangibles Goodwill MPC annually evaluates goodwill for impairment as of November 30, as well as whenever events or changes in circumstances indicate it is more likely than not that the fair value of a reporting unit with goodwill is less than its carrying amount. There were no impairments of goodwill required based on our annual test of goodwill in 2022 and 2021. At December 31, 2022, MPC had four reporting units with goodwill totaling approximately $8.24 billion. For the annual impairment assessment as of November 30, 2022, management performed only a qualitative assessment for three reporting units as we determined it was more likely than not that the fair value of the reporting units exceeded the carrying value. A quantitative assessment was performed for the remaining reporting unit, which resulted in the fair value of the reporting unit exceeding its carrying value by greater than 10 percent. The changes in the carrying amount of goodwill for 2022 were as follows: (Millions of dollars) Refining & Marketing Midstream Total Balance as of December 31, 2020 $ 561 $ 7,695 $ 8,256 Impairment losses — — — Balance as of December 31, 2021 561 7,695 8,256 Impairment losses — — — Disposal of assets — (12) (12) Balance as of December 31, 2022 $ 561 $ 7,683 $ 8,244 Gross goodwill as of December 31, 2022 $ 6,141 $ 10,824 $ 16,965 Accumulated impairment losses (5,580) (3,141) (8,721) Balance as of December 31, 2022 $ 561 $ 7,683 $ 8,244 Intangible Assets Our definite lived intangible assets as of December 31, 2022 and 2021 are as shown below. December 31, 2022 December 31, 2021 (Millions of dollars) Gross Accumulated Amortization Net Gross Accumulated Amortization Net Customer contracts and relationships $ 3,624 $ 1,825 $ 1,799 $ 3,495 $ 1,457 $ 2,038 Brand rights and tradenames 100 64 36 100 50 50 Royalty agreements 138 103 35 135 96 39 Other 36 30 6 36 28 8 Total $ 3,898 $ 2,022 $ 1,876 $ 3,766 $ 1,631 $ 2,135 At both December 31, 2022 and 2021, we had indefinite lived intangible assets of $71 million, which are emission allowance credits. Amortization expense for 2022 and 2021 was $316 million and $330 million, respectively. Estimated future amortization expense for the next five years related to the intangible assets at December 31, 2022 is as follows: (Millions of dollars) 2023 $ 315 2024 257 2025 241 2026 221 2027 193

Restructuring

Restructuring	12 Months Ended
	Dec. 31, 2022
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring During the third quarter of 2020, we indefinitely idled our refinery located in Gallup, New Mexico and initiated actions to strategically reposition our Martinez, California refinery to a renewable diesel facility. We also approved an involuntary workforce reduction plan. In connection with these strategic actions, we recorded restructuring expenses of $367 million in 2020. The indefinite idling of the Gallup refinery and actions to strategically reposition the Martinez refinery to a renewable diesel facility resulted in $195 million of restructuring expenses. Of the $195 million of restructuring expenses, we expect $130 million to settle in cash for costs related to decommissioning refinery processing units and storage tanks and fulfilling environmental remediation obligations. Additionally, we recorded a non-cash reserve against our materials and supplies inventory at these facilities of $51 million. The involuntary workforce reduction plan, together with employee reductions resulting from our actions affecting the Gallup and Martinez refineries, affected approximately 2,050 employees. We recorded $172 million of restructuring expenses for separation benefits payable under our employee separation plan and certain collective bargaining agreements that we expect to settle in cash. Certain of the affected MPC employees provided services to MPLX. MPLX has various employee services agreements and secondment agreements with MPC pursuant to which MPLX reimburses MPC for employee costs, along with the provision of operational and management services in support of MPLX’s operations. Pursuant to such agreements, MPC was reimbursed by MPLX for $37 million of the $172 million of restructuring expenses recorded for these actions. Restructuring expenses were accrued as restructuring reserves within accounts payable, payroll and benefits payable, other current liabilities and deferred credits and other liabilities within our consolidated balance sheets. We expect cash payments for the remaining exit and disposal costs reserve to occur through 2024. (Millions of dollars) Employee separation costs Exit and disposal costs Total Restructuring reserve balance at September 30, 2020 (a) $ 158 $ 133 $ 291 Adjustments 14 5 19 Cash payments (134) (35) (169) Restructuring reserve balance at December 31, 2020 38 103 141 Cash payments (38) (44) (82) Restructuring reserve balance at December 31, 2021 — 59 59 Cash payments — (13) (13) Restructuring reserve balance at December 31, 2022 $ — $ 46 $ 46 (a) The restructuring reserve was zero until the third quarter of 2020.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 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 December 31, 2022 and 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. December 31, 2022 Fair Value Hierarchy (Millions of dollars) Level 1 Level 2 Level 3 Netting and Collateral (a) Net Carrying Value on Balance Sheet (b) Collateral Pledged Not Offset Assets: Commodity contracts $ 310 $ — $ — $ (243) $ 67 $ 100 Liabilities: Commodity contracts $ 301 $ — $ — $ (301) $ — $ — Embedded derivatives in commodity contracts — — 61 — 61 — December 31, 2021 Fair Value Hierarchy (Millions of dollars) 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 December 31, 2022, cash collateral of $58 million was netted with mark-to-market 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 which are subject to master netting arrangements reflected gross on the balance sheet. Level 3 instruments relate to an embedded derivative liability for a natural gas purchase commitment embedded in a keep‑whole processing agreement. The fair value calculation for these Level 3 instruments at December 31, 2022 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.68 to $1.62 per gallon with a weighted average of $0.84 per gallon and (2) the probability of renewal of 100 percent for the five-year term of the natural gas purchase agreement and the related keep-whole processing agreement. Increases or decreases in the fractionation spread result in an increase or decrease in the fair value of the embedded derivative liability. The following is a reconciliation of the beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy. (Millions of dollars) 2022 2021 Beginning balance $ 108 $ 63 Unrealized and realized (gain)/loss included in net income (35) 59 Settlements of derivative instruments (12) (14) Ending balance $ 61 $ 108 The amount of total (gain)/ loss for the period included in earnings attributable to the change in unrealized (gain)/loss relating to liabilities still held at the end of period: $ (33) $ 47 See Note 21 for the income statement impacts of our derivative instruments. Fair Values – Non-recurring Non-recurring fair value measurements and disclosures relate primarily to sales-type leases discussed in Note 28 and the Martinez Renewables LLC equity method investment discussed in Note 16. The net investment in sales-type leases was recorded at the estimated fair value of the underlying leased assets at contract modification date. The leased assets were valued using a cost method valuation approach which utilizes Level 3 inputs. The fair value of the Martinez Renewables LLC equity method investment was primarily based on the cash consideration received from Neste for their 50 percent ownership. 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 $24.0 billion at December 31, 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	12 Months Ended
	Dec. 31, 2022
Summary of Derivative Instruments [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 20. See Note 2 for a discussion of the types of derivatives we use and the reasons for them. We do not designate any of our commodity derivative instruments as hedges for accounting purposes. The following table presents the fair value of derivative instruments as of December 31, 2022 and 2021 and the line items in the consolidated 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. (Millions of dollars) December 31, 2022 December 31, 2021 Balance Sheet Location Asset Liability Asset Liability Commodity derivatives Other current assets $ 310 $ 301 $ 271 $ 249 Other current liabilities (a) — 10 — 15 Deferred credits and other liabilities (a) — 51 — 93 (a) Includes embedded derivatives. The table below summarizes open commodity derivative contracts for crude oil, refined products and blending products as of December 31, 2022. Percentage of contracts that expire next quarter Position (Units in thousands of barrels) Long Short Exchange-traded (a) Crude oil 65.1% 69,275 82,639 Refined products 76.6% 16,669 9,226 Blending products 98.8% 1,443 4,885 Soybean oil 53.5% 2,103 2,623 (a) Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 29,651 long and 29,876 short; Refined products - 1,390 long and 25 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: (Millions of dollars) Gain (Loss) Income Statement Location 2022 2021 2020 Sales and other operating revenues $ — $ (47) $ 72 Cost of revenues (58) (333) 34 Other income — — 1 Total $ (58) $ (380) $ 107

Debt

Debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt	Debt Our outstanding borrowings at December 31, 2022 and 2021 consisted of the following: (Millions of dollars) December 31, December 31, Marathon Petroleum Corporation: Senior notes $ 6,449 $ 6,449 Notes payable 1 1 Finance lease obligations 522 589 Total 6,972 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 27,080 25,948 Unamortized debt issuance costs (142) (129) Unamortized discount, net of unamortized premium (238) (280) Amounts due within one year (1,066) (571) Total long-term debt due after one year $ 25,634 $ 24,968 Commercial Paper On February 26, 2016, we established a commercial paper program that allows us to have a maximum of $2.0 billion in commercial paper outstanding, with maturities up to 397 days from the date of issuance. We do not intend to have outstanding commercial paper borrowings in excess of available capacity under the MPC Credit Agreement. MPC Senior Notes December 31, (Millions of dollars) 2022 2021 Senior notes, 3.625% due September 2024 750 750 Senior notes, 4.700% due May 2025 1,250 1,250 Senior notes, 5.125% due December 2026 719 719 Senior notes, 3.800% due April 2028 496 496 Senior notes, 6.500% due March 2041 1,250 1,250 Senior notes, 4.750% due September 2044 800 800 Senior notes, 5.850% due December 2045 250 250 Senior notes, 4.500% due April 2048 498 498 Andeavor senior notes, 3.800% - 5.125% due 2026 – 2048 36 36 Senior notes, 5.000%, due September 2054 400 400 Total $ 6,449 $ 6,449 2021 Activity On March 1, 2021, we repaid the $1.0 billion outstanding aggregate principal amount of 5.125% senior notes due March 2021. In June 2021, all of the $300 million outstanding aggregate principal amount of 5.125% senior notes due April 2024, including the portion of such notes for which Andeavor was the obligor, were redeemed at a price equal to 100.854% of the principal amount, plus accrued and unpaid interest to, but not including, the redemption date. On December 2, 2021, all of the $1.25 billion outstanding aggregate principal amount 4.5% senior notes due May 2023 and the $850 million outstanding aggregate principal amount of 4.75% senior notes due December 2023, including the portion of such notes for which Andeavor was the obligor, were redeemed at a price equal to par, plus a make-whole premium and accrued and unpaid interest to, but not including, the redemption date. The payment of $132 million related to the note premium, offset by the immediate expense recognition of $6 million of unamortized debt premium and issuance costs, resulted in a loss on extinguishment of debt of $126 million. Interest on each series of senior notes is payable semi-annually in arrears. The MPC senior notes are unsecured and unsubordinated obligations of MPC and rank equally with all of MPC’s other existing and future unsecured and unsubordinated indebtedness. The MPC senior notes are non-recourse and structurally subordinated to the indebtedness of our subsidiaries, including the outstanding indebtedness of Andeavor and MPLX. The Andeavor senior notes are unsecured, unsubordinated obligations of Andeavor and are non-recourse to MPC and any of MPC’s subsidiaries other than Andeavor. MPLX Senior Notes December 31, (Millions of dollars) 2022 2021 Senior notes, 3.500% due December 2022 $ — $ 486 Senior notes, 3.375% due March 2023 — 500 Senior notes, 4.500% due July 2023 989 989 Senior notes, 4.875% due December 2024 1,149 1,149 Senior notes, 4.000% due February 2025 500 500 Senior notes, 4.875% due June 2025 1,189 1,189 MarkWest senior notes, 4.500% - 4.875% due 2023 – 2025 23 23 Senior notes, 1.750% due March 2026 1,500 1,500 Senior notes, 4.125% due March 2027 1,250 1,250 Senior notes, 4.250% due December 2027 732 732 Senior notes, 4.000% due March 2028 1,250 1,250 Senior notes, 4.800% due February 2029 750 750 Senior notes, 2.650% due August 2030 1,500 1,500 December 31, (Millions of dollars) 2022 2021 Senior notes, 4.950% due September 2032 1,000 — Senior notes, 4.500% due April 2038 1,750 1,750 Senior notes, 5.200% due March 2047 1,000 1,000 Senior notes, 5.200% due December 2047 487 487 ANDX senior notes, 3.500% - 5.250% due 2022 – 2047 31 45 Senior notes, 4.700% due April 2048 1,500 1,500 Senior notes, 5.500% due February 2049 1,500 1,500 Senior notes, 4.950% due March 2052 1,500 — Senior notes, 4.900% due April 2058 500 500 Total $ 20,100 $ 18,600 2022 Activity 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 under the previous MPLX credit agreement. On August 11, 2022, MPLX issued $1.0 billion aggregate principal amount of 4.950% senior notes due September 2032 in an underwritten public offering. The net proceeds were used to redeem all of the $500 million aggregate principal amount of 3.500% senior notes due December 2022, $14 million of which was issued by Andeavor Logistics LP, and to redeem all of the $500 million aggregate principal amount of 3.375% senior notes due March 2023. 2021 Activity On January 15, 2021, MPLX redeemed all the $750 million outstanding aggregate principal amount of 5.250% senior notes due January 2025, including the portion of such notes issued by ANDX, at a price equal to 102.625% of the principal amount, plus accrued and unpaid interest to, but not including, the redemption date. On September 3, 2021, MPLX redeemed, at par value, all of the $1.0 billion aggregate principal amount of floating rate senior notes due September 2022, plus accrued and unpaid interest to, but not including, the redemption date. MPLX primarily funded the redemption with borrowings under the MPC intercompany loan agreement. Interest on each series of MPLX fixed rate senior notes is payable semi-annually in arrears. The MPLX senior notes are unsecured, unsubordinated obligations of MPLX and are non-recourse to MPC and its subsidiaries other than MPLX and MPLX GP LLC, as the general partner of MPLX. Schedule of Maturities Principal maturities of long-term debt, excluding finance lease obligations, as of December 31, 2022 for the next five years are as follows: (Millions of dollars) 2023 $ 1,000 2024 1,901 2025 2,950 2026 2,249 2027 2,000 Available Capacity under our Facilities as of December 31, 2022 (Millions of dollars) Total Outstanding Outstanding Available Weighted Expiration MPC, excluding MPLX MPC bank revolving credit facility $ 5,000 $ — $ 1 $ 4,999 — July 2027 MPC trade receivables securitization facility (a) 100 — 100 — — September 2023 MPLX MPLX bank revolving credit facility 2,000 — — 2,000 — July 2027 (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 December 31, 2022, letters of credit in the total amount of $1.05 billion 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. MPC Bank Revolving Credit Facility On July 7, 2022, MPC entered into a new five-year revolving credit agreement (the “MPC Credit Agreement”) to replace its previous $5.0 billion credit facility that was scheduled to expire in October 2023. The MPC Credit Agreement, among other things, provides for a $5.0 billion unsecured revolving credit facility that matures in July 2027 and letter of credit issuing capacity under the facility of up to $2.2 billion. Letters of credit issuing capacity is included in, not in addition to, the $5.0 billion borrowing capacity. The financial covenants of the MPC Credit Agreement are substantially the same as those contained in the previous credit agreement. MPC has an option under the MPC Credit Agreement to increase the aggregate commitments by up to an additional $1.0 billion, subject to, among other conditions, the consent of the lenders whose commitments would be increased. In addition, the maturity date may be extended, for up to two additional one year periods, subject to, among other conditions, the approval of lenders holding the majority of the commitments then outstanding, provided that the commitments of any non-consenting lenders will terminate on the then-effective maturity date. The MPC Credit Agreement includes sub-facilities for swing-line loans of up to $250 million and letters of credit of up to $2.2 billion (which may be increased to up to $3.0 billion upon receipt of additional letter of credit issuing commitments). Borrowings under the MPC Credit Agreement bear interest, at our election, at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the MPC Credit Agreement, plus an applicable margin. We are charged various fees and expenses in connection with the agreement, including administrative agent fees, commitment fees on the unused portion of the commitments and fees with respect to issued and outstanding letters of credit. The applicable margins to the benchmark interest rates and the commitment fees payable under the MPC Credit Agreement fluctuate based on changes, if any, to our credit ratings. The MPC Credit Agreement contains certain representations and warranties, affirmative and restrictive covenants and events of default that we consider to be usual and customary for arrangements of this type, including a financial covenant that requires us to maintain a ratio of Consolidated Net Debt to Total Capitalization, each as defined in the MPC Credit Agreement, of no greater than 0.65 to 1.00 as of the last day of each fiscal quarter. The covenants also restrict, among other things, our ability and/or the ability of certain of our subsidiaries to incur debt, create liens on assets or enter into transactions with affiliates. As of December 31, 2022, we were in compliance with the covenants contained in the MPC Credit Agreement. Trade Receivables Securitization Facility On September 30, 2021, we entered into a Loan and Security Agreement and related documentation with a group of lenders providing for a new trade receivables securitization facility having $100 million of committed borrowing and letter of credit issuance capacity and up to an additional $400 million of uncommitted borrowing and letter of credit issuance capacity that can be extended at the discretion of the lenders, provided that at no time may outstanding borrowings and letters of credit issued under the facility exceed the balance of eligible trade receivables (as calculated in accordance with the Loan and Security Agreement) that are pledged as collateral under the facility. In July 2022, the trade receivables securitization facility was amended to, among other things, extend its term until September 29, 2023. The trade receivables facility consists of certain of our wholly owned subsidiaries (“Originators”) selling or contributing on an on-going basis all of the trade receivables generated by them (the “Pool Receivables”), together with all related security and interests in the proceeds thereof, without recourse, to another wholly owned, bankruptcy-remote special purpose subsidiary, MPC Trade Receivables Company I LLC (“TRC”), in exchange for a combination of cash, equity and/or borrowings under a subordinated note issued by TRC. TRC may request borrowings and extensions of credit under the Loan and Security Agreement for up to the lesser of the maximum capacity under the facility or the eligible trade receivables balance of the Pool Receivables. TRC and each of the Originators have granted a security interest in all of their rights, title and interests in and to the Pool Receivables, together with all related security and interests in the proceeds thereof, to the lenders to secure the performance of TRC’s and the Originators’ payment and other obligations under the facility. In addition, MPC has issued a performance guaranty in favor of the lenders guaranteeing the performance by TRC and the Originators of their obligations under the facility. To the extent that TRC retains an ownership interest in the Pool Receivables, such interest will be included in our consolidated financial statements solely as a result of the consolidation of the financial statements of TRC with those of MPC. The receivables sold or contributed to TRC are available first and foremost to satisfy claims of the creditors of TRC and are not available to satisfy the claims of creditors of MPC. TRC has granted a security interest in all of its assets to the lenders to secure its obligations under the Loan and Security Agreement. TRC pays floating-rate interest charges and usage fees on amounts outstanding under the trade receivables facility, if any, unused fees on the portion of unused commitments and certain other fees related to the administration of the facility and letters of credit that are issued and outstanding under the trade receivables facility. The Loan and Security Agreement and other documents comprising the facility contain representations and covenants that we consider usual and customary for arrangements of this type. Trade receivables are subject to customary criteria, limits and reserves before being deemed to be eligible receivables that count towards the borrowing base under the trade receivables facility. In addition, the lender’s commitments to extend loans and credits under the facility are subject to termination, and TRC may be subject to default fees, upon the occurrence of certain events of default that are included in the Loan and Security Agreement and other facility documentation, all of which we consider to be usual and customary for arrangements of this type. As of December 31, 2022, we were in compliance with the covenants contained in the Loan and Security Agreement and other facility documentation. MPLX Bank Revolving Credit Facility On July 7, 2022, MPLX entered into a new five-year revolving credit agreement (the “MPLX Credit Agreement”) to replace its previous $3.5 billion credit facility that was scheduled to expire in July 2024. The MPLX Credit Agreement, among other things, provides for a $2.0 billion unsecured revolving credit facility that matures in July 2027 and letter of credit issuing capacity under the facility of up to $150 million. Letters of credit issuing capacity is included in, not in addition to, the $2.0 billion borrowing capacity. The borrowing capacity under the MPLX Credit Agreement may be increased by up to an additional $1.0 billion, subject to certain conditions, including the consent of the lenders whose commitments would increase. In addition, the maturity date may be extended, for up to two additional one year periods, subject to, among other conditions, the approval of lenders holding the majority of the commitments then outstanding, provided that the commitments of any non-consenting lenders will terminate on the then-effective maturity date. 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. MPLX is charged various fees and expenses in connection with the agreement, including administrative agent fees, commitment fees on the unused portion of the commitments and fees with respect to issued and outstanding letters of credit. The applicable margins to the benchmark interest rates and the commitment fees payable under the MPLX Credit Agreement fluctuate based on changes, if any, to MPLX’s credit ratings. The MPLX Credit Agreement contains certain representations and warranties, affirmative and restrictive covenants and events of default that we consider to be usual and customary for an agreement of this type, including a financial covenant that requires MPLX to maintain a ratio of Consolidated Total Debt as of the end of each fiscal quarter to Consolidated EBITDA, both as defined in the MPLX Credit Agreement, for the prior four fiscal quarters of no greater than 5.0 to 1.0 (or 5.5 to 1.0 for up to two fiscal quarters following certain acquisitions). Consolidated EBITDA is subject to adjustments for certain acquisitions completed and capital projects undertaken during the relevant period. The covenants also restrict, among other things, MPLX’s ability and/or the ability of certain of its subsidiaries to incur debt, create liens on assets and enter into transactions with affiliates. As of December 31, 2022, MPLX was in compliance with the covenants contained in the MPLX Credit Agreement.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue	Revenue The following table presents our revenues from external customers disaggregated by segment and product line: (Millions of dollars) 2022 2021 2020 Refining & Marketing Refined products $ 161,362 $ 107,345 $ 61,648 Crude oil 8,962 7,132 4,023 Services and other 1,763 873 509 Total revenues from external customers 172,087 115,350 66,180 Midstream Refined products 2,219 1,590 641 Services and other (a) 3,147 3,043 2,958 Total revenues from external customers 5,366 4,633 3,599 Sales and other operating revenues $ 177,453 $ 119,983 $ 69,779 (a) Includes sales-type lease revenue. See Note 28. 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 December 31, 2022, we do not have future performance obligations that are material to future periods. Receivables

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information (Millions of dollars) 2022 2021 2020 Net cash provided by operating activities included: Interest paid (net of amounts capitalized) $ 1,060 $ 1,231 $ 1,235 Net income taxes paid to (received from) taxing authorities 4,869 2,436 (179) Cash paid for amounts included in the measurement of lease liabilities Payments on operating leases 498 569 651 Interest payments under finance lease obligations 24 21 25 Net cash provided by financing activities included: Principal payments under finance lease obligations 79 71 66 Non-cash investing and financing activities: Right of use assets obtained in exchange for new operating lease obligations 367 349 343 Right of use assets obtained in exchange for new finance lease obligations 60 37 110 Contribution of assets (a) 818 — — Book value of equity method investment (b) 150 — — (a) Represents the book value of property, plant and equipment, inventory and working capital contributed by MPC to Martinez Renewables LLC. See Note 16 for additional information. (b) Represents the book value of MPC’s equity method investment in Watson Cogeneration Company and Crowley Ocean Partners prior to MPC buying out the remaining interest in these entities. See Note 16 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: (Millions of dollars) 2022 2021 2020 Additions to property, plant and equipment per the consolidated statements of cash flows $ 2,420 $ 1,464 $ 2,787 Increase (decrease) in capital accruals (37) 141 (518) Total capital expenditures $ 2,383 $ 1,605 $ 2,269

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Income (Loss) The following table shows the changes in accumulated other comprehensive income (loss) by component. Amounts in parentheses indicate debits. (Millions of dollars) Pension Benefits Other Benefits Other Total Balance as of December 31, 2020 $ (338) $ (181) $ 7 $ (512) Other comprehensive income (loss) before reclassifications, net of tax of $127 171 220 (5) 386 Amounts reclassified from accumulated other comprehensive loss: Amortization of prior service cost (credit) (a) (45) 2 — (43) Amortization of actuarial loss (a) 37 10 — 47 Settlement loss (a) 75 1 — 76 Other — — (1) (1) Tax effect (17) (3) — (20) Other comprehensive income (loss) 221 230 (6) 445 Balance as of December 31, 2021 $ (117) $ 49 $ 1 $ (67) (Millions of dollars) Pension Benefits Other Benefits Other Total Balance as of December 31, 2021 $ (117) $ 49 $ 1 $ (67) Other comprehensive income (loss) before reclassifications, net of tax of $11 (70) 129 (1) 58 Amounts reclassified from accumulated other comprehensive loss: Amortization of prior service credit (a) (45) (22) — (67) Amortization of actuarial loss (a) 4 6 — 10 Settlement loss (a) 79 — — 79 Tax effect (14) 3 — (11) Other comprehensive income (loss) (46) 116 (1) 69 Balance as of December 31, 2022 $ (163) $ 165 $ — $ 2 (a) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 26.

