10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission file number 001-35054

Marathon Petroleum Corporation

(Exact name of registrant as specified in its charter)

    

Delaware	27-1284632
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

539 South Main Street, Findlay, Ohio 45840-3229

(Address of principal executive offices) (Zip code)

(419) 422-2121

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act
Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $.01	MPC	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  ☑    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files.) Yes  ☑    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer  ☑        Accelerated Filer ☐    Non-accelerated Filer ☐     Smaller reporting company ☐

Emerging growth company    ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act  ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act) Yes  ☐   No  ☑

There were 638,202,178 shares of Marathon Petroleum Corporation common stock outstanding as of July 30, 2021.

MARATHON PETROLEUM CORPORATION

FORM 10-Q

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2021

TABLE OF CONTENTS

	Page
PART I – FINANCIAL INFORMATION
ITEM 1. FINANCIAL STATEMENTS (UNAUDITED)
CONSOLIDATED STATEMENTS OF INCOME	3
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME	4
CONSOLIDATED BALANCE SHEETS	5
CONSOLIDATED STATEMENTS OF CASH FLOWS	6
CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTEREST	8
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS	9
ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	29
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	53
ITEM 4. CONTROLS AND PROCEDURES	54
PART II – OTHER INFORMATION
ITEM 1. LEGAL PROCEEDINGS	55
ITEM 1A. RISK FACTORS	55
ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	56
ITEM 6. EXHIBITS	57
SIGNATURES	58

Unless otherwise stated or the context otherwise indicates, all references in this Form 10-Q to “MPC,” “us,” “our,” “we” or “the Company” mean Marathon Petroleum Corporation and its consolidated subsidiaries.

1

GLOSSARY OF TERMS

Throughout this report, the following company or industry specific terms and abbreviations are used:

ANS	Alaska North Slope crude oil, an oil index benchmark price
ASC	Accounting Standards Codification
ASU	Accounting Standards Update
barrel	One stock tank barrel, or 42 United States gallons liquid volume, used in reference to crude oil or other liquid hydrocarbons
CBOB	Conventional Blending for Oxygenate Blending
EBITDA (a non-GAAP financial measure)	Earnings Before Interest, Tax, Depreciation and Amortization
EPA	United States Environmental Protection Agency
GAAP	Accounting principles generally accepted in the United States
LA CARB	California Air Resources Board
LA CARBOB	California Reformulated Gasoline Blendstock for Oxygenate Blending
LCM	Lower of cost or market
LIFO	Last in, first out, an inventory costing method
LLS	Louisiana Light Sweet crude oil, an oil index benchmark price
mbpd	Thousand barrels per day
MEH	Magellan East Houston crude oil, an oil index benchmark price
MMBtu	One million British thermal units, an energy measurement
NGL	Natural gas liquids, such as ethane, propane, butanes and natural gasoline
NYMEX	New York Mercantile Exchange
OTC	Over-the-Counter
PP&E	Property, plant and equipment
RIN	Renewable Identification Number
SEC	United States Securities and Exchange Commission
ULSD	Ultra-low sulfur diesel
USGC	U.S. Gulf Coast
VIE	Variable interest entity
WTI	West Texas Intermediate crude oil, an oil index benchmark price

2

PART I – FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

MARATHON PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF INCOME (Unaudited)

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions, except per share data)	2021		2020		2021		2020
Revenues and other income:
Sales and other operating revenues	$	29,615	$	12,195	$	52,326	$	34,399
Income (loss) from equity method investments(a)	93		79		184		(1,154)
Net gain on disposal of assets	—		2		3		5
Other income	119		24		196		47
Total revenues and other income	29,827		12,300		52,709		33,297
Costs and expenses:
Cost of revenues (excludes items below)	27,177		11,502		48,261		31,844
LCM inventory valuation adjustment	—		(1,470)		—		1,715
Impairment expense	—		25		—		7,847
Depreciation and amortization	871		833		1,715		1,696
Selling, general and administrative expenses	625		665		1,200		1,407
Other taxes	189		170		351		368
Total costs and expenses	28,862		11,725		51,527		44,877
Income (loss) from continuing operations	965		575		1,182		(11,580)
Net interest and other financial costs	372		341		725		673
Income (loss) from continuing operations before income taxes	593		234		457		(12,253)
Provision (benefit) for income taxes on continuing operations	5		150		39		(1,801)
Income (loss) from continuing operations, net of tax	588		84		418		(10,452)
Income from discontinued operations, net of tax	8,214		192		8,448		510
Net income (loss)	8,802		276		8,866		(9,942)
Less net income (loss) attributable to:
Redeemable noncontrolling interest	21		21		41		41
Noncontrolling interests	269		246		555		(758)
Net income (loss) attributable to MPC	$	8,512	$	9	$	8,270	$	(9,225)
Per share data (See Note 9)
Basic:
Continuing operations	$	0.46	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.63		0.29		12.98		0.79
Net income (loss) per share	$	13.09	$	0.01	$	12.71	$	(14.21)
Weighted average shares outstanding	650		650		651		649
Diluted:
Continuing operations	$	0.45	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.55		0.29		12.98		0.79
Net income (loss) per share	$	13.00	$	0.01	$	12.71	$	(14.21)
Weighted average shares outstanding	654		650		651		649

(a) The three and six months ended June 30, 2021 and the six months ended June 30, 2020 includes impairment expense. See Note 6 for further information.

The accompanying notes are an integral part of these consolidated financial statements.

3

MARATHON PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)

	Three Months Ended  June 30,				Six Months Ended  June 30,
(Millions of dollars)	2021		2020		2021		2020
Net income (loss)	$	8,802	$	276	$	8,866	$	(9,942)
Other comprehensive income (loss):
Defined benefit plans:
Actuarial changes, net of tax of $61, $—, $64 and $1, respectively	183		(1)		192		3
Prior service, net of tax of $(2), $(3), $(5) and $(6), respectively	(8)		(8)		(16)		(17)
Other, net of tax of $(2), $(1), $(2) and $(1), respectively	(4)		(1)		(4)		(2)
Other comprehensive income (loss)	171		(10)		172		(16)
Comprehensive income (loss)	8,973		266		9,038		(9,958)
Less comprehensive income (loss) attributable to:
Redeemable noncontrolling interest	21		21		41		41
Noncontrolling interests	269		246		555		(758)
Comprehensive income (loss) attributable to MPC	$	8,683	$	(1)	$	8,442	$	(9,241)

The accompanying notes are an integral part of these consolidated financial statements.

4

MARATHON PETROLEUM CORPORATION

CONSOLIDATED BALANCE SHEETS (Unaudited)

(Millions of dollars, except share data)	June 30, 2021		December 31, 2020
Assets
Current assets:
Cash and cash equivalents	$	11,839	$	415
Short-term investments	5,418		—
Receivables, less allowance for doubtful accounts of $44 and $18, respectively	9,771		5,760
Inventories	8,879		7,999
Other current assets	2,685		2,724
Assets held for sale	—		11,389
Total current assets	38,592		28,287
Equity method investments	5,424		5,422
Property, plant and equipment, net	37,996		39,035
Goodwill	8,256		8,256
Right of use assets	1,500		1,521
Other noncurrent assets	2,532		2,637
Total assets	$	94,300	$	85,158
Liabilities
Current liabilities:
Accounts payable	$	12,170	$	7,803
Payroll and benefits payable	651		732
Accrued taxes	5,219		1,105
Debt due within one year	70		2,854
Operating lease liabilities	473		497
Other current liabilities	929		822
Liabilities held for sale	—		1,850
Total current liabilities	19,512		15,663
Long-term debt	28,250		28,730
Deferred income taxes	5,704		6,203
Defined benefit postretirement plan obligations	1,850		2,121
Long-term operating lease liabilities	1,020		1,014
Deferred credits and other liabilities	1,271		1,207
Total liabilities	57,607		54,938
Commitments and contingencies (see Note 24)
Redeemable noncontrolling interest	968		968
Equity
MPC stockholders’ equity:
Preferred stock, no shares issued and outstanding (par value $0.01 per share, 30 million shares authorized)	—		—
Common stock:
Issued – 983 million and 980 million shares (par value $0.01 per share, 2 billion shares authorized)	10		10
Held in treasury, at cost – 345 million and 329 million shares	(16,147)		(15,157)
Additional paid-in capital	33,238		33,208
Retained earnings	12,160		4,650
Accumulated other comprehensive loss	(340)		(512)
Total MPC stockholders’ equity	28,921		22,199
Noncontrolling interests	6,804		7,053
Total equity	35,725		29,252
Total liabilities, redeemable noncontrolling interest and equity	$	94,300	$	85,158

The accompanying notes are an integral part of these consolidated financial statements.

5

MARATHON PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

	Six Months Ended  June 30,
(Millions of dollars)	2021		2020
Operating activities:
Net income (loss)	$	8,866	$	(9,942)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of deferred financing costs and debt discount	41		30
Impairment expense	—		7,847
Depreciation and amortization	1,715		1,696
LCM inventory valuation adjustment	—		1,715
Pension and other postretirement benefits, net	(34)		102
Deferred income taxes	(49)		(529)
Net gain on disposal of assets	(3)		(5)
(Income) loss from equity method investments	(184)		1,154
Distributions from equity method investments	303		275
Income from discontinued operations	(8,448)		(510)
Changes in income tax receivable	20		(1,150)
Net recognized (gains) losses on investments and derivatives	(1)		23
Changes in operating assets and liabilities, net of effects of businesses acquired:
Current receivables	(3,947)		3,095
Inventories	(880)		415
Current accounts payable and accrued liabilities	4,477		(5,188)
Right of use assets and operating lease liabilities, net	4		—
All other, net	(79)		(48)
Cash provided by (used in) operating activities - continuing operations	1,801		(1,020)
Cash provided by operating activities - discontinued operations	33		790
Net cash provided by (used in) operating activities	1,834		(230)
Investing activities:
Additions to property, plant and equipment	(606)		(1,696)
Disposal of assets	81		58
Investments – acquisitions and contributions	(113)		(383)
– redemptions, repayments and return of capital	3		118
Purchases of short-term investments	(5,417)		—
All other, net	220		19
Cash used in investing activities - continuing operations	(5,832)		(1,884)
Cash provided by (used in) investing activities - discontinued operations	21,235		(193)
Net cash provided by (used in) investing activities	15,403		(2,077)
Financing activities:
Commercial paper – issued	7,414		—
– repayments	(8,437)		—
Long-term debt – borrowings	10,775		9,672
– repayments	(13,056)		(6,388)
Debt issuance costs	—		(24)
Issuance of common stock	53		6
Common stock repurchased	(984)		—
Dividends paid	(760)		(755)
Distributions to noncontrolling interests	(613)		(620)
Repurchases of noncontrolling interests	(310)		—
All other, net	(36)		(20)
Net cash provided by (used in) financing activities	(5,954)		1,871
Net change in cash, cash equivalents and restricted cash	$	11,283	$	(436)

6

MARATHON PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

	Six Months Ended  June 30,
(Millions of dollars)	2021		2020
Cash, cash equivalents and restricted cash balances:
Continuing operations - beginning of period	$	416	$	1,395
Discontinued operations - beginning of period(a)	140		134
Less: Discontinued operations - end of period(a)	—		127
Continuing operations - end of period	$	11,839	$	966

(a)Reported as assets held for sale on our consolidated balance sheets.

The accompanying notes are an integral part of these consolidated financial statements.

7

MARATHON PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMBALE NONCONTROLLING INTEREST

(Unaudited)

	MPC Stockholders’ Equity
	Common Stock			Treasury Stock			Additional Paid-in Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Non-controlling Interests		Total Equity		Redeemable Non-controlling Interest
(Shares in millions; amounts in millions of dollars)	Shares	Amount		Shares	Amount
Balance as of December 31, 2020	980	$	10	(329)	$	(15,157)	$	33,208	$	4,650	$	(512)	$	7,053	$	29,252	$	968
Net income (loss)	—	—		—	—		—		(242)		—		286		44		20
Dividends declared on common stock ($0.58 per share)	—	—		—	—		—		(379)		—		—		(379)		—
Distributions to noncontrolling interests	—	—		—	—		—		—		—		(300)		(300)		(20)
Other comprehensive income	—	—		—	—		—		—		1		—		1		—
Stock based compensation	1	—		—	(1)		18		—		—		—		17		—
Equity transactions of MPLX	—	—		—	—		(4)		—		—		(120)		(124)		—
Balance as of March 31, 2021	981	$	10	(329)	$	(15,158)	$	33,222	$	4,029	$	(511)	$	6,919	$	28,511	$	968
Net income	—	—		—	—		—		8,512		—		269		8,781		21
Dividends declared on common stock ($0.58 per share)	—	—		—	—		—		(381)		—		—		(381)		—
Distributions to noncontrolling interests	—	—		—	—		—		—		—		(272)		(272)		(21)
Other comprehensive income	—	—		—	—		—		—		171		—		171		—
Shares repurchased	—	—		(16)	(984)		—		—		—		—		(984)		—
Stock based compensation	2	—		—	(5)		50		—		—		2		47		—
Equity transactions of MPLX	—	—		—	—		(34)		—		—		(114)		(148)		—
Balance as of June 30, 2021	983	$	10	(345)	$	(16,147)	$	33,238	$	12,160	$	(340)	$	6,804	$	35,725	$	968

	MPC Stockholders’ Equity
	Common Stock			Treasury Stock			Additional Paid-in Capital		Retained Earnings		Accumulated Other Comprehensive Income (Loss)		Non-controlling Interests		Total Equity		Redeemable Non-controlling Interest
(Shares in millions; amounts in millions of dollars)	Shares	Amount		Shares	Amount
Balance as of December 31, 2019	978	$	10	(329)	$	(15,143)	$	33,157	$	15,990	$	(320)	$	8,445	$	42,139	$	968
Net income (loss)	—	—		—	—		—		(9,234)		—		(1,004)		(10,238)		20
Dividends declared on common stock ($0.58 per share)	—	—		—	—		—		(377)		—		—		(377)		—
Distributions to noncontrolling interests	—	—		—	—		—		—		—		(300)		(300)		(20)
Other comprehensive loss	—	—		—	—		—		—		(6)		—		(6)		—
Stock based compensation	1	—		—	(2)		17		—		—		1		16		—
Equity transactions of MPLX	—	—		—	—		(5)		—		—		(2)		(7)		—
Other	—	—		—	—		—		1		—		—		1		—
Balance as of March 31, 2020	979	$	10	(329)	$	(15,145)	$	33,169	$	6,380	$	(326)	$	7,140	$	31,228	$	968
Net income	—	—		—	—		—		9		—		246		255		21
Dividends declared on common stock ($0.58 per share)	—	—		—	—		—		(380)		—		—		(380)		—
Distributions to noncontrolling interests	—	—		—	—		—		—		—		(279)		(279)		(21)
Other comprehensive loss	—	—		—	—		—		—		(10)		—		(10)		—
Stock based compensation	—	—		—	(4)		31		—		—		3		30		—
Equity transactions of MPLX	—	—		—	—		8		—		—		(2)		6		—
Other	—	—		—	—		—		(1)		—		—		(1)		—
Balance as of June 30, 2020	979	$	10	(329)	$	(15,149)	$	33,208	$	6,008	$	(336)	$	7,108	$	30,849	$	968

The accompanying notes are an integral part of these consolidated financial statements.

8

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. 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 and its assets and liabilities are presented in our consolidated balance sheets as assets and liabilities held for sale as of December 31, 2020. 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 4 for discontinued operations disclosures.

Basis of Presentation

All significant intercompany transactions and accounts have been eliminated.

These interim consolidated financial statements are unaudited; however, in the opinion of our management, these statements reflect all adjustments necessary for a fair statement of the results for the periods reported. All such adjustments are of a normal, recurring nature unless otherwise disclosed. These interim consolidated financial statements, including the notes, have been prepared in accordance with the rules of the SEC applicable to interim period financial statements and do not include all of the information and disclosures required by GAAP for complete financial statements.

These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020. The results of operations for the three and six months ended June 30, 2021 are not necessarily indicative of the results to be expected for the full year.

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 revenue, 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, beginning August 2, 2020, in accordance with ASC 360, Property, Plant, and Equipment, we ceased recording depreciation and amortization for Speedway’s property, plant and equipment, finite-lived intangible assets and right of use lease assets.

During the second quarter of 2021, we invested a significant portion of the Speedway sale proceeds in investment grade debt, commercial paper and certificates of deposit with maturities greater than three months. As a result, we have updated our accounting policies for short-term investments and fair value as disclosed below:

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 of June 30, 2021 as available-for-sale securities and changes in fair market value are reported in other comprehensive income.

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

9

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. The fair value calculation for these Level 3 instruments at June 30, 2021 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.64 to $1.59 per gallon with a weighted average of $0.81 per gallon and (2) the probability of renewal of 100 percent for the first and second 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. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities.

2. ACCOUNTING STANDARDS

Recently Adopted

We adopted the following ASU during the first six months of 2021, which did not have a material impact to our financial statements or financial statement disclosures:

ASU		Effective Date
2019-12	Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes	January 1, 2021

3. SHORT-TERM INVESTMENTS

Investments Components

The components of investments were as follows:

	June 30, 2021
(In millions)	Fair Value Level	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash and Cash Equivalents		Short-term Investments
Available-for-sale debt securities
Commercial paper	Level 2	$	8,378	$	—	$	—	$	8,378	$	3,907	$	4,471
Certificates of deposit and time deposits	Level 2	4,501		—		—		4,501		3,625		876
U.S. government securities	Level 1	50		—		—		50		50		—
Corporate notes and bonds	Level 2	248		—		—		248		177		71
Total available-for-sale debt securities		$	13,177	$	—	$	—	$	13,177	$	7,759	$	5,418
Cash								4,080		4,080		—
Total								$	17,257	$	11,839	$	5,418

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 to June 30, 2021 were not material. Realized gains/losses were not material. All of our available-for-sale debt securities held as of June 30, 2021 mature within one year or less.

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4. DISCONTINUED OPERATIONS

On May 14, 2021, we completed the sale of Speedway, our company-owned and operated retail transportation fuel and convenience store business, to 7-Eleven for cash proceeds of approximately $21.38 billion. After-tax proceeds were approximately $17.22 billion. This transaction resulted in a pretax gain of $11.68 billion ($8.02 billion after income taxes) after deducting the book value of the net assets and certain other adjustments.

The Speedway sale gain is accounted for as a discrete item within the discontinued operations income tax provision and includes a current tax provision of $4.16 billion and a deferred income tax benefit of $497 million due to the reversal of MPC’s deferred tax liabilities related to Speedway.

The proceeds and related Speedway sale gain may be adjusted in future periods based on provisions of the purchase and sale agreement that allow for adjustments of working capital amounts and other miscellaneous items subsequent to transaction closing date of May 14, 2021.

Results of operations for Speedway are reflected through the close of the sale. The following table presents Speedway results and the gain on sale as reported in income from discontinued operations, net of tax, within our consolidated statements of income.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Revenues, other income and net gain on disposal of assets:
Revenues and other income	$	3,081	$	4,147	$	8,420	$	9,706
Net gain on disposal of assets	11,682		—		11,682		1
Total revenues, other income and net gain on disposal of assets	14,763		4,147		20,102		9,707
Costs and expenses:
Cost of revenues (excludes items below)	2,748		3,524		7,654		8,480
LCM inventory valuation adjustment	—		(10)		—		25
Depreciation and amortization	1		102		3		201
Selling, general and administrative expenses	48		81		121		160
Other taxes	24		44		75		97
Total costs and expenses	2,821		3,741		7,853		8,963
Income from operations	11,942		406		12,249		744
Net interest and other financial costs	2		4		6		10
Income before income taxes	11,940		402		12,243		734
Provision for income taxes	3,726		210		3,795		224
Income from discontinued operations, net of tax	$	8,214	$	192	$	8,448	$	510

Separation Agreements

We have entered into various 15-year fuel supply agreements through which we continue to supply fuel to Speedway.

5. 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 June 30, 2021, we owned approximately 63 percent of the outstanding MPLX common units.

Unit Repurchase Program

On November 2, 2020, MPLX announced its board authorized a unit repurchase program for the repurchase of up to $1 billion of MPLX’s outstanding common units held by the public.

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During the six months ended June 30, 2021, 11,929,998 MPLX common units were repurchased at an average cost per unit of $26.02. Total cash paid for units repurchased during the six months ended June 30, 2021 was $310 million. As of June 30, 2021, MPLX had agreements to acquire 126,293 additional common units for $4 million, which settled in early July 2021. As of June 30, 2021, $657 million remained available under the authorization for future unit repurchases.

MPLX may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, tender offers, accelerated unit repurchases or open market solicitations for units, some of which may be effected through Rule 10b5-1 plans. The timing and amount of repurchases will depend upon several factors, including market and business conditions, and repurchases may be initiated, suspended or discontinued at any time. The repurchase authorization has no expiration date.

Agreements

We have various long-term, fee-based commercial agreements with MPLX. Under these agreements, MPLX provides transportation, storage, distribution and marketing services to us. With certain exceptions, these agreements generally contain minimum volume commitments. These transactions are eliminated in consolidation but are reflected as intersegment transactions between our Refining & Marketing and Midstream segments. We also have agreements with MPLX that establish fees for operational and management services provided between us and MPLX and for executive management services and certain general and administrative services provided by us to MPLX. These transactions are eliminated in consolidation but are reflected as intersegment transactions between our Corporate and Midstream segments.

Noncontrolling Interest

As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows:

	Six Months Ended  June 30,
(In millions)	2021		2020
Increase (decrease) due to issuance/(repurchase) of MPLX common units	$	(76)	$	4
Tax impact	38		(1)
Increase (decrease) in MPC's additional paid-in capital, net of tax	$	(38)	$	3

6. IMPAIRMENTS

In the second quarter of 2021, we recognized impairment expense within our Midstream segment related to the anticipated divestiture and 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.

The table below provides information related to the impairments recognized, along with the location of these impairments within consolidated statement of income.

		Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	Income Statement Line	2021		2020		2021		2020
Goodwill	Impairment expense	$	—	$	—	$	—	$	7,330
Equity method investments	Income (loss) from equity method investments	13		—		13		1,315
Long-lived assets	Impairment expense	—		25		—		517
Long-lived assets	Depreciation and amortization	43		—		43		—
Total impairments		$	56	$	25	$	56	$	9,162

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Goodwill

During the first quarter of 2020, we recorded an impairment of goodwill of $7.33 billion. The $5.516 billion goodwill impairment within the Refining & Marketing segment was primarily driven by the effects of COVID-19 and the decline in commodity prices. The $1.814 billion impairment within the Midstream segment was primarily driven by additional information related to the slowing of drilling activity, which had reduced production growth forecasts from MPLX’s producer customers. 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.

Equity Method Investments

During the first quarter of 2020, we recorded equity method investment impairment charges totaling $1.315 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 was determined based upon applying the discounted cash flow method, an income approach.

Long-lived Assets

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 COVID-19 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 in the first quarter of 2020 to impairment expense on the consolidated statements of income.

During the first quarter of 2020, we 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 COVID-19. 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. We 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 related to its property, plant and equipment and intangibles, which are included in impairment expense on our consolidated statements of income.

Fair values of property, plant and equipment were determined using a combination of income and cost approaches. The income approach utilized significant assumptions including management’s best estimates of the expected future cash flows and the estimated useful life of the asset groups. The cost approach utilized assumptions for the current replacement costs of similar assets adjusted for estimated depreciation and deterioration of the existing equipment and economic obsolescence. The fair value of the intangibles was determined based on applying the multi-period excess earnings method, which is an income approach.

7. 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 24 for more information. The assets of MPLX can only be used to settle their own obligations and their creditors have no recourse to our assets, except as noted earlier.

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The following table presents balance sheet information for the assets and liabilities of MPLX, which are included in our balance sheets.

(In millions)	June 30, 2021		December 31, 2020
Assets
Cash and cash equivalents	$	8	$	15
Receivables, less allowance for doubtful accounts	546		478
Inventories	126		118
Other current assets	46		67
Assets held for sale	—		188
Equity method investments	4,033		4,036
Property, plant and equipment, net	20,352		21,418
Goodwill	7,657		7,657
Right of use assets	297		309
Other noncurrent assets	958		1,006
Liabilities
Accounts payable	$	495	$	468
Payroll and benefits payable	6		4
Accrued taxes	83		76
Debt due within one year	1		764
Operating lease liabilities	63		63
Liabilities held for sale	—		101
Other current liabilities	298		297
Long-term debt	19,234		19,375
Deferred income taxes	11		12
Long-term operating lease liabilities	232		244
Deferred credits and other liabilities	507		437

8. RELATED PARTY TRANSACTIONS

Transactions with related parties were as follows:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Sales to related parties	$	11	$	20	$	54	$	50
Purchases from related parties	219		158		422		353

Sales to related parties, which are included in sales and other operating revenues, consist primarily of refined product sales to certain of our equity affiliates.

Purchases from related parties are included in cost of revenues. We obtain utilities, transportation services and purchase ethanol from certain of our equity affiliates.

9. EARNINGS (LOSS) 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 stock-based compensation awards, provided the effect is not anti-dilutive.

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	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions, except per share data)	2021		2020		2021		2020
Income (loss) from continuing operations, net of tax	$	588	$	84	$	418	$	(10,452)
Less: Net income (loss) attributable to noncontrolling interest	290		267		596		(717)
Net income allocated to participating securities	—		—		—		—
Income (loss) from continuing operations available to common stockholders	298		(183)		(178)		(9,735)
Income from discontinued operations, net of tax	8,214		192		8,448		510
Income (loss) available to common stockholders	$	8,512	$	9	$	8,270	$	(9,225)
Weighted average common shares outstanding:
Basic	650		650		651		649
Effect of dilutive securities	4		—		—		—
Diluted	654		650		651		649
Income (loss) available to common stockholders per share:
Basic:
Continuing operations	$	0.46	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.63		0.29		12.98		0.79
Net income (loss) per share	$	13.09	$	0.01	$	12.71	$	(14.21)
Diluted:
Continuing operations	$	0.45	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.55		0.29		12.98		0.79
Net income (loss) per share	$	13.00	$	0.01	$	12.71	$	(14.21)

The following table summarizes the shares that were anti-dilutive and, therefore, were excluded from the diluted share calculation.

	Three Months Ended  June 30,		Six Months Ended  June 30,
(In millions)	2021	2020	2021	2020
Shares issuable under stock-based compensation plans	3	9	8	11

10. EQUITY

In connection with the Speedway sale, our board of directors approved an additional $7.1 billion share repurchase authorization bringing total share repurchase authorizations to $10.0 billion prior to the June tender of shares discussed below. The authorization has no expiration date.

We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, tender offers, accelerated share repurchases or open market solicitations for shares, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be discontinued at any time.

On June 15, 2021, MPC completed a modified Dutch auction tender offer, purchasing 15,573,365 shares of its common stock at a purchase price of $63.00 per share, for an aggregate purchase price of approximately $981 million, excluding fees and expenses related to the tender offer. As of June 30, 2021, MPC has $9.02 billion remaining under its share repurchase authorizations.