Pension and Other Postretiremen

Pension and Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Benefit Pension and Other Postretirement Plans	Pension and Other Postretirement Benefits We have noncontributory defined benefit pension plans covering substantially all employees. Benefits under these plans have been based primarily on age, years of service and final average pensionable earnings. The years of service component of these formulae was frozen as of December 31, 2009. Certain of the pensionable earnings components were frozen as of December 31, 2012. Benefits for service beginning January 1, 2010 and beginning on January 1, 2016 are based on a cash balance formula with an annual percentage of eligible pay credited based upon age and years of service or at a flat rate of eligible pay, depending on covered employee group. Substantially all of our employees also accrue benefits under a defined contribution plan. (Millions of dollars) 2022 2021 2020 Cash balance weighted average interest crediting rates 3.00 % 3.00 % 3.00 % We also have other postretirement benefits covering most employees. Retiree health care benefits are provided through comprehensive hospital, surgical, major medical benefit, prescription drug and related health benefit provisions subject to various cost sharing features. Retiree life insurance benefits are provided to a closed group of retirees. Other postretirement benefits are not funded in advance. In connection with the Andeavor acquisition, we assumed a number of additional qualified and nonqualified noncontributory benefit pension plans, covering substantially all former Andeavor employees. Benefits under these plans are determined based on final average compensation and years of service through December 31, 2010 and a cash balance formula for service beginning January 1, 2011. These plans were frozen as of December 31, 2018. Further, as of December 31, 2019, the qualified plans were merged with our existing qualified plans in which the actuarial assumptions were materially the same between the plans. We also assumed a number of additional postretirement benefits covering eligible employees. These benefits were merged with our existing benefits beginning January 1, 2019. Obligations and Funded Status The accumulated benefit obligation for all defined benefit pension plans was $2,272 million and $2,995 million as of December 31, 2022 and 2021. The following summarizes the projected benefit obligations and funded status for our defined benefit pension and other postretirement plans: Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2022 2021 Benefit obligations at January 1 $ 3,295 $ 3,671 $ 828 $ 1,131 Service cost 228 297 26 34 Interest cost 102 93 21 30 Actuarial gain (a) (653) (169) (168) (16) Benefits paid (b) (613) (594) (57) (75) Plan amendments — — — (276) Other — (3) — — Benefit obligations at December 31 2,359 3,295 650 828 Fair value of plan assets at January 1 3,043 2,621 — — Actual return on plan assets (622) 194 — — Employer contributions (c) 30 822 57 75 Benefits paid from plan assets (613) (594) (57) (75) Fair value of plan assets at December 31 1,838 3,043 — — Funded status at December 31 $ (521) $ (252) $ (650) $ (828) (a) The primary driver of the actuarial gain for the pension and other postretirement benefits plans in 2022 was the increase in discount rate compared to 2021. (b) Of the $613 million in benefits paid in 2022, $285 million is related to the pension annuity lift-out. (c) Of the $822 million in pension employer contributions in 2021, $763 million was voluntary contributions. Amounts recognized in the consolidated balance sheet for our pension and other postretirement benefit plans at December 31 include: Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2022 2021 Current liabilities $ (7) $ (11) $ (50) $ (54) Noncurrent liabilities (514) (241) (600) (774) Accrued benefit cost $ (521) $ (252) $ (650) $ (828) Included in accumulated other comprehensive loss at December 31 were the following before-tax amounts that had not been recognized in net periodic benefit cost: Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2022 2021 Net actuarial loss $ 386 $ 360 $ 19 $ 192 Prior service credit (114) (159) (224) (246) Amounts exclude those related to LOOP and Explorer, equity method investees with defined benefit pension and postretirement plans for which net losses (gains) of $11 million and $(1) million were recorded in accumulated other comprehensive income (loss) in 2022, reflecting our ownership share. Components of Net Periodic Benefit Cost and Other Comprehensive (Income) Loss The following summarizes the net periodic benefit costs and the amounts recognized as other comprehensive loss (pretax) for our defined benefit pension and other postretirement plans. Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2020 2022 2021 2020 Service cost $ 230 $ 287 $ 283 $ 26 $ 34 $ 35 Interest cost 102 93 98 21 30 32 Expected return on plan assets (142) (139) (133) — — — Amortization of prior service cost (credit) (45) (45) (45) (22) 2 — Amortization of actuarial loss 4 37 36 6 10 3 Settlement loss 79 75 20 — 1 — Net periodic benefit cost (a) $ 228 $ 308 $ 259 $ 31 $ 77 $ 70 Actuarial (gain) loss $ 109 $ (227) $ 179 $ (167) $ (16) $ 83 Prior service credit — — — — (276) — Amortization of actuarial loss (83) (112) (56) (6) (11) (3) Amortization of prior service (cost) credit 45 45 45 22 (2) — Total recognized in other comprehensive (income) loss $ 71 $ (294) $ 168 $ (151) $ (305) $ 80 Total recognized in net periodic benefit cost and other comprehensive (income) loss $ 299 $ 14 $ 427 $ (120) $ (228) $ 150 (a) Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years. For certain of our pension plans, lump sum payments to employees retiring in 2022, 2021 and 2020 exceeded the plan’s total service and interest costs expected for those years. Settlement losses are required to be recorded when lump sum payments exceed total service and interest costs. As a result, pension settlement expenses were recorded in 2022, 2021 and 2020. Plan Assumptions The following summarizes the assumptions used to determine the benefit obligations at December 31, and net periodic benefit cost for the defined benefit pension and other postretirement plans for 2022, 2021 and 2020. Pension Benefits Other Benefits 2022 2021 2020 2022 2021 2020 Benefit obligation: Discount rate 5.04 % 2.82 % 2.44 % 5.08 % 2.93 % 2.55 % Rate of compensation increase 4.18 % 5.70 % 5.70 % 4.18 % 5.70 % 5.70 % Net periodic benefit cost: Discount rate 3.33 % 2.70 % 3.00 % 2.93 % 2.55 % 3.23 % Expected long-term return on plan assets 5.75 % 5.75 % 5.75 % — % — % — % Rate of compensation increase 4.18 % 5.70 % 5.70 % 4.18 % 5.70 % 5.70 % Expected Long-term Return on Plan Assets The overall expected long-term return on plan assets assumption is determined based on an asset rate-of-return modeling tool developed by a third-party investment group. The tool utilizes underlying assumptions based on actual returns by asset category and inflation and takes into account our asset allocation to derive an expected long-term rate of return on those assets. Capital market assumptions reflect the long-term capital market outlook. The assumptions for equity and fixed income investments are developed using a building-block approach, reflecting observable inflation information and interest rate information available in the fixed income markets. Long-term assumptions for other asset categories are based on historical results, current market characteristics and the professional judgment of our internal and external investment teams. Assumed Health Care Cost Trend The following summarizes the assumed health care cost trend rates. December 31, 2022 2021 2020 Health care cost trend rate assumed for the following year: Medical: Pre-65 6.60 % 5.80 % 6.00 % Prescription drugs 8.90 % 6.40 % 7.00 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate): Medical: Pre-65 4.50 % 4.50 % 4.50 % Prescription drugs 4.50 % 4.50 % 4.50 % Year that the rate reaches the ultimate trend rate: Medical: Pre-65 2031 2030 2028 Prescription drugs 2031 2030 2028 Increases in the post-65 medical plan premium for the Marathon Petroleum Health Plan and the Marathon Petroleum Retiree Health Plan have been permanently eliminated. Plan Investment Policies and Strategies The investment policies for our pension plan assets reflect the funded status of the plans and expectations regarding our future ability to make further contributions. Long-term investment goals are to: (1) manage the assets in accordance with the legal requirements of all applicable laws; (2) diversify plan investments across asset classes to achieve an optimal balance between risk and return and between income and growth of assets through capital appreciation; and (3) source benefit payments primarily through existing plan assets and anticipated future returns. The investment goals are implemented to manage the plans’ funded status volatility and minimize future cash contributions. The asset allocation strategy will change over time in response to changes primarily in funded status, which is dictated by current and anticipated market conditions, the independent actions of our investment committee, required cash flows to and from the plans and other factors deemed appropriate. Such changes in asset allocation are intended to allocate additional assets to the fixed income asset class should the funded status improve. The fixed income asset class shall be invested in such a manner that its interest rate sensitivity correlates highly with that of the plans’ liabilities. Other asset classes are intended to provide additional return with associated higher levels of risk. Investment performance and risk is measured and monitored on an ongoing basis through quarterly investment meetings and periodic asset and liability studies. At December 31, 2022, the primary plan’s targeted asset allocation was 50 percent equity, private equity, real estate, and timber securities and 50 percent fixed income securities. Fair Value Measurements Plan assets are measured at fair value. The following provides a description of the valuation techniques employed for each major plan asset category at December 31, 2022 and 2021. Cash and cash equivalents Cash and cash equivalents include a collective fund serving as the investment vehicle for the cash reserves and cash held by third-party investment managers. The collective fund is valued at net asset value (“NAV”) on a scheduled basis using a cost approach, and is considered a Level 2 asset. Cash and cash equivalents held by third-party investment managers are valued using a cost approach and are considered Level 2. Equity Equity investments includes common stock, mutual and pooled funds. Common stock investments are valued using a market approach, which are priced daily in active markets and are considered Level 1. Mutual and pooled equity funds are well diversified portfolios, representing a mix of strategies in domestic, international and emerging market strategies. Mutual funds are publicly registered, valued at NAV on a daily basis using a market approach and are considered Level 1 assets. Pooled funds are valued at NAV using a market approach and are considered Level 2. Fixed Income Fixed income investments include corporate bonds, U.S. dollar treasury bonds and municipal bonds. These securities are priced on observable inputs using a combination of market, income and cost approaches. These securities are considered Level 2 assets. Fixed income also includes a well diversified bond portfolio structured as a pooled fund. This fund is valued at NAV on a daily basis using a market approach and is considered Level 2. Other investments classified as Level 1 include mutual funds that are publicly registered, valued at NAV on a daily basis using a market approach. Private Equity Private equity investments include interests in limited partnerships which are valued using information provided by external managers for each individual investment held in the fund. These holdings are considered Level 3. Real Estate Real estate investments consist of interests in limited partnerships. These holdings are either appraised or valued using the investment manager’s assessment of assets held. These holdings are considered Level 3. Other Other investments include two limited liability companies (“LLCs”) with no public market. The LLCs were formed to acquire timberland in the northwest U.S. These holdings are either appraised or valued using the investment manager’s assessment of assets held. These holdings are considered Level 3. Other investments classified as Level 1 include publicly traded depository receipts, while Level 2 include derivative transactions. The following tables present the fair values of our defined benefit pension plans’ assets, by level within the fair value hierarchy, as of December 31, 2022 and 2021. December 31, 2022 December 31, 2021 (Millions of dollars) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash and cash equivalents $ — $ 3 $ — $ 3 $ — $ 47 $ — $ 47 Equity: Common stocks 40 — — 40 61 — — 61 Mutual funds 104 — — 104 170 — — 170 Pooled funds — 742 — 742 — 1,192 — 1,192 Fixed income: Corporate — 582 — 582 — 800 — 800 Government 211 41 — 252 415 108 — 523 Pooled funds — 79 — 79 — 192 — 192 Private equity — — 13 13 — — 19 19 Real estate — — 14 14 — — 17 17 Other — 5 4 9 1 3 18 22 Total investments, at fair value $ 355 $ 1,452 $ 31 $ 1,838 $ 647 $ 2,342 $ 54 $ 3,043 The following is a reconciliation of the beginning and ending balances recorded for plan assets classified as Level 3 in the fair value hierarchy: 2022 2021 (Millions of dollars) Private Equity Real Estate Other Private Equity Real Estate Other Beginning balance $ 19 $ 17 $ 18 $ 23 $ 20 $ 19 Actual return on plan assets: Realized 3 2 — 2 1 — Unrealized (4) (2) 7 8 1 — Purchases — 1 — — — — Sales (5) (4) (21) (14) (5) (1) Ending balance $ 13 $ 14 $ 4 $ 19 $ 17 $ 18 Cash Flows Contributions to defined benefit plans Our funding policy with respect to the funded pension plans is to contribute amounts necessary to satisfy minimum pension funding requirements, including requirements of the Pension Protection Act of 2006, plus such additional, discretionary, amounts from time to time as determined appropriate by management. In 2022, we made contributions totaling $15 million to our funded pension plans. For 2023, we do not project any required funding, but we may make voluntary contributions to our funded pension plans at our discretion. Cash contributions to be paid from our general assets for the unfunded pension and postretirement plans are estimated to be approximately $7 million and $50 million, respectively, in 2023. Estimated future benefit payments The following gross benefit payments, which reflect expected future service, as appropriate, are expected to be paid in the years indicated. (Millions of dollars) Pension Benefits Other Benefits 2023 $ 148 $ 50 2024 155 50 2025 165 50 2026 173 50 2027 175 50 2028 through 2032 1,010 258 Contributions to defined contribution plan We also contribute to a defined contribution plan for eligible employees. Contributions to this plan totaled $167 million, $165 million and $180 million in 2022, 2021 and 2020, respectively. Multiemployer Pension Plan We contribute to one multiemployer defined benefit pension plan under the terms of a collective-bargaining agreement that covers some of our union-represented employees. The risks of participating in this multiemployer plan are different from single-employer plans in the following aspects: • Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers. • If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. • If we choose to stop participating in the multiemployer plan, we may be required to pay that plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability. Our participation in this plan for 2022, 2021 and 2020 is outlined in the table below. The “EIN” column provides the Employee Identification Number for the plan. The most recent Pension Protection Act zone status available in 2022 and 2021 is for the plan’s year ended December 31, 2021 and December 31, 2020, respectively. The zone status is based on information that we received from the plan and is certified by the plan’s actuary. Among other factors, plans in the red zone are generally less than 65 percent funded. The “FIP/RP Status Pending/Implemented” column indicates a financial improvement plan or a rehabilitation plan has been implemented. The last column lists the expiration date of the collective-bargaining agreement to which the plan is subject. There have been no significant changes that affect the comparability of 2022, 2021 and 2020 contributions. Our portion of the contributions does not make up more than five percent of total contributions to the plan. Pension FIP/RP Status MPC Contributions Millions of dollars ) Surcharge Expiration Date of Pension Fund EIN 2022 2021 2022 2021 2020 Central States, Southeast and Southwest Areas Pension Plan (a) 366044243 Red Red Implemented $ 5 $ 5 $ 5 No January 31, 2024 (a) This agreement has a minimum contribution requirement of $338 per week per employee for 2023. A total of 258 employees participated in the plan as of December 31, 2022. Multiemployer Health and Welfare Plan We contribute to one multiemployer health and welfare plan that covers both active employees and retirees. Through the health and welfare plan, employees receive medical, dental, vision, prescription and disability coverage. Our contributions to this plan totaled $7 million, $7 million and $7 million for 2022, 2021 and 2020, respectively.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Share-Based Compensation Description of the Incentive Plans Our employees and non-employee directors are eligible to receive share, share-based and other types of awards under the Marathon Petroleum Corporation 2021 Incentive Compensation Plan (“MPC 2021 Plan”). The MPC 2021 Plan authorizes the Compensation and Organization Development Committee of our board of directors (“Committee”) to grant nonqualified or incentive stock options, stock appreciation rights, share and share-based awards (including restricted stock and restricted stock unit awards), cash awards and performance awards to our employees and non-employee directors. The maximum number of shares of our common stock available for awards under the MPC 2021 Plan is 20.5 million shares. The MPC 2021 Plan became effective upon shareholder approval on April 28, 2021. Prior to that date, our employees and non-employee directors were eligible to receive share, share-based and other types of awards under the Amended and Restated Marathon Petroleum Corporation 2012 Incentive Compensation Plan (“MPC 2012 Plan”), effective April 26, 2012, and prior to that date, the Marathon Petroleum Corporation 2011 Second Amended and Restated Incentive Compensation Plan (“MPC 2011 Plan”). Shares issued as a result of awards granted under these plans are funded through the issuance of new MPC common shares. Share-Based Awards under the Plans We expense all share-based payments to employees and non-employee directors based on the grant date fair value of the awards over the requisite service period, adjusted for estimated forfeitures. Stock Options Prior to 2021, we granted stock options to certain officer and non-officer employees under the MPC 2011 Plan and the MPC 2012 Plan. Stock options represent the right to purchase shares of our common stock at an exercise price equal to the closing price of our common stock on the date of grant. Stock options generally vest over a service period of three years and expire ten years after the grant date. We used the Black Scholes option-pricing model to estimate the fair value of stock options granted, which requires the input of subjective assumptions. Restricted Stock and Restricted Stock Units We grant restricted stock units to certain employees and to our non-employee directors. Prior to 2021, we granted restricted stock to certain employees and to our non-employee directors. In general, restricted stock and restricted stock units granted to employees vest over a requisite service period of three years. Restricted stock awards and restricted stock unit awards granted to officers prior to 2022 are subject to an additional one year holding period after the three-year vesting period. Restricted stock recipients have the right to vote such stock; however, dividends are accrued and when vested are payable at the dates specified in the awards. The non-vested shares are not transferable and are held by our transfer agent. Restricted stock units granted to non-employee directors are considered to vest immediately at the time of the grant for accounting purposes, as they are non-forfeitable, but are not issued until the director’s departure from the board of directors. Restricted stock unit recipients do not have the right to vote any shares of stock and accrue dividend equivalents which when vested are payable at the dates specified in the awards. The fair values of restricted stock and restricted stock units are equal to the market price of our common stock on the grant date. Performance Units and Performance Share Units We grant performance share unit awards to certain officer employees. At grant, a performance share unit has a target value equal to the MPC common stock average 30-day closing price prior to the grant date. The actual payout value of a performance share unit is based on company performance (which can range from 0% to 200%) during the three calendar year period beginning in the year of grant, multiplied by MPC’s closing share price on the date the Committee certifies performance. Performance share units have a vesting service period beginning on the grant date and ending on the last day of the three-year performance period. Company performance for purposes of payout will be determined by the relative ranking of the total shareholder return (“TSR”) of MPC common stock over the three-year performance period compared to the TSR of a select group of peer companies and the Standard & Poor’s 500 Index and the Alerian MLP Index over the performance period, as well as the median of MPC’s compensation reference group. These awards settle 100 percent in cash and are accounted for as liability awards and recorded at fair value with a mark-to-market adjustment made each quarter. We also grant performance share unit awards to certain non-officer employees. These performance share unit awards operate as explained above for awards made to certain officer employees, but the awards vest in one-third increments on December 31 of the first, second and third calendar years of the three calendar year performance period. No performance share unit awards were granted prior to 2021. Prior to 2021, we granted performance unit awards to certain officer employees under the MPC 2012 Plan. Performance units are dollar-denominated. The target value of all performance units is $1.00, with actual payout up to $2.00 per unit (up to 200 percent of target). Performance unit awards have a 36-month requisite service period. The payout value of these awards is determined by the relative ranking of the TSR of MPC common stock compared to the TSR of a select group of peer companies, as well as the Standard & Poor’s 500 Energy Index fund over an average of four measurement periods. These awards are settled 25 percent in MPC common stock and 75 percent in cash. The number of shares actually distributed is determined as 25 percent of the final payout divided by the closing price of MPC common stock on the day the Committee certifies the final TSR rankings, or the next trading day if the certification is made outside of normal trading hours. The performance units paying out in cash are accounted for as liability awards and recorded at fair value with a mark-to-market adjustment made each quarter. The performance units that settle in shares are accounted for as share awards and do not receive dividend equivalents. Total Share-Based Compensation Expense The following table reflects activity related to our share-based compensation arrangements, including the converted awards related to the acquisition of Andeavor: (Millions of dollars) 2022 2021 2020 Share-based compensation expense $ 153 $ 88 $ 100 Tax benefit recognized on share-based compensation expense 37 22 25 Cash received by MPC upon exercise of stock option awards 243 106 11 Tax benefit received for tax deductions for stock awards exercised 53 13 16 Stock Option Awards The following is a summary of our common stock option activity in 2022: Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Terms (in years) Aggregate Intrinsic Value (Millions of dollars) Outstanding at December 31, 2021 7,795,036 $ 46.23 Exercised (5,267,328) 46.16 Forfeited or expired (38,474) 20.87 Outstanding at December 31, 2022 2,489,234 46.78 Vested and expected to vest at December 31, 2022 2,488,962 46.78 4.1 $ 173 Exercisable at December 31, 2022 2,000,853 51.77 3.3 129 The intrinsic value of options exercised by MPC employees during 2022, 2021 and 2020 was $247 million, $88 million and $25 million, respectively. As of December 31, 2022, unrecognized compensation cost related to stock option awards was $1 million, which is expected to be recognized over a weighted average period of 0.2 years. Restricted Stock and Restricted Stock Unit Awards The following is a summary of restricted stock and restricted stock unit award activity of our common stock in 2022: Restricted Stock Restricted Stock Units Number of Weighted Number of Weighted Unvested at December 31, 2021 194,629 $ 60.95 2,313,919 $ 35.84 Granted — — 653,378 75.81 Vested (191,833) 60.98 (1,026,720) 34.24 Forfeited (2,105) 60.92 (154,427) 47.64 Unvested at December 31, 2022 691 54.60 1,786,150 50.36 The following is a summary of the values related to restricted stock and restricted stock unit awards held by MPC employees and non-employee directors: Restricted Stock Restricted Stock Units Intrinsic Value of Awards Vested During the Period (Millions of dollars) Weighted Average Grant Date Fair Value of Awards Granted During the Period Intrinsic Value of Awards Vested During the Period (Millions of dollars) Weighted Average Grant Date Fair Value of Awards Granted During the Period 2022 $ 17 $ — $ 99 $ 75.81 2021 20 — 90 55.27 2020 18 56.49 59 22.82 As of December 31, 2022, unrecognized compensation cost related to restricted stock awards was less than $1 million, which is expected to be recognized over a weighted average period of 0.1 years. Unrecognized compensation cost related to restricted stock unit awards was $54 million, which is expected to be recognized over a weighted average period of 1.18 years. Performance Unit Awards The following table presents a summary of the 2022 activity for performance unit awards to be settled in shares: Number of Units Weighted Average Grant Date Fair Value Unvested at December 31, 2021 6,255,283 $ 0.78 Vested (6,221,223) 0.77 Forfeited (34,060) 0.89 Unvested at December 31, 2022 — — The number of shares that would be issued upon target vesting, using the closing price of our common stock on December 31, 2022 would be 26,685 shares. Performance units to be settled in MPC shares have a grant date fair value calculated using a Monte Carlo valuation model, which requires the input of subjective assumptions. The following table provides a summary of these assumptions: 2020 Risk-free interest rate 0.9 % Look-back period (in years) 2.8 Expected volatility 30.4 % Grant date fair value of performance units granted $ 0.89 The risk-free interest rate for the remaining performance period as of the grant date is based on the U.S. Treasury yield curve in effect at the time of the grant. The look-back period reflects the remaining performance period at the grant date. The assumption for the expected volatility of our stock price reflects the average MPC common stock historical volatility. MPLX Awards Compensation expense for awards of MPLX units are not material to our consolidated financial statements for 2022.

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Lessee, Operating Leases	Lessee We lease a wide variety of facilities and equipment including land and building space, office and field equipment, storage facilities and transportation equipment. Our remaining lease terms range from less than one year to 96 years. Most long-term leases include renewal options ranging from less than one year to 49 years and, in certain leases, also include purchase options. The lease term included in the measurement of right of use assets and lease liabilities includes options to extend or terminate our leases that we are reasonably certain to exercise. Under ASC 842, the components of lease cost are shown below. Lease costs for operating leases are recognized on a straight line basis and are reflected in the income statement based on the leased asset’s use. Lease costs for finance leases are reflected in depreciation and amortization and in net interest and other financial costs. (Millions of dollars) 2022 2021 2020 Finance lease cost: Amortization of right of use assets $ 81 $ 78 $ 72 Interest on lease liabilities 29 31 35 Operating lease cost 490 565 658 Variable lease cost 59 62 60 Short-term lease cost 772 446 649 Total lease cost $ 1,431 $ 1,182 $ 1,474 Supplemental consolidated balance sheet data related to leases were as follows: December 31, (Millions of dollars) 2022 2021 Operating leases Assets Right of use assets $ 1,214 $ 1,372 Liabilities Operating lease liabilities $ 368 $ 438 Long-term operating lease liabilities 841 927 Total operating lease liabilities $ 1,209 $ 1,365 Weighted average remaining lease term (in years) 5.1 5.0 Weighted average discount rate 3.55 % 3.11 % Finance leases Assets Property, plant and equipment, gross $ 818 $ 815 Less accumulated depreciation 412 336 Property, plant and equipment, net $ 406 $ 479 Liabilities Debt due within one year $ 79 $ 73 Long-term debt 451 525 Total finance lease liabilities $ 530 $ 598 Weighted average remaining lease term (in years) 9.9 10.3 Weighted average discount rate 5.09 % 5.04 % As of December 31, 2022, maturities of lease liabilities for operating lease obligations and finance lease obligations having initial or remaining non-cancellable lease terms in excess of one year are as follows: (Millions of dollars) Operating Finance 2023 $ 403 $ 104 2024 308 87 2025 228 78 2026 140 75 2027 72 59 2028 and thereafter 172 268 Gross lease payments 1,323 671 Less: imputed interest 114 141 Total lease liabilities $ 1,209 $ 530
Lessor, Operating Leases	Lessor MPLX is considered to be the lessor under several operating lease agreements in accordance with GAAP related to certain fee-based natural gas transportation and processing agreements in the Marcellus and Southern Appalachia region. The primary term of these agreements expire between 2026 and 2036, however, these contracts either have renewal options or will continue thereafter on a year-to-year basis until terminated by either party. MPLX did not elect to use the practical expedient to combine lease and non-lease components for lessor arrangements. The tables below represent the portion of the contract allocated to the lease component based on relative standalone selling price. MPLX elected the practical expedient to carry forward historical classification conclusions until a modification of an existing agreement occurs. Once a modification occurs, the amended agreement is required to be assessed under ASC 842 to determine whether a reclassification of the lease is required. During the third quarter of 2022, the approved expansion of a gathering and compression system triggered the first assessment of a third party agreement under ASC 842. As a result of the assessment during the period, the lease was reclassified from an operating lease to a sales-type lease. Accordingly, the underlying property, plant and equipment of $745 million and associated deferred revenue of $277 million were derecognized. The present value of the future lease payments of $914 million and the unguaranteed residual value of $63 million were recorded as the net investment in the lease within receivables and other noncurrent assets. This resulted in a gain of approximately $509 million, which was recorded as a net gain on disposal of assets in the consolidated statements of income. This transaction was a non-cash transaction. Lease revenues are included in sales and other operating revenues on the consolidated statements of income. Lease revenues were as follows: (Millions of dollars) 2022 2021 2020 Operating leases: Rental income $ 327 $ 376 $ 398 Sales-type leases: Interest income (Sales-type rental revenue-fixed minimum) 46 — — Interest income (Revenue from variable lease payments) 16 — — Sales-type lease revenue $ 62 $ — $ — The following is a schedule of minimum future rentals on the non-cancelable operating leases as of December 31, 2022: (Millions of dollars) 2023 $ 97 2024 95 2025 64 2026 37 2027 16 2028 and thereafter 21 Total minimum future rentals $ 330 Annual minimum undiscounted lease payment receipts under our sales-type leases were as follows as of December 31, 2022: (Millions of dollars) 2023 $ 169 2024 156 2025 146 2026 137 2027 128 2028 and thereafter 970 Total minimum future rentals 1,706 Less: present value discount 765 Lease receivables (a) $ 941 Current lease receivables (b) $ 98 Long-term lease receivables (c) 843 Unguaranteed residual assets 66 Total sales-type lease assets $ 1,007 (a) This amount does not include the unguaranteed residual assets. (b) Presented in receivables, net on the consolidated balance sheets. (c) Presented in other noncurrent assets on the consolidated balance sheets. Capital expenditures related to assets subject to sales-type lease arrangements were $27 million for the year ended December 31, 2022. These amounts are reflected as additions to property, plant and equipment in the consolidated statements of cash flows. The following schedule summarizes our investment in assets held under operating lease by major classes as of December 31, 2022 and 2021: December 31, (Millions of dollars) 2022 2021 Gathering and transportation $ 94 $ 991 Processing and fractionation 973 867 Terminals 128 128 Land, building and other 10 15 Property, plant and equipment 1,205 2,001 Less accumulated depreciation 330 523 Total property, plant and equipment, net $ 875 $ 1,478

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 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 December 31, 2022 and 2021, accrued liabilities for remediation totaled $ 387 million 401 million 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 remain 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. Asset Retirement Obligations Our short-term asset retirement obligations were $27 million and $14 million at December 31, 2022 and 2021, respectively, and are included in other current liabilities in our consolidated balance sheets. Our long-term asset retirement obligations were $186 million and $187 million at December 31, 2022 and 2021, respectively, which are included in deferred credits and other liabilities in our consolidated balance sheets. 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. After subsequent appeal proceedings and in compliance with a new order issued by the BIA, in December 2020, THPP paid approximately $4 million in assessed trespass damages and ceased use of the portion of the pipeline that crosses the property at issue. In March 2021, the BIA issued an order purporting to vacate the BIA's prior orders related to THPP’s alleged trespass and direct the Regional Director of the BIA to reconsider the issue of THPP’s alleged trespass and issue a new order. In April 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 2021 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 and counterclaims to THPP’s suit claiming 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 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 tend 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 December 31, 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. The Army Corps expects to release a draft EIS in 2023. 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 December 31, 2022, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement were approximately $170 million. Crowley Blue Water Partners In connection with our 50 percent indirect interest in Crowley Blue Water Partners, 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 December 31, 2022, our maximum potential undiscounted payments under this arrangement was $101 million. Marathon Oil indemnifications The separation and distribution agreement and other agreements with Marathon Oil to effect our spinoff provide for cross-indemnities between Marathon Oil and us. In general, Marathon Oil is required to indemnify us for any liabilities relating to Marathon Oil’s historical oil and gas exploration and production operations, oil sands mining operations and integrated gas operations, and we are required to indemnify Marathon Oil for any liabilities relating to Marathon Oil’s historical refining, marketing and transportation operations. The terms of these indemnifications are indefinite and the amounts are not capped. Other guarantees We have entered into other guarantees with maximum potential undiscounted payments totaling $160 million as of December 31, 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, a commitment to pay a termination fee on a supply agreement if terminated during the initial term, and leases of assets containing general lease indemnities and guaranteed residual values. General guarantees associated with dispositions Over the years, we have sold various assets in the normal course of our business. Certain of the related agreements contain performance and general guarantees, including guarantees regarding inaccuracies in representations, warranties, covenants and agreements, and environmental and general indemnifications that require us to perform upon the occurrence of a triggering event or condition. These guarantees and indemnifications are part of the normal course of selling assets. We are typically not able to calculate the maximum potential amount of future payments that could be made under such contractual provisions because of the variability inherent in the guarantees and indemnities. Most often, the nature of the guarantees and indemnities is such that there is no appropriate method for quantifying the exposure because the underlying triggering event has little or no past experience upon which a reasonable prediction of the outcome can be based. Contractual Commitments and Contingencies At December 31, 2022, our contractual commitments to acquire property, plant and equipment totaled $289 million. Our contractual commitments to acquire property, plant and equipment totaled $565 million at December 31, 2021, primarily consisting of refining projects which includes the conversion of the Martinez refinery to a renewable diesel facility. Certain natural gas processing and gathering arrangements require us to construct natural gas processing plants, natural gas gathering pipelines and NGL pipelines and contain certain fees and charges if specified construction milestones are not achieved for reasons other than force majeure. In certain cases, certain producer customers may have the right to cancel the processing arrangements if there are significant delays that are not due to force majeure.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Incremental $5 Billion Share Repurchase Authorization On January 31, 2023, we announced that 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. MPLX Senior Notes On February 9, 2023, MPLX issued $1.6 billion aggregate principal amount of senior notes in a public offering, consisting of $1.1 billion aggregate principal amount of 5.00% senior notes due March 2033 and $500 million principal amount of 5.65% senior notes due March 2053.

Summary of Principal Accounti_2

Summary of Principal Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Principles applied in consolidation	Principles Applied in Consolidation These consolidated financial statements include the accounts of our majority-owned, controlled subsidiaries and MPLX. As of December 31, 2022, we owned the general partner and approximately 65 percent of the outstanding MPLX common units. Due to our ownership of the general partner interest, we have determined that we control MPLX and therefore we consolidate MPLX and record a noncontrolling interest for the interest owned by the public. Changes in ownership interest in consolidated subsidiaries that do not result in a change in control are recorded as equity transactions. Investments in entities over which we have significant influence, but not control, are accounted for using the equity method of accounting. This includes entities in which we hold majority ownership but the minority shareholders have substantive participating rights. Income from equity method investments represents our proportionate share of net income generated by the equity method investees. Differences in the basis of the investments and the separate net asset values of the investees, if any, are amortized into net income over the remaining useful lives of the underlying assets and liabilities, except for any excess related to goodwill. Equity method investments are evaluated for impairment whenever changes in the facts and circumstances indicate an other than temporary loss in value has occurred. When the loss is deemed to be other than temporary, the carrying value of the equity method investment is written down to fair value.
Use of estimates	Use of Estimates The preparation of financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the respective reporting periods. Actual results could differ from those estimates.
Revenue recognition	Revenue Recognition We recognize revenue based on consideration specified in contracts or agreements with customers when we satisfy our performance obligations by transferring control over products or services to a customer. We made an accounting policy election that all taxes assessed by a governmental authority that are both imposed on and concurrent with a revenue-producing transaction and collected from our customers will be recognized on a net basis within sales and other operating revenues. Our revenue recognition patterns are described below by reportable segment: • Refining & Marketing - The vast majority of our Refining & Marketing contracts contain pricing that is based on the market price for the product at the time of delivery. Our obligations to deliver product volumes are typically satisfied and revenue is recognized when control of the product transfers to our customers. Concurrent with the transfer of control, we typically receive the right to payment for the delivered product, the customer accepts the product and the customer has significant risks and rewards of ownership of the product. Payment terms require customers to pay shortly after delivery and do not contain significant financing components. • Midstream - Midstream revenue transactions typically are defined by contracts under which we sell a product or provide a service. Revenues from sales of product are recognized when control of the product transfers to the customer. Revenues from services are recognized over time when the performance obligation is satisfied as services are provided in a series. We have elected to use the output measure of progress to recognize revenue based on the units delivered, processed or transported. The transaction prices in our Midstream contracts often have both fixed components, related to minimum volume commitments, and variable components, which are primarily dependent on volumes. Variable consideration will generally not be estimated at contract inception as the transaction price is specifically allocable to the services provided at each period end. Refer to Note 23 for disclosure of our revenue disaggregated by segment and product line and to Note 12 for a description of our reportable segment operations.
Crude oil and refined product exchanges and matching buy/sell transactions	Crude Oil and Refined Product Exchanges and Matching Buy/Sell Transactions We enter into exchange contracts and matching buy/sell arrangements whereby we agree to deliver a particular quantity and quality of crude oil or refined products at a specified location and date to a particular counterparty and to receive from the same counterparty the same commodity at a specified location on the same or another specified date. The exchange receipts and deliveries are nonmonetary transactions, with the exception of associated grade or location differentials that are settled in cash. The matching buy/sell purchase and sale transactions are settled in cash. No revenues are recorded for exchange and matching buy/sell transactions as they are accounted for as exchanges of inventory. The exchange transactions are recognized at the carrying amount of the inventory transferred.
Cash and cash equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash on hand and on deposit and investments in highly liquid debt instruments with maturities of three months or less.
Short-term investments	Short-Term Investments Investments with a maturity date greater than three months that we intend to convert to cash or cash equivalents within a year or less are classified as short-term investments in our consolidated balance sheets. Additionally, in accordance with ASC 320, Investments - Debt Securities , we have classified all short-term investments as available-for-sale securities and changes in fair market value are reported in other comprehensive income.
Accounts receivable and allowance for doubtful accounts	Accounts Receivable and Allowance for Doubtful Accounts Our receivables primarily consist of customer accounts receivable. Customer receivables are recorded at the invoiced amounts and generally do not bear interest. Allowances for doubtful accounts are generally recorded when it becomes probable the receivable will not be collected and are booked to bad debt expense. The allowance for doubtful accounts is the best estimate of the amount of probable credit losses in customer accounts receivable. We review the allowance quarterly and past-due balances over 150 days are reviewed individually for collectability. We mitigate credit risk with master netting agreements with companies engaged in the crude oil or refinery feedstock trading and supply business or the petroleum refining industry. A master netting agreement generally provides for a once per month net cash settlement of the accounts receivable from and the accounts payable to a particular counterparty.
Lessee, Leases	Leases Contracts with a term greater than one year that convey the right to direct the use of and obtain substantially all of the economic benefit of an asset are accounted for as right of use assets. Right of use asset and lease liability balances are recorded at the commencement date at present value of the fixed lease payments using a secured incremental borrowing rate with a maturity similar to the lease term because our leases do not provide implicit rates. We have elected to include both lease and non-lease components in the present value of the lease payments for all lessee asset classes with the exception of our marine and third-party contractor service equipment leases. The lease component of the payment for the marine and equipment asset classes is determined using a relative standalone selling price. See Note 28 for additional disclosures about our lease contracts.
Lessor, Leases	As a lessor under ASU No. 2016-02, Leases (“ASC 842”), MPLX may be required to re-classify existing operating leases to sales-type leases upon modification and related reassessment of the leases. See Note 28 for further information regarding our ongoing evaluation of the impacts of lease reassessments as modifications occur. The net investment in sales-type leases is recorded within receivables, net and other noncurrent assets on the consolidated balance sheets. These amounts are comprised of the present value of the sum of the future minimum lease payments representing the value of the lease receivable and the unguaranteed residual value of the lease assets. Management assesses the net investment in sales-type leases for recoverability quarterly.
Inventories	Inventories Inventories are carried at the lower of cost or market value. Cost of inventories is determined primarily under the LIFO method. Costs for crude oil and refined product inventories are aggregated on a consolidated basis for purposes of assessing if the LIFO cost basis of these inventories may have to be written down to market value.
Fair Value	Fair Value We account for certain assets and liabilities at fair value. The hierarchy below lists three levels of fair value based on the extent to which inputs used in measuring fair value are observable in the market. We categorize each of our fair value measurements in one of these three levels based on the lowest level input that is significant to the fair value measurement in its entirety. These levels are: • Level 1 – inputs are based upon unadjusted quoted prices for identical instruments in active markets. Our Level 1 derivative assets and liabilities include exchange-traded contracts for crude oil and refined products measured at fair value with a market approach using the close-of-day settlement prices for the market. Commodity derivatives are covered under master netting agreements with an unconditional right to offset. Collateral deposits in futures commission merchant accounts covered by master netting agreements related to Level 1 commodity derivatives are classified as Level 1. • Level 2 – inputs are based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Where applicable, these models project future cash flows and discount the future amounts to a present value using market-based observable inputs including interest rate curves, credit spreads, and forward and spot prices for currencies. Our Level 2 investments include commercial paper, certificates of deposit, time deposits and corporate notes and bonds. Our Level 2 derivative assets and liabilities primarily include certain OTC contracts. • Level 3 – inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques, including option pricing models and discounted cash flow models. Our Level 3 assets and liabilities include goodwill, long-lived assets and intangible assets, when they are recorded at fair value due to an impairment charge and an embedded derivative liability relates to a natural gas purchase agreement embedded in a keep‑whole processing agreement. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities.
Derivative instruments	Derivative Instruments We use derivatives to economically hedge a portion of our exposure to commodity price risk and, historically, to interest rate risk. Our use of selective derivative instruments that assume market risk is limited. All derivative instruments (including derivative instruments embedded in other contracts) are recorded at fair value. Certain commodity derivatives are reflected on the consolidated balance sheets on a net basis by counterparty as they are governed by master netting agreements. Cash flows related to derivatives used to hedge commodity price risk and interest rate risk are classified in operating activities with the underlying transactions. Derivatives not designated as accounting hedges 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. Changes in the fair value of derivatives not designated as accounting hedges are recognized immediately in net income. Concentrations of credit risk All of our financial instruments, including derivatives, involve elements of credit and market risk. The most significant portion of our credit risk relates to nonperformance by counterparties. The counterparties to our financial instruments consist primarily of major financial institutions and companies within the energy industry. To manage counterparty risk associated with financial instruments, we select and monitor counterparties based on an assessment of their financial strength and on credit ratings, if available. Additionally, we limit the level of exposure with any single counterparty.
Concentration of credit risk	Concentrations of credit risk All of our financial instruments, including derivatives, involve elements of credit and market risk. The most significant portion of our credit risk relates to nonperformance by counterparties. The counterparties to our financial instruments consist primarily of major financial institutions and companies within the energy industry. To manage counterparty risk associated with financial instruments, we select and monitor counterparties based on an assessment of their financial strength and on credit ratings, if available. Additionally, we limit the level of exposure with any single counterparty.
Property, plant and equipment	Property, Plant and Equipment Property, plant and equipment are recorded at cost and depreciated on a straight-line basis over the estimated useful lives of the assets, generally 10 to 40 years for refining and midstream assets, 25 years for office buildings and 4 to 7 years for other miscellaneous fixed assets. Such assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable. If the sum of the expected undiscounted future cash flows from the use of the asset group and its eventual disposition is less than the carrying amount of the asset group, an impairment assessment is performed and the excess of the book value over the fair value of the asset group is recorded as an impairment loss. When items of property, plant and equipment are sold or otherwise disposed of, any gains or losses are reported in net income. Gains on the disposal of property, plant and equipment are recognized when earned, which is generally at the time of closing. If a loss on disposal is expected, such losses are recognized when the assets are classified as held for sale. Interest expense is capitalized for qualifying assets under construction. Capitalized interest costs are included in property, plant and equipment and are depreciated over the useful life of the related asset.
Goodwill and intangible assets	Goodwill and Intangible Assets Goodwill represents the excess of the purchase price over the estimated fair value of the net assets acquired in the acquisition of a business. Goodwill is not amortized, but rather is tested for impairment at the reporting unit level annually and when events or changes in circumstances indicate that the fair value of a reporting unit with goodwill has been reduced below carrying value. If we determine, based on a qualitative assessment, that it is not more likely than not that a reporting unit’s fair value is less than its carrying amount, no further impairment testing is required. If we do not perform a qualitative assessment or if that assessment indicates that further impairment testing is required, the fair value of each reporting unit is determined using an income and/or market approach which is compared to the carrying value of the reporting unit. If the carrying amount of the reporting unit exceeds its fair value, an impairment loss would be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. The fair value under the income approach is calculated using the expected present value of future cash flows method. Significant assumptions used in the cash flow forecasts include future volumes, discount rates, and future capital requirements. Amortization of intangibles with definite lives is calculated using the straight-line method, which is reflective of the benefit pattern in which the estimated economic benefit is expected to be received over the estimated useful life of the intangible asset. Intangibles subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the intangible may not be recoverable. If the sum of the expected undiscounted future cash flows related to the asset is less than the carrying amount of the asset, an impairment loss is recognized based on the fair value of the asset. Intangibles not subject to amortization are tested for impairment annually and when circumstances indicate that the fair value is less than the carrying amount of the intangible. If the fair value is less than the carrying value, an impairment is recorded for the difference.
Major maintenance activities	Major Maintenance Activities Costs for planned turnaround and other major maintenance activities are expensed in the period incurred. These types of costs include contractor repair services, materials and supplies, equipment rentals and our labor costs.
Environmental costs	Environmental Costs Environmental expenditures for additional equipment that mitigates or prevents future contamination or improves environmental safety or efficiency of the existing assets are capitalized. We recognize remediation costs and penalties when the responsibility to remediate is probable and the amount of associated costs can be reasonably estimated. The timing of remediation accruals coincides with completion of a feasibility study or the commitment to a formal plan of action. Remediation liabilities are accrued based on estimates of known environmental exposure and are discounted when the estimated amounts are reasonably fixed and determinable. If recoveries of remediation costs from third parties are probable, a receivable is recorded and is discounted when the estimated amount is reasonably fixed and determinable.
Asset retirement obligations	Asset Retirement Obligations The fair value of asset retirement obligations is recognized in the period in which the obligations are incurred if a reasonable estimate of fair value can be made. The majority of our recognized asset retirement liability relates to conditional asset retirement obligations for removal and disposal of fire-retardant material from certain refining facilities. The remaining recognized asset retirement liability relates to other refining assets, certain pipelines and processing facilities and other related pipeline assets. The fair values recorded for such obligations are based on the most probable current cost projections. Asset retirement obligations have not been recognized for some assets because the fair value cannot be reasonably estimated since the settlement dates of the obligations are indeterminate. Such obligations will be recognized in the period when sufficient information becomes available to estimate a range of potential settlement dates. The asset retirement obligations principally include the hazardous material disposal and removal or dismantlement requirements associated with the closure of certain refining, terminal, pipeline and processing assets.
Income taxes	Income Taxes Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their tax bases. Deferred tax assets are recorded when it is more likely than not that they will be realized. The realization of deferred tax assets is assessed periodically based on several factors, primarily our expectation to generate sufficient future taxable income.
Share-based compensation arrangements	Share-Based Compensation Arrangements The fair value of stock options granted to our employees is estimated on the date of grant using the Black-Scholes option pricing model. The model employs various assumptions based on management’s estimates at the time of grant, which impact the calculation of fair value and ultimately, the amount of expense that is recognized over the vesting period of the stock option award. Of the required assumptions, the expected life of the stock option award and the expected volatility of our stock price have the most significant impact on the fair value calculation. The average expected life is based on our historical employee exercise behavior. The assumption for expected volatility of our stock price reflects a weighting of 50 percent of our common stock implied volatility and 50 percent of our common stock historical volatility. The fair value of restricted stock awards granted to our employees is determined based on the fair market value of our common stock on the date of grant. The fair value of performance unit awards granted to our employees is estimated on the date of grant using a Monte Carlo valuation model.
Business combinations	Business Combinations We recognize and measure the assets acquired and liabilities assumed in a business combination based on their estimated fair values at the acquisition date. Any excess or deficiency of the purchase consideration when compared to the fair value of the net tangible assets acquired, if any, is recorded as goodwill or gain from a bargain purchase. For material acquisitions, management engages an independent valuation specialist to assist with the determination of fair value of the assets acquired, liabilities assumed, noncontrolling interest, if any, and goodwill, based on recognized business valuation methodologies. An income, market or cost valuation method may be utilized to estimate the fair value of the assets acquired, liabilities assumed, and noncontrolling interest, if any, in a business combination. The income valuation method represents the present value of future cash flows over the life of the asset using: (i) discrete financial forecasts, which rely on management’s estimates of revenue and operating expenses; (ii) long-term growth rates; and (iii) appropriate discount rates. The market valuation method uses prices paid for a reasonably similar asset by other purchasers in the market, with adjustments relating to any differences between the assets. The cost valuation method is based on the replacement cost of a comparable asset at prices at the time of the acquisition reduced for depreciation of the asset. If the initial accounting for the business combination is incomplete by the end of the reporting period in which the acquisition occurs, an estimate will be recorded. Subsequent to the acquisition date, and not later than one year from the acquisition date, we will record any material adjustments to the initial estimate based on new information obtained that would have existed as of the date of the acquisition. Any adjustment that arises from information obtained that did not exist as of the date of the acquisition will be recorded in the period of the adjustment. Acquisition-related costs are expensed as incurred in connection with each business combination.
Environmental credits and obligations	Environmental Credits and Obligations In order to comply with certain regulations, specifically the RFS2 requirements implemented by the EPA and the cap-and-trade emission reduction program and low carbon fuel standard implemented by state programs, we are required to reduce our emissions, blend certain levels of biofuels or obtain allowances or credits to offset the obligations created by our operations. In regard to each program, we record an asset, included in other current assets or other noncurrent assets on the consolidated balance sheets, for allowances or credits owned in excess of our anticipated current period compliance requirements. The asset value is based on the product of the excess allowances or credits as of the balance sheet date, if any, and the weighted average cost of those allowances or credits. We record a liability, included in other current liabilities or deferred credits and other liabilities on the consolidated balance sheets, when we are deficient allowances or credits based on the product of the deficient amount as of the balance sheet date, if any, and the market price of the allowances or credits at the balance sheet date. The cost of allowances or credits used for compliance is reflected in cost of revenues on the consolidated statements of income. Any gains or losses on the sale or expiration of allowances or credits are classified as other income on the consolidated statements of income. Proceeds from the sale of allowances or credits are reported in investing activities - all other, net on the consolidated statements of cash flow.