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11. 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 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 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 and to independent entrepreneurs who operate primarily Marathon® branded outlets, 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.

Segment income represents income (loss) from operations attributable to the reportable segments. Corporate consists primarily of MPC’s corporate administrative expenses and costs related to certain non-operating assets, except for corporate overhead expenses attributable to MPLX, which are included in the Midstream segment. In addition, certain items that affect comparability (as determined by the chief operating decision maker (“CODM”)) are not allocated to the reportable segments. 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.

The following reconciles segment income (loss) from operations to income (loss) from continuing operations before income taxes as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	224	$	(1,544)	$	(374)	$	(2,041)
Midstream	977		869		1,949		1,774
Segment income (loss) from operations	1,201		(675)		1,575		(267)
Corporate	(180)		(195)		(337)		(428)
Items not allocated to segments:
Transaction-related costs(a)	—		—		—		(8)
Impairments(b)	(56)		(25)		(56)		(9,162)
LCM inventory valuation adjustment	—		1,470		—		(1,715)
Income (loss) from continuing operations	965		575		1,182		(11,580)
Net interest and other financial costs	372		341		725		673
Income (loss) from continuing operations before income taxes	$	593	$	234	$	457	$	(12,253)

(a)Includes costs incurred in connection with the Midstream strategic review. Costs incurred in connection with the Speedway separation are included in discontinued operations. See Note 4.

(b)Includes impairment of goodwill, equity method investments and long lived assets. See Note 6 for additional information.

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The following reconciles segment depreciation and amortization to total depreciation and amortization as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	466	$	463	$	944	$	936
Midstream	331		330		665		675
Segment depreciation and amortization	797		793		1,609		1,611
Corporate	74		40		106		85
Total depreciation and amortization	$	871	$	833	$	1,715	$	1,696

The following reconciles segment revenues to sales and other operating revenues as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing
Revenues from external customers(a)	$	28,554	$	11,387	$	50,215	$	32,671
Intersegment revenues	30		4		58		29
Refining & Marketing segment revenues	28,584		11,391		50,273		32,700
Midstream
Revenues from external customers(a)	1,061		808		2,111		1,728
Intersegment revenues	1,248		1,165		2,447		2,406
Midstream segment revenues	2,309		1,973		4,558		4,134
Total segment revenues	30,893		13,364		54,831		36,834
Less: intersegment revenues	1,278		1,169		2,505		2,435
Sales and other operating revenues	$	29,615	$	12,195	$	52,326	$	34,399

(a)Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 4 and 8 for additional information.

The following reconciles segment capital expenditures and investments to total capital expenditures:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	176	$	271	$	310	$	741
Midstream	178		425		316		899
Segment capital expenditures and investments	354		696		626		1,640
Less investments in equity method investees	62		214		113		383
Plus:
Corporate	23		18		44		45
Capitalized interest	16		27		30		56
Total capital expenditures(a)	$	331	$	527	$	587	$	1,358

(a)Includes changes in capital expenditure accruals. See Note 21 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2021 and 2020 as reported in the consolidated statements of cash flows.

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12. NET INTEREST AND OTHER FINANCIAL COSTS

Net interest and other financial costs were as follows:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Interest income	$	(2)	$	(2)	$	(3)	$	(8)
Interest expense	337		371		688		726
Interest capitalized	(19)		(34)		(36)		(71)
Pension and other postretirement non-service costs(a)	56		(1)		56		(4)
Other financial costs	—		7		20		30
Net interest and other financial costs	$	372	$	341	$	725	$	673

(a)See Note 23.

13. INCOME TAXES

We recorded a combined federal, state and foreign income tax provision of $5 million and $39 million for the three and six months ended June 30, 2021, respectively, which was lower than the tax computed at the U.S. statutory rate primarily due to permanent tax differences related to income attributable to noncontrolling interests.

We recorded a combined federal, state and foreign income tax provision of $150 million for the three months ended June 30, 2020, which was higher than the tax computed at the U.S. statutory rate primarily due to impacts attributable to noncontrolling interests, state taxes and the tax rate differential resulting from the expected net operating loss (“NOL”) carryback provided under the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”). We recorded a combined federal, state and foreign income tax benefit of $1,801 million for the six months ended June 30, 2020, which was lower than the tax computed at the U.S. statutory rate primarily due to a significant amount of our pre-tax loss consisting of non-tax deductible goodwill impairment charges, partially offset by the tax rate differential resulting from the expected 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 those ownership interests is paid by those interests, but this benefit was lower for the six months ended June 30, 2020 due to impairment charges recorded by MPLX.

A reconciliation of the continuing operations tax provision (benefit) in dollars as determined using the federal statutory income tax rate applied to income (loss) before income taxes to the provision (benefit) for income taxes is shown in the table below.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Tax computed at statutory rate	$	125	$	49	$	96	$	(2,573)
State and local income taxes, net of federal income tax effects	13		28		22		(216)
Goodwill impairment	—		—		—		1,157
Noncontrolling interests	(100)		43		(69)		144
Legislation(a)	(23)		18		(17)		(325)
Unrecognized tax benefits	2		—		16		—
Other	(12)		12		(9)		12
Total provision (benefit) for income tax from continuing operations	$	5	$	150	$	39	$	(1,801)

(a)2020 reflects the impact of the CARES Act.

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 when tax was previously paid in the carryback years. As provided by the NOL carryback statute in the CARES Act, as of June 30, 2021, we have recorded an income tax receivable of $2.1 billion in other current assets. This reflects our estimate of the refund of previously paid tax and we expect to receive nearly all of the refund during the second half of 2021. We are working with the Internal Revenue Service (“IRS”) to facilitate the refund, but we do not control the timing of this payment.

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14. INVENTORIES

(In millions)	June 30, 2021		December 31, 2020
Crude oil	$	2,780	$	2,588
Refined products	5,178		4,478
Materials and supplies	921		933
Total	$	8,879	$	7,999

Inventories are carried at the lower of cost or market value. Costs of crude oil and refined products are aggregated on a consolidated basis for purposes of assessing whether the LIFO cost basis of these inventories may have to be written down to market values.

15. PROPERTY, PLANT AND EQUIPMENT

	June 30, 2021						December 31, 2020
(In millions)	Gross PP&E		Accumulated Depreciation		Net PP&E		Gross PP&E		Accumulated Depreciation		Net PP&E
Refining & Marketing	$	30,573	$	14,086	$	16,487	$	30,306	$	13,257	$	17,049
Midstream	27,832		6,820		21,012		27,677		6,217		21,460
Corporate	1,389		892		497		1,356		830		526
Total	$	59,794	$	21,798	$	37,996	$	59,339	$	20,304	$	39,035

16. 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 have settled 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.

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(In millions)	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	(32)		(16)		(48)
Restructuring reserve balance at March 31, 2021	$	6	$	87	$	93
Cash payments	(5)		(11)		(16)
Restructuring reserve balance at June 30, 2021	$	1	$	76	$	77

(a)The restructuring reserve was zero until the third quarter of 2020.

17. FAIR VALUE MEASUREMENTS

Fair Values—Recurring

The following tables present assets and liabilities accounted for at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 by fair value hierarchy level. We have elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty, including any related cash collateral as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the following tables.

	June 30, 2021
	Fair Value Hierarchy
(In millions)	Level 1		Level 2		Level 3		Netting and Collateral(a)		Net Carrying Value on Balance Sheet(b)		Collateral Pledged Not Offset
Assets:
Commodity contracts	$	340	$	1	$	—	$	(336)	$	5	$	74
Liabilities:
Commodity contracts	$	376	$	6	$	—	$	(382)	$	—	$	—
Embedded derivatives in commodity contracts	—		—		102		—		102		—

	December 31, 2020
	Fair Value Hierarchy
(In millions)	Level 1		Level 2		Level 3		Netting and Collateral(a)		Net Carrying Value on Balance Sheet(b)		Collateral Pledged Not Offset
Assets:
Commodity contracts	$	82	$	6	$	—	$	(80)	$	8	$	31
Liabilities:
Commodity contracts	$	81	$	10	$	—	$	(91)	$	—	$	—
Embedded derivatives in commodity contracts	—		—		63		—		63		—

(a)Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2021, cash collateral of $46 million was netted with the mark-to-market derivative liabilities. As of December 31, 2020, cash collateral of $11 million was netted with mark-to-market derivative liabilities.

(b)We have no derivative contracts that are subject to master netting arrangements reflected gross on the balance sheet.

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The following is a reconciliation of the beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Beginning balance	$	66	$	45	$	63	$	60
Unrealized and realized (gains) losses included in net income	39		7		45		(7)
Settlements of derivative instruments	(3)		(1)		(6)		(2)
Ending balance	$	102	$	51	$	102	$	51
The amount of total losses (gains) for the period included in earnings attributable to the change in unrealized losses (gains) relating to assets still held at the end of period:	$	39	$	6	$	41	$	(7)

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 fixed and floating rate 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 $27.9 billion and $31.5 billion at June 30, 2021, respectively, and approximately $31.1 billion and $34.9 billion at December 31, 2020, respectively. These carrying and fair values of our debt exclude the unamortized issuance costs which are netted against our total debt.

18. DERIVATIVES

For further information regarding the fair value measurement of derivative instruments, including any effect of master netting agreements or collateral, see Note 17. We do not designate any of our commodity derivative instruments as hedges for accounting purposes.

Derivatives that are not designated as accounting hedges may include commodity derivatives used to hedge price risk on (1) inventories, (2) fixed price sales of refined products, (3) the acquisition of foreign-sourced crude oil, (4) the acquisition of ethanol for blending with refined products, (5) the sale of NGLs, (6) the purchase of natural gas and (7) the purchase of soybean oil.

The following table presents the fair value of derivative instruments as of June 30, 2021 and December 31, 2020 and the line items in the balance sheets in which the fair values are reflected. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under the terms of our master netting arrangements including cash collateral on deposit with, or received from, brokers. We offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements when a legal right of offset exists. As a result, the asset and liability amounts below will not agree with the amounts presented in our consolidated balance sheets.

(In millions)	June 30, 2021				December 31, 2020
Balance Sheet Location	Asset		Liability		Asset		Liability
Commodity derivatives
Other current assets	$	341	$	382	$	88	$	91
Other current liabilities(a)	—		14		—		7
Deferred credits and other liabilities(a)	—		88		—		56

(a)     Includes embedded derivatives.

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The table below summarizes open commodity derivative contracts for crude oil, refined products and blending products as of June 30, 2021.

	Percentage of contracts that expire next quarter	Position
(Units in thousands of barrels)		Long	Short
Exchange-traded(a)
Crude oil	64.2%	32,507	37,899
Refined products	87.6%	19,615	23,055
Blending products	64.9%	2,624	5,055
Soybean oil	92.8%	1,702	1,838

(a)    Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 60 long and 1,460 short; Refined products - 380 long and 210 short; Blending products - 135 short

The following table summarizes the effect of all commodity derivative instruments in our consolidated statements of income: 

	Gain (Loss)
(In millions)	Three Months Ended  June 30,				Six Months Ended  June 30,
Income Statement Location	2021		2020		2021		2020
Sales and other operating revenues	$	(5)	$	(7)	$	(15)	$	77
Cost of revenues	(168)		(105)		(233)		26
Total	$	(173)	$	(112)	$	(248)	$	103

19. DEBT

Our outstanding borrowings at June 30, 2021 and December 31, 2020 consisted of the following:

(In millions)	June 30, 2021		December 31, 2020
Marathon Petroleum Corporation:
Commercial paper	$	—	$	1,024
Senior notes	8,549		9,849
Notes payable	1		1
Finance lease obligations	602		634
Total	$	9,152	$	11,508
MPLX LP:
Bank revolving credit facility	—		175
Senior notes	19,600		20,350
Finance lease obligations	9		11
Total	$	19,609	$	20,536
Total debt	$	28,761	$	32,044
Unamortized debt issuance costs	(144)		(154)
Unamortized (discount) premium, net	(297)		(306)
Amounts due within one year	(70)		(2,854)
Total long-term debt due after one year	$	28,250	$	28,730

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Available Capacity under our Credit Facilities as of June 30, 2021

(Dollars in millions)	Total Capacity		Outstanding Borrowings		Outstanding Letters of Credit		Available Capacity		Weighted Average Interest Rate		Expiration
MPC, excluding MPLX
MPC bank revolving credit facility	$	5,000	$	—	$	1	$	4,999	—	%	October 2023
MPC trade receivables securitization facility	100		—		—		100		—		July 2021
MPLX
MPLX bank revolving credit facility	3,500		—		—		3,500		—	%	July 2024

MPC 364-Day Bank Revolving Credit Facilities

In February 2021, we elected to terminate our $1 billion unsecured 364-day revolving credit facility due in April 2021. This facility provided us with additional liquidity and financial flexibility during the then ongoing commodity price and demand downturn. There were no borrowings under this credit facility, and we determined that the incremental borrowing capacity of the facility was no longer necessary. We do not intend to replace this facility. We incurred no early termination fees as a result of the early termination of this credit agreement.

Effective June 18, 2021, we terminated our $1 billion unsecured 364-day revolving credit facility due in September 2021. There were no borrowings under this credit facility, and we determined that the incremental borrowing capacity of the facility was no longer necessary.

Trade Receivables Securitization Facility

On June 23, 2021, we reduced the capacity under our trade receivables securitization facility from $750 million to $100 million as we determined the incremental borrowing capacity of the facility was no longer necessary. This facility expired on July 16, 2021.

MPC Senior Notes

On March 1, 2021, we repaid the $1 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.

MPLX Senior Notes

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.

On August 4, 2021, MPLX announced the intent to provide notice of the redemption of all of the $1 billion outstanding aggregate principal amount of MPLX's LIBOR plus 1.100% per annum floating rate senior notes due September 9, 2022. The notes are expected to be redeemed on September 3, 2021, at a price equal to 100 percent of the principal amount thereof, plus accrued and unpaid interest to, but not including, the redemption date. MPLX expects to fund the redemption amount with a combination of cash on hand and borrowings under the MPLX credit agreement or the MPC intercompany loan agreement.

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20. REVENUE

The following table presents our revenues from external customers disaggregated by segment and product line.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing:
Refined products	$	26,528	$	10,268	$	46,337	$	30,537
Crude oil	1,866		1,003		3,312		1,878
Services and other	160		116		566		256
Total revenues from external customers	28,554		11,387		50,215		32,671
Midstream:
Refined products	304		123		586		294
Services and other	757		685		1,525		1,434
Total revenues from external customers	1,061		808		2,111		1,728
Sales and other operating revenues	$	29,615	$	12,195	$	52,326	$	34,399

We do not disclose information on the future performance obligations for any contract with expected duration of one year or less at inception. As of June 30, 2021, we do not have future performance obligations that are material to future periods.

Receivables

On the accompanying consolidated balance sheets, receivables, less allowance for doubtful accounts primarily consists of customer receivables. Significant, non-customer balances included in our receivables at June 30, 2021 include matching buy/sell receivables of $3.84 billion.

21. SUPPLEMENTAL CASH FLOW INFORMATION

	Six Months Ended  June 30,
(In millions)	2021		2020
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$	649	$	601
Net income taxes paid to taxing authorities(a)	319		6

(a)Includes income tax payments related to continuing and discontinued operations.

(In millions)	June 30, 2021		December 31, 2020
Cash and cash equivalents(a)	$	11,839	$	415
Restricted cash(b)	—		1
Cash, cash equivalents and restricted cash	$	11,839	$	416

(a)Excludes $140 million of cash at December 31, 2020, representing Speedway store cash, which was included in assets held for sale.

(b)The restricted cash balance is included within other current assets on the consolidated balance sheets.

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The consolidated statements of cash flows exclude changes to the consolidated balance sheets that did not affect cash. The following is a reconciliation of additions to property, plant and equipment to total capital expenditures:

	Six Months Ended  June 30,
(In millions)	2021		2020
Additions to property, plant and equipment per the consolidated statements of cash flows	$	606	$	1,696
Decrease in capital accruals	(19)		(338)
Total capital expenditures	$	587	$	1,358

22. ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table shows the changes in accumulated other comprehensive loss by component. Amounts in parentheses indicate debits.

(In millions)	Pension Benefits		Other Benefits		Gain on Cash Flow Hedge		Workers Compensation		Total
Balance as of December 31, 2019	$	(212)	$	(116)	$	1	$	7	$	(320)
Other comprehensive loss before reclassifications, net of tax of $(4)	(10)		(2)		—		—		(12)
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(23)		—		—		—		(23)
– actuarial loss(a)	18		1		—		—		19
– settlement loss(a)	1		—		—		—		1
Other	—		—		—		(3)		(3)
Tax effect	1		—		—		1		2
Other comprehensive loss	(13)		(1)		—		(2)		(16)
Balance as of June 30, 2020	$	(225)	$	(117)	$	1	$	5	$	(336)

(In millions)	Pension Benefits		Other Benefits		Gain on Cash Flow Hedge		Workers Compensation		Total
Balance as of December 31, 2020	$	(338)	$	(181)	$	1	$	6	$	(512)
Other comprehensive gain (loss) before reclassifications, net of tax of $44	132		1		—		(4)		129
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(23)		1		—		—		(22)
– actuarial loss(a)	24		5		—		—		29
– settlement loss(a)	49		—		—		—		49
Tax effect	(11)		(2)		—		—		(13)
Other comprehensive income (loss)	171		5		—		(4)		172
Balance as of June 30, 2021	$	(167)	$	(176)	$	1	$	2	$	(340)

(a)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 23.

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23. PENSION AND OTHER POSTRETIREMENT BENEFITS

The following summarizes the components of net periodic benefit costs:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Pension Benefits
Service cost	$	72	$	77	$	148	$	140
Interest cost	23		23		46		48
Expected return on plan assets	(29)		(31)		(62)		(65)
Amortization – prior service credit	(12)		(11)		(23)		(22)
– actuarial loss	14		9		25		17
– settlement loss	49		1		49		1
Net periodic pension benefits cost	$	117	$	68	$	183	$	119
Other Benefits
Service cost	$	7	$	9	$	17	$	18
Interest cost	8		8		15		16
Amortization – prior service cost	—		—		1		—
– actuarial loss	3		—		5		1
Net periodic other benefits cost	$	18	$	17	$	38	$	35

The components of net periodic benefit cost other than the service cost component are included in net interest and other financial costs on the consolidated statements of income.

During the six months ended June 30, 2021, we made contributions of $226 million to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $14 million and $24 million, respectively, during the six months ended June 30, 2021.

24. 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 both June 30, 2021 and December 31, 2020, accrued liabilities for remediation totaled $397 million. It is not presently possible to estimate the ultimate amount of all remediation costs that might be incurred or the penalties, if any, that may be imposed. Receivables for recoverable costs from certain states, under programs to assist companies in clean-up efforts related to underground storage tanks at presently or formerly owned or operated retail marketing sites, were $6 million and $7 million at June 30, 2021 and December 31, 2020, respectively.

Governmental and other entities in various states have filed lawsuits against 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.

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We are involved in a number of environmental enforcement matters arising in the ordinary course of business. While the outcome and impact on us cannot be predicted with certainty, management believes the resolution of these environmental matters will not, individually or collectively, have a material adverse effect on our consolidated results of operations, financial position or cash flows.

Other Legal Proceedings

In early 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 covered the rights of way for 23 tracts of land and demanded the immediate cessation of pipeline operations. The notification also assessed trespass damages of approximately $187 million. THPP appealed this determination, which triggered an automatic stay of the requested pipeline shutdown and payment. On October 29, 2020, the Assistant Secretary - Indian Affairs issued an order vacating the BIA’s trespass order and requiring the Regional Director for the BIA Great Plains Region to issue a new decision on or before December 15, 2020 covering all 34 tracts at issue. On December 15, 2020, the Regional Director of the BIA issued a new trespass notice to THPP consistent with the Assistant Secretary - Indian Affairs order vacating the prior trespass order. The new order found that THPP was in trespass and assessed trespass damages of approximately $4 million (including interest), which has been paid. The order also required THPP to immediately cease and desist use of the portion of the pipeline that crosses the property at issue. THPP has complied with the Regional Director’s December 15, 2020 notice. On February 12, 2021, landowners filed suit in the U.S. District Court for the District of North Dakota (the “District of North Dakota”) against THPP, the Department of the Interior, the Assistant Secretary - Indian Affairs, the Interior Board of Indian Appeals and the BIA, requesting, among other things, that decisions by the Assistant Secretary - Indian Affairs and the Interior Board of Indian Appeals be vacated as to the award of damages to plaintiffs. In March 2021, THPP received a copy of an order purporting to vacate all orders related to THPP’s alleged trespass issued by the BIA between July 2, 2020 and January 14, 2021. The order directs the Regional Director of the BIA to reconsider the issue of THPP’s alleged trespass and issue a new order, if necessary, after all interested parties have had an opportunity to be heard. Subsequently, landowners voluntarily dismissed the suit filed in the District of North Dakota. On April 23, 2021, THPP filed a lawsuit in the District of North Dakota against the United States of America, the U.S. Department of the Interior and the BIA challenging the March order purporting to vacate all previous orders related to THPP’s alleged trespass.

MPLX continues to work towards a settlement of this matter with holders of the property rights at issue. Management does not believe the ultimate resolution of this matter will have a material adverse effect on our consolidated financial position, results of operations, or cash flows.

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 have a material adverse effect on our consolidated financial position, results of operations or cash flows.

Guarantees

We have provided certain guarantees, direct and indirect, of the indebtedness of other companies. Under the terms of most of these guarantee arrangements, we would be required to perform should the guaranteed party fail to fulfill its obligations under the specified arrangements. In addition to these financial guarantees, we also have various performance guarantees related to specific agreements.

Guarantees related to indebtedness of equity method investees

LOOP and LOCAP

MPC and MPLX hold interests in an offshore oil port, LOOP, and MPLX holds an interest in a crude oil pipeline system, LOCAP. Both LOOP and LOCAP have secured various project financings with throughput and deficiency agreements. Under the agreements, MPC, as a shipper, is required to advance funds if the investees are unable to service their debt. Any such advances are considered prepayments of future transportation charges. The duration of the agreements varies but tends to follow the terms of the underlying debt, which extend through 2037. Our maximum potential undiscounted payments under these agreements for the debt principal totaled $171 million as of June 30, 2021.

Dakota Access Pipeline

In connection with MPLX’s 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, MPLX entered into a Contingent Equity Contribution Agreement. MPLX, 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.

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In March 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 conduct a full environmental impact statement (“EIS”), and further requested briefing on whether an easement necessary for the operation of the Bakken Pipeline system should be vacated while the EIS is being prepared.

On July 6, 2020, the D.D.C. ordered vacatur of the easement to cross Lake Oahe during the pendency of an EIS and further ordered a shut down of the pipeline by August 5, 2020. The D.D.C. denied a motion to stay that order. Dakota Access and the Army Corps appealed the D.D.C.’s orders to the U.S. Court of Appeals for the District of Columbia Circuit (the “Court of Appeals”). On July 14, 2020, the Court of Appeals issued an administrative stay while the court considered Dakota Access and the Army Corps’ emergency motion for stay pending appeal. On August 5, 2020, the Court of Appeals stayed the D.D.C.’s injunction that required the pipeline be shutdown and emptied of oil by August 5, 2020. The Court of Appeals denied a stay of the D.D.C.’s March order, which required the EIS, and further denied a stay of the D.D.C.’s July order, which vacated the easement. On January 26, 2021, the Court of Appeals upheld the D.D.C.’s order vacating the easement while the Army Corps prepares the EIS. The Court of Appeals reversed the D.D.C.’s order to the extent it directed that the pipeline be shutdown and emptied of oil. On May 21, 2021, the D.D.C. denied a renewed request for an injunction. On June 22, 2021, the D.D.C. issued an order dismissing without prejudice the tribes’ claims against Dakota Access. The judge noted that the plaintiffs may move to reopen the case in the event of a violation of the court’s prior orders. The pipeline remains operational.

If the pipeline is temporarily shut down pending completion of the EIS, 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. It is expected that MPLX would 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 one percent redemption premium required pursuant to the indenture governing the notes) and any accrued and unpaid interest. As of June 30, 2021, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement were approximately $230 million.

Crowley Ocean Partners LLC and Crowley Blue Water Partners LLC

In connection with our 50 percent indirect interest in Crowley Ocean Partners LLC, we have agreed to conditionally guarantee our portion of the obligations of the joint venture and its subsidiaries under a senior secured term loan agreement. The term loan agreement provides for loans of up to $325 million to finance the acquisition of four product tankers. MPC’s liability under the guarantee for each vessel is conditioned upon the occurrence of certain events, including if we cease to maintain an investment grade credit rating or the charter for the relevant product tanker ceases to be in effect and is not replaced by a charter with an investment grade company on certain defined commercial terms. As of June 30, 2021, our maximum potential undiscounted payments under this agreement for debt principal totaled $114 million.

In connection with our 50 percent indirect interest in Crowley Blue Water Partners LLC, we have agreed to provide a conditional guarantee of up to 50 percent of its outstanding debt balance in the event there is no charter agreement in place with an investment grade customer for the entity’s three vessels as well as other financial support in certain circumstances. As of June 30, 2021, our maximum potential undiscounted payments under this arrangement was $111 million.

Other guarantees

We have entered into other guarantees with maximum potential undiscounted payments totaling $99 million as of June 30, 2021, which primarily consist of a commitment to contribute cash to an equity method investee for certain catastrophic events, in lieu of procuring insurance coverage, a commitment to fund a share of the bonds issued by a government entity for construction of public utilities in the event that other industrial users of the facility default on their utility payments and leases of assets containing general lease indemnities and guaranteed residual values.

Contractual Commitments and Contingencies

At June 30, 2021, our contractual commitments to acquire property, plant and equipment and advance funds to equity method investees totaled $562 million.

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 with us if there are significant delays that are not due to force majeure.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This section should also be read in conjunction with the unaudited consolidated financial statements and accompanying footnotes included under Item 1. Financial Statements and in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2020.

Disclosures Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q, particularly Management’s Discussion and Analysis of Financial Condition and Results of Operations and Quantitative and Qualitative Disclosures about Market Risk, includes forward-looking statements that are subject to risks, contingencies or uncertainties. You can identify forward-looking statements by words such as “anticipate,” “believe,” “commitment,” “could,” “design,” “estimate,” “expect,” “forecast,” “goal,” “guidance,” “imply,” “intend,” “may,” “objective,” “opportunity,” “outlook,” “plan,” “policy,” “position,” “potential,” “predict,” “priority,” “project,” “proposition,” “prospective,” “pursue,” “seek,” “should,” “strategy,” “target,” “will,” “would” or other similar expressions that convey the uncertainty of future events or outcomes.

Forward-looking statements include, among other things, statements regarding:

•future financial and operating results;

•environmental, social and governance (“ESG”) goals and targets, including those related to greenhouse gas emissions, diversity and inclusion and ESG reporting;

•our plans to achieve our ESG goals and targets and to monitor and report progress thereon;

•future levels of capital, environmental or maintenance expenditures, general and administrative and other expenses;

•expected savings from the restructuring or reorganization of business components;

•the success or timing of completion of ongoing or anticipated projects or transactions;

•business strategies, growth opportunities and expected investments;

•consumer demand for refined products, natural gas and NGLs;

•the timing and amount of any future common stock repurchases or dividends; and

•the anticipated effects of actions of third parties such as competitors, activist investors, federal, foreign, state or local regulatory authorities, or plaintiffs in litigation.

Our forward-looking statements are not guarantees of future performance, and you should not rely unduly on them, as they involve risks, uncertainties and assumptions that we cannot predict. Material differences between actual results and any future performance suggested in our forward-looking statements could result from a variety of factors, including the following:

•general economic, political or regulatory developments, including changes in governmental policies relating to refined petroleum products, crude oil, natural gas or NGLs, or taxation;

•the magnitude, duration and potential resurgence of the COVID-19 pandemic and its effects, including travel restrictions, business and school closures, increased remote work, stay-at-home orders and other actions taken by individuals, government and the private sector to stem the spread of the virus;

•our ability to realize the expected benefits of the Speedway sale within the expected timeframe or at all;

•impairments;

•the regional, national and worldwide availability and pricing of refined products, crude oil, natural gas, NGLs and other feedstocks;

•disruptions in credit markets or changes to credit ratings;

•the reliability of processing units and other equipment;

•the adequacy of capital resources and liquidity, including availability, timing and amounts of free cash flow necessary to execute business plans and to effect any share repurchases or to maintain or increase the dividend;

•the potential effects of judicial or other proceedings on the business, financial condition, results of operations and cash flows;

•continued or further volatility in and degradation of general economic, market, industry or business conditions as a result of the COVID-19 pandemic, other infectious disease outbreaks, natural hazards, extreme weather events or otherwise;

•compliance with federal and state environmental, economic, health and safety, energy and other policies and regulations and enforcement actions initiated thereunder;

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•adverse market conditions or other risks affecting MPLX;

•refining industry overcapacity or under capacity;

•changes in producer customers’ drilling plans or in volumes of throughput of crude oil, natural gas, NGLs, refined products or other hydrocarbon-based products;

•non-payment or non-performance by our customers;

•changes in the cost or availability of third-party vessels, pipelines, railcars and other means of transportation for crude oil, natural gas, NGLs, feedstocks and refined products;

•the price, availability and acceptance of alternative fuels and alternative-fuel vehicles and laws mandating such fuels or vehicles;

•political and economic conditions in nations that consume refined products, natural gas and NGLs, including the United States and Mexico, and in crude oil producing regions, including the Middle East, Africa, Canada and South America;

•actions taken by our competitors, including pricing adjustments, the expansion and retirement of refining capacity and the expansion and retirement of pipeline capacity, processing, fractionation and treating facilities in response to market conditions;

•completion of pipeline projects within the United States;

•changes in fuel and utility costs for our facilities;

•accidents or other unscheduled shutdowns affecting our refineries, machinery, pipelines, processing, fractionation and treating facilities or equipment, or those of our suppliers or customers;

•acts of war, terrorism or civil unrest that could impair our ability to produce refined products, receive feedstocks or to gather, process, fractionate or transport crude oil, natural gas, NGLs or refined products;

•adverse changes in laws including with respect to tax and regulatory matters;

•political pressure and influence of environmental groups and other stakeholders upon policies and decisions related to the production, gathering, refining, processing, fractionation, transportation and marketing of crude oil or other feedstocks, refined products, natural gas, NGLs or other hydrocarbon-based products;

•labor and material shortages;

•the costs, disruption and diversion of management’s attention associated with campaigns commenced by activist investors; and

•personnel changes.

For additional risk factors affecting our business, see the risk factors described in our Annual Report on Form 10-K for the year ended December 31, 2020. We undertake no obligation to update any forward-looking statements except to the extent required by applicable law.

EXECUTIVE SUMMARY

Business Update

The outbreak of COVID-19 and its development into a pandemic in March 2020 resulted in significant economic disruption globally. Actions taken by various governmental authorities, individuals and companies around the world to prevent the spread of COVID-19 through social distancing restricted travel, many business operations, public gatherings and the overall level of individual movement and in-person interaction across the globe resulted in dramatic reductions in airline flights and motor vehicle use in 2020 as compared to prior to the pandemic.

Through the first six months of 2021, while demand remains below historical levels, we continue to see recovery in the environment in which our business operates, albeit in some markets and regions more or less than others. The increased availability of vaccinations and the corresponding reductions in travel and business restrictions appear to be driving increased economic activity, including the opening of many business and schools as well as more in-person interaction broadly. While we have seen improving results through the first six months of 2021, we are unable to predict the potential effects a resurgence of COVID-19 may have on our financial position and results.

In response to this business environment, we continue to focus on three near-term priorities for our businesses:

Strengthen Competitive Position of Assets

We are committed to positioning our assets so that we are a leader in operational, financial, and sustainability performance and are evaluating the strength and fit of assets in our portfolio. Our goal is that each individual asset generates free-cash-flow back

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to the business and contributes to shareholder returns. With our investments we are focused on high returning projects that we believe will enhance the competitiveness of our portfolio, including our investments in sustainable fuels and technologies that lower our carbon intensity as the global energy mix evolves.

Improve Commercial Performance

We are focused on leveraging advantaged raw material selection, new approaches in the commercial space to be more dynamic amidst changing market conditions and achieving technology improvements to advance our commercial performance.

Lower Cost Structure

We are committed to achieving operational excellence by reducing costs, improving efficiency and driving operational improvements. In response to the pandemic, in March of 2020, we committed to immediately reducing our capital spending and operating expenses. In 2021, we are continuing this focus with planned reductions of over $200 million for our capital expenditures and investments as compared to 2020 (excluding capitalized interest, potential acquisitions and MPLX’s capital investment plan).

In connection with our commitment to lower cost and strengthen the competitive position of our assets, in the third quarter of 2020 we announced strategic actions to lay a foundation for long-term success, including plans to optimize our assets and structurally lower costs in 2021 and beyond. These actions included indefinitely idling the Gallup refinery, initiating actions to strategically reposition the Martinez refinery to a renewable diesel facility and the approval of an involuntary workforce reduction plan. Our results in the first six months of 2021 reflect the favorable effects from these cost reduction actions.

Many uncertainties remain with respect to COVID-19, including its resulting economic effects, and we are unable to predict the ultimate economic impacts from COVID-19 and how quickly our U.S. and economies around the world can recover once the pandemic ultimately subsides. However, the adverse impact of the economic effects on MPC has been and may continue to be significant. We believe we have proactively addressed many of the known impacts of COVID-19 to the extent possible and will strive to continue to do so, but there can be no guarantee the measures will be fully effective.

Strategic Updates

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 $21.38 billion. This transaction resulted in a pretax gain of $11.68 billion ($8.02 billion after income taxes) after deducting the book value of the net assets and certain other adjustments. MPC remains committed to executing its plan to use the proceeds from the sale to strengthen the balance sheet and return capital to shareholders.

In connection with the Speedway sale, our board of directors approved an additional $7.1 billion share repurchase authorization bringing total share repurchase authorizations to $10.0 billion prior to the June tender of shares discussed below.

On June 15, 2021, MPC completed a modified Dutch auction tender offer, purchasing 15,573,365 shares of its common stock at a purchase price of $63.00 per share, for an aggregate purchase price of approximately $981 million, excluding fees and expenses related to the tender offer. As of June 30, 2021, MPC has $9.02 billion remaining under its share repurchase authorizations.

During the first six months of 2021, we utilized a portion of the Speedway sale proceeds to structurally reduce debt through the following actions:

•In June of 2021,we redeemed all of the $300 million outstanding aggregate principal amount of 5.125% senior notes due April 2024.

•In May of 2021, we repaid all outstanding commercial paper borrowings, which along with cash had been used to finance the fourth quarter 2020 repayments of two senior notes with total principal of $1.13 billion.

•On March 1, 2021, we repaid the $1.0 billion outstanding aggregate principal amount of 5.125% senior notes due March 2021.

On February 24, 2021, MPC’s board of directors approved our plan to strategically reposition the Martinez refinery to a renewable diesel facility. Converting the Martinez facility from refining petroleum to manufacturing renewable fuels signals our strong commitment to producing a substantial level of lower carbon-intensity fuels in California. As envisioned, the Martinez facility would start producing approximately 260 million gallons per year of renewable diesel by the second half of 2022, with a potential to build to full capacity of approximately 730 million gallons per year by the end of 2023.

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The Dickinson, North Dakota, renewable fuels facility began ramping operations at the end of 2020 and reached full design operating capacity by the end of the second quarter of 2021. The facility has the capacity to produce 184 million gallons per year of renewable diesel from corn and soybean oil. MPC is selling the renewable diesel into the California market to comply with the California Low Carbon Fuel Standard.

Results

Select results for continuing operations are reflected in the following table.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Income (loss) from continuing operations by segment
Refining & Marketing	$	224	$	(1,544)	$	(374)	$	(2,041)
Midstream	977		869		1,949		1,774
Corporate	(180)		(195)		(337)		(428)
Items not allocated to segments:
Transaction-related costs(a)	—		—		—		(8)
Impairments(b)	(56)		(25)		(56)		(9,162)
LCM inventory valuation adjustment	—		1,470		—		(1,715)
Income (loss) from continuing operations	965		575		1,182		(11,580)
Net interest and other financial costs	372		341		725		673
Income (loss) from continuing operations before income taxes	593		234		457		(12,253)
Provision (benefit) for income taxes on continuing operations	5		150		39		(1,801)
Income (loss) from continuing operations, net of tax	588		84		418		(10,452)

(a)    2020 includes costs incurred in connection with the Midstream strategic review.

(b)    2021 includes impairments of equity method investments and long-lived assets. 2020 includes impairment of goodwill, equity method investments and long lived assets.

Select results for discontinued operations are reflected in the following table.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Income from discontinued operations
Speedway	$	283	$	426	$	613	$	826
Transaction-related costs(a)	(23)		(30)		(46)		(57)
Gain on sale of assets	11,682		—		11,682		—
LCM inventory valuation adjustment	—		10		—		(25)
Income from discontinued operations	11,942		406		12,249		744
Net interest and other financial costs	2		4		6		10
Income from discontinued operations before income taxes	11,940		402		12,243		734
Provision for income taxes on discontinued operations	3,726		210		3,795		224
Income from discontinued operations, net of tax	$	8,214	$	192	$	8,448	$	510

(a)    Costs related to the Speedway separation.

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The following table includes net income (loss) per diluted share data.

	Three Months Ended  June 30,				Six Months Ended  June 30,
	2021		2020		2021		2020
Net income (loss) per diluted share
Continuing operations	$	0.45	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.55		0.29		12.98		0.79
Net income (loss) attributable to MPC	$	13.00	$	0.01	$	12.71	$	(14.21)

Net income (loss) attributable to MPC was $8.51 billion, or $13.00 per diluted share, in the second quarter of 2021 compared to $9 million, or $0.01 per diluted share, for the second quarter of 2020 and $8.27 billion, or $12.71 per diluted share, in the first six months of 2021 compared to $(9.23) billion, or $(14.21) per diluted share, in the first six months of 2020.

For the second quarter of 2021, the change was largely due to the gain on the sale of Speedway and increases in average refined product sales prices and volumes, partially offset by the absence of an LCM benefit recognized in the second quarter of 2020 and a partial period of income from discontinued operations due to the sale of the Speedway business on May 14, 2021.

For the first six months of 2021, the change is primarily due to the gain on the sale of Speedway, the absence of impairment expenses and an LCM inventory charge in the first six months of 2020 and increases in average refined product sales prices and volumes, partially offset by a partial period of income from discontinued operations due to the sale of the Speedway business on May 14, 2021.

See Note 4 to the unaudited consolidated financial statements for additional information on discontinued operations.

Refer to the Results of Operations section for a discussion of consolidated financial results and segment results for the second quarter of 2021 as compared to the second quarter of 2020 and the first six months of 2021 compared to the first six months of 2020.

MPLX

We owned approximately 647 million MPLX common units at June 30, 2021 with a market value of $19.17 billion based on the June 30, 2021 closing price of $29.61 per common unit. On July 27, 2021, MPLX declared a quarterly cash distribution of $0.6875 per common unit payable on August 13, 2021. As a result, MPLX will make distributions totaling $705 million to its common unitholders. MPC’s portion of these distributions is approximately $445 million.

We received limited partner distributions of $890 million from MPLX in the six months ended June 30, 2021 and $904 million in the six months ended June 30, 2020.

During the six months ended June 30, 2021, 11,929,998 MPLX common units were repurchased at an average cost per unit of $26.02. Total cash paid for units repurchased during the six months ended June 30, 2021 was $310 million. As of June 30, 2021, MPLX had agreements to acquire 126,293 additional common units for $4 million, which settled in early July 2021. As of June 30, 2021, $657 million remained available under the authorization for future unit repurchases.

See Note 5 to the unaudited consolidated financial statements for additional information on MPLX.

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Liquidity

Our liquidity, excluding MPLX, totaled $22.35 billion at June 30, 2021 consisting of:

	June 30, 2021
(In millions)	Total Capacity		Outstanding Borrowings		Available Capacity
Bank revolving credit facility(a)	$	5,000	$	1	$	4,999
Trade receivables facility	100		—		100
Total	$	5,100	$	1	$	5,099
Cash and cash equivalents and short-term investments(b)					17,249
Total liquidity					$	22,348

(a)Outstanding borrowings include $1 million in letters of credit outstanding under this facility.

(b)Excludes cash and cash equivalents of MPLX of $8 million.

Effective June 18, 2021, we terminated our $1.0 billion unsecured 364-day revolving credit facility due in September 2021 and on June 23, 2021, we reduced the capacity under our trade receivables securitization facility from $750 million to $100 million. The trade receivables securitization facility expired in July of 2021, however, we plan to secure a new $100 million trade receivable facility in the third quarter of 2021.

Additionally, nearly all of our tax refund of approximately $2.1 billion is expected to be received during the second half of 2021. We are working with the IRS to facilitate the refund, but we do not control the timing of this payment.

MPLX’s liquidity totaled $4.52 billion at June 30, 2021. As of June 30, 2021, MPLX had cash and cash equivalents of $8 million, $3.5 billion available under its $3.5 billion revolving credit agreement and $1.0 billion available through its intercompany loan agreement with MPC.

OVERVIEW OF SEGMENTS

Refining & Marketing

Refining & Marketing segment income from operations depends largely on our Refining & Marketing margin, refining operating costs, refining planned turnarounds, distribution costs, depreciation expenses and refinery throughputs.

Our Refining & Marketing margin is the difference between the prices of refined products sold and the costs of crude oil and other charge and blendstocks refined, including the costs to transport these inputs to our refineries and the costs of products purchased for resale. The crack spread is a measure of the difference between market prices for refined products and crude oil, commonly used by the industry as a proxy for the refining margin. Crack spreads can fluctuate significantly, particularly when prices of refined products do not move in the same direction as the cost of crude oil. As a performance benchmark and a comparison with other industry participants, we calculate Gulf Coast, Mid-Continent and West Coast crack spreads that we believe most closely track our operations and slate of products. The following are used for these crack spread calculations:

•The Gulf Coast crack spread uses three barrels of MEH crude producing two barrels of USGC CBOB gasoline and one barrel of USGC ULSD. In the first quarter of 2021, we transitioned to MEH crude from LLS crude;

•The Mid-Continent crack spread uses three barrels of WTI crude producing two barrels of Chicago CBOB gasoline and one barrel of Chicago ULSD; and

•The West Coast crack spread uses three barrels of ANS crude producing two barrels of LA CARBOB and one barrel of LA CARB Diesel.

Our refineries can process significant amounts of sweet and sour crude oil, which typically can be purchased at a discount to crude oil referenced in our Gulf Coast, Mid-Continent and West Coast crack spreads. The amount of these discounts, which we refer to as the sweet differential and sour differential, can vary significantly, causing our Refining & Marketing margin to differ from blended crack spreads. In general, larger sweet and sour differentials will enhance our Refining & Marketing margin.

Future crude oil differentials will be dependent on a variety of market and economic factors, as well as U.S. energy policy.

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The following table provides sensitivities showing an estimated change in annual net income due to potential changes in market conditions. 

(In millions, after-tax)
Blended crack spread sensitivity(a) (per $1.00/barrel change)	$	838
Sour differential sensitivity(b) (per $1.00/barrel change)	396
Sweet differential sensitivity(c) (per $1.00/barrel change)	381
Natural gas price sensitivity(d) (per $1.00/MMBtu)	275

(a)Crack spread based on 40 percent MEH, 40 percent WTI and 20 percent ANS with Gulf Coast, Mid-Continent and West Coast product pricing, respectively, and assumes all other differentials and pricing relationships remain unchanged.

(b)Sour crude oil basket consists of the following crudes: ANS, Argus Sour Crude Index, Maya and Western Canadian Select. We expect approximately 51 percent of the crude processed at our refineries in 2021 will be sour crude.

(c)Sweet crude oil basket consists of the following crudes: Bakken, Brent, MEH, WTI-Cushing and WTI-Midland. We expect approximately 49 percent of the crude processed at our refineries in 2021 will be sweet crude.

(d)This is consumption-based exposure for our Refining & Marketing segment and does not include the sales exposure for our Midstream segment.

In addition to the market changes indicated by the crack spreads, the sour differential and the sweet differential, our Refining & Marketing margin is impacted by factors such as:

•the selling prices realized for refined products;

•the types of crude oil and other charge and blendstocks processed;

•our refinery yields;

•the cost of products purchased for resale;

•the impact of commodity derivative instruments used to hedge price risk;

•the potential impact of LCM adjustments to inventories in periods of declining prices; and

•the potential impact of LIFO liquidation charges due to draw-downs from historic inventory levels.

Refining & Marketing segment income from operations is also affected by changes in refinery operating costs and refining planned turnaround costs in addition to committed distribution costs. Changes in operating costs are primarily driven by the cost of energy used by our refineries, including purchased natural gas, and the level of maintenance costs. Refining planned turnarounds, requiring temporary shutdown of certain refinery operating units, are periodically performed at each refinery. Distribution costs primarily include long-term agreements with MPLX, which as discussed below include minimum commitments to MPLX, and will negatively impact income from operations in periods when throughput or sales are lower or refineries are idled.

We have various long-term, fee-based commercial agreements with MPLX. Under these agreements, MPLX, which is reported in our Midstream segment, provides transportation, storage, distribution and marketing services to our Refining & Marketing segment. Certain of these agreements include commitments for minimum quarterly throughput and distribution volumes of crude oil and refined products and minimum storage volumes of crude oil, refined products and other products. Certain other agreements include commitments to pay for 100 percent of available capacity for certain marine transportation and refining logistics assets.

Midstream

Our Midstream segment transports, stores, distributes and markets crude oil and refined products, principally for our Refining & Marketing segment. The profitability of our pipeline transportation operations primarily depends on tariff rates and the volumes shipped through the pipelines. The profitability of our marine operations primarily depends on the quantity and availability of our vessels and barges. The profitability of our light product terminal operations primarily depends on the throughput volumes at these terminals. The profitability of our fuels distribution services primarily depends on the sales volumes of certain refined products. The profitability of our refining logistics operations depends on the quantity and availability of our refining logistics assets. A majority of the crude oil and refined product shipments on our pipelines and marine vessels and the refined product throughput at our terminals serve our Refining & Marketing segment and our refining logistics assets and fuels distribution services are used solely by our Refining & Marketing segment. As discussed above in the Refining & Marketing section, MPLX, which is reported in our Midstream segment, has various long-term, fee-based commercial agreements related to services provided to our Refining & Marketing segment. Under these agreements, MPLX has received various commitments of minimum throughput, storage and distribution volumes as well as commitments to pay for all available capacity of certain assets. The volume of crude oil that we transport is directly affected by the supply of, and refiner demand for, crude oil in the markets served directly by our crude oil pipelines, terminals and marine operations. Key factors in this supply and demand balance are the production levels of crude oil by producers in various regions or fields, the availability

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and cost of alternative modes of transportation, the volumes of crude oil processed at refineries and refinery and transportation system maintenance levels. The volume of refined products that we transport, store, distribute and market is directly affected by the production levels of, and user demand for, refined products in the markets served by our refined product pipelines and marine operations. In most of our markets, demand for gasoline and distillate peaks during the summer driving season, which extends from May through September of each year, and declines during the fall and winter months. As with crude oil, other transportation alternatives and system maintenance levels influence refined product movements.

Our Midstream segment also gathers and processes natural gas and NGLs. NGL and natural gas prices are volatile and are impacted by changes in fundamental supply and demand, as well as market uncertainty, availability of NGL transportation and fractionation capacity and a variety of additional factors that are beyond our control. Our Midstream segment profitability is affected by prevailing commodity prices primarily as a result of processing or conditioning at our own or third‑party processing plants, purchasing and selling or gathering and transporting volumes of natural gas at index‑related prices and the cost of third‑party transportation and fractionation services. To the extent that commodity prices influence the level of natural gas drilling by our producer customers, such prices also affect profitability.

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RESULTS OF OPERATIONS

The following discussion includes comments and analysis relating to our results of operations. This discussion should be read in conjunction with Item 1. Financial Statements and is intended to provide investors with a reasonable basis for assessing our historical operations, but should not serve as the only criteria for predicting our future performance.

Consolidated Results of Operations

	Three Months Ended  June 30,						Six Months Ended  June 30,
(In millions)	2021		2020		Variance		2021		2020		Variance
Revenues and other income:
Sales and other operating revenues(a)	$	29,615	$	12,195	$	17,420	$	52,326	$	34,399	$	17,927
Income (loss) from equity method investments	93		79		14		184		(1,154)		1,338
Net gain on disposal of assets	—		2		(2)		3		5		(2)
Other income	119		24		95		196		47		149
Total revenues and other income	29,827		12,300		17,527		52,709		33,297		19,412
Costs and expenses:
Cost of revenues (excludes items below)	27,177		11,502		15,675		48,261		31,844		16,417
LCM inventory valuation adjustment	—		(1,470)		1,470		—		1,715		(1,715)
Impairment expense	—		25		(25)		—		7,847		(7,847)
Depreciation and amortization	871		833		38		1,715		1,696		19
Selling, general and administrative expenses	625		665		(40)		1,200		1,407		(207)
Other taxes	189		170		19		351		368		(17)
Total costs and expenses	28,862		11,725		17,137		51,527		44,877		6,650
Income (loss) from continuing operations	965		575		390		1,182		(11,580)		12,762
Net interest and other financial costs	372		341		31		725		673		52
Income (loss) from continuing operations before income taxes	593		234		359		457		(12,253)		12,710
Provision (benefit) for income taxes on continuing operations	5		150		(145)		39		(1,801)		1,840
Income (loss) from continuing operations, net of tax	588		84		504		418		(10,452)		10,870
Income from discontinued operations, net of tax	8,214		192		8,022		8,448		510		7,938
Net income (loss)	8,802		276		8,526		8,866		(9,942)		18,808
Less net income (loss) attributable to:
Redeemable noncontrolling interest	21		21		—		41		41		—
Noncontrolling interests	269		246		23		555		(758)		1,313
Net income (loss) attributable to MPC	$	8,512	$	9	$	8,503	$	8,270	$	(9,225)	$	17,495

(a)In accordance with discontinued operations accounting, Speedway sales to retail customers and net results are reflected in Income from discontinued operations, net of tax and Refining & Marketing intercompany sales to Speedway are now presented as third party sales through the close of the sale on May 14, 2021.

Second Quarter 2021 Compared to Second Quarter 2020

Net income attributable to MPC increased $8.50 billion in the second quarter of 2021 compared to the second quarter of 2020 largely due to the gain on the sale of Speedway, increases in refined product sales volumes and prices, partially offset by the absence of an LCM inventory benefit in the second quarter of 2020 and a partial period of income from discontinued operations due to the sale of the Speedway business on May 14, 2021.

Revenues and other income increased $17.53 billion primarily due to:

•increased sales and other operating revenues of $17.42 billion primarily due to increased Refining & Marketing segment average refined product sales prices of $1.06 per gallon and increased refined product sales volumes of 611 mbpd; and

•increased other income of $95 million primarily due to higher income on RIN sales.

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Costs and expenses increased $17.14 billion primarily due to:

•increased cost of revenues of $15.68 billion mainly due to higher refined product raw material and crude oil costs;

•the absence of an LCM benefit of $1.47 billion resulting from a lower LCM reserve as of June 30, 2020 as compared to March 31, 2020; and

•decreased selling, general and administrative expenses of $40 million largely due to cost reductions realized from our 2020 workforce reduction and other cost control efforts.

Net interest and other financial costs increased $31 million largely due to pension settlement losses of $49 million, partially offset by decreased interest expense due to lower MPC and MPLX borrowings.

We recorded a combined federal, state and foreign income tax provision of $5 million for the three months ended June 30, 2021, which was lower than the tax computed at the U.S. statutory rate primarily due to permanent tax differences related to income attributable to noncontrolling interests. We recorded a combined federal, state and foreign income tax provision of $150 million for the three months ended June 30, 2020, which was higher than the tax computed at the U.S. statutory rate primarily due to impacts attributable to noncontrolling interests, state taxes and the tax rate differential resulting from the expected NOL carryback provided under the CARES Act.

Noncontrolling interests increased $23 million primarily due to an increase in MPLX’s net income.

Six Months Ended June 30, 2021 Compared to Six Months Ended June 30, 2020

Net income attributable to MPC increased $17.50 billion in the first six months of 2021 compared to the first six months of 2020 primarily due to the gain on the sale of Speedway, the absence of impairment expenses and an LCM inventory charge in the first six months of 2020 and increases in average refined product sales prices and volumes, partially offset by a partial period of income from discontinued operations due to the sale of the Speedway business on May 14, 2021.

Revenues and other income increased $19.41 billion primarily due to:

•increased sales and other operating revenues of $17.93 billion primarily due to increased average refined product sales prices of $0.63 per gallon and increased Refining & Marketing segment refined product sales volumes, which increased 46 mbpd;

•increased income from equity method investments of $1.34 billion largely due to impairments of equity method investments of $1.32 billion recorded in the first six months of 2020 primarily driven by the effects of COVID-19 and the decline in commodity prices; and

•increased other income of $149 million primarily due to higher income on RIN sales.

Costs and expenses increased $6.65 billion primarily due to:

•increased cost of revenues of $16.42 billion primarily due to higher crude oil and refined product raw material costs;

•the absence of an LCM charge of $1.72 billion primarily driven by the effects of COVID-19 and the decline in commodity prices in the prior year;

•decreased impairment expense of $7.85 billion due to impairments recorded for goodwill and long-lived assets in the in the first six months of 2020 primarily driven by the effects of COVID-19 and the decline in commodity prices in the prior year; and

•decreased selling, general and administrative expenses of $207 million largely due to cost reductions realized from our 2020 workforce reduction and other cost control efforts.

Net interest and other financial costs increased $52 million largely due to pension settlement losses of $49 million.