Short-term Investments (Tables)

Short-term Investments (Tables)	12 Months Ended
	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation	The components of investments were as follows: December 31, 2022 (Millions of dollars) 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 $ 3,074 $ — $ (1) $ 3,073 $ 1,106 $ 1,967 Certificates of deposit and time deposits Level 2 2,093 — — 2,093 1,500 593 U.S. government securities Level 1 1,071 — — 1,071 498 573 Corporate notes and bonds Level 2 66 — — 66 54 12 Total available-for-sale debt securities $ 6,304 $ — $ (1) $ 6,303 $ 3,158 $ 3,145 Cash 5,467 5,467 — Total $ 11,770 $ 8,625 $ 3,145 December 31, 2021 (Millions of dollars) 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)	12 Months Ended
	Dec. 31, 2022
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	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. (Millions of dollars) 2022 2021 2020 Revenues, other income and net gain on disposal of assets: Revenues and other income $ — $ 8,420 $ 19,919 Net gain on disposal of assets 60 11,682 1 Total revenues, other income and net gain on disposal of assets 60 20,102 19,920 Costs and expenses: Cost of revenues (excludes items below) — 7,654 17,573 Depreciation and amortization — 3 244 Selling, general and administrative expenses — 121 323 Other taxes — 75 193 Total costs and expenses — 7,853 18,333 Income from operations 60 12,249 1,587 Net interest and other financial costs — 6 20 Income before income taxes 60 12,243 1,567 Provision (benefit) for income taxes (12) 3,795 362 Income from discontinued operations, net of tax $ 72 $ 8,448 $ 1,205

Master Limited Partnership (Tab

Master Limited Partnership (Tables)	12 Months Ended
	Dec. 31, 2022
Noncontrolling Interest [Line Items]
Unit Repurchases	Total share repurchases were as follows for the respective periods: (In millions, except per share data) 2022 2021 2020 Number of shares repurchased 131 76 — Cash paid for shares repurchased $ 11,922 $ 4,654 $ — Average cost per share $ 91.20 $ 62.65 $ —
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 interest in MPLX were as follows: (Millions of dollars) 2022 2021 2020 Decrease due to change in ownership $ (164) $ (166) $ (27) Tax impact 44 73 (14) Decrease in MPC's additional paid-in capital, net of tax $ (120) $ (93) $ (41)
MPLX
Noncontrolling Interest [Line Items]
Unit Repurchases	Total unit repurchases were as follows for the respective periods: (In millions, except per share data) 2022 2021 2020 Number of common units repurchased 15 23 1 Cash paid for common units repurchased $ 491 $ 630 $ 33 Average cost per unit $ 31.96 $ 27.52 $ 22.29

Impairments (Tables)

Impairments (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Details of Impairment of Long-Lived Assets Held and Used by Asset	The table below provides information related to the impairments recognized, along with the location of these impairments within the consolidated statements of income. (Millions of dollars) Income Statement Line 2022 2021 2020 Goodwill Impairment expense $ — $ — $ 7,394 Equity method investments Income (loss) from equity method investments — 13 1,315 Long-lived assets Impairment expense (a) — — 1,032 Long-lived assets Depreciation and amortization — 56 — Total impairments $ — $ 69 $ 9,741

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]
Summarized Balance Sheet Information of VIEs	The following table presents balance sheet information for the assets and liabilities of MPLX, which are included in our consolidated balance sheets. (Millions of dollars) December 31, December 31, Assets Cash and cash equivalents $ 238 $ 13 Receivables, less allowance for doubtful accounts 747 660 Inventories 148 142 Other current assets 56 55 Equity method investments 4,095 3,981 Property, plant and equipment, net 18,848 20,042 Goodwill 7,645 7,657 Right of use assets 283 268 Other noncurrent assets 1,664 891 Liabilities Accounts payable $ 664 $ 671 Payroll and benefits payable 4 6 Accrued taxes 67 75 Debt due within one year 988 499 Operating lease liabilities 46 59 Other current liabilities 338 304 Long-term debt 18,808 18,072 Deferred income taxes 13 10 Long-term operating lease liabilities 230 205 Deferred credits and other liabilities 366 559

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2022
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	Transactions with related parties were as follows: (Millions of dollars) 2022 2021 2020 Sales to related parties $ 144 $ 93 $ 123 Purchases from related parties 1,175 962 738

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Summary of Earnings Per Common Share	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 (loss) per share using the two-class method. Diluted income (loss) per share assumes exercise of certain share-based compensation awards, provided the effect is not anti-dilutive. (In millions, except per share data) 2022 2021 2020 Income (loss) from continuing operations, net of tax $ 15,978 $ 2,553 $ (11,182) Less: Net income (loss) attributable to noncontrolling interest 1,534 1,263 (151) Net income allocated to participating securities 8 2 1 Income (loss) from continuing operations available to common stockholders 14,436 1,288 (11,032) Income from discontinued operations, net of tax 72 8,448 1,205 Income (loss) available to common stockholders $ 14,508 $ 9,736 $ (9,827) Weighted average common shares outstanding: Basic 512 634 649 Effect of dilutive securities 4 4 — Diluted 516 638 649 (In millions, except per share data) 2022 2021 2020 Income (loss) available to common stockholders per share: Basic: Continuing operations $ 28.17 $ 2.03 $ (16.99) Discontinued operations 0.14 13.31 1.86 Net income (loss) per share $ 28.31 $ 15.34 $ (15.13) Diluted: Continuing operations $ 27.98 $ 2.02 $ (16.99) Discontinued operations 0.14 13.22 1.86 Net income (loss) per share $ 28.12 $ 15.24 $ (15.13)
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. (In millions) 2022 2021 2020 Shares issuable under share-based compensation plans — 3 11

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Share Repurchases	Total share repurchases were as follows for the respective periods: (In millions, except per share data) 2022 2021 2020 Number of shares repurchased 131 76 — Cash paid for shares repurchased $ 11,922 $ 4,654 $ — Average cost per share $ 91.20 $ 62.65 $ —

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Adjusted EBITDA	(Millions of dollars) 2022 2021 2020 Segment adjusted EBITDA for reportable segments Refining & Marketing 19,261 $ 3,518 $ (1,939) Midstream 5,772 5,410 5,061 Total reportable segments $ 25,033 $ 8,928 $ 3,122 Reconciliation of segment adjusted EBITDA for reportable segments to income (loss) from continuing operations before income taxes Total reportable segments $ 25,033 $ 8,928 $ 3,122 Corporate (698) (587) (635) Refining planned turnaround costs (1,122) (582) (832) Storm impacts — (70) — LIFO inventory (charge) credit 148 — (561) Gain on sale of assets (a) 1,058 — 66 Renewable volume obligation requirements (b) 238 — — Litigation 27 — 84 Impairments (c) — (13) (9,741) Idling facility expenses — (12) — Restructuring expenses (d) — — (367) Transaction related costs (e) — — (8) Depreciation and amortization (3,215) (3,364) (3,375) Net interest and other financial costs (1,000) (1,483) (1,365) Income (loss) from continuing operations before income taxes $ 20,469 $ 2,817 $ (13,612) (a) 2022 includes the non-cash gain related to the contribution of assets by MPC on the formation of the Martinez Renewables joint venture and the non-cash gain on lease reclassification. See Note 16 and 28 for additional information. (b) Represents retroactive changes in renewable volume obligation requirements published by the EPA in June 2022 for the 2020 and 2021 annual obligations. (c) 2021 reflects impairments of equity method investments. 2020 reflects impairments of goodwill, equity method investments and long lived assets. See Note 7. (d) See Note 19.
Reconciliation of Revenue from Segments to Consolidated	(Millions of dollars) 2022 2021 2020 Sales and other operating revenues Refining & Marketing Revenues from external customers (a) $ 172,087 $ 115,350 $ 66,180 Intersegment revenues 118 144 67 Refining & Marketing segment revenues 172,205 115,494 66,247 Midstream Revenues from external customers (a) 5,366 4,633 3,599 Intersegment revenues 5,224 4,986 4,839 Midstream segment revenues 10,590 9,619 8,438 Total segment revenues 182,795 125,113 74,685 Less: intersegment revenues 5,342 5,130 4,906 Consolidated sales and other operating revenues $ 177,453 $ 119,983 $ 69,779 (a) Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 5 and 9 for additional information.
Other Significant Reconciling Items from Segments to Consolidated	(Millions of dollars) 2022 2021 2020 Income (loss) from equity method investments Refining & Marketing $ 31 $ 59 $ 2 Midstream 624 412 378 Corporate (a) — (13) (1,315) Consolidated income (loss) from equity method investments $ 655 $ 458 $ (935) Depreciation and amortization Refining & Marketing $ 1,850 $ 1,870 $ 1,857 Midstream 1,310 1,329 1,353 Corporate (b) 55 165 165 Consolidated depreciation and amortization $ 3,215 $ 3,364 $ 3,375 Capital expenditures Refining & Marketing $ 1,508 $ 911 $ 1,170 Midstream 1,069 731 1,398 Segment capital expenditures and investments 2,577 1,642 2,568 Less investments in equity method investees 405 210 485 Plus: Corporate 108 105 80 Capitalized interest 103 68 106 Consolidated capital expenditures (c) $ 2,383 $ 1,605 $ 2,269 (a) Impairment of equity method investment. See Note 7. (b) 2021 includes an impairment of $ 56 million (c) Includes changes in capital expenditure accruals. See Note 24 for a reconciliation of total capital expenditures to additions to property, plant and equipment as reported in the consolidated statements of cash flows.

Net Interest and Other Financ_2

Net Interest and Other Financial Costs (Tables)	12 Months Ended
	Dec. 31, 2022
Other Income and Expenses [Abstract]
Net Interest And Other Financial Income (Costs)	Net interest and other financial costs were as follows: (Millions of dollars) 2022 2021 2020 Interest income $ (191) $ (14) $ (9) Interest expense 1,299 1,340 1,462 Interest capitalized (104) (73) (129) Pension and other postretirement non-service costs (a) 3 64 11 (Gain) loss on extinguishment of debt 2 133 (9) Investments - net premium (discount) amortization (30) (1) — Other financial costs 21 34 39 Net interest and other financial costs $ 1,000 $ 1,483 $ 1,365

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Components Of Income Tax Provisions (Benefits)	The provision (benefit) for income taxes from continuing operations consisted of: (Millions of dollars) 2022 2021 2020 Current: Federal $ 3,565 $ 380 $ (2,267) State and local 629 48 69 Foreign 7 5 9 Total current 4,201 433 (2,189) Deferred: Federal 191 (164) 90 State and local 98 (6) (347) Foreign 1 1 16 Total deferred 290 (169) (241) Income tax provision (benefit) $ 4,491 $ 264 $ (2,430)
Reconciliation Of Federal Statutory Income Tax Rate	A reconciliation of the federal statutory income tax rate to the effective tax rate applied to income (loss) from continuing operations before income taxes follows: 2022 2021 2020 Federal statutory rate 21 % 21 % 21 % State and local income taxes, net of federal income tax effects 3 2 2 Goodwill impairment — — (8) Noncontrolling interests (2) (9) — Legislation — (3) 4 Other — (2) (1) Effective tax rate applied to income (loss) from continuing operations before income taxes 22 % 9 % 18 %
Components Of Deferred Tax Assets And Liabilities	Deferred tax assets and liabilities resulted from the following: December 31, (Millions of dollars) 2022 2021 Deferred tax assets: Employee benefits $ 481 $ 495 Environmental remediation 84 91 Finance lease obligations 371 339 Operating lease liabilities 224 263 Net operating loss carryforwards 44 122 Tax credit carryforwards 20 19 Goodwill and other intangibles 56 35 Other 44 58 Total deferred tax assets 1,324 1,422 Deferred tax liabilities: Property, plant and equipment 2,656 2,716 Inventories 686 717 Investments in subsidiaries and affiliates 3,660 3,350 Right of use assets 223 257 Other 2 18 Total deferred tax liabilities 7,227 7,058 Net deferred tax liabilities $ 5,903 $ 5,636 Net deferred tax liabilities were classified in the consolidated balance sheets as follows: December 31, (Millions of dollars) 2022 2021 Assets: Other noncurrent assets $ 1 $ 2 Liabilities: Deferred income taxes 5,904 5,638 Net deferred tax liabilities $ 5,903 $ 5,636
Summary Of Activity In Unrecognized Tax Benefits	The following table summarizes the activity in unrecognized tax benefits: (Millions of dollars) 2022 2021 2020 January 1 balance $ 37 $ 23 $ 32 Additions for tax positions of current year — 6 — Additions for tax positions of prior years 38 19 12 Reductions for tax positions of prior years (2) (4) (18) Settlements (15) (6) (3) Statute of limitations (1) (1) — December 31 balance $ 57 $ 37 $ 23

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Summary Of Inventories	December 31, (Millions of dollars) 2022 2021 Crude oil $ 3,047 $ 2,639 Refined products 4,748 4,460 Materials and supplies 1,032 956 Total $ 8,827 $ 8,055

Equity Method Investments (Tabl

Equity Method Investments (Tables)	12 Months Ended
	Dec. 31, 2022
Equity Method Investments and Joint Ventures [Abstract]
Schedule Of Equity Method Investments	Ownership as of Carrying value at December 31, December 31, (In millions of dollars, except ownership percentages) VIE 2022 2022 2021 Refining & Marketing The Andersons Marathon Holdings LLC 50% $ 204 $ 194 Martinez Renewables LLC X 50% 1,070 — Watson Cogeneration Company —% — 28 Other (a) X 54 19 Refining & Marketing Total $ 1,328 $ 241 Midstream MPLX Andeavor Logistics Rio Pipeline LLC X 67% $ 177 $ 183 Centrahoma Processing LLC 40% 131 133 Illinois Extension Pipeline Company, L.L.C 35% 236 243 LOOP LLC 41% 287 265 MarEn Bakken Company LLC 25% 475 449 MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. X 67% 335 332 MarkWest Torñado GP, L.L.C. X 60% 306 246 MarkWest Utica EMG, L.L.C. X 57% 669 680 Minnesota Pipe Line Company, LLC 17% 178 183 Rendezvous Gas Services, L.L.C. X 78% 137 147 Sherwood Midstream Holdings LLC X 51% 125 136 Sherwood Midstream LLC X 50% 512 544 Whistler Pipeline LLC X 38% 211 155 Other (a) X 316 285 MPLX Total $ 4,095 $ 3,981 MPC-Retained Capline Pipeline Company LLC X 33% $ 404 $ 399 Crowley Coastal Partners, LLC X 50% 55 185 Gray Oak Pipeline, LLC 25% 302 318 LOOP LLC 10% 71 66 South Texas Gateway Terminal LLC 25% 170 173 Other (a) X 41 46 MPC-Retained Total $ 1,043 $ 1,187 Midstream Total $ 5,138 $ 5,168 Total $ 6,466 $ 5,409 (a) Some investments included within “Other” have been deemed to be VIEs.
Investment Company, Nonconsolidated Subsidiary, Summarized Financial Information	Summarized financial information for all equity method investments in affiliated companies, combined, was as follows: (Millions of dollars) 2022 2021 2020 Income statement data: Revenues and other income $ 5,069 $ 4,343 $ 3,013 Income from operations 1,907 1,389 599 Net income 1,740 1,230 454 Balance sheet data – December 31: Current assets $ 1,811 $ 1,233 Noncurrent assets 20,324 18,071 Current liabilities 1,478 801 Noncurrent liabilities 4,750 5,141

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Summary Of Property, Plant And Equipment	December 31, 2022 December 31, 2021 (Millions of dollars) Gross Accumulated Depreciation Net Gross Accumulated Depreciation Net Refining & Marketing $ 32,292 $ 16,745 $ 15,547 $ 31,089 $ 14,876 $ 16,213 Midstream 27,659 8,118 19,541 28,098 7,384 20,714 Corporate 1,550 981 569 1,446 933 513 Total (a) $ 61,501 $ 25,844 $ 35,657 $ 60,633 $ 23,193 $ 37,440 (a) Includes finance leases. See Note 28.

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for 2022 were as follows: (Millions of dollars) Refining & Marketing Midstream Total Balance as of December 31, 2020 $ 561 $ 7,695 $ 8,256 Impairment losses — — — Balance as of December 31, 2021 561 7,695 8,256 Impairment losses — — — Disposal of assets — (12) (12) Balance as of December 31, 2022 $ 561 $ 7,683 $ 8,244 Gross goodwill as of December 31, 2022 $ 6,141 $ 10,824 $ 16,965 Accumulated impairment losses (5,580) (3,141) (8,721) Balance as of December 31, 2022 $ 561 $ 7,683 $ 8,244
Schedule of Acquired Finite-Lived Intangible Assets by Major Class	Our definite lived intangible assets as of December 31, 2022 and 2021 are as shown below. December 31, 2022 December 31, 2021 (Millions of dollars) Gross Accumulated Amortization Net Gross Accumulated Amortization Net Customer contracts and relationships $ 3,624 $ 1,825 $ 1,799 $ 3,495 $ 1,457 $ 2,038 Brand rights and tradenames 100 64 36 100 50 50 Royalty agreements 138 103 35 135 96 39 Other 36 30 6 36 28 8 Total $ 3,898 $ 2,022 $ 1,876 $ 3,766 $ 1,631 $ 2,135
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Estimated future amortization expense for the next five years related to the intangible assets at December 31, 2022 is as follows: (Millions of dollars) 2023 $ 315 2024 257 2025 241 2026 221 2027 193

Restructuring (Tables)

Restructuring (Tables)	12 Months Ended
	Dec. 31, 2022
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	(Millions of dollars) Employee separation costs Exit and disposal costs Total Restructuring reserve balance at September 30, 2020 (a) $ 158 $ 133 $ 291 Adjustments 14 5 19 Cash payments (134) (35) (169) Restructuring reserve balance at December 31, 2020 38 103 141 Cash payments (38) (44) (82) Restructuring reserve balance at December 31, 2021 — 59 59 Cash payments — (13) (13) Restructuring reserve balance at December 31, 2022 $ — $ 46 $ 46 (a) The restructuring reserve was zero until the third quarter of 2020.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 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 December 31, 2022 and 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. December 31, 2022 Fair Value Hierarchy (Millions of dollars) Level 1 Level 2 Level 3 Netting and Collateral (a) Net Carrying Value on Balance Sheet (b) Collateral Pledged Not Offset Assets: Commodity contracts $ 310 $ — $ — $ (243) $ 67 $ 100 Liabilities: Commodity contracts $ 301 $ — $ — $ (301) $ — $ — Embedded derivatives in commodity contracts — — 61 — 61 — December 31, 2021 Fair Value Hierarchy (Millions of dollars) 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 December 31, 2022, cash collateral of $58 million was netted with mark-to-market 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 which are subject to 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. (Millions of dollars) 2022 2021 Beginning balance $ 108 $ 63 Unrealized and realized (gain)/loss included in net income (35) 59 Settlements of derivative instruments (12) (14) Ending balance $ 61 $ 108 The amount of total (gain)/ loss for the period included in earnings attributable to the change in unrealized (gain)/loss relating to liabilities still held at the end of period: $ (33) $ 47

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2022
Summary of Derivative Instruments [Abstract]
Classification of Fair Values of Derivative Instruments, Excluding Cash Collateral	The following table presents the fair value of derivative instruments as of December 31, 2022 and 2021 and the line items in the consolidated 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. (Millions of dollars) December 31, 2022 December 31, 2021 Balance Sheet Location Asset Liability Asset Liability Commodity derivatives Other current assets $ 310 $ 301 $ 271 $ 249 Other current liabilities (a) — 10 — 15 Deferred credits and other liabilities (a) — 51 — 93 (a) Includes embedded derivatives.
Schedule of Notional Amounts of Outstanding Derivative Positions	The table below summarizes open commodity derivative contracts for crude oil, refined products and blending products as of December 31, 2022. Percentage of contracts that expire next quarter Position (Units in thousands of barrels) Long Short Exchange-traded (a) Crude oil 65.1% 69,275 82,639 Refined products 76.6% 16,669 9,226 Blending products 98.8% 1,443 4,885 Soybean oil 53.5% 2,103 2,623 (a) Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 29,651 long and 29,876 short; Refined products - 1,390 long and 25 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: (Millions of dollars) Gain (Loss) Income Statement Location 2022 2021 2020 Sales and other operating revenues $ — $ (47) $ 72 Cost of revenues (58) (333) 34 Other income — — 1 Total $ (58) $ (380) $ 107

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding Borrowings	Our outstanding borrowings at December 31, 2022 and 2021 consisted of the following: (Millions of dollars) December 31, December 31, Marathon Petroleum Corporation: Senior notes $ 6,449 $ 6,449 Notes payable 1 1 Finance lease obligations 522 589 Total 6,972 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 27,080 25,948 Unamortized debt issuance costs (142) (129) Unamortized discount, net of unamortized premium (238) (280) Amounts due within one year (1,066) (571) Total long-term debt due after one year $ 25,634 $ 24,968
Schedule Of Debt Payments	Principal maturities of long-term debt, excluding finance lease obligations, as of December 31, 2022 for the next five years are as follows: (Millions of dollars) 2023 $ 1,000 2024 1,901 2025 2,950 2026 2,249 2027 2,000
Schedule of Line of Credit Facilities	(Millions of dollars) Total Outstanding Outstanding Available Weighted Expiration MPC, excluding MPLX MPC bank revolving credit facility $ 5,000 $ — $ 1 $ 4,999 — July 2027 MPC trade receivables securitization facility (a) 100 — 100 — — September 2023 MPLX MPLX bank revolving credit facility 2,000 — — 2,000 — July 2027 (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 December 31, 2022, letters of credit in the total amount of $1.05 billion 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.
Marathon Petroleum Corporation | Senior Notes
Debt Instrument [Line Items]
Outstanding Borrowings	December 31, (Millions of dollars) 2022 2021 Senior notes, 3.625% due September 2024 750 750 Senior notes, 4.700% due May 2025 1,250 1,250 Senior notes, 5.125% due December 2026 719 719 Senior notes, 3.800% due April 2028 496 496 Senior notes, 6.500% due March 2041 1,250 1,250 Senior notes, 4.750% due September 2044 800 800 Senior notes, 5.850% due December 2045 250 250 Senior notes, 4.500% due April 2048 498 498 Andeavor senior notes, 3.800% - 5.125% due 2026 – 2048 36 36 Senior notes, 5.000%, due September 2054 400 400 Total $ 6,449 $ 6,449
MPLX | Senior Notes
Debt Instrument [Line Items]
Outstanding Borrowings	December 31, (Millions of dollars) 2022 2021 Senior notes, 3.500% due December 2022 $ — $ 486 Senior notes, 3.375% due March 2023 — 500 Senior notes, 4.500% due July 2023 989 989 Senior notes, 4.875% due December 2024 1,149 1,149 Senior notes, 4.000% due February 2025 500 500 Senior notes, 4.875% due June 2025 1,189 1,189 MarkWest senior notes, 4.500% - 4.875% due 2023 – 2025 23 23 Senior notes, 1.750% due March 2026 1,500 1,500 Senior notes, 4.125% due March 2027 1,250 1,250 Senior notes, 4.250% due December 2027 732 732 Senior notes, 4.000% due March 2028 1,250 1,250 Senior notes, 4.800% due February 2029 750 750 Senior notes, 2.650% due August 2030 1,500 1,500 December 31, (Millions of dollars) 2022 2021 Senior notes, 4.950% due September 2032 1,000 — Senior notes, 4.500% due April 2038 1,750 1,750 Senior notes, 5.200% due March 2047 1,000 1,000 Senior notes, 5.200% due December 2047 487 487 ANDX senior notes, 3.500% - 5.250% due 2022 – 2047 31 45 Senior notes, 4.700% due April 2048 1,500 1,500 Senior notes, 5.500% due February 2049 1,500 1,500 Senior notes, 4.950% due March 2052 1,500 — Senior notes, 4.900% due April 2058 500 500 Total $ 20,100 $ 18,600

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents our revenues from external customers disaggregated by segment and product line: (Millions of dollars) 2022 2021 2020 Refining & Marketing Refined products $ 161,362 $ 107,345 $ 61,648 Crude oil 8,962 7,132 4,023 Services and other 1,763 873 509 Total revenues from external customers 172,087 115,350 66,180 Midstream Refined products 2,219 1,590 641 Services and other (a) 3,147 3,043 2,958 Total revenues from external customers 5,366 4,633 3,599 Sales and other operating revenues $ 177,453 $ 119,983 $ 69,779 (a) Includes sales-type lease revenue. See Note 28.

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Summary of Supplemental Cash Flow Information	(Millions of dollars) 2022 2021 2020 Net cash provided by operating activities included: Interest paid (net of amounts capitalized) $ 1,060 $ 1,231 $ 1,235 Net income taxes paid to (received from) taxing authorities 4,869 2,436 (179) Cash paid for amounts included in the measurement of lease liabilities Payments on operating leases 498 569 651 Interest payments under finance lease obligations 24 21 25 Net cash provided by financing activities included: Principal payments under finance lease obligations 79 71 66 Non-cash investing and financing activities: Right of use assets obtained in exchange for new operating lease obligations 367 349 343 Right of use assets obtained in exchange for new finance lease obligations 60 37 110 Contribution of assets (a) 818 — — Book value of equity method investment (b) 150 — — (a) Represents the book value of property, plant and equipment, inventory and working capital contributed by MPC to Martinez Renewables LLC. See Note 16 for additional information. (b) Represents the book value of MPC’s equity method investment in Watson Cogeneration Company and Crowley Ocean Partners prior to MPC buying out the remaining interest in these entities. See Note 16 for additional information.
Schedule Of 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: (Millions of dollars) 2022 2021 2020 Additions to property, plant and equipment per the consolidated statements of cash flows $ 2,420 $ 1,464 $ 2,787 Increase (decrease) in capital accruals (37) 141 (518) Total capital expenditures $ 2,383 $ 1,605 $ 2,269

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Changes in Accumulated Other Comprehensive Loss by Component	The following table shows the changes in accumulated other comprehensive income (loss) by component. Amounts in parentheses indicate debits. (Millions of dollars) Pension Benefits Other Benefits Other Total Balance as of December 31, 2020 $ (338) $ (181) $ 7 $ (512) Other comprehensive income (loss) before reclassifications, net of tax of $127 171 220 (5) 386 Amounts reclassified from accumulated other comprehensive loss: Amortization of prior service cost (credit) (a) (45) 2 — (43) Amortization of actuarial loss (a) 37 10 — 47 Settlement loss (a) 75 1 — 76 Other — — (1) (1) Tax effect (17) (3) — (20) Other comprehensive income (loss) 221 230 (6) 445 Balance as of December 31, 2021 $ (117) $ 49 $ 1 $ (67) (Millions of dollars) Pension Benefits Other Benefits Other Total Balance as of December 31, 2021 $ (117) $ 49 $ 1 $ (67) Other comprehensive income (loss) before reclassifications, net of tax of $11 (70) 129 (1) 58 Amounts reclassified from accumulated other comprehensive loss: Amortization of prior service credit (a) (45) (22) — (67) Amortization of actuarial loss (a) 4 6 — 10 Settlement loss (a) 79 — — 79 Tax effect (14) 3 — (11) Other comprehensive income (loss) (46) 116 (1) 69 Balance as of December 31, 2022 $ (163) $ 165 $ — $ 2 (a) These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 26.