We recorded a combined federal, state and foreign income tax provision of $39 million for the six months ended June 30, 2021, which was lower than the tax computed at the U.S. statutory rate primarily due to permanent tax differences related to income attributable to noncontrolling interests. We recorded a combined federal, state and foreign income tax benefit of $1.80 billion for the six months ended June 30, 2020, which was lower than the tax computed at the U.S. statutory rate primarily due to a significant amount of our pre-tax loss consisting of non-tax deductible goodwill impairment charges, partially offset by the tax rate differential resulting from the expected 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 those ownership interests is paid by those interests, but this benefit was lower for the six months ended June 30, 2020 due to impairment charges recorded by MPLX.

Net income attributable to noncontrolling interests increased $1.31 billion primarily due to an increase in MPLX’s net income largely due to impairment expense recognized during the first six months of 2020.

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Segment Results

Refining & Marketing

The following includes key financial and operating data for the second quarter of 2021 compared to the second quarter of 2020 and the six months ended June 30, 2021 compared to the six months ended June 30, 2020.

(a)Includes intersegment sales to Midstream and sales destined for export.

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	Three Months Ended  June 30,				Six Months Ended  June 30,
	2021		2020		2021		2020
Refining & Marketing Operating Statistics
Net refinery throughput (mbpd)	2,854		2,276		2,710		2,635
Refining & Marketing margin per barrel(a)(b)	12.45		7.64		11.37		10.04
Less:
Refining operating costs per barrel, excluding winter storm effect(c)	4.59		6.13		4.86		6.06
Winter storm effect on refining operating cost(d)	—		—		0.06		—
Distribution costs per barrel	5.04		5.87		5.11		5.23
Refining planned turnaround costs per barrel	0.24		0.78		0.35		1.02
Depreciation and amortization per barrel	1.80		2.24		1.93		1.95
Plus:
Other per barrel(e)	0.08		(0.07)		0.18		(0.04)
Refining & Marketing segment income (loss) per barrel	$	0.86	$	(7.45)	$	(0.76)	$	(4.26)
Fees paid to MPLX included in distribution costs above	$	3.33	$	4.06	$	3.49	$	3.54

(a)Sales revenue less cost of refinery inputs and purchased products, divided by net refinery throughput.

(b)See “Non-GAAP Measures” section for reconciliation and further information regarding this non-GAAP measure.

(c)Includes refining operating costs and major maintenance costs. Excludes planned turnaround and depreciation and amortization expense.

(d)Winter storms in the first quarter of 2021 resulted in higher costs, including maintenance and repairs.

(e)Includes income (loss) from equity method investments, net gain (loss) on disposal of assets and other income.

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The following table presents certain benchmark prices in our marketing areas and market indicators that we believe are helpful in understanding the results of our Refining & Marketing segment. The benchmark crack spreads below do not reflect the market cost of RINs necessary to meet EPA renewable volume obligations for attributable products under the Renewable Fuel Standard.

	Three Months Ended  June 30,				Six Months Ended  June 30,
Benchmark Spot Prices (dollars per gallon)	2021		2020		2021		2020
Chicago CBOB unleaded regular gasoline	$	2.07	$	0.78	$	1.86	$	0.99
Chicago ULSD	2.04		0.88		1.89		1.15
USGC CBOB unleaded regular gasoline	1.99		0.81		1.84		1.03
USGC ULSD	1.95		0.91		1.82		1.19
LA CARBOB	2.22		0.95		2.03		1.24
LA CARB diesel	1.99		0.97		1.89		1.30
Market Indicators (dollars per barrel)
WTI	$	66.17	$	28.00	$	62.22	$	36.82
MEH	66.90		—		63.26		—
LLS	—		30.39		—		38.95
ANS	68.51		30.57		64.85		40.72
Crack Spreads:
Mid-Continent WTI 3-2-1	$	12.30	$	4.72	$	10.10	6.05
USGC MEH 3-2-1	7.96		—		7.32		—
USGC LLS 3-2-1	—		2.75		—		4.60
West Coast ANS 3-2-1	13.42		7.44		12.05		10.04
Blended 3-2-1(a)	10.79		4.62		9.38		6.45
Crude Oil Differentials:
Sweet	$	(0.27)	$	(1.70)	$	(0.64)	$	(1.20)
Sour	(3.09)		(3.78)		(3.10)		(4.34)

(a)    Blended 3-2-1 Mid-Continent/USGC/West Coast crack spread is 40/40/20 percent in 2021. Blended 3-2-1 Mid-Continent/USGC/West Coast crack spread is 38/38/24 percent in 2020. These blends are based on our refining capacity by region in each period. Beginning in the first quarter of 2021, the prompt price for USGC was transitioned from LLS to MEH.

Second Quarter 2021 Compared to Second Quarter 2020

Refining & Marketing segment revenues increased $17.19 billion primarily due to increased average refined product sales prices of $1.06 per gallon and increased refined product sales volume of 611 mbpd.

Net refinery throughputs increased 578 mbpd during the second quarter of 2021, primarily due to continuing industry recovery from the impact of COVID-19 in 2020.

Refining & Marketing segment income from operations increased $1.77 billion primarily due to higher blended crack spreads and reduced refining planned turnaround and refining operating costs.

Refining & Marketing margin was $12.45 per barrel for the second quarter of 2021 compared to $7.64 per barrel for the second quarter of 2020. Refining & Marketing margin is affected by our performance against the market indicators shown earlier, which use spot market values and an estimated mix of crude purchases and product sales. Based on the market indicators and our crude oil throughput, we estimate a net positive impact of approximately $1.3 billion on Refining & Marketing margin for the second quarter of 2021 compared to the second quarter of 2020, primarily due to higher crack spreads. Our reported Refining & Marketing margin differs from market indicators due to the mix of crudes purchased and their costs, the effect of market structure on our crude oil acquisition prices, the effect of RIN prices on the crack spread, and other items like refinery yields, other feedstock variances and fuel margin from sales to direct dealers. These factors had an estimated net positive effect of approximately $300 million on Refining & Marketing segment income in the second quarter of 2021 compared to the second quarter of 2020.

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For the three months ended June 30, 2021, refining operating costs, excluding depreciation and amortization, decreased $77 million, or $1.54 per barrel, compared to the three months ended June 30, 2020 as we took actions to reduce costs in response to the economic effects of COVID-19, including idling portions of our refining capacity. The per barrel cost also decreased as a result of higher throughputs during the quarter.

Distribution costs, excluding depreciation and amortization, increased $94 million and include fees paid to MPLX of $866 million and $841 million for the second quarter of 2021 and 2020, respectively. On a per barrel basis, distribution costs, excluding depreciation and amortization, decreased $0.83 per barrel as increased costs were offset by higher throughput.

Refining planned turnaround costs decreased $101 million, or $0.54 per barrel, due to the timing of turnaround activity.

Depreciation and amortization decreased $0.44 per barrel primarily due to higher throughput.

Six Months Ended June 30, 2021 Compared to Six Months Ended June 30, 2020

Refining & Marketing segment revenues increased $17.57 billion primarily due to increased average refined product sales prices of $0.63 per gallon and higher refined product sales volumes, which increased 46 mbpd.

Net refinery throughputs increased 75 mbpd in the first six months of 2021, primarily due to continuing industry recovery from the impact of COVID-19 in 2020.

Refining & Marketing segment loss from operations decreased $1.67 billion primarily driven by higher blended crack spreads and reduced refining operating and refining planned turnaround costs, partially offset by narrower sweet and sour differentials.

Refining & Marketing margin was $11.37 per barrel for the first six months of 2021 compared to $10.04 per barrel for the first six months of 2020. Refining & Marketing margin is affected by the market indicators shown earlier, which use spot market values and an estimated mix of crude purchases and product sales. Based on the market indicators and our crude oil throughput, we estimate a net positive impact of approximately $700 million on Refining & Marketing margin for the first six months of 2021 compared to the first six months of 2020, primarily due to higher crack spreads partially offset by narrower sweet and sour differentials. Our reported Refining & Marketing margin differs from market indicators due to the mix of crudes purchased and their costs, market structure on our crude oil acquisition prices, RIN prices on the crack spread, and other items like refinery yields, other feedstock variances and direct dealer fuel margin. These factors had an estimated net positive effect of approximately $100 million on Refining & Marketing segment income in the first six months of 2021 compared to the first six months of 2020.

For the six months ended June 30, 2021, refining operating costs, excluding depreciation and amortization and the winter storm effect, decreased $525 million, or $1.20 per barrel, compared to the six months ended June 30, 2020 as we took actions to reduce costs in response to the economic effects of COVID-19, including idling portions of our refining capacity.

Distribution costs, excluding depreciation and amortization, were $2.51 billion in both periods and include fees paid to MPLX of $1.71 billion and $1.70 billion for the first six months of 2021 and 2020, respectively. On a per barrel basis, distribution costs, excluding depreciation and amortization, decreased $0.12 per barrel due to higher throughput.

Refining planned turnaround costs decreased $318 million, or $0.67 per barrel, due to the timing of turnaround activity.

Depreciation and amortization decreased $0.02 per barrel as increased costs were offset by higher throughput.

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Supplemental Refining & Marketing Statistics

	Three Months Ended  June 30,		Six Months Ended  June 30,
	2021	2020	2021	2020
Refining & Marketing Operating Statistics
Crude oil capacity utilization percent(a)	94	71	89	81
Refinery throughputs (mbpd):
Crude oil refined	2,713	2,165	2,548	2,475
Other charge and blendstocks	141	111	162	160
Net refinery throughput	2,854	2,276	2,710	2,635
Sour crude oil throughput percent	48	53	48	50
Sweet crude oil throughput percent	52	47	52	50
Refined product yields (mbpd):
Gasoline	1,436	1,114	1,380	1,301
Distillates	984	834	933	927
Propane	54	45	50	52
Feedstocks and petrochemicals	301	217	262	284
Heavy fuel oil	27	27	31	32
Asphalt	91	76	94	78
Total	2,893	2,313	2,750	2,674
Refined product export sales volumes (mbpd)(b)	231	219	237	301

(a)Based on calendar-day capacity, which is an annual average that includes down time for planned maintenance and other normal operating activities.

(b)Represents fully loaded export cargoes for each time period. These sales volumes are included in the total sales volume amounts.

Midstream

The following includes key financial and operating data for the second quarter of 2021 compared to the second quarter of 2020 and the six months ended June 30, 2021 compared to the six months ended June 30, 2020.

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(a)On owned common-carrier pipelines, excluding equity method investments.

(b)Includes amounts related to unconsolidated equity method investments on a 100 percent basis.

	Three Months Ended  June 30,				Six Months Ended  June 30,
Benchmark Prices	2021		2020		2021		2020
Natural Gas NYMEX HH ($ per MMBtu)	$	2.97	$	1.76	$	2.85	$	1.81
C2 + NGL Pricing ($ per gallon)(a)	$	0.75	$	0.34	$	0.74	$	0.37

(a)C2 + NGL pricing based on Mont Belvieu prices assuming an NGL barrel of approximately 35 percent ethane, 35 percent propane, 6 percent iso-butane, 12 percent normal butane and 12 percent natural gasoline.

Second Quarter 2021 Compared to Second Quarter 2020

Midstream segment revenue and segment income from operations increased $336 million and $108 million, respectively. Results for the quarter benefited from higher revenue, primarily due to higher pipeline and terminal throughputs and higher natural gas prices, in addition to lower operating expenses.

Six Months Ended June 30, 2021 Compared to Six Months Ended June 30, 2020

Midstream segment revenue and segment income from operations increased $424 million and $175 million, respectively. Results benefited from higher revenue, primarily due to higher pipeline and terminal throughputs and higher natural gas prices, in addition to lower operating expenses in the first six months of 2021.

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Corporate

Key Financial Information (in millions)	Three Months Ended  June 30,				Six Months Ended  June 30,
	2021		2020		2021		2020
Corporate(a)	$	(180)	$	(195)	$	(337)	$	(428)

(a)Corporate costs consist primarily of MPC’s corporate administrative expenses and costs related to certain non-operating assets, except for corporate overhead expenses attributable to MPLX, which are included in the Midstream segment.

Second Quarter 2021 Compared to Second Quarter 2020

Corporate costs decreased $15 million largely due to cost reductions realized from our 2020 workforce reduction and other cost control efforts.

Six Months Ended June 30, 2021 Compared to Six Months Ended June 30, 2020

Corporate costs decreased $91 million largely due to cost reductions realized from our 2020 workforce reduction and other cost control efforts.

Items not Allocated to Segments

Key Financial Information (in millions)	Three Months Ended  June 30,				Six Months Ended  June 30,
	2021		2020		2021		2020
Items not allocated to segments:
Transaction-related costs(a)	$	—	$	—	$	—	$	(8)
Impairments	(56)		(25)		(56)		(9,162)
LCM inventory valuation adjustment	—		1,470		—		(1,715)
Total items not allocated to segments:	(56)		1,445		(56)		(10,885)

(a)2020 includes costs incurred in connection with the Midstream strategic review. Costs incurred in 2020 in connection with the Speedway separation are included in discontinued operations. See Note 4 to the unaudited consolidated financial statements for additional information on discontinued operations.

Second Quarter 2021 Compared to Second Quarter 2020

Total items not allocated to segments included impairment expense of $56 million in the second quarter of 2021. During the second quarter of 2020, we recognized an LCM benefit of $1.47 billion and impairment expense of $25 million.

Six Months Ended June 30, 2021 Compared to Six Months Ended June 30, 2020

Total items not allocated to segments included impairment expense of $56 million in the first six months of 2021. During the first six months of 2020, we recorded impairment charges of approximately $9.16 billion, which includes $7.85 billion related to goodwill and long-lived assets and $1.32 billion related to equity method investments, and an LCM charge of $1.72 billion primarily driven by the effects of COVID-19 and the decline in commodity prices.

Items not allocated to segments also include transaction-related costs of $8 million for the first six months of 2020 associated with the Midstream strategic review and other related activities.

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Non-GAAP Financial Measure

Management uses a financial measure to evaluate our operating performance that is calculated and presented on the basis of a methodology other than in accordance with GAAP. We believe this non-GAAP financial measure is useful to investors and analysts to assess our ongoing financial performance because, when reconciled to its most comparable GAAP financial measure, it provides improved comparability between periods through the exclusion of certain items that we believe are not indicative of our core operating performance and that may obscure our underlying business results and trends. This measure should not be considered a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP, and our calculation thereof may not be comparable to similarly titled measures reported by other companies. The non-GAAP financial measure we use is as follows:

Refining & Marketing Margin

Refining & Marketing margin is defined as sales revenue less the cost of refinery inputs and purchased products and excludes other items as reflected in the table below.

Reconciliation of Refining & Marketing income from operations to Refining & Marketing gross margin and Refining & Marketing margin

	Three Months Ended  June 30,				Six Months Ended  June 30,
(in millions)	2021		2020		2021		2020
Refining & Marketing income (loss) from operations(a)	$	224	$	(1,544)	$	(374)	$	(2,041)
Plus (Less):
Selling, general and administrative expenses	499		502		955		1,058
LCM inventory valuation adjustment	—		1,470		—		(1,715)
(Income) loss from equity method investments	(14)		19		(19)		22
Net gain on disposal of assets	—		1		(3)		1
Other income	(89)		(4)		(143)		(8)
Refining & Marketing gross margin	620		444		416		(2,683)
Plus (Less):
Operating expenses (excluding depreciation and amortization)	2,305		2,240		4,580		5,073
LCM inventory valuation adjustment	—		(1,470)		—		1,715
Depreciation and amortization	466		463		944		936
Gross margin excluded from Refining & Marketing margin(b)	(198)		(75)		(377)		(184)
Other income included in Refining & Marketing margin	82		—		82		—
Other taxes included in Refining & Marketing margin	(42)		(19)		(66)		(43)
Refining & Marketing margin(a)	3,233		1,583		5,579		4,814

(a)LCM inventory valuation adjustments are excluded from Refining & Marketing income from operations and Refining & Marketing margin.

(b)Reflects the gross margin, excluding depreciation and amortization, of other related operations included in the Refining & Marketing segment and processing of credit card transactions on behalf of certain of our marketing customers.

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LIQUIDITY AND CAPITAL RESOURCES

Cash Flows

Our consolidated cash and cash equivalents balance for continuing operations was approximately $11.84 billion at June 30, 2021 compared to $415 million at December 31, 2020. Cash and cash equivalents for discontinued operations was $140 million at December 31, 2020. Net cash provided by (used in) operating activities, investing activities and financing activities are presented in the following table.

	Six Months Ended  June 30,
(In millions)	2021		2020
Net cash provided by (used in):
Operating activities	$	1,834	$	(230)
Investing activities	15,403		(2,077)
Financing activities	(5,954)		1,871
Total increase (decrease) in cash	$	11,283	$	(436)

Net cash provided by operating activities increased $2.06 billion in the first six months of 2021 compared to the first six months of 2020, primarily due to a favorable change in working capital of $1.31 billion when comparing the change in working capital in both periods and an increase in operating results. Changes in working capital exclude changes in short-term debt. The favorable continuing operations changes were partially offset by a decrease in cash provided by discontinued operations of $757 million which reflect the results of the Speedway business. The decrease in cash provided by discontinued operating cash flows is due to tax payments related to the gain on sale and working capital changes.

Changes in working capital, excluding changes in short-term debt, were a net $347 million use of cash in the first six months of 2021 compared to a net $1.66 billion use of cash in the first six months of 2020.

For the first six months of 2021, changes in working capital were a net $347 million use of cash primarily due to the effects of increasing energy commodity prices and volumes at the end of the period on working capital. Accounts payable increased primarily due to increases in crude prices and volumes. Current receivables increased primarily due to higher crude and refined product prices and volumes. Inventories increased primarily due to increases in refined product and crude inventories.

For the first six months of 2020, changes in working capital, excluding the LCM reserve and changes in short-term debt, were a net $1.66 billion use of cash primarily due to the effects of decreasing energy commodity prices and volumes at the end of the period on working capital. Accounts payable decreased primarily due to decreases in crude prices and volumes. Current receivables decreased primarily due to lower crude and refined product prices and volumes. Excluding the LCM reserve, inventories decreased due to decreases in crude and refined product inventories.

Net cash provided by investing activities was $15.40 billion in the first six months of 2021 compared to net cash used in investing activities of $2.08 billion in the first six months of 2020. The change from 2020 is primarily due to proceeds from the sale of Speedway of $21.38 billion and a decrease in additions to property, plant and equipment of $1.09 billion, partially offset by purchases of short-term investments of $5.42 billion.

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The consolidated statements of cash flows exclude changes to the consolidated balance sheets that did not affect cash. A reconciliation of additions to property, plant and equipment per the consolidated statements of cash flows to reported total capital expenditures and investments follows.

	Six Months Ended  June 30,
(In millions)	2021		2020
Additions to property, plant and equipment per the consolidated statements of cash flows	$	606	$	1,696
Decrease in capital accruals	(19)		(338)
Total capital expenditures	587		1,358
Investments in equity method investees (excludes acquisitions)	113		383
Total capital expenditures and investments	$	700	$	1,741

Financing activities were a net $5.95 billion use of cash in the first six months of 2021 compared to a net $1.87 billion source of cash in the first six months of 2020.

•MPC borrowed $7.41 billion and repaid $8.44 billion under its commercial paper program in the first six months of 2021.

•Long-term debt borrowings and repayments were a net $2.28 billion use of cash in the first six months of 2021 compared to a net $3.26 billion source of cash in the first six months of 2020. During the first six months of 2021, MPC repaid $1.3 billion of senior notes, borrowed and repaid $3.65 billion under its revolving credit facility and borrowed and repaid $4.65 billion under its trade receivables facility. MPLX redeemed $750 million of senior notes and had net payments of $175 million under its revolving credit facility. During the first six months of 2020, MPC issued $2.5 billion of senior notes, borrowed and repaid $3.5 billion under its revolving credit facility, borrowed and repaid $1.18 billion under its trade receivables facility and MPLX had net borrowings of $825 million under its revolving credit facility.

•Cash used in common stock repurchases, including fees and expenses, totaled $984 million in the first six months of 2021. See the “Capital Requirements” section for further discussion of our stock repurchases.

•Repurchases of noncontrolling interests were $310 million in the first six months of 2021 related to the repurchase of MPLX common units. See Note 5 to the unaudited consolidated financial statements for further discussion of MPLX.

Derivative Instruments

See Item 3. Quantitative and Qualitative Disclosures about Market Risk for a discussion of derivative instruments and associated market risk.

Capital Resources

MPC, Excluding MPLX

We control MPLX through our ownership of the general partner, however, the creditors of MPLX do not have recourse to MPC’s general credit through guarantees or other financial arrangements. The assets of MPLX can only be used to settle its own obligations and its creditors have no recourse to our assets. Therefore, in the following table, we present the liquidity of MPC, excluding MPLX. MPLX liquidity is discussed in the following section.

Our liquidity, excluding MPLX, totaled $22.35 billion at June 30, 2021 consisting of:

	June 30, 2021
(In millions)	Total Capacity		Outstanding Borrowings		Available Capacity
Bank revolving credit facility(a)	$	5,000	$	1	$	4,999
Trade receivables facility	100		—		100
Total	$	5,100	$	1	$	5,099
Cash and cash equivalents and short-term investments(b)					17,249
Total liquidity					$	22,348

(a)Outstanding borrowings include $1 million in letters of credit outstanding under this facility.

(b)Excludes cash and cash equivalents of MPLX of $8 million.

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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 $21.38 billion. This transaction resulted in a pretax gain of $11.68 billion ($8.02 billion after income taxes) after deducting the book value of the net assets and certain other adjustments. We utilized a portion of the Speedway sale proceeds to structurally reduce debt and the remaining proceeds are included in our liquidity as cash and cash equivalents and short-term investments.

Because of the alternatives available to us, including internally generated cash flow and access to capital markets and a commercial paper program, we believe that our short-term and long-term liquidity is adequate to fund not only our current operations, but also our near-term and long-term funding requirements, including capital spending programs, the repurchase of shares of our common stock, dividend payments, defined benefit plan contributions, repayment of debt maturities and other amounts that may ultimately be paid in connection with contingencies.

Effective June 18, 2021, we terminated our $1.0 billion unsecured 364-day revolving credit facility due in September 2021 and on June 23, 2021, we reduced the capacity under our trade receivables securitization facility from $750 million to $100 million. The trade receivables securitization facility expired in July of 2021, however, we plan to secure a new $100 million trade receivable facility in the third quarter of 2021.

Additionally, nearly all of our tax refund of approximately $2.1 billion is expected to be received during the second half of 2021. We are working with the IRS to facilitate the refund, but we do not control the timing of the payment.

We have a commercial paper program that allows us to have a maximum of $2.0 billion in commercial paper outstanding. We do not intend to have outstanding commercial paper borrowings in excess of available capacity under our bank revolving credit facility. At June 30, 2021, we had no borrowings outstanding under the commercial paper program.

The MPC credit agreement contains and our trade receivables facility contained representations and warranties, affirmative and negative covenants and events of default that we consider usual and customary for agreements of these types. The financial covenant included in the MPC credit agreement requires us to maintain, as of the last day of each fiscal quarter, a ratio of Consolidated Net Debt to Total Capitalization (as defined in the MPC credit agreements) of no greater than 0.65 to 1.00. As of June 30, 2021, we were in compliance with the covenants contained in the MPC bank revolving credit facility and our trade receivables facility, including the financial covenant with a ratio of Consolidated Net Debt to Total Capitalization of less than 0.00 to 1.00.

Our intention is to maintain an investment-grade credit profile. As of June 30, 2021, the credit ratings on our senior unsecured debt are as follows.

 

Company	Rating Agency	Rating
MPC	Moody’s	Baa2 (stable outlook)
	Standard & Poor’s	BBB (negative outlook)
	Fitch	BBB (stable outlook)

The ratings reflect the respective views of the rating agencies. Although it is our intention to maintain a credit profile that supports an investment-grade rating, there is no assurance that these ratings will continue for any given period of time. The ratings may be revised or withdrawn entirely by the rating agencies if, in their respective judgments, circumstances so warrant.

The MPC credit agreement does not contain credit rating triggers that would result in the acceleration of interest, principal or other payments in the event that our credit ratings are downgraded. However, any downgrades of our senior unsecured debt could increase the applicable interest rates, yields and other fees payable thereunder and may limit our flexibility to obtain financing in the future, including to refinance existing indebtedness. In addition, a downgrade of our senior unsecured debt rating to below investment-grade levels could, under certain circumstances, impact our ability to purchase crude oil on an unsecured basis and could result in us having to post letters of credit under existing transportation services or other agreements.

See Note 19 to the unaudited consolidated financial statements for further discussion of our debt.

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MPLX

MPLX’s liquidity totaled $4.52 billion at June 30, 2021 consisting of:

	June 30, 2021
(In millions)	Total Capacity		Outstanding Borrowings		Available Capacity
MPLX LP - bank revolving credit facility	$	3,500	$	—	$	3,500
MPC intercompany loan agreement	1,500		493		1,007
Total	$	5,000	$	493	$	4,507
Cash and cash equivalents					8
Total liquidity					$	4,515

On August 4, 2021, MPLX announced the intent to provide notice of the redemption of all of the $1 billion outstanding aggregate principal amount of MPLX's LIBOR plus 1.100% per annum floating rate senior notes due September 9, 2022. The notes are expected to be redeemed on September 3, 2021, at a price equal to 100% of the principal amount thereof, plus accrued and unpaid interest to, but not including, the redemption date. MPLX expects to fund the redemption amount with a combination of cash on hand and borrowings under the MPLX credit agreement or the MPC intercompany loan agreement.

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. The financial covenant 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 during the six-month period following certain acquisitions). Consolidated EBITDA is subject to adjustments for certain acquisitions completed and capital projects undertaken during the relevant period. Other covenants restrict MPLX and/or certain of its subsidiaries from incurring debt, creating liens on assets and entering into transactions with affiliates. As of June 30, 2021, MPLX was in compliance with the covenants, including the financial covenant with a ratio of Consolidated Total Debt to Consolidated EBITDA of 3.7 to 1.0.

Our intention is to maintain an investment-grade credit profile for MPLX. As of June 30, 2021, the credit ratings on MPLX’s senior unsecured debt are as follows.

 

Company	Rating Agency	Rating
MPLX	Moody’s	Baa2 (stable outlook)
	Standard & Poor’s	BBB (negative outlook)
	Fitch	BBB (stable outlook)

The ratings reflect the respective views of the rating agencies. Although it is our intention to maintain a credit profile that supports an investment-grade rating for MPLX, there is no assurance that these ratings will continue for any given period of time. The ratings may be revised or withdrawn entirely by the rating agencies if, in their respective judgments, circumstances so warrant.

The agreements governing MPLX’s debt obligations do not contain credit rating triggers that would result in the acceleration of interest, principal or other payments in the event that MPLX credit ratings are downgraded. However, any downgrades of MPLX senior unsecured debt to below investment grade ratings could increase the applicable interest rates, yields and other fees payable under such agreements. In addition, a downgrade of MPLX senior unsecured debt ratings to below investment-grade levels may limit MPLX’s ability to obtain future financing, including to refinance existing indebtedness.

See Item 8. Financial Statements and Supplementary Data – Note 19 for further discussion of MPLX’s debt.

Capital Requirements

Capital Investment Plan

MPC's capital investment plan for 2021 totals approximately $1.4 billion for capital projects and investments, excluding capitalized interest, potential acquisitions and MPLX’s capital investment plan. MPC’s capital investment plan includes all of the planned capital spending for Refining & Marketing and Corporate, as well as a portion of the planned capital investments in Midstream and Speedway’s capital spending through the close of the sale on May 14, 2021, which is now reported separately as discontinued operations. The remainder of the planned capital spending for Midstream reflects the capital investment plan for MPLX, which totals $1.0 billion, excluding project reimbursements paid by MPC to MPLX and return of capital from MPLX’s joint venture partners. We continuously evaluate our capital investment plan and make changes as conditions warrant.

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Capital expenditures and investments for MPC and MPLX are summarized below.

	Six Months Ended  June 30,
(In millions)	2021		2020
Capital expenditures and investments:(a)
MPC continuing operations, excluding MPLX
Refining & Marketing	$	310	$	741
Midstream - Other	36		158
Corporate and Other(b)	44		45
Total MPC continuing operations, excluding MPLX	$	390	$	944
MPC discontinued operations - Speedway	$	177	$	131
Midstream - MPLX	$	280	$	741

(a)    Capital expenditures exclude changes in capital accruals.

(b)    Excludes capitalized interest of $30 million and $56 million for the six months ended June 30, 2021 and 2020, respectively.

Capital expenditures and investments in affiliates during the six months ended June 30, 2021, were primarily for Refining & Marketing and Midstream segment projects. Major Refining & Marketing projects include the conversion of the Martinez facility from refining petroleum to manufacturing renewable fuels and the South Texas Asset Repositioning (“STAR”) project intended to optimize operations and reduce costs at our Galveston Bay refinery, in addition to other projects that we expect will help us reduce future operating costs.

Major Midstream projects include increasing processing capacity at a gas processing plant in the Marcellus region, which was placed in service, the Whistler natural gas pipeline, which began full commercial service, the Wink to Webster crude oil pipeline and the reversal of the Capline crude pipeline.

Other Capital Requirements

During the six months ended June 30, 2021, we contributed $226 million to our funded pension plans. We may choose to make additional contributions to our pension plans.

On July 28, 2021, our board of directors approved a dividend of $0.58 per share on common stock. The dividend is payable September 10, 2021, to shareholders of record as of the close of business on August 18, 2021.

As of June 30, 2021, $77 million of restructuring expenses were accrued as restructuring reserves in our consolidated balance sheet. We expect cash payments for the remaining exit and disposal costs reserve to occur through 2024.

We may, from time to time, repurchase our senior notes in the open market, in tender offers, in privately-negotiated transactions or otherwise in such volumes, at such prices and upon such other terms as we deem appropriate.

Share Repurchases

In connection with the Speedway sale, our board of directors approved an additional $7.1 billion share repurchase authorization bringing total share repurchase authorizations to $10.0 billion prior to the June tender of shares discussed below.

On June 15, 2021, MPC completed a modified Dutch auction tender offer, purchasing 15,573,365 shares of its common stock at a purchase price of $63.00 per share, for an aggregate purchase price of approximately $981 million, excluding fees and expenses related to the tender offer. As of June 30, 2021, MPC has $9.02 billion remaining under its share repurchase authorization.

Since January 1, 2012, our board of directors has approved $25.05 billion in total share repurchase authorizations and we have repurchased a total of $16.03 billion of our common stock.

51

During the six months ended June 30, 2021, 11,929,998 MPLX common units were repurchased at an average cost per unit of $26.02. Total cash paid for units repurchased during the six months ended June 30, 2021 was $310 million. As of June 30, 2021, MPLX had agreements to acquire 126,293 additional common units for $4 million, which settled in early July 2021. As of June 30, 2021, $657 million remained available under the authorization for future unit repurchases.

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 discontinued at any time.

Contractual Cash Obligations

As of June 30, 2021, our contractual cash obligations included long-term debt, capital and operating lease obligations, purchase obligations and other long-term liabilities. During the first six months of 2021, our long-term debt commitments decreased approximately $3.97 billion primarily due to the repayment of $1.3 billion of MPC senior notes, net repayment of $1.0 billion under the MPC commercial paper program, the redemption of $750 million of MPLX senior notes and net repayment of $175 million under the MPLX revolving credit facility.

During the quarter, we terminated a transportation services agreement with a total commitment of approximately $560 million through the year 2028. There were no other material changes to our contractual cash obligations outside the ordinary course of business since December 31, 2020.

Off-Balance Sheet Arrangements

Off-balance sheet arrangements comprise those arrangements that may potentially impact our liquidity, capital resources and results of operations, even though such arrangements are not recorded as liabilities under U.S. GAAP. Our off-balance sheet arrangements are limited to indemnities and guarantees that are described below. Although these arrangements serve a variety of our business purposes, we are not dependent on them to maintain our liquidity and capital resources, and we are not aware of any circumstances that are reasonably likely to cause the off-balance sheet arrangements to have a material adverse effect on our liquidity and capital resources.

We have provided various guarantees related to equity method investees. These arrangements are described in Note 24 to the unaudited consolidated financial statements.

ENVIRONMENTAL MATTERS AND COMPLIANCE COSTS

We have incurred and may continue to incur substantial capital, operating and maintenance, and remediation expenditures as a result of environmental laws and regulations. If these expenditures, as with all costs, are not ultimately reflected in the prices of our products and services, our operating results will be adversely affected. We believe that substantially all of our competitors must comply with similar environmental laws and regulations. However, the specific impact on each competitor may vary depending on a number of factors, including the age and location of its operating facilities, marketing areas, production processes and whether it is also engaged in the petrochemical business or the marine transportation of crude oil and refined products.

There have been no significant changes to our environmental matters and compliance costs during the six months ended June 30, 2021.

CRITICAL ACCOUNTING ESTIMATES

As of June 30, 2021, there have been no significant changes to our critical accounting estimates since our Annual Report on Form 10-K for the year ended December 31, 2020.

ACCOUNTING STANDARDS NOT YET ADOPTED

We have not identified any recent accounting pronouncements that are expected to have a material impact on our financial condition, results of operations or cash flows upon adoption.

52

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

For a detailed discussion of our risk management strategies and our derivative instruments, see Item 7A. Quantitative and Qualitative Disclosures about Market Risk in our Annual Report on Form 10-K for the year ended December 31, 2020.

See Notes 17 and 18 to the unaudited consolidated financial statements for more information about the fair value measurement of our derivatives, as well as the amounts recorded in our consolidated balance sheets and statements of income. We do not designate any of our commodity derivative instruments as hedges for accounting purposes.

The following table includes the composition of net gains and losses on our commodity derivative positions as of June 30, 2021 and 2020, respectively.

	Six Months Ended  June 30,
(In millions)	2021		2020
Realized gain (loss) on settled derivative positions	$	(172)	$	147
Unrealized loss on open net derivative positions	(76)		(44)
Net gain (loss)	$	(248)	$	103

See Note 18 to the unaudited consolidated financial statements for additional information on our open derivative positions at June 30, 2021.

Sensitivity analysis of the effects on income from operations (“IFO”) of hypothetical 10 percent and 25 percent increases and decreases in commodity prices for open commodity derivative instruments as of June 30, 2021 is provided in the following table.

	Change in IFO from a Hypothetical Price Increase of				Change in IFO from a Hypothetical Price Decrease of
(In millions)	10%		25%		10%		25%
As of June 30, 2021
Crude	$	(29)	$	(74)	$	30	$	74
Refined products	(33)		(82)		33		82
Blending products	(15)		(37)		15		37
Soybean oil	(19)		(47)		19		47
Embedded derivatives	(10)		(25)		10		25

We remain at risk for possible changes in the market value of commodity derivative instruments; however, such risk should be mitigated by price changes in the underlying physical commodity. Effects of these offsets are not reflected in the above sensitivity analysis.

We evaluate our portfolio of commodity derivative instruments on an ongoing basis and add or revise strategies in anticipation of changes in market conditions and in risk profiles. Changes to the portfolio after June 30, 2021 would cause future IFO effects to differ from those presented above.

Sensitivity analysis of the effect of a hypothetical 100-basis-point change in interest rates on long-term debt, including the portion classified as current and excluding finance leases, as of June 30, 2021 is provided in the following table. Fair value of cash and cash equivalents, receivables, accounts payable and accrued interest approximate carrying value and are relatively insensitive to changes in interest rates due to the short-term maturity of the instruments. Accordingly, these instruments are excluded from the table.

53

(In millions)	Fair Value as of June 30, 2021(a)		Change in Fair Value(b)		Change in Net Income for the Six Months Ended June 30, 2021(c)
Long-term debt
Fixed-rate	$	30,782	$	2,784	n/a
Variable-rate	1,000		12		14

(a)Fair value was based on market prices, where available, or current borrowing rates for financings with similar terms and maturities.

(b)Assumes a 100-basis-point decrease in the weighted average yield-to-maturity at June 30, 2021.

(c)Assumes a 100-basis-point change in interest rates. The change to net income was based on the weighted average balance of debt outstanding for the six months ended June 30, 2021.

At June 30, 2021, our portfolio of long-term debt was comprised of fixed-rate and variable-rate instruments. The fair value of our fixed-rate debt is relatively sensitive to interest rate fluctuations. Our sensitivity to interest rate declines and corresponding increases in the fair value of our debt portfolio unfavorably affects our results of operations and cash flows only when we elect to repurchase or otherwise retire fixed-rate debt at prices above carrying value. Interest rate fluctuations generally do not impact the fair value of borrowings under our variable-rate debt, but may affect our results of operations and cash flows.

See Note 17 to the unaudited consolidated financial statements for additional information on the fair value of our debt.

ITEM 4. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

An evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934, as amended) was carried out under the supervision and with the participation of our management, including our chief executive officer and chief financial officer. Based upon that evaluation, the chief executive officer and chief financial officer concluded that the design and operation of these disclosure controls and procedures were effective as of June 30, 2021, the end of the period covered by this report.

Changes in Internal Control over Financial Reporting

During the quarter ended June 30, 2021, there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

54

PART II – OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

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. While it is possible that an adverse result in one or more of the lawsuits or proceedings in which we are a defendant could be material to us, based upon current information and our experience as a defendant in other matters, we believe that these lawsuits and proceedings, individually or in the aggregate, will not have a material adverse effect on our consolidated results of operations, financial position or cash flows.

Item 103 of Regulation S-K promulgated by the SEC requires disclosure of certain environmental matters when a governmental authority is a party to the proceedings and such proceedings involve potential monetary sanctions, unless we reasonably believe that the matter will result in no monetary sanctions, or in monetary sanctions, exclusive of interest and costs, of less than $300,000.

Except as described below, there have been no material changes to the matters previously disclosed in our Annual Report on Form 10-K, as updated in our Quarterly Report on Form 10-Q for the quarter ended March 31, 2021.

Dakota Access Pipeline

In connection with MPLX’s 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, MPLX entered into a Contingent Equity Contribution Agreement. MPLX, 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.

In March 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 conduct a full environmental impact statement (“EIS”), and further requested briefing on whether an easement necessary for the operation of the Bakken Pipeline system should be vacated while the EIS is being prepared.

On July 6, 2020, the D.D.C. ordered vacatur of the easement to cross Lake Oahe during the pendency of an EIS and further ordered a shut down of the pipeline by August 5, 2020. The D.D.C. denied a motion to stay that order. Dakota Access and the Army Corps appealed the D.D.C.’s orders to the U.S. Court of Appeals for the District of Columbia Circuit (the “Court of Appeals”). On July 14, 2020, the Court of Appeals issued an administrative stay while the court considered Dakota Access and the Army Corps’ emergency motion for stay pending appeal. On August 5, 2020, the Court of Appeals stayed the D.D.C.’s injunction that required the pipeline be shutdown and emptied of oil by August 5, 2020. The Court of Appeals denied a stay of the D.D.C.’s March order, which required the EIS, and further denied a stay of the D.D.C.’s July order, which vacated the easement. On January 26, 2021, the Court of Appeals upheld the D.D.C.’s order vacating the easement while the Army Corps prepares the EIS. The Court of Appeals reversed the D.D.C.’s order to the extent it directed that the pipeline be shutdown and emptied of oil. On May 21, 2021, the D.D.C. denied a renewed request for an injunction. On June 22, 2021, the D.D.C. issued an order dismissing without prejudice the tribes’ claims against Dakota Access. The judge noted that the plaintiffs may move to reopen the case in the event of a violation of the court’s prior orders. The pipeline remains operational.

If the pipeline is temporarily shut down pending completion of the EIS, 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. It is expected that MPLX would 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 one percent redemption premium required pursuant to the indenture governing the notes) and any accrued and unpaid interest. As of June 30, 2021, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement were approximately $230 million.

ITEM 1A. RISK FACTORS

There have been no material changes from the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2020.

55

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table sets forth a summary of our purchases during the quarter ended June 30, 2021, of equity securities that are registered by MPC pursuant to Section 12 of the Securities Exchange Act of 1934, as amended.

Period	Total Number of Shares Purchased(a)	Average Price Paid per Share(b)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs(c)(d)
04/01/2021-04/30/2021	84,085	$	54.66	—	$	2,954,604,016
05/01/2021-05/31/2021	6,562	59.32		—	$	10,000,000,000
06/01/2021-06/30/2021	15,573,870	63.00		15,573,365	$	9,018,878,009
Total	15,664,517	62.95		15,573,365

(a)The amounts in this column include 84,085, 6,562 and 505 shares of our common stock delivered by employees to MPC, upon vesting of restricted stock, to satisfy tax withholding requirements in April, May and June, respectively.

(b)Amounts in this column reflect the weighted average price paid for shares repurchased under our share repurchase authorizations and for shares tendered to us in satisfaction of employee tax withholding obligations upon the vesting of restricted stock granted under our stock plans.

(c)On April 30, 2018, we announced that our board of directors had approved a $5 billion share repurchase authorization in addition to the remaining authorization pursuant to the May 31, 2017 announcement. On May 14, 2021, we announced that our board of directors had approved an additional $7.1 billion share repurchase authorization. These share purchase authorizations have no expiration date.

(d)In the second quarter of 2021, we used cash on hand to repurchase 15,573,365 shares of common stock under the modified Dutch auction tender offer for a total cost of $981 million, excluding fees and expenses.

56

ITEM 6. EXHIBITS

			Incorporated by Reference			Filed Herewith	Furnished Herewith
Exhibit Number	Exhibit Description	Form	Exhibit	Filing Date	SEC File No.
2.1†	Agreement and Plan of Merger, dated as of May 7, 2019, by and among Andeavor Logistics LP, Tesoro Logistics GP, LLC, MPLX LP, MPLX GP LLC and MPLX MAX LLC.	8-K	2.1	5/8/2019	001-35054
2.2†	Purchase and Sale Agreement, dated as of August 2, 2020, by and between MPC, the MPC subsidiaries party thereto and 7-Eleven, Inc.	8-K	2.1	8/3/2020	001-35054
2.3	Amendment to Purchase and Sale Agreement, dated as of October 16, 2020, by and among MPC, the MPC subsidiaries party thereto and 7-Eleven, Inc.	10-K	2.7	2/26/2021	001-35054
2.4†	Amendment No. 2 to Purchase and Sale Agreement, dated as of May 14, 2021, by and among the Company, Sellers and Purchaser	8-K	2.3	5/14/2021	001-35054
3.1	Restated Certificate of Incorporation of MPC, dated October 1, 2018	8-K	3.2	10/1/2018	001-35054
3.2	Amended and Restated Bylaws of MPC dated July 27, 2021	8-K	3.1	8/2/2021	001-35054
10.1	Marathon Petroleum Corporation 2021 Incentive Compensation Plan	8-K	10.1	5/4/2021	001-35054
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14 and 15d-14 under the Securities Exchange Act of 1934					X
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14 and 15d-14 under the Securities Exchange Act of 1934					X
32.1	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350						X
32.2	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350						X
101.INS	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded with the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document.					X
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document.					X
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document.					X
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.					X
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document.					X
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

†    The exhibits and schedules have been omitted pursuant to Item 601(b)(2) of Regulation S-K and will be provided to the Securities and Exchange Commission upon request.

57

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

August 4, 2021	MARATHON PETROLEUM CORPORATION
	By:	/s/ John J. Quaid
		John J. Quaid Senior Vice President and Controller

58

EX-31.1

Exhibit 31.1

MARATHON PETROLEUM CORPORATION

CERTIFICATION PURSUANT TO SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Michael J. Hennigan, certify that:

1.I have reviewed this report on Form 10-Q of Marathon Petroleum Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 4, 2021	/s/ Michael J. Hennigan
		Michael J. Hennigan
		President and Chief Executive Officer

EX-31.2

Exhibit 31.2

MARATHON PETROLEUM CORPORATION

CERTIFICATION PURSUANT TO SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Maryann T. Mannen, certify that:

1.I have reviewed this report on Form 10-Q of Marathon Petroleum Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 4, 2021	/s/ Maryann T. Mannen
		Maryann T. Mannen
		Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Marathon Petroleum Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael J. Hennigan, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

August 4, 2021

/s/ Michael J. Hennigan

Michael J. Hennigan

President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Marathon Petroleum Corporation (the “Company”) on Form 10-Q for the period ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Maryann T. Mannen, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

August 4, 2021

/s/ Maryann T. Mannen

Maryann T. Mannen

Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Cover [Abstract]
Entity Central Index Key	0001510295
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Amendment Flag	false
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-35054
Entity Registrant Name	Marathon Petroleum Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-1284632
Entity Address, Address Line One	539 South Main Street
Entity Address, City or Town	Findlay
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45840-3229
City Area Code	419
Local Phone Number	422-2121
Title of 12(b) Security	Common Stock, par value $.01
Trading Symbol	MPC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		638,202,178

XML

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues and other income:
Sales and other operating revenues	$ 29,615	$ 12,195	$ 52,326	$ 34,399
Income (loss) from equity method investments	93	79	184	(1,154)	[1]
Net gain on disposal of assets	0	2	3	5
Other income	119	24	196	47
Total revenues and other income	29,827	12,300	52,709	33,297
Costs and expenses:
Cost of revenues (excludes items below)	27,177	11,502	48,261	31,844
LCM inventory valuation adjustment	0	(1,470)	0	1,715
Impairment expense	0	25	0	7,847
Depreciation and amortization	871	833	1,715	1,696
Selling, general and administrative expenses	625	665	1,200	1,407
Other taxes	189	170	351	368
Total costs and expenses	28,862	11,725	51,527	44,877
Income (loss) from continuing operations	965	575	1,182	(11,580)
Net interest and other financial costs	372	341	725	673
Income (loss) from continuing operations before income taxes	593	234	457	(12,253)
Provision (benefit) for income taxes on continuing operations	5	150	39	(1,801)
Income (loss) from continuing operations, net of tax	588	84	418	(10,452)
Income from discontinued operations, net of tax	8,214	192	8,448	510
Net income (loss)	8,802	276	8,866	(9,942)
Less net income (loss) attributable to:
Redeemable noncontrolling interest	21	21	41	41
Noncontrolling interests	269	246	555	(758)
Net income (loss) attributable to MPC	$ 8,512	$ 9	$ 8,270	$ (9,225)
Basic:
Continuing operations	$ 0.46	$ (0.28)	$ (0.27)	$ (15.00)
Discontinued operations	12.63	0.29	12.98	0.79
Net income (loss) per share	$ 13.09	$ 0.01	$ 12.71	$ (14.21)
Weighted average shares outstanding	650	650	651	649
Diluted:
Continuing operations	$ 0.45	$ (0.28)	$ (0.27)	$ (15.00)
Discontinued operations	12.55	0.29	12.98	0.79
Net income (loss) per share	$ 13.00	$ 0.01	$ 12.71	$ (14.21)
Weighted average shares outstanding	654	650	651	649

[1] The three and six months ended June 30, 2021 and the six months ended June 30, 2020 includes impairment expense. See Note 6 for further information.

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income (loss)	$ 8,802	$ 276	$ 8,866	$ (9,942)
Other comprehensive income (loss)	171	(10)	172	(16)
Comprehensive income (loss)	8,973	266	9,038	(9,958)
Less comprehensive income (loss) attributable to:
Redeemable noncontrolling interest	21	21	41	41
Noncontrolling interests	269	246	555	(758)
Comprehensive income (loss) attributable to MPC	8,683	(1)	8,442	(9,241)
Actuarial changes
Other comprehensive income (loss)	183	(1)	192	3
Prior service
Other comprehensive income (loss)	(8)	(8)	(16)	(17)
Other
Other comprehensive income (loss)	$ (4)	$ (1)	$ (4)	$ (2)

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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Actuarial changes
OCI, tax expense (benefit)	$ 61	$ 0	$ 64	$ 1
Prior service
OCI, tax expense (benefit)	(2)	(3)	(5)	(6)
Other
OCI, tax expense (benefit)	$ (2)	$ (1)	$ (2)	$ (1)

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Consolidated Balance Sheets - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	[1]	$ 11,839	$ 415
Short-term investments		5,418	0
Receivables, less allowance for doubtful accounts of $44 and $18, respectively		9,771	5,760
Inventories		8,879	7,999
Other current assets		2,685	2,724
Assets held for sale		0	11,389
Total current assets		38,592	28,287
Equity method investments		5,424	5,422
Property, plant and equipment, net		37,996	39,035
Goodwill		8,256	8,256
Right of use assets		1,500	1,521
Other noncurrent assets		2,532	2,637
Total assets		94,300	85,158
Current liabilities:
Accounts payable		12,170	7,803
Payroll and benefits payable		651	732
Accrued taxes		5,219	1,105
Debt due within one year		70	2,854
Operating lease liabilities		473	497
Other current liabilities		929	822
Liabilities held for sale		0	1,850
Total current liabilities		19,512	15,663
Long-term debt		28,250	28,730
Deferred income taxes		5,704	6,203
Defined benefit postretirement plan obligations		1,850	2,121
Long-term operating lease liabilities		1,020	1,014
Deferred credits and other liabilities		1,271	1,207
Total liabilities		57,607	54,938
Commitments and contingencies (see Note 24)
Redeemable noncontrolling interest		968	968
MPC stockholders’ equity:
Preferred stock, no shares issued and outstanding (par value $0.01 per share, 30 million shares authorized)		0	0
Common stock:
Issued – 983 million and 980 million shares (par value $0.01 per share, 2 billion shares authorized)		10	10
Held in treasury, at cost – 345 million and 329 million shares		(16,147)	(15,157)
Additional paid-in capital		33,238	33,208
Retained earnings		12,160	4,650
Accumulated other comprehensive loss		(340)	(512)
Total MPC stockholders’ equity		28,921	22,199
Noncontrolling interests		6,804	7,053
Total equity		35,725	29,252
Total liabilities, redeemable noncontrolling interest and equity		$ 94,300	$ 85,158

[1] Excludes $140 million of cash at December 31, 2020, representing Speedway store cash, which was included in assets held for sale.

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts Receivable, Allowance for Credit Loss, Current	$ 44	$ 18
Preferred stock:
Preferred Stock, Shares Issued	0
Preferred Stock, Shares Outstanding	0
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred Stock, Shares Authorized	30,000,000
Common stock:
Common Stock, Shares, Issued	983,000,000	980,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Shares Authorized	2,000,000,000
Treasury Stock, Shares	(345,000,000)	(329,000,000)

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Consolidated Statements of Cash Flows - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net income (loss)		$ 8,866	$ (9,942)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of deferred financing costs and debt discount		41	30
Impairment expense		0	7,847
Depreciation and amortization		1,715	1,696
LCM inventory valuation adjustment		0	1,715
Pension and other postretirement benefits, net		(34)	102
Deferred income taxes		(49)	(529)
Net gain on disposal of assets		(3)	(5)
(Income) loss from equity method investments		(184)	1,154	[1]
Distributions from equity method investments		303	275
Income from discontinued operations		(8,448)	(510)
Changes in income tax receivable		20	(1,150)
Net recognized (gains) losses on investments and derivatives		(1)	23
Changes in operating assets and liabilities, net of effects of businesses acquired:
Current receivables		(3,947)	3,095
Inventories		(880)	415
Current accounts payable and accrued liabilities		4,477	(5,188)
Right of use assets and operating lease liabilities, net		4	0
All other, net		(79)	(48)
Cash provided by (used in) operating activities - continuing operations		1,801	(1,020)
Cash provided by operating activities - discontinued operations		33	790
Net cash provided by (used in) operating activities		1,834	(230)
Investing activities:
Additions to property, plant and equipment		(606)	(1,696)
Disposal of assets		81	58
Investments – acquisitions and contributions		(113)	(383)
Investments - redemptions, repayments and return of capital		3	118
Purchases of short-term investments		(5,417)	0
All other, net		220	19
Cash used in investing activities - continuing operations		(5,832)	(1,884)
Cash provided by (used in) investing activities - discontinued operations		21,235	(193)
Net cash provided by (used in) investing activities		15,403	(2,077)
Financing activities:
Commercial paper – issued		7,414	0
Commercial paper - repayments		(8,437)	0
Long-term debt – borrowings		10,775	9,672
Long-term debt – repayments		(13,056)	(6,388)
Debt issuance costs		0	(24)
Issuance of common stock		53	6
Common stock repurchased		(984)	0
Dividends paid		(760)	(755)
Distributions to noncontrolling interests		(613)	(620)
Repurchases of noncontrolling interests		(310)	0
All other, net		(36)	(20)
Net cash provided by (used in) financing activities		(5,954)	1,871
Net change in cash, cash equivalents and restricted cash		11,283	(436)
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning balance		416	1,395
Cash, cash equivalents, restricted cash and restricted cash equivalents, ending balance		11,839	966
Discontinued Operations, Held-for-sale
Financing activities:
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning balance	[2]	140	134
Cash, cash equivalents, restricted cash and restricted cash equivalents, ending balance	[2]	$ 0	$ 127

[1] The three and six months ended June 30, 2021 and the six months ended June 30, 2020 includes impairment expense. See Note 6 for further information.

[2] Reported as assets held for sale on our consolidated balance sheets.