Pension and Other Postretirem_2

Pension and Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined Contribution Plan Disclosures	Benefits for service beginning January 1, 2010 and beginning on January 1, 2016 are based on a cash balance formula with an annual percentage of eligible pay credited based upon age and years of service or at a flat rate of eligible pay, depending on covered employee group. Substantially all of our employees also accrue benefits under a defined contribution plan. (Millions of dollars) 2022 2021 2020 Cash balance weighted average interest crediting rates 3.00 % 3.00 % 3.00 %
Summary Of Projected Benefit Obligations And Funded Status For Defined Benefit Pension And Other Postretirement Plans	The following summarizes the projected benefit obligations and funded status for our defined benefit pension and other postretirement plans: Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2022 2021 Benefit obligations at January 1 $ 3,295 $ 3,671 $ 828 $ 1,131 Service cost 228 297 26 34 Interest cost 102 93 21 30 Actuarial gain (a) (653) (169) (168) (16) Benefits paid (b) (613) (594) (57) (75) Plan amendments — — — (276) Other — (3) — — Benefit obligations at December 31 2,359 3,295 650 828 Fair value of plan assets at January 1 3,043 2,621 — — Actual return on plan assets (622) 194 — — Employer contributions (c) 30 822 57 75 Benefits paid from plan assets (613) (594) (57) (75) Fair value of plan assets at December 31 1,838 3,043 — — Funded status at December 31 $ (521) $ (252) $ (650) $ (828) (a) The primary driver of the actuarial gain for the pension and other postretirement benefits plans in 2022 was the increase in discount rate compared to 2021. (b) Of the $613 million in benefits paid in 2022, $285 million is related to the pension annuity lift-out. (c) Of the $822 million in pension employer contributions in 2021, $763 million was voluntary contributions.
Schedule of Amounts Recognized in Balance Sheet	Amounts recognized in the consolidated balance sheet for our pension and other postretirement benefit plans at December 31 include: Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2022 2021 Current liabilities $ (7) $ (11) $ (50) $ (54) Noncurrent liabilities (514) (241) (600) (774) Accrued benefit cost $ (521) $ (252) $ (650) $ (828)
Schedule of Net Periodic Benefit Cost Not yet Recognized	Included in accumulated other comprehensive loss at December 31 were the following before-tax amounts that had not been recognized in net periodic benefit cost: Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2022 2021 Net actuarial loss $ 386 $ 360 $ 19 $ 192 Prior service credit (114) (159) (224) (246) Amounts exclude those related to LOOP and Explorer, equity method investees with defined benefit pension and postretirement plans for which net losses (gains) of $11 million and $(1) million were recorded in accumulated other comprehensive income (loss) in 2022, reflecting our ownership share.
Components of Net Periodic Benefit Costs	The following summarizes the net periodic benefit costs and the amounts recognized as other comprehensive loss (pretax) for our defined benefit pension and other postretirement plans. Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2020 2022 2021 2020 Service cost $ 230 $ 287 $ 283 $ 26 $ 34 $ 35 Interest cost 102 93 98 21 30 32 Expected return on plan assets (142) (139) (133) — — — Amortization of prior service cost (credit) (45) (45) (45) (22) 2 — Amortization of actuarial loss 4 37 36 6 10 3 Settlement loss 79 75 20 — 1 — Net periodic benefit cost (a) $ 228 $ 308 $ 259 $ 31 $ 77 $ 70 Actuarial (gain) loss $ 109 $ (227) $ 179 $ (167) $ (16) $ 83 Prior service credit — — — — (276) — Amortization of actuarial loss (83) (112) (56) (6) (11) (3) Amortization of prior service (cost) credit 45 45 45 22 (2) — Total recognized in other comprehensive (income) loss $ 71 $ (294) $ 168 $ (151) $ (305) $ 80 Total recognized in net periodic benefit cost and other comprehensive (income) loss $ 299 $ 14 $ 427 $ (120) $ (228) $ 150 (a) Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years.
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (Pretax)	The following summarizes the net periodic benefit costs and the amounts recognized as other comprehensive loss (pretax) for our defined benefit pension and other postretirement plans. Pension Benefits Other Benefits (Millions of dollars) 2022 2021 2020 2022 2021 2020 Service cost $ 230 $ 287 $ 283 $ 26 $ 34 $ 35 Interest cost 102 93 98 21 30 32 Expected return on plan assets (142) (139) (133) — — — Amortization of prior service cost (credit) (45) (45) (45) (22) 2 — Amortization of actuarial loss 4 37 36 6 10 3 Settlement loss 79 75 20 — 1 — Net periodic benefit cost (a) $ 228 $ 308 $ 259 $ 31 $ 77 $ 70 Actuarial (gain) loss $ 109 $ (227) $ 179 $ (167) $ (16) $ 83 Prior service credit — — — — (276) — Amortization of actuarial loss (83) (112) (56) (6) (11) (3) Amortization of prior service (cost) credit 45 45 45 22 (2) — Total recognized in other comprehensive (income) loss $ 71 $ (294) $ 168 $ (151) $ (305) $ 80 Total recognized in net periodic benefit cost and other comprehensive (income) loss $ 299 $ 14 $ 427 $ (120) $ (228) $ 150 (a) Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years.
Plan Assumptions	The following summarizes the assumptions used to determine the benefit obligations at December 31, and net periodic benefit cost for the defined benefit pension and other postretirement plans for 2022, 2021 and 2020. Pension Benefits Other Benefits 2022 2021 2020 2022 2021 2020 Benefit obligation: Discount rate 5.04 % 2.82 % 2.44 % 5.08 % 2.93 % 2.55 % Rate of compensation increase 4.18 % 5.70 % 5.70 % 4.18 % 5.70 % 5.70 % Net periodic benefit cost: Discount rate 3.33 % 2.70 % 3.00 % 2.93 % 2.55 % 3.23 % Expected long-term return on plan assets 5.75 % 5.75 % 5.75 % — % — % — % Rate of compensation increase 4.18 % 5.70 % 5.70 % 4.18 % 5.70 % 5.70 %
Assumed Health Care Cost Trend Rates	The following summarizes the assumed health care cost trend rates. December 31, 2022 2021 2020 Health care cost trend rate assumed for the following year: Medical: Pre-65 6.60 % 5.80 % 6.00 % Prescription drugs 8.90 % 6.40 % 7.00 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate): Medical: Pre-65 4.50 % 4.50 % 4.50 % Prescription drugs 4.50 % 4.50 % 4.50 % Year that the rate reaches the ultimate trend rate: Medical: Pre-65 2031 2030 2028 Prescription drugs 2031 2030 2028
Fair Values Of Defined Benefit Pension Plan Assets	The following tables present the fair values of our defined benefit pension plans’ assets, by level within the fair value hierarchy, as of December 31, 2022 and 2021. December 31, 2022 December 31, 2021 (Millions of dollars) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash and cash equivalents $ — $ 3 $ — $ 3 $ — $ 47 $ — $ 47 Equity: Common stocks 40 — — 40 61 — — 61 Mutual funds 104 — — 104 170 — — 170 Pooled funds — 742 — 742 — 1,192 — 1,192 Fixed income: Corporate — 582 — 582 — 800 — 800 Government 211 41 — 252 415 108 — 523 Pooled funds — 79 — 79 — 192 — 192 Private equity — — 13 13 — — 19 19 Real estate — — 14 14 — — 17 17 Other — 5 4 9 1 3 18 22 Total investments, at fair value $ 355 $ 1,452 $ 31 $ 1,838 $ 647 $ 2,342 $ 54 $ 3,043
Reconciliation Of Beginning And Ending Balances Of Plan Assets Classified As Level 3	The following is a reconciliation of the beginning and ending balances recorded for plan assets classified as Level 3 in the fair value hierarchy: 2022 2021 (Millions of dollars) Private Equity Real Estate Other Private Equity Real Estate Other Beginning balance $ 19 $ 17 $ 18 $ 23 $ 20 $ 19 Actual return on plan assets: Realized 3 2 — 2 1 — Unrealized (4) (2) 7 8 1 — Purchases — 1 — — — — Sales (5) (4) (21) (14) (5) (1) Ending balance $ 13 $ 14 $ 4 $ 19 $ 17 $ 18
Estimated Future Benefit Payment	The following gross benefit payments, which reflect expected future service, as appropriate, are expected to be paid in the years indicated. (Millions of dollars) Pension Benefits Other Benefits 2023 $ 148 $ 50 2024 155 50 2025 165 50 2026 173 50 2027 175 50 2028 through 2032 1,010 258
Multiemployer Plan	Our participation in this plan for 2022, 2021 and 2020 is outlined in the table below. The “EIN” column provides the Employee Identification Number for the plan. The most recent Pension Protection Act zone status available in 2022 and 2021 is for the plan’s year ended December 31, 2021 and December 31, 2020, respectively. The zone status is based on information that we received from the plan and is certified by the plan’s actuary. Among other factors, plans in the red zone are generally less than 65 percent funded. The “FIP/RP Status Pending/Implemented” column indicates a financial improvement plan or a rehabilitation plan has been implemented. The last column lists the expiration date of the collective-bargaining agreement to which the plan is subject. There have been no significant changes that affect the comparability of 2022, 2021 and 2020 contributions. Our portion of the contributions does not make up more than five percent of total contributions to the plan. Pension FIP/RP Status MPC Contributions Millions of dollars ) Surcharge Expiration Date of Pension Fund EIN 2022 2021 2022 2021 2020 Central States, Southeast and Southwest Areas Pension Plan (a) 366044243 Red Red Implemented $ 5 $ 5 $ 5 No January 31, 2024 (a) This agreement has a minimum contribution requirement of $338 per week per employee for 2023. A total of 258 employees participated in the plan as of December 31, 2022.

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	The following table reflects activity related to our share-based compensation arrangements, including the converted awards related to the acquisition of Andeavor: (Millions of dollars) 2022 2021 2020 Share-based compensation expense $ 153 $ 88 $ 100 Tax benefit recognized on share-based compensation expense 37 22 25 Cash received by MPC upon exercise of stock option awards 243 106 11 Tax benefit received for tax deductions for stock awards exercised 53 13 16
Summary of Stock Option Award Activity	The following is a summary of our common stock option activity in 2022: Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Terms (in years) Aggregate Intrinsic Value (Millions of dollars) Outstanding at December 31, 2021 7,795,036 $ 46.23 Exercised (5,267,328) 46.16 Forfeited or expired (38,474) 20.87 Outstanding at December 31, 2022 2,489,234 46.78 Vested and expected to vest at December 31, 2022 2,488,962 46.78 4.1 $ 173 Exercisable at December 31, 2022 2,000,853 51.77 3.3 129
Summary of Restricted Stock Award Activity	The following is a summary of restricted stock and restricted stock unit award activity of our common stock in 2022: Restricted Stock Restricted Stock Units Number of Weighted Number of Weighted Unvested at December 31, 2021 194,629 $ 60.95 2,313,919 $ 35.84 Granted — — 653,378 75.81 Vested (191,833) 60.98 (1,026,720) 34.24 Forfeited (2,105) 60.92 (154,427) 47.64 Unvested at December 31, 2022 691 54.60 1,786,150 50.36
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity, Vested And Unvested	The following is a summary of the values related to restricted stock and restricted stock unit awards held by MPC employees and non-employee directors: Restricted Stock Restricted Stock Units Intrinsic Value of Awards Vested During the Period (Millions of dollars) Weighted Average Grant Date Fair Value of Awards Granted During the Period Intrinsic Value of Awards Vested During the Period (Millions of dollars) Weighted Average Grant Date Fair Value of Awards Granted During the Period 2022 $ 17 $ — $ 99 $ 75.81 2021 20 — 90 55.27 2020 18 56.49 59 22.82
Schedule of Performance Unit Awards	The following table presents a summary of the 2022 activity for performance unit awards to be settled in shares: Number of Units Weighted Average Grant Date Fair Value Unvested at December 31, 2021 6,255,283 $ 0.78 Vested (6,221,223) 0.77 Forfeited (34,060) 0.89 Unvested at December 31, 2022 — —
Schedule of Share-based Compensation, Performance Unit Awards, Valuation Assumptions	Performance units to be settled in MPC shares have a grant date fair value calculated using a Monte Carlo valuation model, which requires the input of subjective assumptions. The following table provides a summary of these assumptions: 2020 Risk-free interest rate 0.9 % Look-back period (in years) 2.8 Expected volatility 30.4 % Grant date fair value of performance units granted $ 0.89

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Lease, Cost	Under ASC 842, the components of lease cost are shown below. Lease costs for operating leases are recognized on a straight line basis and are reflected in the income statement based on the leased asset’s use. Lease costs for finance leases are reflected in depreciation and amortization and in net interest and other financial costs. (Millions of dollars) 2022 2021 2020 Finance lease cost: Amortization of right of use assets $ 81 $ 78 $ 72 Interest on lease liabilities 29 31 35 Operating lease cost 490 565 658 Variable lease cost 59 62 60 Short-term lease cost 772 446 649 Total lease cost $ 1,431 $ 1,182 $ 1,474
Assets and Liabilities Lessee	Supplemental consolidated balance sheet data related to leases were as follows: December 31, (Millions of dollars) 2022 2021 Operating leases Assets Right of use assets $ 1,214 $ 1,372 Liabilities Operating lease liabilities $ 368 $ 438 Long-term operating lease liabilities 841 927 Total operating lease liabilities $ 1,209 $ 1,365 Weighted average remaining lease term (in years) 5.1 5.0 Weighted average discount rate 3.55 % 3.11 % Finance leases Assets Property, plant and equipment, gross $ 818 $ 815 Less accumulated depreciation 412 336 Property, plant and equipment, net $ 406 $ 479 Liabilities Debt due within one year $ 79 $ 73 Long-term debt 451 525 Total finance lease liabilities $ 530 $ 598 Weighted average remaining lease term (in years) 9.9 10.3 Weighted average discount rate 5.09 % 5.04 %
Operating & Finance Leases, Liability, Maturity	As of December 31, 2022, maturities of lease liabilities for operating lease obligations and finance lease obligations having initial or remaining non-cancellable lease terms in excess of one year are as follows: (Millions of dollars) Operating Finance 2023 $ 403 $ 104 2024 308 87 2025 228 78 2026 140 75 2027 72 59 2028 and thereafter 172 268 Gross lease payments 1,323 671 Less: imputed interest 114 141 Total lease liabilities $ 1,209 $ 530
Operating Lease, Lease Income	Lease revenues are included in sales and other operating revenues on the consolidated statements of income. Lease revenues were as follows: (Millions of dollars) 2022 2021 2020 Operating leases: Rental income $ 327 $ 376 $ 398 Sales-type leases: Interest income (Sales-type rental revenue-fixed minimum) 46 — — Interest income (Revenue from variable lease payments) 16 — — Sales-type lease revenue $ 62 $ — $ —
Sales-type Lease, Lease Income	Lease revenues are included in sales and other operating revenues on the consolidated statements of income. Lease revenues were as follows: (Millions of dollars) 2022 2021 2020 Operating leases: Rental income $ 327 $ 376 $ 398 Sales-type leases: Interest income (Sales-type rental revenue-fixed minimum) 46 — — Interest income (Revenue from variable lease payments) 16 — — Sales-type lease revenue $ 62 $ — $ —
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity	The following is a schedule of minimum future rentals on the non-cancelable operating leases as of December 31, 2022: (Millions of dollars) 2023 $ 97 2024 95 2025 64 2026 37 2027 16 2028 and thereafter 21 Total minimum future rentals $ 330
Sales-type and Direct Financing Leases, Lease Receivable, Maturity	Annual minimum undiscounted lease payment receipts under our sales-type leases were as follows as of December 31, 2022: (Millions of dollars) 2023 $ 169 2024 156 2025 146 2026 137 2027 128 2028 and thereafter 970 Total minimum future rentals 1,706 Less: present value discount 765 Lease receivables (a) $ 941 Current lease receivables (b) $ 98 Long-term lease receivables (c) 843 Unguaranteed residual assets 66 Total sales-type lease assets $ 1,007 (a) This amount does not include the unguaranteed residual assets. (b) Presented in receivables, net on the consolidated balance sheets. (c) Presented in other noncurrent assets on the consolidated balance sheets. Capital expenditures related to assets subject to sales-type lease arrangements were $27 million for the year ended December 31, 2022. These amounts are reflected as additions to property, plant and equipment in the consolidated statements of cash flows.
Schedule of Property Subject to or Available for Operating Lease	The following schedule summarizes our investment in assets held under operating lease by major classes as of December 31, 2022 and 2021: December 31, (Millions of dollars) 2022 2021 Gathering and transportation $ 94 $ 991 Processing and fractionation 973 867 Terminals 128 128 Land, building and other 10 15 Property, plant and equipment 1,205 2,001 Less accumulated depreciation 330 523 Total property, plant and equipment, net $ 875 $ 1,478

Summary of Principal Accounti_3

Summary of Principal Accounting Policies (Principal Accounting Policies) (Details)	12 Months Ended
	Dec. 31, 2022
Refining and midstream assets | Minimum
Estimated useful lives (in years)	10 years
Refining and midstream assets | Maximum
Estimated useful lives (in years)	40 years
Office building
Estimated useful lives (in years)	25 years
Other miscellaneous fixed assets | Minimum
Estimated useful lives (in years)	4 years
Other miscellaneous fixed assets | Maximum
Estimated useful lives (in years)	7 years
MPC | MPLX
MPC's partnership interest in MLPs (in percentage)	65%

Short-term Investments (Investm

Short-term Investments (Investments Components) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 6,304	$ 7,228
Unrealized Gains	0	0
Unrealized Losses	(1)	(1)
Available-for-sale debt securities	6,303	7,227
Cash	5,467	3,612
Cash and short-term investments	11,770	10,839
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	3,158	1,679
Cash	5,467	3,612
Cash and short-term investments	8,625	5,291
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	3,145	5,548
Cash	0	0
Cash and short-term investments	3,145	5,548
Level 2 | Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,074	4,905
Unrealized Gains	0	0
Unrealized Losses	(1)	(1)
Available-for-sale debt securities	3,073	4,904
Level 2 | Commercial paper | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	1,106	868
Level 2 | Commercial paper | Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	1,967	4,036
Level 2 | Certificates of deposit and time deposits
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,093	2,024
Unrealized Gains	0	0
Unrealized Losses	0	0
Available-for-sale debt securities	2,093	2,024
Level 2 | Certificates of deposit and time deposits | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	1,500	750
Level 2 | Certificates of deposit and time deposits | Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	593	1,274
Level 2 | Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	66	271
Unrealized Gains	0	0
Unrealized Losses	0	0
Available-for-sale debt securities	66	271
Level 2 | Corporate notes and bonds | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	54	61
Level 2 | Corporate notes and bonds | Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	12	210
Level 1 | U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,071	28
Unrealized Gains	0	0
Unrealized Losses	0	0
Available-for-sale debt securities	1,071	28
Level 1 | U.S. government securities | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	498	0
Level 1 | U.S. government securities | Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	$ 573	$ 28

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
Gain on disposal of discontinued operation, net of tax , statement of income or comprehensive income [Extensible Enumeration]	Income from discontinued operations, net of tax

Discontinued Operations (Income

Discontinued Operations (Income from Discontinued Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues, other income and net gain on disposal of assets:
Net gain on disposal of assets	$ 1,061	$ 21	$ 70
Total revenues, other income and net gain on disposal of assets	179,952	120,930	69,032
Costs and expenses:
Cost of revenues (excludes items below)	151,671	110,008	65,733
Depreciation and amortization	3,215	3,364	3,375
Selling, general and administrative expenses	2,772	2,537	2,710
Other taxes	825	721	668
Total costs and expenses	158,483	116,630	81,279
Income from operations	21,469	4,300	(12,247)
Net interest and other financial costs	1,000	1,483	1,365
Income from discontinued operations, net of tax	72	8,448	1,205
Speedway
Revenues, other income and net gain on disposal of assets:
Revenues and other income	0	8,420	19,919
Net gain on disposal of assets	60	11,682	1
Total revenues, other income and net gain on disposal of assets	60	20,102	19,920
Costs and expenses:
Cost of revenues (excludes items below)	0	7,654	17,573
Depreciation and amortization	0	3	244
Selling, general and administrative expenses	0	121	323
Other taxes	0	75	193
Total costs and expenses	0	7,853	18,333
Income from operations	60	12,249	1,587
Net interest and other financial costs	0	6	20
Income before income taxes	60	12,243	1,567
Provision (benefit) for income taxes	(12)	3,795	362
Income from discontinued operations, net of tax	$ 72	$ 8,448	$ 1,205

Master Limited Partnership (Det

Master Limited Partnership (Details)	Dec. 31, 2022
MPC | MPLX
Noncontrolling Interest [Line Items]
MPC's partnership interest in MLPs (in percentage)	65%

Master Limited Partnership (Uni

Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 02, 2022	Nov. 02, 2020
Noncontrolling Interest [Line Items]
Stock repurchase plan remaining authorized amount	$ 3,330
Share Repurchase Authorization August 2022
Noncontrolling Interest [Line Items]
Stock repurchase program, authorized amount				$ 5,000
MPLX
Noncontrolling Interest [Line Items]
Stock repurchase program, authorized amount					$ 1,000
Stock repurchase plan remaining authorized amount	$ 846
Number of common units repurchased	15	23	1
Cash paid for common units repurchased	$ 491	$ 630	$ 33
MPLX | Share Repurchase Authorization August 2022
Noncontrolling Interest [Line Items]
Stock repurchase program, authorized amount				$ 1,000

Master Limited Partnership (U_2

Master Limited Partnership (Unit Repurchases) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Noncontrolling Interest [Line Items]
Average cost per share	$ 91.20	$ 62.65	$ 0
MPLX
Noncontrolling Interest [Line Items]
Number of common units repurchased	15	23	1
Cash paid for common units repurchased	$ 491	$ 630	$ 33
Average cost per share	$ 31.96	$ 27.52	$ 22.29

Master Limited Partnership (Red

Master Limited Partnership (Redemption of Business from MPLX) (Details) - MPLX $ in Millions	Jul. 31, 2020 USD ($) shares
Noncontrolling Interest [Line Items]
Partners' capital account, units, redeemed | shares	18,582,088
Partners' capital account, redemptions | $	$ 340

Master Limited Partnership (Ser

Master Limited Partnership (Series B Preferred Units) (Details) - Series B Preferred Stock - MPLX - $ / shares	Feb. 15, 2023	Dec. 31, 2022
Noncontrolling Interest [Line Items]
Preferred units, outstanding		600,000
Shares issued, price per share		$ 1,000
Subsequent Event
Noncontrolling Interest [Line Items]
Preferred stock, redemption price per share	$ 1,000

Master Limited Partnership (Non

Master Limited Partnership (Noncontrolling Interest) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Decrease in MPC's additional paid-in capital, net of tax	$ (447)	$ (554)	$ (46)
Additional Paid-in Capital
Decrease due to change in ownership	(164)	(166)	(27)
Tax impact	44	73	(14)
Decrease in MPC's additional paid-in capital, net of tax	$ (120)	$ (93)	$ (41)

Impairments (Details)

Impairments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Impairments	$ 0	$ 69	$ 9,741
Midstream
Finite-Lived Intangible Assets [Line Items]
Impairments		$ 69

Impairments (Income Statement L

Impairments (Income Statement Location of Impairments) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss	$ 7,330	$ 0	$ 0
Equity method investment, other than temporary impairment	$ 1,320
Impairments		0	69	$ 9,741
Impairment expense
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss		0	0	7,394
Impairment of long-lived assets held-for-use		$ 0	$ 0	$ 1,032
Impairment of long-lived asset held-for-use, statement of income or comprehensive income [Extensible Enumeration]		Impairment expense	Impairment expense	Impairment expense	[1]
Income (loss) from equity method investments
Finite-Lived Intangible Assets [Line Items]
Equity method investment, other than temporary impairment		$ 0	$ 13	$ 1,315
Depreciation and amortization
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived assets held-for-use		$ 0	$ 56	$ 0
Impairment of long-lived asset held-for-use, statement of income or comprehensive income [Extensible Enumeration]		Depreciation and amortization	Depreciation and amortization	Depreciation and amortization
[1]The amount of 2020 impairment expense not described in the narrative below is related to certain immaterial Midstream assets.