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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)	(10,238)				(9,234)		(1,004)
Dividends declared on common stock	(377)				(377)
Distributions to noncontrolling interests	(300)						(300)
Other comprehensive income (loss)	(6)					(6)
Shares returned - stock based compensation			(2)
Shares issued - stock based compensation				17
Net shares issued - stock based compensation	16						1
Equity transactions of MPLX	(7)			(5)			(2)
Other	1				1		0
Ending balance at Mar. 31, 2020	31,228	10	(15,145)	33,169	6,380	(326)	7,140
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]
Other comprehensive income (loss)	(16)
Equity transactions of MPLX				3
Ending balance at Jun. 30, 2020	30,849	10	(15,149)	33,208	6,008	(336)	7,108
Beginning balance at Mar. 31, 2020	31,228	10	(15,145)	33,169	6,380	(326)	7,140
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	255				9		246
Dividends declared on common stock	(380)				(380)
Distributions to noncontrolling interests	(279)						(279)
Other comprehensive income (loss)	(10)					(10)
Shares returned - stock based compensation			(4)
Shares issued - stock based compensation				31
Net shares issued - stock based compensation	30						3
Equity transactions of MPLX	6			8			(2)
Other	(1)				(1)		0
Ending balance at Jun. 30, 2020	30,849	10	(15,149)	33,208	6,008	(336)	7,108
Beginning balance at Dec. 31, 2020	29,252	10	(15,157)	33,208	4,650	(512)	7,053
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	44				(242)		286
Dividends declared on common stock	(379)				(379)
Distributions to noncontrolling interests	(300)						(300)
Other comprehensive income (loss)	1					1
Shares returned - stock based compensation			(1)
Shares issued - stock based compensation				18
Net shares issued - stock based compensation	17						0
Equity transactions of MPLX	(124)			(4)			(120)
Ending balance at Mar. 31, 2021	28,511	10	(15,158)	33,222	4,029	(511)	6,919
Beginning balance at Dec. 31, 2020	29,252	10	(15,157)	33,208	4,650	(512)	7,053
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	172
Equity transactions of MPLX				(38)
Ending balance at Jun. 30, 2021	35,725	10	(16,147)	33,238	12,160	(340)	6,804
Beginning balance at Mar. 31, 2021	28,511	10	(15,158)	33,222	4,029	(511)	6,919
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	8,781				8,512		269
Dividends declared on common stock	(381)				(381)
Distributions to noncontrolling interests	(272)						(272)
Other comprehensive income (loss)	171					171
Shares repurchased	(984)		(984)
Shares returned - stock based compensation			(5)
Shares issued - stock based compensation				50
Net shares issued - stock based compensation	47						2
Equity transactions of MPLX	(148)			(34)			(114)
Ending balance at Jun. 30, 2021	$ 35,725	$ 10	$ (16,147)	$ 33,238	$ 12,160	$ (340)	$ 6,804

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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
Number of common shares issued - stock compensation		1
Ending balance at Mar. 31, 2020		979
Number of common shares issued - stock compensation		0
Ending balance at Jun. 30, 2020		979
Beginning balance at Dec. 31, 2020	980	980
Number of common shares issued - stock compensation		1
Ending balance at Mar. 31, 2021		981
Number of common shares issued - stock compensation		2
Ending balance at Jun. 30, 2021	983	983

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Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Shares of Treasury Stock) - shares shares in Millions	Total	Treasury Stock
Beginning balance at Dec. 31, 2019		(329)
Number of shares returned - stock compensation		0
Ending balance at Mar. 31, 2020		(329)
Number of shares returned - stock compensation		0
Ending balance at Jun. 30, 2020		(329)
Beginning balance at Dec. 31, 2020	(329)	(329)
Number of shares returned - stock compensation		0
Ending balance at Mar. 31, 2021		(329)
Number of shares repurchased		(16)
Number of shares returned - stock compensation		0
Ending balance at Jun. 30, 2021	(345)	(345)

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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 attributable to redeemable noncontrolling interest		20
Distributions to noncontrolling interests		(20)
Ending balance at Mar. 31, 2020		968
Beginning balance at Dec. 31, 2019		968
Net income attributable to redeemable noncontrolling interest	$ 41
Ending balance at Jun. 30, 2020		968
Beginning balance at Mar. 31, 2020		968
Net income attributable to redeemable noncontrolling interest	21	21
Distributions to noncontrolling interests		(21)
Ending balance at Jun. 30, 2020		968
Beginning balance at Dec. 31, 2020	968	968
Net income attributable to redeemable noncontrolling interest		20
Distributions to noncontrolling interests		(20)
Ending balance at Mar. 31, 2021		968
Beginning balance at Dec. 31, 2020	968	968
Net income attributable to redeemable noncontrolling interest	41
Ending balance at Jun. 30, 2021	968	968
Beginning balance at Mar. 31, 2021		968
Net income attributable to redeemable noncontrolling interest	21	21
Distributions to noncontrolling interests		(21)
Ending balance at Jun. 30, 2021	$ 968	$ 968

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Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per share of common stock (in dollars per share)	$ 0.58	$ 0.58	$ 0.58	$ 0.58

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Description of the Business and Basis of Presentation

6 Months Ended

Jun. 30, 2021

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 and its assets and liabilities are presented in our consolidated balance sheets as assets and liabilities held for sale as of December 31, 2020. 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 4 for discontinued operations disclosures.

Basis of Presentation

All significant intercompany transactions and accounts have been eliminated.

These interim consolidated financial statements are unaudited; however, in the opinion of our management, these statements reflect all adjustments necessary for a fair statement of the results for the periods reported. All such adjustments are of a normal, recurring nature unless otherwise disclosed. These interim consolidated financial statements, including the notes, have been prepared in accordance with the rules of the SEC applicable to interim period financial statements and do not include all of the information and disclosures required by GAAP for complete financial statements.

These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020. The results of operations for the three and six months ended June 30, 2021 are not necessarily indicative of the results to be expected for the full year.

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 revenue, 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, beginning August 2, 2020, in accordance with ASC 360, Property, Plant, and Equipment, we ceased recording depreciation and amortization for Speedway’s property, plant and equipment, finite-lived intangible assets and right of use lease assets.

During the second quarter of 2021, we invested a significant portion of the Speedway sale proceeds in investment grade debt, commercial paper and certificates of deposit with maturities greater than three months. As a result, we have updated our accounting policies for short-term investments and fair value as disclosed below:

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 of June 30, 2021 as available-for-sale securities and changes in fair market value are reported in other comprehensive income.

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. The fair value calculation for these Level 3 instruments at June 30, 2021 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.64 to $1.59 per gallon with a weighted average of $0.81 per gallon and (2) the probability of renewal of 100 percent for the first and second 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. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities.

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Accounting Standards

6 Months Ended

Jun. 30, 2021

Accounting Standards Update and Change in Accounting Principle [Abstract]

Accounting Standards

ACCOUNTING STANDARDS

Recently Adopted

We adopted the following ASU during the first six months of 2021, which did not have a material impact to our financial statements or financial statement disclosures:

ASU		Effective Date
2019-12	Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes	January 1, 2021

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Short-term Investments

6 Months Ended

Jun. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Short-term Investments

SHORT-TERM INVESTMENTS

Investments Components

The components of investments were as follows:

	June 30, 2021
(In millions)	Fair Value Level	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash and Cash Equivalents		Short-term Investments
Available-for-sale debt securities
Commercial paper	Level 2	$	8,378	$	—	$	—	$	8,378	$	3,907	$	4,471
Certificates of deposit and time deposits	Level 2	4,501		—		—		4,501		3,625		876
U.S. government securities	Level 1	50		—		—		50		50		—
Corporate notes and bonds	Level 2	248		—		—		248		177		71
Total available-for-sale debt securities		$	13,177	$	—	$	—	$	13,177	$	7,759	$	5,418
Cash								4,080		4,080		—
Total								$	17,257	$	11,839	$	5,418

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 to June 30, 2021 were not material. Realized gains/losses were not material. All of our available-for-sale debt securities held as of June 30, 2021 mature within one year or less.

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Discontinued Operations

6 Months Ended

Jun. 30, 2021

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

DISCONTINUED OPERATIONS

On May 14, 2021, we completed the sale of Speedway, our company-owned and operated retail transportation fuel and convenience store business, to 7-Eleven for cash proceeds of approximately $21.38 billion. After-tax proceeds were approximately $17.22 billion. This transaction resulted in a pretax gain of $11.68 billion ($8.02 billion after income taxes) after deducting the book value of the net assets and certain other adjustments.

The Speedway sale gain is accounted for as a discrete item within the discontinued operations income tax provision and includes a current tax provision of $4.16 billion and a deferred income tax benefit of $497 million due to the reversal of MPC’s deferred tax liabilities related to Speedway.

The proceeds and related Speedway sale gain may be adjusted in future periods based on provisions of the purchase and sale agreement that allow for adjustments of working capital amounts and other miscellaneous items subsequent to transaction closing date of May 14, 2021.

Results of operations for Speedway are reflected through the close of the sale. The following table presents Speedway results and the gain on sale as reported in income from discontinued operations, net of tax, within our consolidated statements of income.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Revenues, other income and net gain on disposal of assets:
Revenues and other income	$	3,081	$	4,147	$	8,420	$	9,706
Net gain on disposal of assets	11,682		—		11,682		1
Total revenues, other income and net gain on disposal of assets	14,763		4,147		20,102		9,707
Costs and expenses:
Cost of revenues (excludes items below)	2,748		3,524		7,654		8,480
LCM inventory valuation adjustment	—		(10)		—		25
Depreciation and amortization	1		102		3		201
Selling, general and administrative expenses	48		81		121		160
Other taxes	24		44		75		97
Total costs and expenses	2,821		3,741		7,853		8,963
Income from operations	11,942		406		12,249		744
Net interest and other financial costs	2		4		6		10
Income before income taxes	11,940		402		12,243		734
Provision for income taxes	3,726		210		3,795		224
Income from discontinued operations, net of tax	$	8,214	$	192	$	8,448	$	510

Separation Agreements

We have entered into various 15-year fuel supply agreements through which we continue to supply fuel to Speedway.

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Master Limited Partnership

6 Months Ended

Jun. 30, 2021

Noncontrolling Interest [Abstract]

Master Limited Partnership

MASTER LIMITED PARTNERSHIP

We own the general partner and a majority limited partner interest in MPLX, which owns and operates crude oil and light product transportation and logistics infrastructure as well as gathering, processing and fractionation assets. We control MPLX through our ownership of the general partner interest and, as of June 30, 2021, we owned approximately 63 percent of the outstanding MPLX common units.

Unit Repurchase Program

On November 2, 2020, MPLX announced its board authorized a unit repurchase program for the repurchase of up to $1 billion of MPLX’s outstanding common units held by the public.

During the six months ended June 30, 2021, 11,929,998 MPLX common units were repurchased at an average cost per unit of $26.02. Total cash paid for units repurchased during the six months ended June 30, 2021 was $310 million. As of June 30, 2021, MPLX had agreements to acquire 126,293 additional common units for $4 million, which settled in early July 2021. As of June 30, 2021, $657 million remained available under the authorization for future unit repurchases.

MPLX may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, tender offers, accelerated unit repurchases or open market solicitations for units, some of which may be effected through Rule 10b5-1 plans. The timing and amount of repurchases will depend upon several factors, including market and business conditions, and repurchases may be initiated, suspended or discontinued at any time. The repurchase authorization has no expiration date.

Agreements

We have various long-term, fee-based commercial agreements with MPLX. Under these agreements, MPLX provides transportation, storage, distribution and marketing services to us. With certain exceptions, these agreements generally contain minimum volume commitments. These transactions are eliminated in consolidation but are reflected as intersegment transactions between our Refining & Marketing and Midstream segments. We also have agreements with MPLX that establish fees for operational and management services provided between us and MPLX and for executive management services and certain general and administrative services provided by us to MPLX. These transactions are eliminated in consolidation but are reflected as intersegment transactions between our Corporate and Midstream segments.

Noncontrolling Interest

As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows:

	Six Months Ended  June 30,
(In millions)	2021		2020
Increase (decrease) due to issuance/(repurchase) of MPLX common units	$	(76)	$	4
Tax impact	38		(1)
Increase (decrease) in MPC's additional paid-in capital, net of tax	$	(38)	$	3

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Impairments

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Impairments

IMPAIRMENTS

In the second quarter of 2021, we recognized impairment expense within our Midstream segment related to the anticipated divestiture and 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.

The table below provides information related to the impairments recognized, along with the location of these impairments within consolidated statement of income.

		Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	Income Statement Line	2021		2020		2021		2020
Goodwill	Impairment expense	$	—	$	—	$	—	$	7,330
Equity method investments	Income (loss) from equity method investments	13		—		13		1,315
Long-lived assets	Impairment expense	—		25		—		517
Long-lived assets	Depreciation and amortization	43		—		43		—
Total impairments		$	56	$	25	$	56	$	9,162

Goodwill

During the first quarter of 2020, we recorded an impairment of goodwill of $7.33 billion. The $5.516 billion goodwill impairment within the Refining & Marketing segment was primarily driven by the effects of COVID-19 and the decline in commodity prices. The $1.814 billion impairment within the Midstream segment was primarily driven by additional information related to the slowing of drilling activity, which had reduced production growth forecasts from MPLX’s producer customers. 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.

Equity Method Investments

During the first quarter of 2020, we recorded equity method investment impairment charges totaling $1.315 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 was determined based upon applying the discounted cash flow method, an income approach.

Long-lived Assets

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 COVID-19 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 in the first quarter of 2020 to impairment expense on the consolidated statements of income.

During the first quarter of 2020, we 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 COVID-19. 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. We 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 related to its property, plant and equipment and intangibles, which are included in impairment expense on our consolidated statements of income.

Fair values of property, plant and equipment were determined using a combination of income and cost approaches. The income approach utilized significant assumptions including management’s best estimates of the expected future cash flows and the estimated useful life of the asset groups. The cost approach utilized assumptions for the current replacement costs of similar assets adjusted for estimated depreciation and deterioration of the existing equipment and economic obsolescence. The fair value of the intangibles was determined based on applying the multi-period excess earnings method, which is an income approach.

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Variable Interest Entities

6 Months Ended

Jun. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entities

VARIABLE INTEREST ENTITIES

Consolidated VIE

We control MPLX through our ownership of its general partner. MPLX is a VIE because the limited partners do not have substantive kick-out or participating rights over the general partner. We are the primary beneficiary of MPLX because in addition to our significant economic interest, we also have the ability, through our ownership of the general partner, to control the decisions that most significantly impact MPLX. We therefore consolidate MPLX and record a noncontrolling interest for the interest owned by the public. We also record a redeemable noncontrolling interest related to MPLX’s Series A preferred units.

The creditors of MPLX do not have recourse to MPC’s general credit through guarantees or other financial arrangements, except as noted. MPC has effectively guaranteed certain indebtedness of LOOP LLC (“LOOP”) and LOCAP LLC (“LOCAP”), in which MPLX holds an interest. See Note 24 for more information. The assets of MPLX can only be used to settle their own obligations and their creditors have no recourse to our assets, except as noted earlier.

The following table presents balance sheet information for the assets and liabilities of MPLX, which are included in our balance sheets.

(In millions)	June 30, 2021		December 31, 2020
Assets
Cash and cash equivalents	$	8	$	15
Receivables, less allowance for doubtful accounts	546		478
Inventories	126		118
Other current assets	46		67
Assets held for sale	—		188
Equity method investments	4,033		4,036
Property, plant and equipment, net	20,352		21,418
Goodwill	7,657		7,657
Right of use assets	297		309
Other noncurrent assets	958		1,006
Liabilities
Accounts payable	$	495	$	468
Payroll and benefits payable	6		4
Accrued taxes	83		76
Debt due within one year	1		764
Operating lease liabilities	63		63
Liabilities held for sale	—		101
Other current liabilities	298		297
Long-term debt	19,234		19,375
Deferred income taxes	11		12
Long-term operating lease liabilities	232		244
Deferred credits and other liabilities	507		437

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Related Party Transactions

6 Months Ended

Jun. 30, 2021

Related Party Transactions [Abstract]

Related Party Transactions

RELATED PARTY TRANSACTIONS

Transactions with related parties were as follows:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Sales to related parties	$	11	$	20	$	54	$	50
Purchases from related parties	219		158		422		353

Sales to related parties, which are included in sales and other operating revenues, consist primarily of refined product sales to certain of our equity affiliates.

Purchases from related parties are included in cost of revenues. We obtain utilities, transportation services and purchase ethanol from certain of our equity affiliates.

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Earnings (Loss) per Share

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Earnings (Loss) per Share

EARNINGS (LOSS) 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 stock-based compensation awards, provided the effect is not anti-dilutive.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions, except per share data)	2021		2020		2021		2020
Income (loss) from continuing operations, net of tax	$	588	$	84	$	418	$	(10,452)
Less: Net income (loss) attributable to noncontrolling interest	290		267		596		(717)
Net income allocated to participating securities	—		—		—		—
Income (loss) from continuing operations available to common stockholders	298		(183)		(178)		(9,735)
Income from discontinued operations, net of tax	8,214		192		8,448		510
Income (loss) available to common stockholders	$	8,512	$	9	$	8,270	$	(9,225)
Weighted average common shares outstanding:
Basic	650		650		651		649
Effect of dilutive securities	4		—		—		—
Diluted	654		650		651		649
Income (loss) available to common stockholders per share:
Basic:
Continuing operations	$	0.46	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.63		0.29		12.98		0.79
Net income (loss) per share	$	13.09	$	0.01	$	12.71	$	(14.21)
Diluted:
Continuing operations	$	0.45	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.55		0.29		12.98		0.79
Net income (loss) per share	$	13.00	$	0.01	$	12.71	$	(14.21)

The following table summarizes the shares that were anti-dilutive and, therefore, were excluded from the diluted share calculation.

	Three Months Ended  June 30,		Six Months Ended  June 30,
(In millions)	2021	2020	2021	2020
Shares issuable under stock-based compensation plans	3	9	8	11

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Equity

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Equity

EQUITY

In connection with the Speedway sale, our board of directors approved an additional $7.1 billion share repurchase authorization bringing total share repurchase authorizations to $10.0 billion prior to the June tender of shares discussed below. The authorization has no expiration date.

We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, tender offers, accelerated share repurchases or open market solicitations for shares, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be discontinued at any time.

On June 15, 2021, MPC completed a modified Dutch auction tender offer, purchasing 15,573,365 shares of its common stock at a purchase price of $63.00 per share, for an aggregate purchase price of approximately $981 million, excluding fees and expenses related to the tender offer. As of June 30, 2021, MPC has $9.02 billion remaining under its share repurchase authorizations.

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Segment Information

6 Months Ended

Jun. 30, 2021

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 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 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 and to independent entrepreneurs who operate primarily Marathon® branded outlets, 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.

Segment income represents income (loss) from operations attributable to the reportable segments. Corporate consists primarily of MPC’s corporate administrative expenses and costs related to certain non-operating assets, except for corporate overhead expenses attributable to MPLX, which are included in the Midstream segment. In addition, certain items that affect comparability (as determined by the chief operating decision maker (“CODM”)) are not allocated to the reportable segments. 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.

The following reconciles segment income (loss) from operations to income (loss) from continuing operations before income taxes as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	224	$	(1,544)	$	(374)	$	(2,041)
Midstream	977		869		1,949		1,774
Segment income (loss) from operations	1,201		(675)		1,575		(267)
Corporate	(180)		(195)		(337)		(428)
Items not allocated to segments:
Transaction-related costs(a)	—		—		—		(8)
Impairments(b)	(56)		(25)		(56)		(9,162)
LCM inventory valuation adjustment	—		1,470		—		(1,715)
Income (loss) from continuing operations	965		575		1,182		(11,580)
Net interest and other financial costs	372		341		725		673
Income (loss) from continuing operations before income taxes	$	593	$	234	$	457	$	(12,253)

(a)Includes costs incurred in connection with the Midstream strategic review. Costs incurred in connection with the Speedway separation are included in discontinued operations. See Note 4.

(b)Includes impairment of goodwill, equity method investments and long lived assets. See Note 6 for additional information.

The following reconciles segment depreciation and amortization to total depreciation and amortization as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	466	$	463	$	944	$	936
Midstream	331		330		665		675
Segment depreciation and amortization	797		793		1,609		1,611
Corporate	74		40		106		85
Total depreciation and amortization	$	871	$	833	$	1,715	$	1,696

The following reconciles segment revenues to sales and other operating revenues as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing
Revenues from external customers(a)	$	28,554	$	11,387	$	50,215	$	32,671
Intersegment revenues	30		4		58		29
Refining & Marketing segment revenues	28,584		11,391		50,273		32,700
Midstream
Revenues from external customers(a)	1,061		808		2,111		1,728
Intersegment revenues	1,248		1,165		2,447		2,406
Midstream segment revenues	2,309		1,973		4,558		4,134
Total segment revenues	30,893		13,364		54,831		36,834
Less: intersegment revenues	1,278		1,169		2,505		2,435
Sales and other operating revenues	$	29,615	$	12,195	$	52,326	$	34,399

(a)Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 4 and 8 for additional information.

The following reconciles segment capital expenditures and investments to total capital expenditures:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	176	$	271	$	310	$	741
Midstream	178		425		316		899
Segment capital expenditures and investments	354		696		626		1,640
Less investments in equity method investees	62		214		113		383
Plus:
Corporate	23		18		44		45
Capitalized interest	16		27		30		56
Total capital expenditures(a)	$	331	$	527	$	587	$	1,358

(a)Includes changes in capital expenditure accruals. See Note 21 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2021 and 2020 as reported in the consolidated statements of cash flows.

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Net Interest and Other Financial Costs

6 Months Ended

Jun. 30, 2021

Other Income and Expenses [Abstract]

Net Interest and Other Financial Costs

NET INTEREST AND OTHER FINANCIAL COSTS

Net interest and other financial costs were as follows:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Interest income	$	(2)	$	(2)	$	(3)	$	(8)
Interest expense	337		371		688		726
Interest capitalized	(19)		(34)		(36)		(71)
Pension and other postretirement non-service costs(a)	56		(1)		56		(4)
Other financial costs	—		7		20		30
Net interest and other financial costs	$	372	$	341	$	725	$	673

(a)See Note 23.

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Income Taxes

6 Months Ended

Jun. 30, 2021

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

We recorded a combined federal, state and foreign income tax provision of $5 million and $39 million for the three and six months ended June 30, 2021, respectively, which was lower than the tax computed at the U.S. statutory rate primarily due to permanent tax differences related to income attributable to noncontrolling interests.

We recorded a combined federal, state and foreign income tax provision of $150 million for the three months ended June 30, 2020, which was higher than the tax computed at the U.S. statutory rate primarily due to impacts attributable to noncontrolling interests, state taxes and the tax rate differential resulting from the expected net operating loss (“NOL”) carryback provided under the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”). We recorded a combined federal, state and foreign income tax benefit of $1,801 million for the six months ended June 30, 2020, which was lower than the tax computed at the U.S. statutory rate primarily due to a significant amount of our pre-tax loss consisting of non-tax deductible goodwill impairment charges, partially offset by the tax rate differential resulting from the expected 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 those ownership interests is paid by those interests, but this benefit was lower for the six months ended June 30, 2020 due to impairment charges recorded by MPLX.

A reconciliation of the continuing operations tax provision (benefit) in dollars as determined using the federal statutory income tax rate applied to income (loss) before income taxes to the provision (benefit) for income taxes is shown in the table below.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Tax computed at statutory rate	$	125	$	49	$	96	$	(2,573)
State and local income taxes, net of federal income tax effects	13		28		22		(216)
Goodwill impairment	—		—		—		1,157
Noncontrolling interests	(100)		43		(69)		144
Legislation(a)	(23)		18		(17)		(325)
Unrecognized tax benefits	2		—		16		—
Other	(12)		12		(9)		12
Total provision (benefit) for income tax from continuing operations	$	5	$	150	$	39	$	(1,801)

(a)2020 reflects the impact of the CARES Act.

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 when tax was previously paid in the carryback years. As provided by the NOL carryback statute in the CARES Act, as of June 30, 2021, we have recorded an income tax receivable of $2.1 billion in other current assets. This reflects our estimate of the refund of previously paid tax and we expect to receive nearly all of the refund during the second half of 2021. We are working with the Internal Revenue Service (“IRS”) to facilitate the refund, but we do not control the timing of this payment.

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Inventories

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

(In millions)	June 30, 2021		December 31, 2020
Crude oil	$	2,780	$	2,588
Refined products	5,178		4,478
Materials and supplies	921		933
Total	$	8,879	$	7,999

Inventories are carried at the lower of cost or market value. Costs of crude oil and refined products are aggregated on a consolidated basis for purposes of assessing whether the LIFO cost basis of these inventories may have to be written down to market values.

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Property, Plant and Equipment

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

PROPERTY, PLANT AND EQUIPMENT

	June 30, 2021						December 31, 2020
(In millions)	Gross PP&E		Accumulated Depreciation		Net PP&E		Gross PP&E		Accumulated Depreciation		Net PP&E
Refining & Marketing	$	30,573	$	14,086	$	16,487	$	30,306	$	13,257	$	17,049
Midstream	27,832		6,820		21,012		27,677		6,217		21,460
Corporate	1,389		892		497		1,356		830		526
Total	$	59,794	$	21,798	$	37,996	$	59,339	$	20,304	$	39,035

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Restructuring

6 Months Ended

Jun. 30, 2021

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 have settled 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.

(In millions)	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	(32)		(16)		(48)
Restructuring reserve balance at March 31, 2021	$	6	$	87	$	93
Cash payments	(5)		(11)		(16)
Restructuring reserve balance at June 30, 2021	$	1	$	76	$	77

(a)The restructuring reserve was zero until the third quarter of 2020.

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Fair Value Measurements

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

Fair Values—Recurring

The following tables present assets and liabilities accounted for at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 by fair value hierarchy level. We have elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty, including any related cash collateral as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the following tables.

	June 30, 2021
	Fair Value Hierarchy
(In millions)	Level 1		Level 2		Level 3		Netting and Collateral(a)		Net Carrying Value on Balance Sheet(b)		Collateral Pledged Not Offset
Assets:
Commodity contracts	$	340	$	1	$	—	$	(336)	$	5	$	74
Liabilities:
Commodity contracts	$	376	$	6	$	—	$	(382)	$	—	$	—
Embedded derivatives in commodity contracts	—		—		102		—		102		—

	December 31, 2020
	Fair Value Hierarchy
(In millions)	Level 1		Level 2		Level 3		Netting and Collateral(a)		Net Carrying Value on Balance Sheet(b)		Collateral Pledged Not Offset
Assets:
Commodity contracts	$	82	$	6	$	—	$	(80)	$	8	$	31
Liabilities:
Commodity contracts	$	81	$	10	$	—	$	(91)	$	—	$	—
Embedded derivatives in commodity contracts	—		—		63		—		63		—

(a)Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2021, cash collateral of $46 million was netted with the mark-to-market derivative liabilities. As of December 31, 2020, cash collateral of $11 million was netted with mark-to-market derivative liabilities.

(b)We have no derivative contracts that are subject to master netting arrangements reflected gross on the balance sheet.

The following is a reconciliation of the beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Beginning balance	$	66	$	45	$	63	$	60
Unrealized and realized (gains) losses included in net income	39		7		45		(7)
Settlements of derivative instruments	(3)		(1)		(6)		(2)
Ending balance	$	102	$	51	$	102	$	51
The amount of total losses (gains) for the period included in earnings attributable to the change in unrealized losses (gains) relating to assets still held at the end of period:	$	39	$	6	$	41	$	(7)

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 fixed and floating rate 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 $27.9 billion and $31.5 billion at June 30, 2021, respectively, and approximately $31.1 billion and $34.9 billion at December 31, 2020, respectively. These carrying and fair values of our debt exclude the unamortized issuance costs which are netted against our total debt.

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Derivatives

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

DERIVATIVES

For further information regarding the fair value measurement of derivative instruments, including any effect of master netting agreements or collateral, see Note 17. We do not designate any of our commodity derivative instruments as hedges for accounting purposes.

Derivatives that are not designated as accounting hedges may include commodity derivatives used to hedge price risk on (1) inventories, (2) fixed price sales of refined products, (3) the acquisition of foreign-sourced crude oil, (4) the acquisition of ethanol for blending with refined products, (5) the sale of NGLs, (6) the purchase of natural gas and (7) the purchase of soybean oil.

The following table presents the fair value of derivative instruments as of June 30, 2021 and December 31, 2020 and the line items in the balance sheets in which the fair values are reflected. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under the terms of our master netting arrangements including cash collateral on deposit with, or received from, brokers. We offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements when a legal right of offset exists. As a result, the asset and liability amounts below will not agree with the amounts presented in our consolidated balance sheets.

(In millions)	June 30, 2021				December 31, 2020
Balance Sheet Location	Asset		Liability		Asset		Liability
Commodity derivatives
Other current assets	$	341	$	382	$	88	$	91
Other current liabilities(a)	—		14		—		7
Deferred credits and other liabilities(a)	—		88		—		56

(a)     Includes embedded derivatives.

The table below summarizes open commodity derivative contracts for crude oil, refined products and blending products as of June 30, 2021.

	Percentage of contracts that expire next quarter	Position
(Units in thousands of barrels)		Long	Short
Exchange-traded(a)
Crude oil	64.2%	32,507	37,899
Refined products	87.6%	19,615	23,055
Blending products	64.9%	2,624	5,055
Soybean oil	92.8%	1,702	1,838

(a)    Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 60 long and 1,460 short; Refined products - 380 long and 210 short; Blending products - 135 short

The following table summarizes the effect of all commodity derivative instruments in our consolidated statements of income: 

	Gain (Loss)
(In millions)	Three Months Ended  June 30,				Six Months Ended  June 30,
Income Statement Location	2021		2020		2021		2020
Sales and other operating revenues	$	(5)	$	(7)	$	(15)	$	77
Cost of revenues	(168)		(105)		(233)		26
Total	$	(173)	$	(112)	$	(248)	$	103

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Debt

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Debt

DEBT Our outstanding borrowings at June 30, 2021 and December 31, 2020 consisted of the following:

(In millions)	June 30, 2021		December 31, 2020
Marathon Petroleum Corporation:
Commercial paper	$	—	$	1,024
Senior notes	8,549		9,849
Notes payable	1		1
Finance lease obligations	602		634
Total	$	9,152	$	11,508
MPLX LP:
Bank revolving credit facility	—		175
Senior notes	19,600		20,350
Finance lease obligations	9		11
Total	$	19,609	$	20,536
Total debt	$	28,761	$	32,044
Unamortized debt issuance costs	(144)		(154)
Unamortized (discount) premium, net	(297)		(306)
Amounts due within one year	(70)		(2,854)
Total long-term debt due after one year	$	28,250	$	28,730

Available Capacity under our Credit Facilities as of June 30, 2021

(Dollars in millions)	Total Capacity		Outstanding Borrowings		Outstanding Letters of Credit		Available Capacity		Weighted Average Interest Rate		Expiration
MPC, excluding MPLX
MPC bank revolving credit facility	$	5,000	$	—	$	1	$	4,999	—	%	October 2023
MPC trade receivables securitization facility	100		—		—		100		—		July 2021
MPLX
MPLX bank revolving credit facility	3,500		—		—		3,500		—	%	July 2024

MPC 364-Day Bank Revolving Credit Facilities

In February 2021, we elected to terminate our $1 billion unsecured 364-day revolving credit facility due in April 2021. This facility provided us with additional liquidity and financial flexibility during the then ongoing commodity price and demand downturn. There were no borrowings under this credit facility, and we determined that the incremental borrowing capacity of the facility was no longer necessary. We do not intend to replace this facility. We incurred no early termination fees as a result of the early termination of this credit agreement.

Effective June 18, 2021, we terminated our $1 billion unsecured 364-day revolving credit facility due in September 2021. There were no borrowings under this credit facility, and we determined that the incremental borrowing capacity of the facility was no longer necessary.

Trade Receivables Securitization Facility

On June 23, 2021, we reduced the capacity under our trade receivables securitization facility from $750 million to $100 million as we determined the incremental borrowing capacity of the facility was no longer necessary. This facility expired on July 16, 2021.

MPC Senior Notes

On March 1, 2021, we repaid the $1 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.

MPLX Senior Notes

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.

On August 4, 2021, MPLX announced the intent to provide notice of the redemption of all of the $1 billion outstanding aggregate principal amount of MPLX's LIBOR plus 1.100% per annum floating rate senior notes due September 9, 2022. The notes are expected to be redeemed on September 3, 2021, at a price equal to 100 percent of the principal amount thereof, plus accrued and unpaid interest to, but not including, the redemption date. MPLX expects to fund the redemption amount with a combination of cash on hand and borrowings under the MPLX credit agreement or the MPC intercompany loan agreement.

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Revenue

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

The following table presents our revenues from external customers disaggregated by segment and product line.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing:
Refined products	$	26,528	$	10,268	$	46,337	$	30,537
Crude oil	1,866		1,003		3,312		1,878
Services and other	160		116		566		256
Total revenues from external customers	28,554		11,387		50,215		32,671
Midstream:
Refined products	304		123		586		294
Services and other	757		685		1,525		1,434
Total revenues from external customers	1,061		808		2,111		1,728
Sales and other operating revenues	$	29,615	$	12,195	$	52,326	$	34,399

We do not disclose information on the future performance obligations for any contract with expected duration of one year or less at inception. As of June 30, 2021, we do not have future performance obligations that are material to future periods.

Receivables

On the accompanying consolidated balance sheets, receivables, less allowance for doubtful accounts primarily consists of customer receivables. Significant, non-customer balances included in our receivables at June 30, 2021 include matching buy/sell receivables of $3.84 billion.

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Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2021

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

SUPPLEMENTAL CASH FLOW INFORMATION

	Six Months Ended  June 30,
(In millions)	2021		2020
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$	649	$	601
Net income taxes paid to taxing authorities(a)	319		6

(a)Includes income tax payments related to continuing and discontinued operations.

(In millions)	June 30, 2021		December 31, 2020
Cash and cash equivalents(a)	$	11,839	$	415
Restricted cash(b)	—		1
Cash, cash equivalents and restricted cash	$	11,839	$	416

(a)Excludes $140 million of cash at December 31, 2020, representing Speedway store cash, which was included in assets held for sale.

(b)The restricted cash balance is included within other current assets on the consolidated balance sheets.

The consolidated statements of cash flows exclude changes to the consolidated balance sheets that did not affect cash. The following is a reconciliation of additions to property, plant and equipment to total capital expenditures:

	Six Months Ended  June 30,
(In millions)	2021		2020
Additions to property, plant and equipment per the consolidated statements of cash flows	$	606	$	1,696
Decrease in capital accruals	(19)		(338)
Total capital expenditures	$	587	$	1,358

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Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Accumulated Other Comprehensive Loss

ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table shows the changes in accumulated other comprehensive loss by component. Amounts in parentheses indicate debits.

(In millions)	Pension Benefits		Other Benefits		Gain on Cash Flow Hedge		Workers Compensation		Total
Balance as of December 31, 2019	$	(212)	$	(116)	$	1	$	7	$	(320)
Other comprehensive loss before reclassifications, net of tax of $(4)	(10)		(2)		—		—		(12)
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(23)		—		—		—		(23)
– actuarial loss(a)	18		1		—		—		19
– settlement loss(a)	1		—		—		—		1
Other	—		—		—		(3)		(3)
Tax effect	1		—		—		1		2
Other comprehensive loss	(13)		(1)		—		(2)		(16)
Balance as of June 30, 2020	$	(225)	$	(117)	$	1	$	5	$	(336)

(In millions)	Pension Benefits		Other Benefits		Gain on Cash Flow Hedge		Workers Compensation		Total
Balance as of December 31, 2020	$	(338)	$	(181)	$	1	$	6	$	(512)
Other comprehensive gain (loss) before reclassifications, net of tax of $44	132		1		—		(4)		129
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(23)		1		—		—		(22)
– actuarial loss(a)	24		5		—		—		29
– settlement loss(a)	49		—		—		—		49
Tax effect	(11)		(2)		—		—		(13)
Other comprehensive income (loss)	171		5		—		(4)		172
Balance as of June 30, 2021	$	(167)	$	(176)	$	1	$	2	$	(340)

(a)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 23.

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Pension and Other Postretirement Benefits

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Pension and Other Postretirement Plans

PENSION AND OTHER POSTRETIREMENT BENEFITS

The following summarizes the components of net periodic benefit costs:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Pension Benefits
Service cost	$	72	$	77	$	148	$	140
Interest cost	23		23		46		48
Expected return on plan assets	(29)		(31)		(62)		(65)
Amortization – prior service credit	(12)		(11)		(23)		(22)
– actuarial loss	14		9		25		17
– settlement loss	49		1		49		1
Net periodic pension benefits cost	$	117	$	68	$	183	$	119
Other Benefits
Service cost	$	7	$	9	$	17	$	18
Interest cost	8		8		15		16
Amortization – prior service cost	—		—		1		—
– actuarial loss	3		—		5		1
Net periodic other benefits cost	$	18	$	17	$	38	$	35

The components of net periodic benefit cost other than the service cost component are included in net interest and other financial costs on the consolidated statements of income.

During the six months ended June 30, 2021, we made contributions of $226 million to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $14 million and $24 million, respectively, during the six months ended June 30, 2021.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2021

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 both June 30, 2021 and December 31, 2020, accrued liabilities for remediation totaled $397 million. It is not presently possible to estimate the ultimate amount of all remediation costs that might be incurred or the penalties, if any, that may be imposed. Receivables for recoverable costs from certain states, under programs to assist companies in clean-up efforts related to underground storage tanks at presently or formerly owned or operated retail marketing sites, were $6 million and $7 million at June 30, 2021 and December 31, 2020, respectively.

Governmental and other entities in various states have filed lawsuits against 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.

Other Legal Proceedings

In early 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 covered the rights of way for 23 tracts of land and demanded the immediate cessation of pipeline operations. The notification also assessed trespass damages of approximately $187 million. THPP appealed this determination, which triggered an automatic stay of the requested pipeline shutdown and payment. On October 29, 2020, the Assistant Secretary - Indian Affairs issued an order vacating the BIA’s trespass order and requiring the Regional Director for the BIA Great Plains Region to issue a new decision on or before December 15, 2020 covering all 34 tracts at issue. On December 15, 2020, the Regional Director of the BIA issued a new trespass notice to THPP consistent with the Assistant Secretary - Indian Affairs order vacating the prior trespass order. The new order found that THPP was in trespass and assessed trespass damages of approximately $4 million (including interest), which has been paid. The order also required THPP to immediately cease and desist use of the portion of the pipeline that crosses the property at issue. THPP has complied with the Regional Director’s December 15, 2020 notice. On February 12, 2021, landowners filed suit in the U.S. District Court for the District of North Dakota (the “District of North Dakota”) against THPP, the Department of the Interior, the Assistant Secretary - Indian Affairs, the Interior Board of Indian Appeals and the BIA, requesting, among other things, that decisions by the Assistant Secretary - Indian Affairs and the Interior Board of Indian Appeals be vacated as to the award of damages to plaintiffs. In March 2021, THPP received a copy of an order purporting to vacate all orders related to THPP’s alleged trespass issued by the BIA between July 2, 2020 and January 14, 2021. The order directs the Regional Director of the BIA to reconsider the issue of THPP’s alleged trespass and issue a new order, if necessary, after all interested parties have had an opportunity to be heard. Subsequently, landowners voluntarily dismissed the suit filed in the District of North Dakota. On April 23, 2021, THPP filed a lawsuit in the District of North Dakota against the United States of America, the U.S. Department of the Interior and the BIA challenging the March order purporting to vacate all previous orders related to THPP’s alleged trespass.

MPLX continues to work towards a settlement of this matter with holders of the property rights at issue. Management does not believe the ultimate resolution of this matter will have a material adverse effect on our consolidated financial position, results of operations, or cash flows.

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 have a material adverse effect on our consolidated financial position, results of operations or cash flows.

Guarantees

We have provided certain guarantees, direct and indirect, of the indebtedness of other companies. Under the terms of most of these guarantee arrangements, we would be required to perform should the guaranteed party fail to fulfill its obligations under the specified arrangements. In addition to these financial guarantees, we also have various performance guarantees related to specific agreements.

Guarantees related to indebtedness of equity method investees

LOOP and LOCAP

MPC and MPLX hold interests in an offshore oil port, LOOP, and MPLX holds an interest in a crude oil pipeline system, LOCAP. Both LOOP and LOCAP have secured various project financings with throughput and deficiency agreements. Under the agreements, MPC, as a shipper, is required to advance funds if the investees are unable to service their debt. Any such advances are considered prepayments of future transportation charges. The duration of the agreements varies but tends to follow the terms of the underlying debt, which extend through 2037. Our maximum potential undiscounted payments under these agreements for the debt principal totaled $171 million as of June 30, 2021.

Dakota Access Pipeline

In connection with MPLX’s 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, MPLX entered into a Contingent Equity Contribution Agreement. MPLX, 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.

In March 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 conduct a full environmental impact statement (“EIS”), and further requested briefing on whether an easement necessary for the operation of the Bakken Pipeline system should be vacated while the EIS is being prepared.

On July 6, 2020, the D.D.C. ordered vacatur of the easement to cross Lake Oahe during the pendency of an EIS and further ordered a shut down of the pipeline by August 5, 2020. The D.D.C. denied a motion to stay that order. Dakota Access and the Army Corps appealed the D.D.C.’s orders to the U.S. Court of Appeals for the District of Columbia Circuit (the “Court of Appeals”). On July 14, 2020, the Court of Appeals issued an administrative stay while the court considered Dakota Access and the Army Corps’ emergency motion for stay pending appeal. On August 5, 2020, the Court of Appeals stayed the D.D.C.’s injunction that required the pipeline be shutdown and emptied of oil by August 5, 2020. The Court of Appeals denied a stay of the D.D.C.’s March order, which required the EIS, and further denied a stay of the D.D.C.’s July order, which vacated the easement. On January 26, 2021, the Court of Appeals upheld the D.D.C.’s order vacating the easement while the Army Corps prepares the EIS. The Court of Appeals reversed the D.D.C.’s order to the extent it directed that the pipeline be shutdown and emptied of oil. On May 21, 2021, the D.D.C. denied a renewed request for an injunction. On June 22, 2021, the D.D.C. issued an order dismissing without prejudice the tribes’ claims against Dakota Access. The judge noted that the plaintiffs may move to reopen the case in the event of a violation of the court’s prior orders. The pipeline remains operational.

If the pipeline is temporarily shut down pending completion of the EIS, 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. It is expected that MPLX would 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 one percent redemption premium required pursuant to the indenture governing the notes) and any accrued and unpaid interest. As of June 30, 2021, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement were approximately $230 million.

Crowley Ocean Partners LLC and Crowley Blue Water Partners LLC

In connection with our 50 percent indirect interest in Crowley Ocean Partners LLC, we have agreed to conditionally guarantee our portion of the obligations of the joint venture and its subsidiaries under a senior secured term loan agreement. The term loan agreement provides for loans of up to $325 million to finance the acquisition of four product tankers. MPC’s liability under the guarantee for each vessel is conditioned upon the occurrence of certain events, including if we cease to maintain an investment grade credit rating or the charter for the relevant product tanker ceases to be in effect and is not replaced by a charter with an investment grade company on certain defined commercial terms. As of June 30, 2021, our maximum potential undiscounted payments under this agreement for debt principal totaled $114 million.

In connection with our 50 percent indirect interest in Crowley Blue Water Partners LLC, we have agreed to provide a conditional guarantee of up to 50 percent of its outstanding debt balance in the event there is no charter agreement in place with an investment grade customer for the entity’s three vessels as well as other financial support in certain circumstances. As of June 30, 2021, our maximum potential undiscounted payments under this arrangement was $111 million.

Other guarantees

We have entered into other guarantees with maximum potential undiscounted payments totaling $99 million as of June 30, 2021, which primarily consist of a commitment to contribute cash to an equity method investee for certain catastrophic events, in lieu of procuring insurance coverage, a commitment to fund a share of the bonds issued by a government entity for construction of public utilities in the event that other industrial users of the facility default on their utility payments and leases of assets containing general lease indemnities and guaranteed residual values.

Contractual Commitments and Contingencies

At June 30, 2021, our contractual commitments to acquire property, plant and equipment and advance funds to equity method investees totaled $562 million.

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 with us if there are significant delays that are not due to force majeure.

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Description of the Business and Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Use of estimates

These interim consolidated financial statements are unaudited; however, in the opinion of our management, these statements reflect all adjustments necessary for a fair statement of the results for the periods reported. All such adjustments are of a normal, recurring nature unless otherwise disclosed. These interim consolidated financial statements, including the notes, have been prepared in accordance with the rules of the SEC applicable to interim period financial statements and do not include all of the information and disclosures required by GAAP for complete financial statements.

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 of June 30, 2021 as available-for-sale securities and changes in fair market value are reported in other comprehensive income.

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. The fair value calculation for these Level 3 instruments at June 30, 2021 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.64 to $1.59 per gallon with a weighted average of $0.81 per gallon and (2) the probability of renewal of 100 percent for the first and second 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. Unobservable inputs used in the models are significant to the fair values of the assets and liabilities.

Inventories

Inventories are carried at the lower of cost or market value. Costs of crude oil and refined products are aggregated on a consolidated basis for purposes of assessing whether the LIFO cost basis of these inventories may have to be written down to market values.

Derivative instruments

Derivatives that are not designated as accounting hedges may include commodity derivatives used to hedge price risk on (1) inventories, (2) fixed price sales of refined products, (3) the acquisition of foreign-sourced crude oil, (4) the acquisition of ethanol for blending with refined products, (5) the sale of NGLs, (6) the purchase of natural gas and (7) the purchase of soybean oil.

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Short-term Investments (Tables)

6 Months Ended

Jun. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities

The components of investments were as follows:

	June 30, 2021
(In millions)	Fair Value Level	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash and Cash Equivalents		Short-term Investments
Available-for-sale debt securities
Commercial paper	Level 2	$	8,378	$	—	$	—	$	8,378	$	3,907	$	4,471
Certificates of deposit and time deposits	Level 2	4,501		—		—		4,501		3,625		876
U.S. government securities	Level 1	50		—		—		50		50		—
Corporate notes and bonds	Level 2	248		—		—		248		177		71
Total available-for-sale debt securities		$	13,177	$	—	$	—	$	13,177	$	7,759	$	5,418
Cash								4,080		4,080		—
Total								$	17,257	$	11,839	$	5,418

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Discontinued Operations (Tables)

6 Months Ended

Jun. 30, 2021

Discontinued Operations and Disposal Groups [Abstract]

Condensed Income Statement

Results of operations for Speedway are reflected through the close of the sale. The following table presents Speedway results and the gain on sale as reported in income from discontinued operations, net of tax, within our consolidated statements of income.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Revenues, other income and net gain on disposal of assets:
Revenues and other income	$	3,081	$	4,147	$	8,420	$	9,706
Net gain on disposal of assets	11,682		—		11,682		1
Total revenues, other income and net gain on disposal of assets	14,763		4,147		20,102		9,707
Costs and expenses:
Cost of revenues (excludes items below)	2,748		3,524		7,654		8,480
LCM inventory valuation adjustment	—		(10)		—		25
Depreciation and amortization	1		102		3		201
Selling, general and administrative expenses	48		81		121		160
Other taxes	24		44		75		97
Total costs and expenses	2,821		3,741		7,853		8,963
Income from operations	11,942		406		12,249		744
Net interest and other financial costs	2		4		6		10
Income before income taxes	11,940		402		12,243		734
Provision for income taxes	3,726		210		3,795		224
Income from discontinued operations, net of tax	$	8,214	$	192	$	8,448	$	510

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Master Limited Partnership (Tables)

6 Months Ended

Jun. 30, 2021

Noncontrolling Interest [Abstract]

Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net

As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows:

	Six Months Ended  June 30,
(In millions)	2021		2020
Increase (decrease) due to issuance/(repurchase) of MPLX common units	$	(76)	$	4
Tax impact	38		(1)
Increase (decrease) in MPC's additional paid-in capital, net of tax	$	(38)	$	3

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Impairments (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Details of Impairments

The table below provides information related to the impairments recognized, along with the location of these impairments within consolidated statement of income.

		Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	Income Statement Line	2021		2020		2021		2020
Goodwill	Impairment expense	$	—	$	—	$	—	$	7,330
Equity method investments	Income (loss) from equity method investments	13		—		13		1,315
Long-lived assets	Impairment expense	—		25		—		517
Long-lived assets	Depreciation and amortization	43		—		43		—
Total impairments		$	56	$	25	$	56	$	9,162

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Variable Interest Entities (Tables)

6 Months Ended

Jun. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

The following table presents balance sheet information for the assets and liabilities of MPLX, which are included in our balance sheets.

(In millions)	June 30, 2021		December 31, 2020
Assets
Cash and cash equivalents	$	8	$	15
Receivables, less allowance for doubtful accounts	546		478
Inventories	126		118
Other current assets	46		67
Assets held for sale	—		188
Equity method investments	4,033		4,036
Property, plant and equipment, net	20,352		21,418
Goodwill	7,657		7,657
Right of use assets	297		309
Other noncurrent assets	958		1,006
Liabilities
Accounts payable	$	495	$	468
Payroll and benefits payable	6		4
Accrued taxes	83		76
Debt due within one year	1		764
Operating lease liabilities	63		63
Liabilities held for sale	—		101
Other current liabilities	298		297
Long-term debt	19,234		19,375
Deferred income taxes	11		12
Long-term operating lease liabilities	232		244
Deferred credits and other liabilities	507		437

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Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2021

Related Party Transactions [Abstract]

Related Party Transactions

Transactions with related parties were as follows:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Sales to related parties	$	11	$	20	$	54	$	50
Purchases from related parties	219		158		422		353

Sales to related parties, which are included in sales and other operating revenues, consist primarily of refined product sales to certain of our equity affiliates.

Purchases from related parties are included in cost of revenues. We obtain utilities, transportation services and purchase ethanol from certain of our equity affiliates.

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Earnings (Loss) Per Share (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Summary of Earnings Per Common 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 stock-based compensation awards, provided the effect is not anti-dilutive.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions, except per share data)	2021		2020		2021		2020
Income (loss) from continuing operations, net of tax	$	588	$	84	$	418	$	(10,452)
Less: Net income (loss) attributable to noncontrolling interest	290		267		596		(717)
Net income allocated to participating securities	—		—		—		—
Income (loss) from continuing operations available to common stockholders	298		(183)		(178)		(9,735)
Income from discontinued operations, net of tax	8,214		192		8,448		510
Income (loss) available to common stockholders	$	8,512	$	9	$	8,270	$	(9,225)
Weighted average common shares outstanding:
Basic	650		650		651		649
Effect of dilutive securities	4		—		—		—
Diluted	654		650		651		649
Income (loss) available to common stockholders per share:
Basic:
Continuing operations	$	0.46	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.63		0.29		12.98		0.79
Net income (loss) per share	$	13.09	$	0.01	$	12.71	$	(14.21)
Diluted:
Continuing operations	$	0.45	$	(0.28)	$	(0.27)	$	(15.00)
Discontinued operations	12.55		0.29		12.98		0.79
Net income (loss) per share	$	13.00	$	0.01	$	12.71	$	(14.21)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes the shares that were anti-dilutive and, therefore, were excluded from the diluted share calculation.

	Three Months Ended  June 30,		Six Months Ended  June 30,
(In millions)	2021	2020	2021	2020
Shares issuable under stock-based compensation plans	3	9	8	11

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Reconciliation Of Segment Income From Operations To Income Before Income Taxes

The following reconciles segment income (loss) from operations to income (loss) from continuing operations before income taxes as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	224	$	(1,544)	$	(374)	$	(2,041)
Midstream	977		869		1,949		1,774
Segment income (loss) from operations	1,201		(675)		1,575		(267)
Corporate	(180)		(195)		(337)		(428)
Items not allocated to segments:
Transaction-related costs(a)	—		—		—		(8)
Impairments(b)	(56)		(25)		(56)		(9,162)
LCM inventory valuation adjustment	—		1,470		—		(1,715)
Income (loss) from continuing operations	965		575		1,182		(11,580)
Net interest and other financial costs	372		341		725		673
Income (loss) from continuing operations before income taxes	$	593	$	234	$	457	$	(12,253)

(a)Includes costs incurred in connection with the Midstream strategic review. Costs incurred in connection with the Speedway separation are included in discontinued operations. See Note 4.

(b)Includes impairment of goodwill, equity method investments and long lived assets. See Note 6 for additional information.

Reconciliation of Segment Depreciation and Amortization to Total Depreciation and Amortization

The following reconciles segment depreciation and amortization to total depreciation and amortization as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	466	$	463	$	944	$	936
Midstream	331		330		665		675
Segment depreciation and amortization	797		793		1,609		1,611
Corporate	74		40		106		85
Total depreciation and amortization	$	871	$	833	$	1,715	$	1,696

Reconciliation of Revenue from Segments to Consolidated

The following reconciles segment revenues to sales and other operating revenues as reported in the consolidated statements of income:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing
Revenues from external customers(a)	$	28,554	$	11,387	$	50,215	$	32,671
Intersegment revenues	30		4		58		29
Refining & Marketing segment revenues	28,584		11,391		50,273		32,700
Midstream
Revenues from external customers(a)	1,061		808		2,111		1,728
Intersegment revenues	1,248		1,165		2,447		2,406
Midstream segment revenues	2,309		1,973		4,558		4,134
Total segment revenues	30,893		13,364		54,831		36,834
Less: intersegment revenues	1,278		1,169		2,505		2,435
Sales and other operating revenues	$	29,615	$	12,195	$	52,326	$	34,399

(a)Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 4 and 8 for additional information.

Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures

The following reconciles segment capital expenditures and investments to total capital expenditures:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing	$	176	$	271	$	310	$	741
Midstream	178		425		316		899
Segment capital expenditures and investments	354		696		626		1,640
Less investments in equity method investees	62		214		113		383
Plus:
Corporate	23		18		44		45
Capitalized interest	16		27		30		56
Total capital expenditures(a)	$	331	$	527	$	587	$	1,358

(a)Includes changes in capital expenditure accruals. See Note 21 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2021 and 2020 as reported in the consolidated statements of cash flows.

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Net Interest and Other Financial Costs (Tables)

6 Months Ended

Jun. 30, 2021

Other Income and Expenses [Abstract]

Net Interest And Other Financial Income (Costs)

Net interest and other financial costs were as follows:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Interest income	$	(2)	$	(2)	$	(3)	$	(8)
Interest expense	337		371		688		726
Interest capitalized	(19)		(34)		(36)		(71)
Pension and other postretirement non-service costs(a)	56		(1)		56		(4)
Other financial costs	—		7		20		30
Net interest and other financial costs	$	372	$	341	$	725	$	673

(a)See Note 23.