Impairments (Goodwill) (Details

Impairments (Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss		$ 7,330	$ 0	$ 0
Goodwill, Transfers			(12)
Discounted Cash Flow Approach | Discount Rate | Minimum
Finite-Lived Intangible Assets [Line Items]
Fair value inputs		9%
Discounted Cash Flow Approach | Discount Rate | Maximum
Finite-Lived Intangible Assets [Line Items]
Fair value inputs		13.50%
Refining & Marketing
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss	$ 64		0	$ 0
Goodwill, Transfers			$ 0
MPLX Wholesale Distribution Business
Finite-Lived Intangible Assets [Line Items]
Goodwill, Transfers	$ 64

Impairments (Equity Method Inve

Impairments (Equity Method Investments) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items]
Equity method investment, other than temporary impairment	$ 1,320
MPLX | MarkWest Utica EMG
Finite-Lived Intangible Assets [Line Items]
Equity method investment, other than temporary impairment	$ 1,250

Impairments (Long-Lived Assets)

Impairments (Long-Lived Assets) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020		Jun. 30, 2020
Impairment expense
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived asset held-for-use, statement of income or comprehensive income [Extensible Enumeration]				Impairment expense	Impairment expense	Impairment expense	[1]
Impairment of long-lived assets held-for-use				$ 0	$ 0	$ 1,032
Minimum
Finite-Lived Intangible Assets [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount								17%
Refining & Marketing
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived asset held-for-use, statement of income or comprehensive income [Extensible Enumeration]	Impairment expense	Impairment expense	Impairment expense
Impairment of long-lived assets held-for-use	$ 44	$ 342	$ 142
Midstream | MPLX
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived asset held-for-use, statement of income or comprehensive income [Extensible Enumeration]	Impairment expense	Impairment expense	Impairment expense
Impairment of long-lived assets held-for-use	$ 67	$ 27	$ 350
[1]The amount of 2020 impairment expense not described in the narrative below is related to certain immaterial Midstream assets.

Variable Interest Entities (Bal

Variable Interest Entities (Balance Sheet Information for Consolidated VIEs) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents		$ 8,625	$ 5,291
Receivables		13,477	11,034
Inventories		8,827	8,055
Other current assets		1,168	568
Equity method investments		6,466	5,409
Property, plant and equipment, net	[1]	35,657	37,440
Goodwill		8,244	8,256	$ 8,256
Right of use assets		1,214	1,372
Other noncurrent assets		3,081	2,400
Liabilities
Accounts payable		15,312	13,700
Payroll and benefits payable		967	911
Accrued taxes		1,140	1,231
Debt due within one year		1,066	571
Operating lease liabilities		368	438
Other current liabilities		1,167	1,047
Long-term debt		25,634	24,968
Deferred income taxes		5,904	5,638
Long-term operating lease liabilities		841	927
Deferred credits and other liabilities		1,304	1,346
VIE, Primary Beneficiary | MPLX
Assets
Cash and cash equivalents		238	13
Receivables		747	660
Inventories		148	142
Other current assets		56	55
Equity method investments		4,095	3,981
Property, plant and equipment, net		18,848	20,042
Goodwill		7,645	7,657
Right of use assets		283	268
Other noncurrent assets		1,664	891
Liabilities
Accounts payable		664	671
Payroll and benefits payable		4	6
Accrued taxes		67	75
Debt due within one year		988	499
Operating lease liabilities		46	59
Other current liabilities		338	304
Long-term debt		18,808	18,072
Deferred income taxes		13	10
Long-term operating lease liabilities		230	205
Deferred credits and other liabilities		$ 366	$ 559
[1]Includes finance leases. See Note 28.

Related Party Transactions (Rel

Related Party Transactions (Related Party Transactions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transactions [Abstract]
Sales to related parties	$ 144	$ 93	$ 123
Purchases from related parties	$ 1,175	$ 962	$ 738

Earnings per Share (Summary Of

Earnings per Share (Summary Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Income (loss) from continuing operations, net of tax	$ 15,978	$ 2,553	$ (11,182)
Net income attributable to noncontrolling interest	1,534	1,263	(151)
Net income allocated to participating securities	8	2	1
Income (loss) from continuing operations available to common stockholders	14,436	1,288	(11,032)
Income from discontinued operations, net of tax	72	8,448	1,205
Income (loss) available to common stockholders	$ 14,508	$ 9,736	$ (9,827)
Weighted average common shares outstanding:
Basic (in shares)	512	634	649
Effect of dilutive securities (in shares)	4	4	0
Diluted (in shares)	516	638	649
Basic:
Continuing operations	$ 28.17	$ 2.03	$ (16.99)
Discontinued operations	0.14	13.31	1.86
Net income (loss) per share	28.31	15.34	(15.13)
Diluted:
Continuing operations	27.98	2.02	(16.99)
Discontinued operations	0.14	13.22	1.86
Net income (loss) per share	$ 28.12	$ 15.24	$ (15.13)

Earnings per Share (Anti-diluti

Earnings per Share (Anti-dilutive Shares) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	3	11

Equity (Narrative) (Details)

Equity (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Aug. 02, 2022	Feb. 02, 2022
Equity, Class of Treasury Stock [Line Items]
Stock repurchase plan remaining authorized amount		$ 3,330
Number of shares repurchased		131,000,000	76,000,000	0
Cash paid for shares repurchased		$ 11,922	$ 4,654	$ 0
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased	830,000
Cash paid for shares repurchased	$ 96
Share Repurchase Authorization February 2022
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount						$ 5,000
Share Repurchase Authorization August 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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity [Abstract]
Number of shares repurchased	131	76	0
Cash paid for shares repurchased	$ 11,922	$ 4,654	$ 0
Average cost per share	$ 91.20	$ 62.65	$ 0

Segment Information (Narrative)

Segment Information (Narrative) (Details) - Segment	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Number of reportable segments	2
Segment Reporting, Disclosure of Major Customers	Since we will continue to supply fuel to Speedway subsequent to the sale to 7-Eleven, we have reported intersegment sales to Speedway, that were previously eliminated in consolidation, as third-party sales. All periods presented have been retrospectively adjusted through the sale date of May 14, 2021 to reflect this change. Sales to Speedway/7-Eleven from the Refining & Marketing segment represented 10 percent, 11 percent and 11 percent of our total annual revenues for the years ended December 31, 2022, 2021 and 2020, respectively.
Speedway | Customer Concentration Risk | Revenue Benchmark
Segment Reporting Information [Line Items]
Percent of annual revenues			11%
7-Eleven | Customer Concentration Risk | Revenue Benchmark
Segment Reporting Information [Line Items]
Percent of annual revenues	10%
Speedway/7-Eleven | Customer Concentration Risk | Revenue Benchmark
Segment Reporting Information [Line Items]
Percent of annual revenues		11%

Segment Information (Segment ad

Segment Information (Segment adjusted EBITDA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Segment Reporting Information [Line Items]
Refining planned turnaround costs	$ (1,122)		$ (582)		$ (832)
Storm impacts	0		(70)		0
LIFO inventory (charge) credit	148		0		(561)
Gain on sales of assets	1,058	[1]	0		66
Renewable volume obligation requirements(b)	238	[2]	0		0
Litigation	27		0		84
Impairments	0		(13)	[3]	(9,741)	[3]
Idling expenses	0		(12)		0
Restructuring expenses	0		0		(367)	[4]
Transaction related costs	0		0		(8)	[5]
Depreciation and amortization	(3,215)		(3,364)		(3,375)
Net interest and other financial costs	(1,000)		(1,483)		(1,365)
Income (loss) from continuing operations before income taxes	20,469		2,817		(13,612)
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	(25,033)		(8,928)		(3,122)
Operating Segments | Refining & Marketing
Segment Reporting Information [Line Items]
Adjusted EBITDA	(19,261)		(3,518)		1,939
Depreciation and amortization	(1,850)		(1,870)		(1,857)
Operating Segments | Midstream
Segment Reporting Information [Line Items]
Adjusted EBITDA	(5,772)		(5,410)		(5,061)
Depreciation and amortization	(1,310)		(1,329)		(1,353)
Corporate
Segment Reporting Information [Line Items]
Corporate	(698)		(587)		(635)
Depreciation and amortization	$ (55)		$ (165)	[6]	$ (165)
[1]2022 includes the non-cash gain related to the contribution of assets by MPC on the formation of the Martinez Renewables joint venture and the non-cash gain on lease reclassification. See Note 16 and 28 for additional information.[2]Represents retroactive changes in renewable volume obligation requirements published by the EPA in June 2022 for the 2020 and 2021 annual obligations.[3]2021 reflects impairments of equity method investments. 2020 reflects impairments of goodwill, equity method investments and long lived assets. See Note 7.[4]See Note 19.[5]2020 includes costs incurred in connection with the Midstream strategic review and other related efforts. Costs incurred in connection with the Speedway separation are included in discontinued operations. See Note 5[6]2021 includes an impairment of $ 56 million

Segment Information (Recon of S

Segment Information (Recon of Segment Revenues to Sales and Other Operating Revenues) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 177,453	$ 119,983	$ 69,779
Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	172,087	115,350	66,180
Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	5,366	4,633	3,599
Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues		5,342	5,130	4,906
Intersegment Eliminations | Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues		118	144	67
Intersegment Eliminations | Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		5,224	4,986	4,839
Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues		182,795	125,113	74,685
Operating Segments | Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues		172,205	115,494	66,247
Operating Segments | Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 10,590	$ 9,619	$ 8,438
[1]Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 5 and 9 for additional information.

Segment Information (Recon of O

Segment Information (Recon of Other Significant Items from Segments to Consolidated) (Details) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]
Income (loss) from equity method investments					$ 655	$ 458		$ (935)	[1]
Depreciation and amortization					3,215	3,364		3,375
Investments in equity method investments					405	210		485
Plus:
Total capital expenditures	[2]				$ 2,383	$ 1,605		$ 2,269
Depreciation and amortization
Plus:
Impairment of long-lived asset held-for-use, statement of income or comprehensive income [Extensible Enumeration]					Depreciation and amortization	Depreciation and amortization		Depreciation and amortization
Refining & Marketing
Plus:
Impairment of long-lived asset held-for-use, statement of income or comprehensive income [Extensible Enumeration]		Impairment expense	Impairment expense	Impairment expense
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Segment capital expenditures and investments					$ 2,577	$ 1,642		$ 2,568
Investments in equity method investments					405	210		485
Operating Segments | Refining & Marketing
Segment Reporting, Other Significant Reconciling Item [Line Items]
Income (loss) from equity method investments					31	59		2
Depreciation and amortization					1,850	1,870		1,857
Segment capital expenditures and investments					1,508	911		1,170
Operating Segments | Midstream
Segment Reporting, Other Significant Reconciling Item [Line Items]
Income (loss) from equity method investments					624	412		378
Depreciation and amortization					1,310	1,329		1,353
Segment capital expenditures and investments					1,069	731		1,398
Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Income (loss) from equity method investments					0	(13)	[3]	(1,315)	[3]
Depreciation and amortization					55	165	[4]	165
Plus:
Corporate					108	105		80
Capitalized interest					$ 103	$ 68		$ 106
[1]2020 includes impairment expense. See Note 7 for further information.[2]Includes changes in capital expenditure accruals. See Note 24 for a reconciliation of total capital expenditures to additions to property, plant and equipment as reported in the consolidated statements of cash flows[3]Impairment of equity method investment. See Note 7.[4]2021 includes an impairment of $ 56 million

Net Interest and Other Financ_3

Net Interest and Other Financial Costs (Net Interest and Other Financial Costs) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Income and Expenses [Abstract]
Interest income		$ (191)	$ (14)	$ (9)
Interest expense		1,299	1,340	1,462
Interest capitalized		(104)	(73)	(129)
Pension and other postretirement non-service costs	[1]	3	64	11
(Gain) loss on extinguishment of debt		2	133	(9)
Investments - net premium (discount) amortization		(30)	(1)	0
Other financial costs		21	34	39
Net interest and other financial costs		$ 1,000	$ 1,483	$ 1,365
[1]See Note 26.

Income Taxes (Components Of Inc

Income Taxes (Components Of Income Tax Provisions (Benefits)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 3,565	$ 380	$ (2,267)
State and local	629	48	69
Foreign	7	5	9
Total current	4,201	433	(2,189)
Deferred:
Federal	191	(164)	90
State and local	98	(6)	(347)
Foreign	1	1	16
Total deferred	290	(169)	(241)
Income tax provision (benefit)	$ 4,491	$ 264	$ (2,430)

Income Taxes (Reconciliation Of

Income Taxes (Reconciliation Of Federal Statutory Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal statutory rate	21%	21%	21%
State and local income taxes, net of federal income tax effects	3%	2%	2%
Goodwill impairment	0%	0%	(8.00%)
Noncontrolling interests	(2.00%)	(9.00%)	0%
Legislation	0%	(3.00%)	4%
Other	0%	(2.00%)	(1.00%)
Effective tax rate applied to income (loss) from continuing operations before income taxes	22%	9%	18%

Income Taxes (CARES Act) (Detai

Income Taxes (CARES Act) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Expense (Benefit)			$ (4,491)	$ (264)	$ 2,430
CARES Act
Income Tax Expense (Benefit)					$ 2,300
Proceeds from income tax refunds	$ 1,550
CARES Act | Subsequent Event
Proceeds from income tax refunds		$ 59
CARES Act | Accounts Payable and Accrued Liabilities
Income taxes receivable	$ 690			$ 690

Income Taxes (Components Of Def

Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Employee benefits	$ 481	$ 495
Environmental remediation	84	91
Finance lease obligations	371	339
Operating lease liabilities	224	263
Net operating loss carryforwards	44	122
Tax credit carryforwards	20	19
Goodwill and other intangibles	56	35
Other	44	58
Total deferred tax assets	1,324	1,422
Deferred tax liabilities:
Property, plant and equipment	2,656	2,716
Inventories	686	717
Investments in subsidiaries and affiliates	3,660	3,350
Right of use assets	223	257
Other	2	18
Total deferred tax liabilities	7,227	7,058
Net deferred tax liabilities	$ 5,903	$ 5,636

Income Taxes (Components Of Net

Income Taxes (Components Of Net Deferred Tax Liabilities Classified In Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Net deferred tax liabilities	$ 5,903	$ 5,636
Other noncurrent assets
Net deferred tax liabilities	1	2
Deferred income taxes
Net deferred tax liabilities	$ 5,904	$ 5,638

Income Taxes (Operating Loss Ca

Income Taxes (Operating Loss Carryforwards, Tax Credit Carryforwards and Valuation Allowances) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 49	$ 38
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	4	4
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss and tax credit carryforward	40	128
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 20	$ 9

Income Taxes (Summary Of Activi

Income Taxes (Summary Of Activity In Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 37	$ 23	$ 32
Additions for tax positions of current year	0	6	0
Additions for tax positions of prior years	38	19	12
Reductions for tax positions of prior years	(2)	(4)	(18)
Settlements, decrease	(15)	(6)	(3)
Statute of limitations	(1)	(1)	0
Unrecognized tax benefits, ending balance	57	37	23
Unrecognized tax benefits that would impact effective income tax rate	49
Uncertain tax positions, reasonably possible increase or decrease during the next twelve months	29
Unrecognized tax benefits income tax net penalties and interest expense (benefits)	1	(2)	$ (19)
Interest and penalties accrued	$ 4	$ 6

Inventories (Summary Of Invento

Inventories (Summary Of Inventories) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Crude oil	$ 3,047	$ 2,639
Refined products	4,748	4,460
Materials and supplies	1,032	956
Total	$ 8,827	$ 8,055

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Total inventory LIFO percentage	88%	88%
Excess of current acquisition costs over stated LIFO value	$ 3,720	$ 2,840

Equity Method Investments (Crow

Equity Method Investments (Crowley Ocean Partners) (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 01, 2022	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Payments to acquire businesses, net of cash acquired		$ 413		$ 0	$ 0
Book value of equity method investment		150	[1]	0	0
Net gain on disposal of assets		$ 1,061		$ 21	$ 70
Crowley Coastal Partners, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		50%
Crowley Ocean Partners
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage	50%
Payments to acquire businesses, net of cash acquired	$ 485
Repayments of Other Debt	196
Fair value of assets contributed	144
Book value of equity method investment	125
Net gain on disposal of assets	$ 19
[1]Represents the book value of MPC’s equity method investment in Watson Cogeneration Company and Crowley Ocean Partners prior to MPC buying out the remaining interest in these entities. See Note 16 for additional information

Equity Method Investments (Mart

Equity Method Investments (Martinez Renewables LLC) (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 21, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
Net gain on disposal of assets		$ 1,061	$ 21	$ 70
Proceeds from equity method investment, distribution, return of capital		515	39	$ 137
Equity method investments		$ 6,466	$ 5,409
Martinez Renewables LLC
Schedule of Equity Method Investments [Line Items]
Fair value of assets contributed	$ 1,470
Net gain on disposal of assets	549
Proceeds from equity method investment, distribution, return of capital	500
Equity method investments					$ 971
Martinez Renewables LLC | Neste
Schedule of Equity Method Investments [Line Items]
Payments to acquire interest in joint venture	$ 728

Equity Method Investments (Wats

Equity Method Investments (Watson Cogeneration Company) (Details) $ in Millions		12 Months Ended
	Jun. 01, 2022 USD ($)	Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Payments to acquire businesses, net of cash acquired		$ 413		$ 0	$ 0
Book value of equity method investment		150	[1]	0	0
Net gain on disposal of assets		$ 1,061		$ 21	$ 70
Watson Cogeneration Company
Schedule of Equity Method Investments [Line Items]
Equity method investment, remaining ownership interest purchased	0.49
Payments to acquire businesses, net of cash acquired	$ 59
Fair value of assets contributed	62
Book value of equity method investment	$ 25
Equity method investments, 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 and Crowley Ocean Partners prior to MPC buying out the remaining interest in these entities. See Note 16 for additional information

Equity Method Investments (Sche

Equity Method Investments (Schedule Of Equity Method Investments) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Sep. 30, 2022	Jun. 01, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 6,466			$ 5,409
Martinez Renewables LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments			$ 971
Watson Cogeneration Company
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage				51%
Crowley Coastal Partners, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		50%
Refining & Marketing
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 1,328			241
Refining & Marketing | The Andersons Marathon Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		50%
Equity method investments		$ 204			194
Refining & Marketing | Martinez Renewables LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		50%
Equity method investments		$ 1,070			0
Refining & Marketing | Watson Cogeneration Company
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		0%
Equity method investments		$ 0			28
Refining & Marketing | Other equity method investees
Schedule of Equity Method Investments [Line Items]
Equity method investments		54			19
Midstream
Schedule of Equity Method Investments [Line Items]
Equity method investments		5,138			5,168
Midstream | MPLX
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 4,095			3,981
Midstream | MPLX | Andeavor Logistics Rio Pipeline
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		67%
Equity method investments		$ 177			183
Midstream | MPLX | Centrahoma Processing LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		40%
Equity method investments		$ 131			133
Midstream | MPLX | Illinois Extension Pipeline
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		35%
Equity method investments		$ 236			243
Midstream | MPLX | LOOP
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		41%
Equity method investments		$ 287			265
Midstream | MPLX | MarEn Bakken Company LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		25%
Equity method investments		$ 475			449
Midstream | MPLX | MarkWest EMG Jefferson Dry Gas
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		67%
Equity method investments		$ 335			332
Midstream | MPLX | Markwest Tornado GP, L.L.C.
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		60%
Equity method investments		$ 306			246
Midstream | MPLX | MarkWest Utica EMG
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		57%
Equity method investments		$ 669			680
Midstream | MPLX | Minnesota Pipe Line Company, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		17%
Equity method investments		$ 178			183
Midstream | MPLX | Rendezvous Gas Services, L.L.C.
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		78%
Equity method investments		$ 137			147
Midstream | MPLX | Sherwood Midstream Holdings
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		51%
Equity method investments		$ 125			136
Midstream | MPLX | Sherwood Midstream
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		50%
Equity method investments		$ 512			544
Midstream | MPLX | Whistler Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		38%
Equity method investments		$ 211			155
Midstream | MPLX | Other equity method investees
Schedule of Equity Method Investments [Line Items]
Equity method investments	[1]	316			285
Midstream | Marathon Petroleum Corporation
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 1,043			1,187
Midstream | Marathon Petroleum Corporation | LOOP
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		10%
Equity method investments		$ 71			66
Midstream | Marathon Petroleum Corporation | Capline LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		33%
Equity method investments		$ 404			399
Midstream | Marathon Petroleum Corporation | Crowley Coastal Partners, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		50%
Equity method investments		$ 55			185
Midstream | Marathon Petroleum Corporation | Gray Oak Pipeline LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		25%
Equity method investments		$ 302			318
Midstream | Marathon Petroleum Corporation | South Texas Gateway Terminal LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments, ownership percentage		25%
Equity method investments		$ 170			173
Midstream | Marathon Petroleum Corporation | Other equity method investees
Schedule of Equity Method Investments [Line Items]
Equity method investments	[1]	$ 41			$ 46
[1]Some investments included within “Other” have been deemed to be VIEs

Equity Method Investments (Summ

Equity Method Investments (Summarized Financial Information For Equity Method Investees) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income statement data:
Revenues and other income	$ 179,952	$ 120,930	$ 69,032
Income from operations	21,469	4,300	(12,247)
Net income	16,050	11,001	(9,977)
Balance sheet data – December 31:
Current assets	35,242	30,496
Current liabilities	20,020	17,898
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Income statement data:
Revenues and other income	5,069	4,343	3,013
Income from operations	1,907	1,389	599
Net income	1,740	1,230	$ 454
Balance sheet data – December 31:
Current assets	1,811	1,233
Noncurrent assets	20,324	18,071
Current liabilities	1,478	801
Noncurrent liabilities	$ 4,750	$ 5,141

Equity Method Investments (Basi

Equity Method Investments (Basis differences and distributions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity method investment difference between carrying amount and underlying equity	$ 304
Equity method investment difference between carrying amount and underlying equity portion related to goodwill and other assets not amortized	208
Distributions from equity method investments	$ 772	$ 652	$ 577

Property, Plant and Equipment_2

Property, Plant and Equipment (Summary Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross PP&E	[1]	$ 61,501	$ 60,633
Accumulated depreciation	[1]	25,844	23,193
Property, plant and equipment, net	[1]	35,657	37,440
Operating Segments | Refining & Marketing
Property, Plant and Equipment [Line Items]
Gross PP&E		32,292	31,089
Accumulated depreciation		16,745	14,876
Property, plant and equipment, net		15,547	16,213
Operating Segments | Midstream
Property, Plant and Equipment [Line Items]
Gross PP&E		27,659	28,098
Accumulated depreciation		8,118	7,384
Property, plant and equipment, net		19,541	20,714
Corporate
Property, Plant and Equipment [Line Items]
Gross PP&E		1,550	1,446
Accumulated depreciation		981	933
Property, plant and equipment, net		$ 569	$ 513
[1]Includes finance leases. See Note 28.

Property, Plant and Equipment_3

Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross PP&E	[1]	$ 61,501	$ 60,633
Construction in progress
Property, Plant and Equipment [Line Items]
Gross PP&E		$ 2,290	$ 2,270
[1]Includes finance leases. See Note 28.

Goodwill and Intangibles (Chang

Goodwill and Intangibles (Changes In Carrying Amount Of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Beginning balance			$ 8,256	$ 8,256
Goodwill, Transfers			(12)
Impairments		$ (7,330)	0	0
Ending balance			8,244	8,256
Refining & Marketing
Goodwill [Line Items]
Beginning balance			561	561
Goodwill, Transfers			0
Impairments	$ (64)		0	0
Ending balance			561	561
Midstream
Goodwill [Line Items]
Beginning balance			7,695	7,695
Goodwill, Transfers			(12)
Impairments			0	0
Ending balance			$ 7,683	$ 7,695

Goodwill and Intangibles (Accum

Goodwill and Intangibles (Accumulated Impairment Losses) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Gross goodwill	$ 16,965
Accumulated impairment losses	(8,721)
Goodwill	8,244	$ 8,256	$ 8,256
Refining & Marketing
Goodwill [Line Items]
Gross goodwill	6,141
Accumulated impairment losses	(5,580)
Goodwill	561	561	561
Midstream
Goodwill [Line Items]
Gross goodwill	10,824
Accumulated impairment losses	(3,141)
Goodwill	$ 7,683	$ 7,695	$ 7,695

Goodwill and Intangibles (Intan

Goodwill and Intangibles (Intangible Assets by Major Class) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	$ 3,898	$ 3,766
Accumulated amortization	2,022	1,631
Net	1,876	2,135
Customer contracts and relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	3,624	3,495
Accumulated amortization	1,825	1,457
Net	1,799	2,038
Brand rights and tradenames
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	100	100
Accumulated amortization	64	50
Net	36	50
Royalty agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	138	135
Accumulated amortization	103	96
Net	35	39
Other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	36	36
Accumulated amortization	30	28
Net	$ 6	$ 8

Goodwill and Intangibles (Int_2

Goodwill and Intangibles (Intangibles Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Indefinite-lived intangible assets	$ 71	$ 71
Amortization expense	$ 316	$ 330

Goodwill and Intangibles (Estim

Goodwill and Intangibles (Estimated Future Amortization Expense) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2023	$ 315
2024	257
2025	241
2026	221
2027	$ 193

Restructuring (Details)

Restructuring (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) People		Sep. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 0	$ 0	$ 367	[1]
Restructuring reserve to be settled in cash	46	59	$ 141		$ 291	[2]
Number of positions eliminated | People			2,050
Exit and disposal costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			$ 195
Restructuring reserve to be settled in cash	46	59	103		133
Restructuring reserve, settled without cash			51
Exit and disposal costs | Decommissioning refinery processing units and storage tanks and environmental remediation obligations
Restructuring Cost and Reserve [Line Items]
Restructuring reserve to be settled in cash			130
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			172
Restructuring reserve to be settled in cash	$ 0	$ 0	38		$ 158
Employee separation costs | MPLX
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			$ 37
[1]See Note 19.[2]The restructuring reserve was zero until the third quarter of 2020.

Restructuring Reserve (Details)

Restructuring Reserve (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2020		Dec. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 291	[1]	$ 59	$ 141
Adjustments	19
Cash payments	(169)		(13)	(82)
Restructuring reserve, ending balance	141		46	59
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	158		0	38
Adjustments	14
Cash payments	(134)		0	(38)
Restructuring reserve, ending balance	38		0	0
Exit and disposal costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	133		59	103
Adjustments	5
Cash payments	(35)		(13)	(44)
Restructuring reserve, ending balance	$ 103		$ 46	$ 59
[1]The restructuring reserve was zero until the third quarter of 2020.

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Accounted For At Fair Value On Recurring Basis) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash collateral netted with derivative liabilities		$ 58	$ 14
Fair Value, Measurements, Recurring | Commodity derivative instruments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - collateral and netting	[1]	(243)	(235)
Commodity derivative instruments, assets - collateral pledged not offset		100	34
Commodity derivative instruments, liabilities - netting and collateral	[1]	(301)	(249)
Commodity derivative instruments, liabilities - collateral pledged not offset		0	0
Derivative Asset, Subject to Master Netting Arrangement, after Offset	[2]	67	36
Derivative Liability, Subject to Master Netting Arrangement, after Offset	[2]	0	0
Fair Value, Measurements, Recurring | Commodity derivative instruments | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - gross		310	270
Commodity derivative instruments, liabilities - gross		301	248
Fair Value, Measurements, Recurring | Commodity derivative instruments | Level 2
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 | Commodity derivative instruments | Level 3
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 | Embedded derivative in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - netting and collateral		0	0
Commodity derivative instruments, liabilities - collateral pledged not offset		0	0
Derivative Liability, Subject to Master Netting Arrangement, after Offset		61	108
Fair Value, Measurements, Recurring | Embedded derivative in commodity contracts | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring | Embedded derivative in commodity contracts | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring | Embedded derivative in commodity contracts | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		$ 61	$ 108
[1]Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of December 31, 2022, cash collateral of $58 million was netted with mark-to-market 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 which are subject to master netting arrangements reflected gross on the balance sheet.

Fair Value Measurements (Recurr

Fair Value Measurements (Recurring Narrative) (Details) - Level 3	12 Months Ended
	Dec. 31, 2022 $ / gal USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, average forward price | $ / gal	0.84
Probability of renewal second term	100%
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, forward price	0.68
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, forward price	1.62

Fair Value Measurements (Reconc

Fair Value Measurements (Reconciliation Of Net Beginning And Ending Balances Recorded For Net Assets And Liabilities Classified As Level 3) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Beginning balance	$ 108	$ 63
Unrealized and realized (gain)/loss included in net income	$ (35)	$ 59
Unrealized and realized (gain)/loss included in net income	Cost of revenues (excludes items below)	Cost of revenues (excludes items below)
Settlements of derivative instruments	$ (12)	$ (14)
Ending balance	$ 61	$ 108

Fair Value Measurements (Gains_

Fair Value Measurements (Gains/Losses Included In Earnings Relating to Assets Still Held at the End of Period) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
The amount of total (gain)/ loss for the period included in earnings attributable to the change in unrealized (gain)/loss relating to liabilities still held at the end of period:	$ (33)	$ 47
The amount of total (gain)/loss for the period included in earnings attributable to the change in unrealized (gain)/loss, statement of income or comprehensive income [Extensible Enumeration]	Cost of revenues (excludes items below)	Cost of revenues (excludes items below)

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Values - Reported) (Details) - USD ($) $ in Billions	Dec. 31, 2022	Dec. 31, 2021
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 26.3	$ 25.1
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 24	$ 28.1

Derivatives (Classification Of

Derivatives (Classification Of Gross Fair Values Of Derivative Instruments, Excluding Cash Collateral) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Commodity derivative instruments | Other current assets
Derivatives, Fair Value [Line Items]
Asset		$ 310	$ 271
Liability		301	249
Embedded derivative in commodity contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Asset		0	0
Liability	[1]	10	15
Embedded derivative in commodity contracts | Deferred credits and other liabilities
Derivatives, Fair Value [Line Items]
Asset		0	0
Liability	[1]	$ 51	$ 93
[1]Includes embedded derivatives.

Derivatives (Open Commodity Der

Derivatives (Open Commodity Derivative Contracts) (Details) - Exchange Traded bbl in Thousands	12 Months Ended
	Dec. 31, 2022 bbl
Crude oil
Derivative [Line Items]
Percentage of derivative contracts expiring next quarter	65.10%
Crude oil | Long
Derivative [Line Items]
Notional contracts (contract volumes)	69,275	[1]
Crude oil | Long | Spread contracts
Derivative [Line Items]
Notional contracts (contract volumes)	29,651
Crude oil | Short
Derivative [Line Items]
Notional contracts (contract volumes)	82,639	[1]
Crude oil | Short | Spread contracts
Derivative [Line Items]
Notional contracts (contract volumes)	29,876
Refined products
Derivative [Line Items]
Percentage of derivative contracts expiring next quarter	76.60%
Refined products | Long
Derivative [Line Items]
Notional contracts (contract volumes)	16,669	[1]
Refined products | Long | Spread contracts
Derivative [Line Items]
Notional contracts (contract volumes)	1,390
Refined products | Short
Derivative [Line Items]
Notional contracts (contract volumes)	9,226	[1]
Refined products | Short | Spread contracts
Derivative [Line Items]
Notional contracts (contract volumes)	25
Blending products
Derivative [Line Items]
Percentage of derivative contracts expiring next quarter	98.80%
Blending products | Long
Derivative [Line Items]
Notional contracts (contract volumes)	1,443	[1]
Blending products | Short
Derivative [Line Items]
Notional contracts (contract volumes)	4,885	[1]
Soybean oil
Derivative [Line Items]
Percentage of derivative contracts expiring next quarter	53.50%
Soybean oil | Long
Derivative [Line Items]
Notional contracts (contract volumes)	2,103
Soybean oil | Short
Derivative [Line Items]
Notional contracts (contract volumes)	2,623
[1]Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 29,651 long and 29,876 short; Refined products - 1,390 long and 25 short. There are no spread contracts for blending products or soybean oil.

Derivatives (Effect Of Commodit

Derivatives (Effect Of Commodity Derivative Instruments In Statements Of Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Gain (Loss)	$ (58)	$ (380)	$ 107
Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenues (excludes items below), Other income, Sales and other operating revenues	Cost of revenues (excludes items below), Other income, Sales and other operating revenues	Cost of revenues (excludes items below), Other income, Sales and other operating revenues
Sales and other operating revenues
Derivative [Line Items]
Gain (Loss)	$ 0	$ (47)	$ 72
Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Sales and other operating revenues	Sales and other operating revenues	Sales and other operating revenues
Cost of revenues
Derivative [Line Items]
Gain (Loss)	$ (58)	$ (333)	$ 34
Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenues (excludes items below)	Cost of revenues (excludes items below)	Cost of revenues (excludes items below)
Other income
Derivative [Line Items]
Gain (Loss)	$ 0	$ 0	$ 1
Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income	Other income	Other income

Debt (Outstanding Borrowings) (

Debt (Outstanding Borrowings) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total finance lease liabilities	$ 530	$ 598
Total debt	27,080	25,948
Unamortized debt issuance costs	(142)	(129)
Unamortized discount, net of unamortized premium	(238)	(280)
Amounts due within one year	(1,066)	(571)
Total long-term debt due after one year	25,634	24,968
Marathon Petroleum Corporation
Debt Instrument [Line Items]
Notes payable	1	1
Total debt	6,972	7,039
Marathon Petroleum Corporation | Senior Notes
Debt Instrument [Line Items]
Long-term debt outstanding	6,449	6,449
Marathon Petroleum Corporation | Finance Lease
Debt Instrument [Line Items]
Total finance lease liabilities	522	589
MPLX
Debt Instrument [Line Items]
Bank revolving credit facility	0	300
Total debt	20,108	18,909
MPLX | Senior Notes
Debt Instrument [Line Items]
Long-term debt outstanding	20,100	18,600
MPLX | Finance Lease
Debt Instrument [Line Items]
Total finance lease liabilities	$ 8	$ 9

Debt (Commercial Paper) (Detail

Debt (Commercial Paper) (Details) - Commercial paper $ in Billions	Feb. 26, 2016 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2
Debt instrument, term	397 days

Debt (MPC Senior Notes) (Detail

Debt (MPC Senior Notes) (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Dec. 02, 2021	Mar. 01, 2021	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Gain (Loss) on extinguishment of debt				$ (2)	$ (133)	$ 9
Marathon Petroleum Corporation | Senior Notes
Debt Instrument [Line Items]
Long-term debt outstanding				6,449	6,449
Gain (loss) on extinguishment of debt, before write off of debt issuance cost					132
Write off of deferred debt issuance cost					6
Gain (Loss) on extinguishment of debt					126
Marathon Petroleum Corporation | Senior Notes | Senior notes, 3.625% due September 2024
Debt Instrument [Line Items]
Long-term debt outstanding				750	750
Marathon Petroleum Corporation | Senior Notes | Senior notes, 4.700% due May 2025
Debt Instrument [Line Items]
Long-term debt outstanding				1,250	1,250
Marathon Petroleum Corporation | Senior Notes | Senior notes, 5.125% due December 2026
Debt Instrument [Line Items]
Long-term debt outstanding				719	719
Marathon Petroleum Corporation | Senior Notes | Senior notes, 3.800% due April 2028
Debt Instrument [Line Items]
Long-term debt outstanding				496	496
Marathon Petroleum Corporation | Senior Notes | Senior notes, 6.500% due March 2041
Debt Instrument [Line Items]
Long-term debt outstanding				1,250	1,250
Marathon Petroleum Corporation | Senior Notes | Senior notes, 4.750% due September 2044
Debt Instrument [Line Items]
Long-term debt outstanding				800	800
Marathon Petroleum Corporation | Senior Notes | Senior notes, 5.850% due December 2045
Debt Instrument [Line Items]
Long-term debt outstanding				250	250
Marathon Petroleum Corporation | Senior Notes | Senior notes, 4.500% due April 2048
Debt Instrument [Line Items]
Long-term debt outstanding				498	498
Marathon Petroleum Corporation | Senior Notes | Senior notes, 5.000%, due September 2054
Debt Instrument [Line Items]
Long-term debt outstanding				400	400
Marathon Petroleum Corporation | Senior Notes | Senior notes due March 2021
Debt Instrument [Line Items]
Repayments of debt		$ 1,000
Marathon Petroleum Corporation | Senior Notes | Senior notes due April 2024
Debt Instrument [Line Items]
Repayments of debt			$ 300
Marathon Petroleum Corporation | Senior Notes | Senior notes due May 2023
Debt Instrument [Line Items]
Repayments of debt	$ 1,250
Marathon Petroleum Corporation | Senior Notes | Senior notes due December 2023
Debt Instrument [Line Items]
Repayments of debt	$ 850
Marathon Petroleum Corporation | Senior Notes | Andeavor | Andeavor senior notes, 3.800% - 5.125% due 2026 – 2048
Debt Instrument [Line Items]
Long-term debt outstanding				$ 36	$ 36

Debt (MPLX Senior Notes) (Detai

Debt (MPLX Senior Notes) (Details) - MPLX - Senior Notes - USD ($) $ in Millions			3 Months Ended
	Sep. 03, 2021	Jan. 15, 2021	Sep. 30, 2022	Dec. 31, 2022	Aug. 11, 2022	Mar. 14, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt outstanding				$ 20,100			$ 18,600
Senior notes, 3.500% due December 2022
Debt Instrument [Line Items]
Long-term debt outstanding				0			486
Repayments of debt			$ 500
Senior notes, 3.500% due December 2022 | ANDX
Debt Instrument [Line Items]
Repayments of debt			14
Senior notes, 3.375% due March 2023
Debt Instrument [Line Items]
Long-term debt outstanding				0			500
Repayments of debt			$ 500
Senior notes, 4.500% due July 2023
Debt Instrument [Line Items]
Long-term debt outstanding				989			989
Senior notes, 4.875% due December 2024
Debt Instrument [Line Items]
Long-term debt outstanding				1,149			1,149
Senior notes, 4.000% due February 2025
Debt Instrument [Line Items]
Long-term debt outstanding				500			500
Senior notes, 4.875% due June 2025
Debt Instrument [Line Items]
Long-term debt outstanding				1,189			1,189
Senior notes, 1.750% due March 2026
Debt Instrument [Line Items]
Long-term debt outstanding				1,500			1,500
Senior notes, 4.125% due March 2027
Debt Instrument [Line Items]
Long-term debt outstanding				1,250			1,250
Senior notes, 4.250% due December 2027
Debt Instrument [Line Items]
Long-term debt outstanding				732			732
Senior notes, 4.000% due March 2028
Debt Instrument [Line Items]
Long-term debt outstanding				1,250			1,250
Senior notes, 4.800% due February 2029
Debt Instrument [Line Items]
Long-term debt outstanding				750			750
Senior notes, 2.650% due August 2030
Debt Instrument [Line Items]
Long-term debt outstanding				1,500			1,500
Senior notes, 4.950% due September 2032
Debt Instrument [Line Items]
Long-term debt outstanding				1,000			0
Debt instrument, face amount					$ 1,000
Senior notes, 4.500% due April 2038
Debt Instrument [Line Items]
Long-term debt outstanding				1,750			1,750
Senior notes, 5.200% due March 2047
Debt Instrument [Line Items]
Long-term debt outstanding				1,000			1,000
Senior notes, 5.200% due December 2047
Debt Instrument [Line Items]
Long-term debt outstanding				487			487
Senior notes, 4.700% due April 2048
Debt Instrument [Line Items]
Long-term debt outstanding				1,500			1,500
Senior notes, 5.500% due February 2049
Debt Instrument [Line Items]
Long-term debt outstanding				1,500			1,500
Senior notes, 4.950% due March 2052
Debt Instrument [Line Items]
Long-term debt outstanding				1,500			0
Debt instrument, face amount						$ 1,500
Senior notes, 4.900% due April 2058
Debt Instrument [Line Items]
Long-term debt outstanding				500			500
Senior notes, 5.250% due January 2025
Debt Instrument [Line Items]
Repayments of debt		$ 750
Floating rate senior notes due September 2022
Debt Instrument [Line Items]
Repayments of debt	$ 1,000
MarkWest | MarkWest senior notes, 4.500% - 5.500% due 2023 - 2025
Debt Instrument [Line Items]
Long-term debt outstanding				23			23
ANDX | ANDX senior notes, 3.500% - 6.375% due 2019 - 2047
Debt Instrument [Line Items]
Long-term debt outstanding				$ 31			$ 45

Debt (Schedule Of Debt Payments

Debt (Schedule Of Debt Payments) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Debt Disclosure [Abstract]
2023	$ 1,000
2024	1,901
2025	2,950
2026	2,249
2027	$ 2,000

Debt (Available Capacity under

Debt (Available Capacity under our Facilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Jul. 31, 2022	Jul. 07, 2022	Dec. 31, 2021
MPLX
Line of Credit Facility [Line Items]
Outstanding Borrowings	$ 0			$ 300
MPC bank revolving credit facility due July 2027
Line of Credit Facility [Line Items]
Total Capacity	5,000
Outstanding Borrowings	0
Outstanding Letters of Credit	1
Available Capacity	$ 4,999
Weighted Average Interest Rate	0%
Trade Receivables Securitization due September 2023
Line of Credit Facility [Line Items]
Total Capacity	$ 100
Outstanding Borrowings	0
Outstanding Letters of Credit	100
Available Capacity	$ 0
Weighted Average Interest Rate	0%
Line of credit facility, maximum borrowing capacity		$ 100
MPLX revolving credit facility due July 2027 | MPLX
Line of Credit Facility [Line Items]
Total Capacity	$ 2,000
Outstanding Borrowings	0
Outstanding Letters of Credit	0
Available Capacity	$ 2,000
Weighted Average Interest Rate	0%
Line of credit facility, maximum borrowing capacity			$ 2,000
Trade Receivables Securitization due September 2023
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100
Trade Receivables Securitization due September 2023 | Purchase crude oil from Strategic Petroleum Reserve
Line of Credit Facility [Line Items]
Outstanding Letters of Credit	$ 1,050

Debt (MPC Bank Revolving Credit

Debt (MPC Bank Revolving Credit Facility) (Details) $ in Millions	Jul. 07, 2022 USD ($) Period	Dec. 31, 2022 USD ($)
MPC revolving credit facility due October 2023
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000
MPC bank revolving credit facility due July 2027
Line of Credit Facility [Line Items]
Total capacity		$ 5,000
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000
Number of renewal periods | Period	2
Debt instrument, description of variable rate basis	at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the MPC Credit Agreement, plus an applicable margin
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027 | Letter of Credit
Line of Credit Facility [Line Items]
Total capacity	$ 2,200
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027 | Maximum
Line of Credit Facility [Line Items]
Line of credit facility additional borrowing capacity	$ 1,000
Ratio of indebtedness to net capital	0.65
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027 | Maximum | Bridge Loan
Line of Credit Facility [Line Items]
Total capacity	$ 250
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027 | Maximum | Letter of Credit
Line of Credit Facility [Line Items]
Total capacity	$ 3,000

Debt (Trade Receivables Securit

Debt (Trade Receivables Securitization Facility) (Details) - Trade Receivables Securitization due September 2023 $ in Millions	Jul. 31, 2022 USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100
Line of credit facility additional borrowing capacity	$ 400

Debt (MPLX Bank Revolving Credi

Debt (MPLX Bank Revolving Credit Facility) (Details) $ in Millions	Jul. 07, 2022 USD ($) Period	Dec. 31, 2022 USD ($)
MPC bank revolving credit facility due July 2027
Debt Instrument [Line Items]
Total capacity		$ 5,000
MPLX | MPLX revolving credit facility due July 2024
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 3,500
MPLX | MPLX revolving credit facility due July 2027
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,000
Total capacity		$ 2,000
Debt instrument, description of variable rate basis	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
Number of renewal periods | Period	2
MPLX | MPLX revolving credit facility due July 2027 | Maximum
Debt Instrument [Line Items]
Line of credit facility additional borrowing capacity	$ 1,000
Number of prior quarterly reporting periods covenant	4
Covenant ratio debt to EBITDA	5
Covenant ratio debt to EBITDA post acquisition	5.5
MPLX | MPLX revolving credit facility due July 2027 | Letter of Credit | Maximum
Debt Instrument [Line Items]
Total capacity	$ 150
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 5,000
Debt instrument, description of variable rate basis	at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the MPC Credit Agreement, plus an applicable margin
Number of renewal periods | Period	2
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027 | Maximum
Debt Instrument [Line Items]
Line of credit facility additional borrowing capacity	$ 1,000
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027 | Letter of Credit
Debt Instrument [Line Items]
Total capacity	2,200
Marathon Petroleum Corporation | MPC bank revolving credit facility due July 2027 | Letter of Credit | Maximum
Debt Instrument [Line Items]
Total capacity	$ 3,000

Revenue (Disaggregated by Segme

Revenue (Disaggregated by Segment and Product Line) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Sales and other operating revenues		$ 177,453		$ 119,983	$ 69,779
Refining & Marketing
Sales and other operating revenues	[1]	172,087		115,350	66,180
Refining & Marketing | Refined products
Sales and other operating revenues		161,362		107,345	61,648
Refining & Marketing | Crude oil
Sales and other operating revenues		8,962		7,132	4,023
Refining & Marketing | Services and other
Sales and other operating revenues		1,763		873	509
Midstream
Sales and other operating revenues	[1]	5,366		4,633	3,599
Midstream | Refined products
Sales and other operating revenues		2,219		1,590	641
Midstream | Services and other
Sales and other operating revenues		$ 3,147	[2]	$ 3,043	$ 2,958
[1]Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 5 and 9 for additional information.[2]Includes sales-type lease revenue. See Note 28.

Revenue (Receivables) (Details)

Revenue (Receivables) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Revenue from Contract with Customer [Abstract]
Matching buy/sell receivables	$ 6,250

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information (Summary Of Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$ 1,060		$ 1,231	$ 1,235
Net income taxes paid to taxing authorities	4,869		2,436	(179)
Payments on operating leases	498		569	651
Interest payments under finance lease obligations	24		21	25
Net cash provided by financing activities included:
Principal payments under finance lease obligations	79		71	66
Non-cash investing and financing activities:
Right of use assets obtained in exchange for new operating lease obligations	367		349	343
Right of use assets obtained in exchange for new finance lease obligations	60		37	110
Contribution of net assets	818	[1]	0	0
Book value of equity method investment	$ 150	[2]	$ 0	$ 0
[1]Represents the book value of property, plant and equipment, inventory and working capital contributed by MPC to Martinez Renewables LLC. See Note 16 for additional information.[2]Represents the book value of MPC’s equity method investment in Watson Cogeneration Company and Crowley Ocean Partners prior to MPC buying out the remaining interest in these entities. See Note 16 for additional information

Supplemental Cash Flow Inform_4

Supplemental Cash Flow Information (Reconciliation Of Additions To Property, Plant And Equipment To Total Capital Expenditures) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]
Additions to property, plant and equipment per the consolidated statements of cash flows		$ 2,420	$ 1,464	$ 2,787
Increase (decrease) in capital accruals		(37)	141	(518)
Total capital expenditures	[1]	$ 2,383	$ 1,605	$ 2,269
[1]Includes changes in capital expenditure accruals. See Note 24 for a reconciliation of total capital expenditures to additions to property, plant and equipment 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) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ (67)	$ (512)
Other comprehensive income (loss) before reclassifications, net of tax		58	386
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service cost (credit)		(67)	(43)
Amortization of actuarial loss		10	47
Settlement loss		79	76
Other			(1)
Tax effect		(11)	(20)
Other comprehensive income (loss)		69	445	$ (192)
Ending balance		2	(67)	(512)
Other comprehensive income (loss) before reclassifications, tax		11	127
Pension Benefits
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service cost (credit)		(45)	(45)	(45)
Other Benefits
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service cost (credit)		(22)	2	0
Accumulated Defined Benefit Plans Adjustment | Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(117)	(338)
Other comprehensive income (loss) before reclassifications, net of tax		(70)	171
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service cost (credit)	[1]	(45)	(45)
Amortization of actuarial loss	[1]	4	37
Settlement loss	[1]	79	75
Tax effect		(14)	(17)
Other comprehensive income (loss)		(46)	221
Ending balance		(163)	(117)	(338)
Accumulated Defined Benefit Plans Adjustment | Other Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		49	(181)
Other comprehensive income (loss) before reclassifications, net of tax		129	220
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service cost (credit)	[1]	(22)	2
Amortization of actuarial loss	[1]	6	10
Settlement loss	[1]	0	1
Tax effect		3	(3)
Other comprehensive income (loss)		116	230
Ending balance		165	49	(181)
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		1	7
Other comprehensive income (loss) before reclassifications, net of tax		(1)	(5)
Amounts reclassified from accumulated other comprehensive loss:
Other			(1)
Tax effect		0	0
Other comprehensive income (loss)		(1)	(6)	(1)
Ending balance		$ 0	$ 1	$ 7
[1]These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 26.

Pension and Other Postretirem_3

Pension and Other Postretirement Benefits (Cash Balance Pension Plan) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Cash balance weighted average interest crediting rates	3%	3%	3%

Pension and Other Postretirem_4

Pension and Other Postretirement Benefits (Accumulated Benefit Obligations) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Accumulated benefit obligation	$ 2,272	$ 2,995

Pension and Other Postretirem_5

Pension and Other Postretirement Benefits (Summary Of Projected Benefit Obligations And Funded Status For Defined Benefit Pension And Other Postretirement Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	$ 3,043
Fair value of plan assets at December 31	1,838		$ 3,043
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations at January 1	3,295		3,671
Service cost	228		297
Interest cost	102		93		$ 98
Actuarial gain	(653)	[1]	(169)
Benefits paid(b)	613	[2]	594
Plan amendments	0		0
Other	0		(3)
Benefit obligations at December 31	2,359		3,295		3,671
Fair value of plan assets at January 1	3,043		2,621
Actual return on plan assets	(622)		194
Employer contributions	30		822	[3]
Benefits paid from plan assets	(613)		(594)
Fair value of plan assets at December 31	1,838		3,043		2,621
Funded status at December 31	(521)		(252)
Voluntary contributions by employer			763
Pension Benefits | Pension annuity lift-out
Defined Benefit Plan Disclosure [Line Items]
Benefits paid(b)	285
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations at January 1	828		1,131
Service cost	26		34
Interest cost	21		30		32
Actuarial gain	(168)	[1]	(16)
Benefits paid(b)	57		75
Plan amendments	0		(276)
Other	0		0
Benefit obligations at December 31	650		828		1,131
Fair value of plan assets at January 1	0		0
Actual return on plan assets	0		0
Employer contributions	57		75
Benefits paid from plan assets	(57)		(75)
Fair value of plan assets at December 31	0		0		$ 0
Funded status at December 31	$ (650)		$ (828)
[1]The primary driver of the actuarial gain for the pension and other postretirement benefits plans in 2022 was the increase in discount rate compared to 2021[2]Of the $613 million in benefits paid in 2022, $285 million is related to the pension annuity lift-out.[3]Of the $822 million in pension employer contributions in 2021, $763 million was voluntary contributions.

Pension and Other Postretirem_6

Pension and Other Postretirement Benefits (Amounts Recognized in Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (1,114)	$ (1,015)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(7)	(11)
Noncurrent liabilities	(514)	(241)
Accrued benefit cost	(521)	(252)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(50)	(54)
Noncurrent liabilities	(600)	(774)
Accrued benefit cost	$ (650)	$ (828)

Pension and Other Postretirem_7

Pension and Other Postretirement Benefits (Before Tax Amounts Unrecognized in Net Periodic Benefit Cost Included in AOCI) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 386	$ 360
Prior service credit	(114)	(159)
Pension Benefits | LOOP LLC and Explorer Pipeline
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	(11)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	19	192
Prior service credit	(224)	$ (246)
Other Benefits | LOOP LLC and Explorer Pipeline
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 1

Pension and Other Postretirem_8

Pension and Other Postretirement Benefits (Components Of Net Periodic Benefit Cost And Other Comprehensive (Income) Loss) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service (cost) credit		$ 67	$ 43
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		230	287	$ 283
Interest cost		102	93	98
Expected return on plan assets		(142)	(139)	(133)
Amortization of prior service cost (credit)		(45)	(45)	(45)
Amortization – actuarial loss		4	37	36
Settlement loss		79	75	20
Net periodic benefit cost	[1]	228	308	259
Actuarial (gain) loss		109	(227)	179
Prior service cost (credit)		0	0	0
Amortization of actuarial loss		(83)	(112)	(56)
Amortization of prior service (cost) credit		45	45	45
Total recognized in other comprehensive (income) loss		71	(294)	168
Total recognized in net periodic benefit cost and other comprehensive (income) loss		299	14	427
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost		26	34	35
Interest cost		21	30	32
Expected return on plan assets		0	0	0
Amortization of prior service cost (credit)		(22)	2	0
Amortization – actuarial loss		6	10	3
Settlement loss		0	1	0
Net periodic benefit cost	[1]	31	77	70
Actuarial (gain) loss		(167)	(16)	83
Prior service cost (credit)		0	(276)	0
Amortization of actuarial loss		(6)	(11)	(3)
Amortization of prior service (cost) credit		22	(2)	0
Total recognized in other comprehensive (income) loss		(151)	(305)	80
Total recognized in net periodic benefit cost and other comprehensive (income) loss		$ (120)	$ (228)	$ 150
[1]Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years.

Pension and Other Postretirem_9

Pension and Other Postretirement Benefits (Summary Of Assumptions Used To Determine Benefit Obligations And Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Benefit obligation:
Discount rate	5.04%	2.82%	2.44%
Rate of compensation increase	4.18%	5.70%	5.70%
Net periodic benefit cost:
Discount rate	3.33%	2.70%	3%
Expected long-term return on plan assets	5.75%	5.75%	5.75%
Rate of compensation increase	4.18%	5.70%	5.70%
Other Benefits
Benefit obligation:
Discount rate	5.08%	2.93%	2.55%
Rate of compensation increase	4.18%	5.70%	5.70%
Net periodic benefit cost:
Discount rate	2.93%	2.55%	3.23%
Expected long-term return on plan assets	0%	0%	0%
Rate of compensation increase	4.18%	5.70%	5.70%

Pension and Other Postretire_10

Pension and Other Postretirement Benefits (Expected Long-Term Return on Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Defined benefit plan, plan assets, expected long-term rate-of-return, description	The overall expected long-term return on plan assets assumption is determined based on an asset rate-of-return modeling tool developed by a third-party investment group. The tool utilizes underlying assumptions based on actual returns by asset category and inflation and takes into account our asset allocation to derive an expected long-term rate of return on those assets. Capital market assumptions reflect the long-term capital market outlook. The assumptions for equity and fixed income investments are developed using a building-block approach, reflecting observable inflation information and interest rate information available in the fixed income markets. Long-term assumptions for other asset categories are based on historical results, current market characteristics and the professional judgment of our internal and external investment teams

Pension and Other Postretire_11

Pension and Other Postretirement Benefits (Summarizes Assumed Health Care Cost Trend Rates) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Medical Pre-65
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for the following year:	6.60%	5.80%	6%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate):	4.50%	4.50%	4.50%
Year that the rate reaches the ultimate trend rate:	2031	2030	2028
Prescription drugs
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for the following year:	8.90%	6.40%	7%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate):	4.50%	4.50%	4.50%
Year that the rate reaches the ultimate trend rate:	2031	2030	2028

Pension and Other Postretire_12

Pension and Other Postretirement Benefits (Plan Investment Policies And Strategies) (Details)	12 Months Ended
	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, investment goals	The investment policies for our pension plan assets reflect the funded status of the plans and expectations regarding our future ability to make further contributions. Long-term investment goals are to: (1) manage the assets in accordance with the legal requirements of all applicable laws; (2) diversify plan investments across asset classes to achieve an optimal balance between risk and return and between income and growth of assets through capital appreciation; and (3) source benefit payments primarily through existing plan assets and anticipated future returns.The investment goals are implemented to manage the plans’ funded status volatility and minimize future cash contributions. The asset allocation strategy will change over time in response to changes primarily in funded status, which is dictated by current and anticipated market conditions, the independent actions of our investment committee, required cash flows to and from the plans and other factors deemed appropriate. Such changes in asset allocation are intended to allocate additional assets to the fixed income asset class should the funded status improve. The fixed income asset class shall be invested in such a manner that its interest rate sensitivity correlates highly with that of the plans’ liabilities. Other asset classes are intended to provide additional return with associated higher levels of risk. Investment performance and risk is measured and monitored on an ongoing basis through quarterly investment meetings and periodic asset and liability studies
Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Targeted asset allocation	50%
Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Targeted asset allocation	50%

Pension and Other Postretire_13

Pension and Other Postretirement Benefits (Fair Values Of Defined Benefit Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	$ 1,838	$ 3,043
Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	355	647
Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	1,452	2,342
Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	31	54
Cash and Cash Equivalents
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	3	47
Cash and Cash Equivalents | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Cash and Cash Equivalents | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	3	47
Cash and Cash Equivalents | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Common stocks
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	40	61
Common stocks | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	40	61
Common stocks | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Common stocks | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Mutual funds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	104	170
Mutual funds | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	104	170
Mutual funds | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Mutual funds | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Pooled funds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	742	1,192
Pooled funds | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Pooled funds | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	742	1,192
Pooled funds | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Corporate notes and bonds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	582	800
Corporate notes and bonds | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Corporate notes and bonds | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	582	800
Corporate notes and bonds | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Government
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	252	523
Government | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	211	415
Government | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	41	108
Government | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Pooled funds
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	79	192
Pooled funds | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Pooled funds | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	79	192
Pooled funds | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Private equity
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	13	19
Private equity | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Private equity | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Private equity | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	13	19	$ 23
Real estate
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	14	17
Real estate | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Real estate | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	0
Real estate | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	14	17	20
Other
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	9	22
Other | Level 1
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	0	1
Other | Level 2
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	5	3
Other | Level 3
Defined Benefit Plan, Plan Assets, Allocation [Line Items]
Plan asset investments, at fair value	$ 4	$ 18	$ 19

Pension and Other Postretire_14

Pension and Other Postretirement Benefits (Reconciliation Of Beginning And Ending Balances Of Plan Assets Classified As Level 3) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at January 1	$ 3,043
Actual return on plan assets:
Fair value of plan assets at December 31	1,838	$ 3,043
Private equity
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at January 1	19
Actual return on plan assets:
Fair value of plan assets at December 31	13	19
Real estate
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at January 1	17
Actual return on plan assets:
Fair value of plan assets at December 31	14	17
Other
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at January 1	22
Actual return on plan assets:
Fair value of plan assets at December 31	9	22
Level 3
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at January 1	54
Actual return on plan assets:
Fair value of plan assets at December 31	31	54
Level 3 | Private equity
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at January 1	19	23
Actual return on plan assets:
Realized	3	2
Unrealized	(4)	8
Purchases	0	0
Sales	(5)	(14)
Fair value of plan assets at December 31	13	19
Level 3 | Real estate
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at January 1	17	20
Actual return on plan assets:
Realized	2	1
Unrealized	(2)	1
Purchases	1	0
Sales	(4)	(5)
Fair value of plan assets at December 31	14	17
Level 3 | Other
Defined Benefit Plan, Plan Assets, Level 3 Reconciliation [Line Items]
Fair value of plan assets at January 1	18	19
Actual return on plan assets:
Realized	0	0
Unrealized	7	0
Purchases	0	0
Sales	(21)	(1)
Fair value of plan assets at December 31	$ 4	$ 18

Pension and Other Postretire_15

Pension and Other Postretirement Benefits (Contributions To Defined Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to defined contribution plans	$ 167	$ 165	$ 180
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension contributions	$ 15
Expected future employer contributions, next fiscal year, description	For 2023, we do not project any required funding, but we may make voluntary contributions to our funded pension plans at our discretion.
Unfunded Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plans, estimated future employer contributions in next fiscal year	$ 7
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plans, estimated future employer contributions in next fiscal year	$ 50

Pension and Other Postretire_16

Pension and Other Postretirement Benefits (Estimated Future Benefit Payments) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2023	$ 148
2024	155
2025	165
2026	173
2027	175
2028 through 2032	1,010
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2023	50
2024	50
2025	50
2026	50
2027	50
2028 through 2032	$ 258

Pension and Other Postretire_17

Pension and Other Postretirement Benefits (Multiemployer Pension Plan) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) employee		Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Multiemployer Plan [Line Items]
Multiemployer Plan, Pension, Insignificant, Certified Zone Status [Fixed List]	Red		Red
Funding improvement plan and rehabilitation plan	Implemented
Surcharge - imposed	No
Multiemployer Plans, Minimum Contribution, Description	This agreement has a minimum contribution requirement of $338 per week per employee for 2023.
Number of employees participated in the plan | employee	258
Pension Benefits
Multiemployer Plan [Line Items]
Multiemployer Plans, General Nature	We contribute to one multiemployer defined benefit pension plan under the terms of a collective-bargaining agreement that covers some of our union-represented employees. The risks of participating in this multiemployer plan are different from single-employer plans in the following aspects:•Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers.•If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers.•If we choose to stop participating in the multiemployer plan, we may be required to pay that plan an amount based on the underfunded status of the plan, referred to as a withdrawal liability.
Pension Benefits | Central States, Southeast and Southwest Pension Plan
Multiemployer Plan [Line Items]
Multiemployer Plan, Pension, Insignificant, Employer Contribution, Cost | $	$ 5	[1]	$ 5	$ 5
[1]This agreement has a minimum contribution requirement of $338 per week per employee for 2023. A total of 258 employees participated in the plan as of December 31, 2022.

Pension and Other Postretire_18

Pension and Other Postretirement Benefits (Multiemployer Health and Welfare Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contribution cost	$ 7	$ 7	$ 7

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) shares in Millions	12 Months Ended
	Dec. 31, 2022 shares
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards	3 years
Expiration period of awards	10 years
Restricted Stock Awards and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards	3 years
Restricted stock and restricted stock unit awards granted in 2012, additional holding period	1 year
Performance Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period	36 months
MPC 2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized to be delivered under the compensation plan	20.5
MPC 2021 Plan | Performance Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Terms of award	We grant performance share unit awards to certain officer employees. At grant, a performance share unit has a target value equal to the MPC common stock average 30-day closing price prior to the grant date. The actual payout value of a performance share unit is based on company performance (which can range from 0% to 200%) during the three calendar year period beginning in the year of grant, multiplied by MPC’s closing share price on the date the Committee certifies performance. Performance share units have a vesting service period beginning on the grant date and ending on the last day of the three-year performance period. Company performance for purposes of payout will be determined by the relative ranking of the total shareholder return (“TSR”) of MPC common stock over the three-year performance period compared to the TSR of a select group of peer companies and the Standard & Poor’s 500 Index and the Alerian MLP Index over the performance period, as well as the median of MPC’s compensation reference group. These awards settle 100 percent in cash and are accounted for as liability awards and recorded at fair value with a mark-to-market adjustment made each quarter.We also grant performance share unit awards to certain non-officer employees. These performance share unit awards operate as explained above for awards made to certain officer employees, but the awards vest in one-third increments on December 31 of the first, second and third calendar years of the three calendar year performance period.
MPC 2012 Plan | Performance Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Terms of award	No performance share unit awards were granted prior to 2021. Prior to 2021, we granted performance unit awards to certain officer employees under the MPC 2012 Plan. Performance units are dollar-denominated. The target value of all performance units is $1.00, with actual payout up to $2.00 per unit (up to 200 percent of target). Performance unit awards have a 36-month requisite service period. The payout value of these awards is determined by the relative ranking of the TSR of MPC common stock compared to the TSR of a select group of peer companies, as well as the Standard & Poor’s 500 Energy Index fund over an average of four measurement periods. These awards are settled 25 percent in MPC common stock and 75 percent in cash. The number of shares actually distributed is determined as 25 percent of the final payout divided by the closing price of MPC common stock on the day the Committee certifies the final TSR rankings, or the next trading day if the certification is made outside of normal trading hours. The performance units paying out in cash are accounted for as liability awards and recorded at fair value with a mark-to-market adjustment made each quarter. The performance units that settle in shares are accounted for as share awards and do not receive dividend equivalents.

Share-Based Compensation (Stock

Share-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-Based Payment Arrangement [Abstract]
Share-based compensation expense	$ 153	$ 88	$ 100
Tax benefit recognized on share-based compensation expense	37	22	25
Cash received by MPC upon exercise of stock option awards	243	106	11
Tax benefit received for tax deductions for stock awards exercised	$ 53	$ 13	$ 16

Share-Based Compensation (Summa

Share-Based Compensation (Summary Of Stock Option Award Activity) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options exercised	$ 247	$ 88	$ 25
Unrecognized compensation cost	$ 1
Weighted average recognition period, in years	2 months 12 days
Number of Shares
Outstanding, beginning balance	7,795,036
Exercised	(5,267,328)
Forfeited or expired	(38,474)
Outstanding, ending balance	2,489,234	7,795,036
Vested and expected to vest at December 31, 2021 (in shares)	2,488,962
Exercisable at December 31, 2021 (in shares)	2,000,853
Weighted Average Exercise Price
Outstanding, beginning balance (in USD per share)	$ 46.23
Exercised (in USD per share)	46.16
Forfeited or expired (in USD per share)	20.87
Outstanding, ending balance (in USD per share)	46.78	$ 46.23
Vested and expected to vest at December 31, 2021 (in USD per share)	46.78
Exercisable at December 31, 2021 (in USD per share)	$ 51.77
Weighted Average Remaining Contractual Terms (in years)
Vested and expected to vest at December 31, 2021	4 years 1 month 6 days
Exercisable at December 31, 2021 (in years)	3 years 3 months 18 days
Aggregate Intrinsic Value (Millions of dollars)
Vested and expected to vest at December 31, 2021 (in USD)	$ 173
Exercisable at December 31, 2021 (in USD)	$ 129

Share-Based Compensation (Sum_2

Share-Based Compensation (Summary Of Restricted Stock Award Activity) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restricted Stock
Number of Shares
Unvested, beginning balance	194,629
Granted	0
Vested	(191,833)
Forfeited	(2,105)
Unvested, ending balance	691	194,629
Weighted Average Grant Date Fair Value
Unvested, beginning balance (in USD per share)	$ 60.95
Granted (in USD per share)	0	$ 0	$ 56.49
Vested (in USD per share)	60.98
Forfeited (in USD per share)	60.92
Unvested, ending balance (in USD per share)	$ 54.60	$ 60.95
Restricted Stock Units
Number of Shares
Unvested, beginning balance	2,313,919
Granted	653,378
Vested	(1,026,720)
Forfeited	(154,427)
Unvested, ending balance	1,786,150	2,313,919
Weighted Average Grant Date Fair Value
Unvested, beginning balance (in USD per share)	$ 35.84
Granted (in USD per share)	75.81	$ 55.27	$ 22.82
Vested (in USD per share)	34.24
Forfeited (in USD per share)	47.64
Unvested, ending balance (in USD per share)	$ 50.36	$ 35.84

Share-Based Compensation (Sum_3

Share-Based Compensation (Summary Of Values Related To Vested And Unvested Restricted Stock Awards) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic Value of Awards Vested During the Period (Millions of dollars)	$ 17	$ 20	$ 18
Grant date fair value of performance units granted	$ 0	$ 0	$ 56.49
Unrecognized compensation cost	$ 1
Weighted average recognition period, in years	1 month 6 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic Value of Awards Vested During the Period (Millions of dollars)	$ 99	$ 90	$ 59
Grant date fair value of performance units granted	$ 75.81	$ 55.27	$ 22.82
Unrecognized compensation cost	$ 54
Weighted average recognition period, in years	1 year 2 months 4 days

Share-Based Compensation (Sum_4

Share-Based Compensation (Summary Of Performance Unit Awards) (Details) - Performance Unit Awards	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period	26,685
Number of Units
Unvested, beginning balance	6,255,283
Vested	(6,221,223)
Forfeited	(34,060)
Unvested, ending balance	0
Weighted Average Grant Date Fair Value
Unvested, beginning balance (in USD per share) | $ / shares	$ 0.78
Vested (in USD per share) | $ / shares	0.77
Forfeited (in USD per share) | $ / shares	0.89
Unvested, ending balance (in USD per share) | $ / shares	$ 0

Share-Based Compensation (Weigh

Share-Based Compensation (Weighted Average Assumptions Used to Value Performance Unit Awards) (Details) - Performance Unit Awards	12 Months Ended
	Dec. 31, 2020 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.90%
Look-back period (in years)	2 years 9 months 18 days
Expected volatility	30.40%
Grant date fair value of performance units granted	$ 0.89

Leases (Lessee Narrative) (Deta

Leases (Lessee Narrative) (Details)	12 Months Ended
	Dec. 31, 2022
Minimum
Term of agreements	1 year
Renewal term agreement	1 year
Maximum
Term of agreements	96 years
Renewal term agreement	49 years

Leases (Components of Lease Cos

Leases (Components of Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finance lease cost:
Amortization of right of use assets	$ 81	$ 78	$ 72
Interest on lease liabilities	29	31	35
Operating lease cost	490	565	658
Variable lease cost	59	62	60
Short-term lease cost	772	446	649
Total lease cost	$ 1,431	$ 1,182	$ 1,474

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Disclosure) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets
Right of use assets	$ 1,214	$ 1,372
Liabilities
Operating lease liabilities	368	438
Long-term operating lease liabilities	841	927
Total operating lease liabilities	$ 1,209	$ 1,365
Weighted average remaining lease term (in years)	5 years 1 month 6 days	5 years
Weighted average discount rate	3.55%	3.11%
Assets
Property, plant and equipment, gross	$ 818	$ 815
Less accumulated depreciation	412	336
Property, plant and equipment, net	$ 406	$ 479
Liabilities
Debt due within one year	Debt due within one year	Debt due within one year
Finance lease, liability, current	$ 79	$ 73
Long-term debt	Long-term debt	Long-term debt
Finance lease, liability, noncurrent	$ 451	$ 525
Finance lease obligations	Long-term debt, Debt due within one year	Long-term debt, Debt due within one year
Finance lease obligations	$ 530	$ 598
Weighted average remaining lease term (in years)	9 years 10 months 24 days	10 years 3 months 18 days
Weighted average discount rate	5.09%	5.04%

Leases (Schedule Of Future Mini

Leases (Schedule Of Future Minimum Commitments) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Operating
2023	$ 403
2024	308
2025	228
2026	140
2027	72
2028 and thereafter	172
Gross lease payments	1,323
Less: imputed interest	114
Total operating lease liabilities	1,209	$ 1,365
Finance
2023	104
2024	87
2025	78
2026	75
2027	59
2028 and thereafter	268
Gross lease payments	671
Less: imputed interest	141
Total finance lease liabilities	$ 530	$ 598

Leases (Lessor Narrative) (Deta

Leases (Lessor Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Jul. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Total property, plant and equipment, net	$ 875		$ 745	$ 1,478
Deferred revenue			277
Lease receivables	941	[1]	914
Unguaranteed residual assets	66		$ 63
Sales-type lease, selling profit (loss)	$ 509
[1]This amount does not include the unguaranteed residual assets.

Leases (Lessor -Lease Revenues)

Leases (Lessor -Lease Revenues) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating leases:
Rental income	$ 327	$ 376	$ 398
Rental income, statement of income or comprehensive income [Extensible Enumeration]	Sales and other operating revenues	Sales and other operating revenues	Sales and other operating revenues
Sales-type leases:
Interest income (Sales-type rental revenue-fixed minimum)	$ 46	$ 0	$ 0
Interest income (Revenue from variable lease payments)	16	0	0
Sales-type lease revenue	$ 62	$ 0	$ 0

Leases (Minimum Future Rentals

Leases (Minimum Future Rentals On The Non-Cancellable Operating Leases) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Leases [Abstract]
2023	$ 97
2024	95
2025	64
2026	37
2027	16
2028 and thereafter	21
Total minimum future rentals	$ 330

Leases (Lease Receivables - Sal

Leases (Lease Receivables - Sales-type Leases) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Jul. 31, 2022
2023		$ 169
2024		156
2025		146
2026		137
2027		128
2028 and thereafter		970
Total minimum future rentals		1,706
Less: present value discount		765
Lease receivables		941	[1]	$ 914
Unguaranteed residual assets		66		$ 63
Total sales-type lease assets		1,007
Reclassification, Other
Property, Plant and Equipment, Transfers and Changes		27
Receivables
Lease receivables	[2]	98
Other noncurrent assets
Lease receivables	[3]	$ 843
[1]This amount does not include the unguaranteed residual assets.[2]Presented in receivables, net on the consolidated balance sheets.[3]Presented in other noncurrent assets on the consolidated balance sheets.

Leases (Investments In Assets H

Leases (Investments In Assets Held For Operating Lease By Major Classes) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Jul. 31, 2022	Dec. 31, 2021
Operating Leased Assets [Line Items]
Property, plant and equipment	$ 1,205		$ 2,001
Less accumulated depreciation	330		523
Total property, plant and equipment, net	875	$ 745	1,478
Gathering and transportation
Operating Leased Assets [Line Items]
Property, plant and equipment	94		991
Processing and fractionation
Operating Leased Assets [Line Items]
Property, plant and equipment	973		867
Terminals
Operating Leased Assets [Line Items]
Property, plant and equipment	128		128
Land, building and other
Operating Leased Assets [Line Items]
Property, plant and equipment	$ 10		$ 15

Commitments and Contingencies (

Commitments and Contingencies (Details)	12 Months Ended
	Dec. 31, 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	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Accrued liabilities for remediation	$ 387	$ 401
Accrued liabilities for remediation, statement of financial position [extensible enumeration]	Deferred credits and other liabilities, Other current liabilities	Deferred credits and other liabilities, Other current liabilities
Receivables for recoverable costs	$ 5	$ 6

Commitments and Contingencies_3

Commitments and Contingencies (Asset Retirement Obligations) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Asset retirement obligation, current	$ 27	$ 14
Asset retirement obligations, noncurrent	$ 186	$ 187

Commitments and Contingencies_4

Commitments and Contingencies (Other Legal Proceedings) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jul. 31, 2020	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss contingency, damages sought, value	$ 187
Loss contingency, damages paid, value		$ 4

Commitments and Contingencies_5

Commitments and Contingencies (Guarantees) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Crowley Blue Water Partners
Loss Contingencies [Line Items]
Equity method investments, ownership percentage	50%
Financial Guarantee | Guarantee of Indebtedness of Others | LOOP and LOCAP LLC
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 171
Financial Guarantee | Guarantee of Indebtedness of Others | Bakken Pipeline System
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	170
Financial Guarantee | Guarantee of Indebtedness of Others | Crowley Blue Water Partners
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	101
Other Guarantees
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 160
Indirect | Bakken Pipeline System
Loss Contingencies [Line Items]
Equity method investments, ownership percentage	9.19%

Commitments and Contingencies_6

Commitments and Contingencies (Contractual Commitments and Contingencies) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Contractual commitments to acquire property, plant and equipment and advance funds to equity method investees	$ 289	$ 565

Subsequent Events (Incremental

Subsequent Events (Incremental $5 Billion Share Repurchase Authorization) (Details) $ in Billions	Jan. 31, 2023 USD ($)
Subsequent Event | Share Repurchase Authorization January 2023
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 5

Subsequent Events (MPLX Senior

Subsequent Events (MPLX Senior Notes) (Details) - Subsequent Event - MPLX - USD ($) $ in Millions		2 Months Ended
	Feb. 15, 2023	Mar. 31, 2023	Feb. 09, 2023
Series B Preferred Stock | MPLX
Subsequent Event [Line Items]
Payments for Repurchase of Preferred Stock and Preference Stock	$ 600
Senior Notes
Subsequent Event [Line Items]
Debt instrument, face amount			$ 1,600
Senior Notes | Senior notes, 5.00% due March 2033
Subsequent Event [Line Items]
Debt instrument, face amount			1,100
Senior Notes | Senior notes, 5.65% due March 2053
Subsequent Event [Line Items]
Debt instrument, face amount			$ 500
Senior Notes | Senior notes, 4.500% due July 2023
Subsequent Event [Line Items]
Repayments of debt		$ 1,000