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2021

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the continuing operations tax provision (benefit) in dollars as determined using the federal statutory income tax rate applied to income (loss) before income taxes to the provision (benefit) for income taxes is shown in the table below.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Tax computed at statutory rate	$	125	$	49	$	96	$	(2,573)
State and local income taxes, net of federal income tax effects	13		28		22		(216)
Goodwill impairment	—		—		—		1,157
Noncontrolling interests	(100)		43		(69)		144
Legislation(a)	(23)		18		(17)		(325)
Unrecognized tax benefits	2		—		16		—
Other	(12)		12		(9)		12
Total provision (benefit) for income tax from continuing operations	$	5	$	150	$	39	$	(1,801)

(a)2020 reflects the impact of the CARES Act.

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Inventories (Tables)

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Summary Of Inventories

(In millions)	June 30, 2021		December 31, 2020
Crude oil	$	2,780	$	2,588
Refined products	5,178		4,478
Materials and supplies	921		933
Total	$	8,879	$	7,999

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Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Summary Of Property, Plant And Equipment

	June 30, 2021						December 31, 2020
(In millions)	Gross PP&E		Accumulated Depreciation		Net PP&E		Gross PP&E		Accumulated Depreciation		Net PP&E
Refining & Marketing	$	30,573	$	14,086	$	16,487	$	30,306	$	13,257	$	17,049
Midstream	27,832		6,820		21,012		27,677		6,217		21,460
Corporate	1,389		892		497		1,356		830		526
Total	$	59,794	$	21,798	$	37,996	$	59,339	$	20,304	$	39,035

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Restructuring (Tables)

6 Months Ended

Jun. 30, 2021

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve by Type of Cost

(In millions)	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	(32)		(16)		(48)
Restructuring reserve balance at March 31, 2021	$	6	$	87	$	93
Cash payments	(5)		(11)		(16)
Restructuring reserve balance at June 30, 2021	$	1	$	76	$	77

(a)The restructuring reserve was zero until the third quarter of 2020.

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Assets and Liabilities Accounted for at Fair Value on Recurring Basis

The following tables present assets and liabilities accounted for at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 by fair value hierarchy level. We have elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty, including any related cash collateral as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the following tables.

	June 30, 2021
	Fair Value Hierarchy
(In millions)	Level 1		Level 2		Level 3		Netting and Collateral(a)		Net Carrying Value on Balance Sheet(b)		Collateral Pledged Not Offset
Assets:
Commodity contracts	$	340	$	1	$	—	$	(336)	$	5	$	74
Liabilities:
Commodity contracts	$	376	$	6	$	—	$	(382)	$	—	$	—
Embedded derivatives in commodity contracts	—		—		102		—		102		—

	December 31, 2020
	Fair Value Hierarchy
(In millions)	Level 1		Level 2		Level 3		Netting and Collateral(a)		Net Carrying Value on Balance Sheet(b)		Collateral Pledged Not Offset
Assets:
Commodity contracts	$	82	$	6	$	—	$	(80)	$	8	$	31
Liabilities:
Commodity contracts	$	81	$	10	$	—	$	(91)	$	—	$	—
Embedded derivatives in commodity contracts	—		—		63		—		63		—

(a)Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2021, cash collateral of $46 million was netted with the mark-to-market derivative liabilities. As of December 31, 2020, cash collateral of $11 million was netted with mark-to-market derivative liabilities.

(b)We have no derivative contracts that 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.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Beginning balance	$	66	$	45	$	63	$	60
Unrealized and realized (gains) losses included in net income	39		7		45		(7)
Settlements of derivative instruments	(3)		(1)		(6)		(2)
Ending balance	$	102	$	51	$	102	$	51
The amount of total losses (gains) for the period included in earnings attributable to the change in unrealized losses (gains) relating to assets still held at the end of period:	$	39	$	6	$	41	$	(7)

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Derivatives (Tables)

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Classification of Fair Values of Derivative Instruments, Excluding Cash Collateral

The following table presents the fair value of derivative instruments as of June 30, 2021 and December 31, 2020 and the line items in the balance sheets in which the fair values are reflected. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under the terms of our master netting arrangements including cash collateral on deposit with, or received from, brokers. We offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements when a legal right of offset exists. As a result, the asset and liability amounts below will not agree with the amounts presented in our consolidated balance sheets.

(In millions)	June 30, 2021				December 31, 2020
Balance Sheet Location	Asset		Liability		Asset		Liability
Commodity derivatives
Other current assets	$	341	$	382	$	88	$	91
Other current liabilities(a)	—		14		—		7
Deferred credits and other liabilities(a)	—		88		—		56

(a)     Includes embedded derivatives.

Open Commodity Derivative Contracts

The table below summarizes open commodity derivative contracts for crude oil, refined products and blending products as of June 30, 2021.

	Percentage of contracts that expire next quarter	Position
(Units in thousands of barrels)		Long	Short
Exchange-traded(a)
Crude oil	64.2%	32,507	37,899
Refined products	87.6%	19,615	23,055
Blending products	64.9%	2,624	5,055
Soybean oil	92.8%	1,702	1,838

(a)    Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 60 long and 1,460 short; Refined products - 380 long and 210 short; Blending products - 135 short

Effect of Commodity Derivative Instruments in Statements of Income

The following table summarizes the effect of all commodity derivative instruments in our consolidated statements of income: 

	Gain (Loss)
(In millions)	Three Months Ended  June 30,				Six Months Ended  June 30,
Income Statement Location	2021		2020		2021		2020
Sales and other operating revenues	$	(5)	$	(7)	$	(15)	$	77
Cost of revenues	(168)		(105)		(233)		26
Total	$	(173)	$	(112)	$	(248)	$	103

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Debt (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Outstanding Borrowings

Our outstanding borrowings at June 30, 2021 and December 31, 2020 consisted of the following:

(In millions)	June 30, 2021		December 31, 2020
Marathon Petroleum Corporation:
Commercial paper	$	—	$	1,024
Senior notes	8,549		9,849
Notes payable	1		1
Finance lease obligations	602		634
Total	$	9,152	$	11,508
MPLX LP:
Bank revolving credit facility	—		175
Senior notes	19,600		20,350
Finance lease obligations	9		11
Total	$	19,609	$	20,536
Total debt	$	28,761	$	32,044
Unamortized debt issuance costs	(144)		(154)
Unamortized (discount) premium, net	(297)		(306)
Amounts due within one year	(70)		(2,854)
Total long-term debt due after one year	$	28,250	$	28,730

Schedule of Line of Credit Facilities

Available Capacity under our Credit Facilities as of June 30, 2021

(Dollars in millions)	Total Capacity		Outstanding Borrowings		Outstanding Letters of Credit		Available Capacity		Weighted Average Interest Rate		Expiration
MPC, excluding MPLX
MPC bank revolving credit facility	$	5,000	$	—	$	1	$	4,999	—	%	October 2023
MPC trade receivables securitization facility	100		—		—		100		—		July 2021
MPLX
MPLX bank revolving credit facility	3,500		—		—		3,500		—	%	July 2024

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Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue from External Customers by Products and Services

The following table presents our revenues from external customers disaggregated by segment and product line.

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Refining & Marketing:
Refined products	$	26,528	$	10,268	$	46,337	$	30,537
Crude oil	1,866		1,003		3,312		1,878
Services and other	160		116		566		256
Total revenues from external customers	28,554		11,387		50,215		32,671
Midstream:
Refined products	304		123		586		294
Services and other	757		685		1,525		1,434
Total revenues from external customers	1,061		808		2,111		1,728
Sales and other operating revenues	$	29,615	$	12,195	$	52,326	$	34,399

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Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2021

Supplemental Cash Flow Elements [Abstract]

Summary of Supplemental Cash Flow Information

	Six Months Ended  June 30,
(In millions)	2021		2020
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$	649	$	601
Net income taxes paid to taxing authorities(a)	319		6

(a)Includes income tax payments related to continuing and discontinued operations.

Schedule of Cash and Cash Equivalents

(In millions)	June 30, 2021		December 31, 2020
Cash and cash equivalents(a)	$	11,839	$	415
Restricted cash(b)	—		1
Cash, cash equivalents and restricted cash	$	11,839	$	416

(a)Excludes $140 million of cash at December 31, 2020, representing Speedway store cash, which was included in assets held for sale.

(b)The restricted cash balance is included within other current assets on the consolidated balance sheets.

Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures

The consolidated statements of cash flows exclude changes to the consolidated balance sheets that did not affect cash. The following is a reconciliation of additions to property, plant and equipment to total capital expenditures:

	Six Months Ended  June 30,
(In millions)	2021		2020
Additions to property, plant and equipment per the consolidated statements of cash flows	$	606	$	1,696
Decrease in capital accruals	(19)		(338)
Total capital expenditures	$	587	$	1,358

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Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Changes in Accumulated Other Comprehensive Loss by Component

The following table shows the changes in accumulated other comprehensive loss by component. Amounts in parentheses indicate debits.

(In millions)	Pension Benefits		Other Benefits		Gain on Cash Flow Hedge		Workers Compensation		Total
Balance as of December 31, 2019	$	(212)	$	(116)	$	1	$	7	$	(320)
Other comprehensive loss before reclassifications, net of tax of $(4)	(10)		(2)		—		—		(12)
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(23)		—		—		—		(23)
– actuarial loss(a)	18		1		—		—		19
– settlement loss(a)	1		—		—		—		1
Other	—		—		—		(3)		(3)
Tax effect	1		—		—		1		2
Other comprehensive loss	(13)		(1)		—		(2)		(16)
Balance as of June 30, 2020	$	(225)	$	(117)	$	1	$	5	$	(336)

(In millions)	Pension Benefits		Other Benefits		Gain on Cash Flow Hedge		Workers Compensation		Total
Balance as of December 31, 2020	$	(338)	$	(181)	$	1	$	6	$	(512)
Other comprehensive gain (loss) before reclassifications, net of tax of $44	132		1		—		(4)		129
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(23)		1		—		—		(22)
– actuarial loss(a)	24		5		—		—		29
– settlement loss(a)	49		—		—		—		49
Tax effect	(11)		(2)		—		—		(13)
Other comprehensive income (loss)	171		5		—		(4)		172
Balance as of June 30, 2021	$	(167)	$	(176)	$	1	$	2	$	(340)

(a)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 23.

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Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Costs

The following summarizes the components of net periodic benefit costs:

	Three Months Ended  June 30,				Six Months Ended  June 30,
(In millions)	2021		2020		2021		2020
Pension Benefits
Service cost	$	72	$	77	$	148	$	140
Interest cost	23		23		46		48
Expected return on plan assets	(29)		(31)		(62)		(65)
Amortization – prior service credit	(12)		(11)		(23)		(22)
– actuarial loss	14		9		25		17
– settlement loss	49		1		49		1
Net periodic pension benefits cost	$	117	$	68	$	183	$	119
Other Benefits
Service cost	$	7	$	9	$	17	$	18
Interest cost	8		8		15		16
Amortization – prior service cost	—		—		1		—
– actuarial loss	3		—		5		1
Net periodic other benefits cost	$	18	$	17	$	38	$	35

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Description of the Business and Basis of Presentation (Fair Value) (Details)	6 Months Ended
	Jun. 30, 2021 $ / gal USD ($)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Average forward price | $ / gal	0.81
Embedded derivatives in commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term of contract	5 years
Embedded derivatives in commodity contracts | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Probability of renewal first term	100.00%
Probability of renewal second term	100.00%
Minimum | Commodity derivatives | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward commodity price	0.64
Maximum | Commodity derivatives | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward commodity price	1.59

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Short-term Investments (Components of Investments) (Details) $ in Millions	Jun. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 13,177
Unrealized Gains	0
Unrealized Losses	0
Fair Value	13,177
Cash	4,080
Short-term investments and cash	17,257
Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,378
Unrealized Gains	0
Unrealized Losses	0
Fair Value	8,378
Certificates of deposit and time deposits | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,501
Unrealized Gains	0
Unrealized Losses	0
Fair Value	4,501
U.S. government securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50
Unrealized Gains	0
Unrealized Losses	0
Fair Value	50
Corporate notes and bonds | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	248
Unrealized Gains	0
Unrealized Losses	0
Fair Value	248
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair Value	7,759
Cash	4,080
Short-term investments and cash	11,839
Cash and Cash Equivalents | Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	3,907
Cash and Cash Equivalents | Certificates of deposit and time deposits | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	3,625
Cash and Cash Equivalents | U.S. government securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	50
Cash and Cash Equivalents | Corporate notes and bonds | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	177
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Fair Value	5,418
Cash	0
Short-term investments and cash	5,418
Short-term Investments | Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	4,471
Short-term Investments | Certificates of deposit and time deposits | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	876
Short-term Investments | U.S. government securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Fair Value	0
Short-term Investments | Corporate notes and bonds | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 71

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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
Current income tax expense on gain from disposal of discontinued operation	4,160
Deferred income tax benefit on gain from disposal of discontinued operation	$ 497

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Discontinued Operations (Results of Operations associated with Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues, other income and net gain on disposal of assets:
Net gain on disposal of assets	$ 0	$ 2	$ 3	$ 5
Total revenues, other income and net gain on disposal of assets	29,827	12,300	52,709	33,297
Costs and expenses:
Cost of revenues (excludes items below)	27,177	11,502	48,261	31,844
LCM inventory valuation adjustment	0	(1,470)	0	1,715
Depreciation and amortization	871	833	1,715	1,696
Selling, general and administrative expenses	625	665	1,200	1,407
Other taxes	189	170	351	368
Total costs and expenses	28,862	11,725	51,527	44,877
Income from operations	965	575	1,182	(11,580)
Net interest and other financial costs	372	341	725	673
Income from discontinued operations, net of tax	8,214	192	8,448	510
Discontinued Operations, Disposed of by Sale
Revenues, other income and net gain on disposal of assets:
Revenues and other income	3,081	4,147	8,420	9,706
Net gain on disposal of assets	11,682	0	11,682	1
Total revenues, other income and net gain on disposal of assets	14,763	4,147	20,102	9,707
Costs and expenses:
Cost of revenues (excludes items below)	2,748	3,524	7,654	8,480
LCM inventory valuation adjustment	0	(10)	0	25
Depreciation and amortization	1	102	3	201
Selling, general and administrative expenses	48	81	121	160
Other taxes	24	44	75	97
Total costs and expenses	2,821	3,741	7,853	8,963
Income from operations	11,942	406	12,249	744
Net interest and other financial costs	2	4	6	10
Income before income taxes	11,940	402	12,243	734
Provision for income taxes	3,726	210	3,795	224
Income from discontinued operations, net of tax	$ 8,214	$ 192	$ 8,448	$ 510

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Master Limited Partnership (Details)	Jun. 30, 2021
MPLX | Marathon Petroleum Corporation
MPC's partnership interest in MLP (in percentage)	63.00%

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Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2021	Jun. 30, 2021	Nov. 02, 2020
Stock repurchase program, authorized amount		$ 10,000
Stock repurchase program, remaining authorized repurchase amount		$ 9,020
MPLX LP
Stock repurchase program, authorized amount			$ 1,000
Stock repurchased and retired during period, shares		11,929,998
Treasury stock acquired, average cost per share		$ 26.02
Stock repurchased and retired during period, value		$ 310
Stock repurchase program, remaining authorized repurchase amount		$ 657
MPLX LP | Subsequent Event
Stock repurchased and retired during period, shares	126,293
Stock repurchased and retired during period, value	$ 4

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Master Limited Partnership (Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity transactions of MPLX	$ (148)	$ (124)	$ 6	$ (7)
Additional Paid-in Capital
Increase (decrease) due to issuance/(repurchase) of MPLX common units					$ (76)	$ 4
Tax impact					38	(1)
Equity transactions of MPLX	$ (34)	$ (4)	$ 8	$ (5)	$ (38)	$ 3

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Impairments (Income Statement Location of Impairments) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment			$ 7,330
Equity method investment impairment			$ 1,315
Total impairments	$ 56	$ 25		$ 56	$ 9,162
Impairment expense
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	0	0		0	7,330
Long-lived assets impairment	0	25		0	517
Income (loss) from equity method investments
Finite-Lived Intangible Assets [Line Items]
Equity method investment impairment	13	0		13	1,315
Depreciation and amortization
Finite-Lived Intangible Assets [Line Items]
Long-lived assets impairment	$ 43	$ 0		$ 43	$ 0

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Impairments (Goodwill) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 7,330
Refining & Marketing
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	5,516
Midstream
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 1,814

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Impairments (Equity Method Investments) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items]
Equity method investment impairment	$ 1,315
MPLX LP | MarkWest Utica EMG
Finite-Lived Intangible Assets [Line Items]
Equity method investment impairment	$ 1,250

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Impairments (Long-lived Assets) (Details) - Impairment expense - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Long-lived assets impairment	$ 0	$ 25		$ 0	$ 517
Refining & Marketing
Finite-Lived Intangible Assets [Line Items]
Long-lived assets impairment			$ 142
MPLX LP | Midstream
Finite-Lived Intangible Assets [Line Items]
Long-lived assets impairment			$ 350

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Variable Interest Entities (Consolidated VIEs) (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	[1]	$ 11,839	$ 415
Receivables, less allowance for doubtful accounts		9,771	5,760
Inventories		8,879	7,999
Other current assets		2,685	2,724
Equity method investments		5,424	5,422
Property, plant and equipment, net		37,996	39,035
Goodwill		8,256	8,256
Right of use assets		1,500	1,521
Other noncurrent assets		2,532	2,637
Liabilities
Accounts payable		12,170	7,803
Payroll and benefits payable		651	732
Accrued taxes		5,219	1,105
Debt due within one year		70	2,854
Operating lease liabilities		473	497
Other current liabilities		929	822
Long-term debt		28,250	28,730
Deferred income taxes		5,704	6,203
Long-term operating lease liabilities		1,020	1,014
Deferred credits and other liabilities		1,271	1,207
Variable Interest Entity, Primary Beneficiary | MPLX
Assets
Cash and cash equivalents		8	15
Receivables, less allowance for doubtful accounts		546	478
Inventories		126	118
Other current assets		46	67
Assets held for sale		0	188
Equity method investments		4,033	4,036
Property, plant and equipment, net		20,352	21,418
Goodwill		7,657	7,657
Right of use assets		297	309
Other noncurrent assets		958	1,006
Liabilities
Accounts payable		495	468
Payroll and benefits payable		6	4
Accrued taxes		83	76
Debt due within one year		1	764
Operating lease liabilities		63	63
Liabilities held for sale		0	101
Other current liabilities		298	297
Long-term debt		19,234	19,375
Deferred income taxes		11	12
Long-term operating lease liabilities		232	244
Deferred credits and other liabilities		$ 507	$ 437

[1] Excludes $140 million of cash at December 31, 2020, representing Speedway store cash, which was included in assets held for sale.

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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Related Party Transactions [Abstract]
Sales to related parties	$ 11	$ 20	$ 54	$ 50
Purchases from related parties	$ 219	$ 158	$ 422	$ 353

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Earnings (Loss) Per Share (Summary of Earnings (Loss) Per Share) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Income (loss) from continuing operations, net of tax	$ 588	$ 84	$ 418	$ (10,452)
Less: Net income (loss) attributable to noncontrolling interest	290	267	596	(717)
Net income allocated to participating securities	0	0	0	0
Income (loss) from continuing operations available to common stockholders	298	(183)	(178)	(9,735)
Income from discontinued operations, net of tax	8,214	192	8,448	510
Income (loss) available to common stockholders	$ 8,512	$ 9	$ 8,270	$ (9,225)
Weighted average common shares outstanding:
Basic (in shares)	650	650	651	649
Effect of dilutive securities (in shares)	4	0	0	0
Diluted (in shares)	654	650	651	649
Basic:
Continuing operations	$ 0.46	$ (0.28)	$ (0.27)	$ (15.00)
Discontinued operations	12.63	0.29	12.98	0.79
Net income (loss) per share	13.09	0.01	12.71	(14.21)
Diluted:
Continuing operations	0.45	(0.28)	(0.27)	(15.00)
Discontinued operations	12.55	0.29	12.98	0.79
Net income (loss) per share	$ 13.00	$ 0.01	$ 12.71	$ (14.21)

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Earnings (Loss) Per Share (Anti-dilutive Shares) (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock Based Compensation Expense
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares issuable under stock-based compensation plans	3	9	8	11

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Equity (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Jun. 15, 2021	Jun. 30, 2021	Jun. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 10,000
Payments for repurchase of common stock		984	$ 0
Stock repurchase program, remaining authorized repurchase amount		9,020
Share Repurchase Authorization May 2021
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 7,100
Modified Dutch Auction Tender
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased	15,573,365
Treasury stock acquired, average cost per share	$ 63.00
Payments for repurchase of common stock	$ 981

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Segment Information (Additional Information) (Detail)	6 Months Ended
	Jun. 30, 2021 Segment
Segment Reporting [Abstract]
Number of reportable segments	2

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Segment Information (Reconciliation Of Segment Income From Operations To Income Before Income Taxes) (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021		Jun. 30, 2020		Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) from operations	$ 965		$ 575		$ 1,182	$ (11,580)
Impairments	56		25		56	9,162
LCM inventory valuation adjustment	0		(1,470)		0	1,715
Net interest and other financial costs	372		341		725	673
Income before income taxes	593		234		457	(12,253)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) from operations	1,201		(675)		1,575	(267)
Operating Segments | Refining & Marketing
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) from operations	224		(1,544)		(374)	(2,041)
Operating Segments | Midstream
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) from operations	977		869		1,949	1,774
Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (loss) from operations	(180)		(195)		(337)	(428)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Transaction-related costs	0	[1]	0	[1]	0	(8)	[1]
Impairments	(56)	[2]	(25)		(56)	(9,162)	[2]
LCM inventory valuation adjustment	$ 0		$ 1,470		$ 0	$ (1,715)

[1] Includes costs incurred in connection with the Midstream strategic review. Costs incurred in connection with the Speedway separation are included in discontinued operations. See Note 4.

[2] Includes impairment of goodwill, equity method investments and long lived assets. See Note 6 for additional information.

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Segment Information (Reconciliation of Segment D&A to Total D&A) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization	$ 871	$ 833	$ 1,715	$ 1,696
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization	797	793	1,609	1,611
Operating Segments | Refining & Marketing
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization	466	463	944	936
Operating Segments | Midstream
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization	331	330	665	675
Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization	$ 74	$ 40	$ 106	$ 85

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Segment Information (Reconciliation of Segment Revenues To Sales and Other Operating Revenues) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 29,615	$ 12,195	$ 52,326	$ 34,399
Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	28,554	11,387	50,215	32,671
Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	1,061	808	2,111	1,728
Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,278	1,169	2,505	2,435
Intersegment Eliminations | Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues		30	4	58	29
Intersegment Eliminations | Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,248	1,165	2,447	2,406
Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues		30,893	13,364	54,831	36,834
Operating Segments | Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues		28,584	11,391	50,273	32,700
Operating Segments | Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 2,309	$ 1,973	$ 4,558	$ 4,134

[1] Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 4 and 8 for additional information

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Segment Information (Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Plus:
Capital expenditures	[1]	$ 331	$ 527	$ 587	$ 1,358
Operating Segments
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Capital expenditures and investments		354	696	626	1,640
Less investments in equity method investees		62	214	113	383
Operating Segments | Refining & Marketing
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Capital expenditures and investments		176	271	310	741
Operating Segments | Midstream
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Capital expenditures and investments		178	425	316	899
Corporate
Plus:
Corporate		23	18	44	45
Capitalized interest		$ 16	$ 27	$ 30	$ 56

[1] Includes changes in capital expenditure accruals. See Note 21 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2021 and 2020 as reported in the consolidated statements of cash flows.

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Net Interest and Other Financial Costs (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Interest income		$ (2)	$ (2)	$ (3)	$ (8)
Interest expense		337	371	688	726
Interest capitalized		(19)	(34)	(36)	(71)
Pension and other postretirement non-service costs	[1]	56	(1)	56	(4)
Other financial costs		0	7	20	30
Net interest and other financial costs		$ 372	$ 341	$ 725	$ 673

[1] See Note 23.

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Provision (benefit) for income taxes on continuing operations	$ 5	$ 150	$ 39	$ (1,801)
CARES Act
Income taxes receivable, current	$ 2,100		$ 2,100

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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Tax computed at statutory rate	$ 125	$ 49	$ 96	$ (2,573)
State and local income taxes, net of federal income tax effects	13	28	22	(216)
Goodwill impairment	0	0	0	1,157
Noncontrolling interests	(100)	43	(69)	144
Legislation	(23)	18	(17)	(325)	[1]
Unrecognized tax benefits	2	0	16	0
Other	(12)	12	(9)	12
Provision (benefit) for income taxes on continuing operations	$ 5	$ 150	$ 39	$ (1,801)

[1] 2020 reflects the impact of the CARES Act.

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Inventories (Summary of Inventories) (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Crude oil	$ 2,780	$ 2,588
Refined products	5,178	4,478
Materials and supplies	921	933
Inventories	$ 8,879	$ 7,999

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Property, Plant and Equipment (Summary of Property, Plant And Equipment) (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 59,794	$ 59,339
Less accumulated depreciation	21,798	20,304
Property, plant and equipment, net	37,996	39,035
Operating Segments | Refining & Marketing
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,573	30,306
Less accumulated depreciation	14,086	13,257
Property, plant and equipment, net	16,487	17,049
Operating Segments | Midstream
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,832	27,677
Less accumulated depreciation	6,820	6,217
Property, plant and equipment, net	21,012	21,460
Corporate
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,389	1,356
Less accumulated depreciation	892	830
Property, plant and equipment, net	$ 497	$ 526

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Restructuring (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	[1]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 367
Restructuring reserve	$ 141	$ 77	$ 93	$ 291
Number of positions eliminated	2,050
Exit and disposal costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 195
Restructuring reserve	103	76	87	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	130
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	172
Restructuring reserve	38	$ 1	$ 6	$ 158
MPLX LP | Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 37

[1] The restructuring reserve was zero until the third quarter of 2020.

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Restructuring Reserve (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring reserve - beginning balance	$ 93	$ 141	$ 291	[1]
Adjustments			19
Cash payments	(16)	(48)	(169)
Restructuring reserve - ending balance	77	93	141
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve - beginning balance	6	38	158	[1]
Adjustments			14
Cash payments	(5)	(32)	(134)
Restructuring reserve - ending balance	1	6	38
Exit and disposal costs
Restructuring Cost and Reserve [Line Items]
Restructuring reserve - beginning balance	87	103	133	[1]
Adjustments			5
Cash payments	(11)	(16)	(35)
Restructuring reserve - ending balance	$ 76	$ 87	$ 103

[1] The restructuring reserve was zero until the third quarter of 2020.

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Fair Value Measurements (Assets and Liabilities Accounted for at Fair Value on Recurring Basis) (Detail) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash collateral netted with derivative liabilities		$ 46	$ 11
Fair Value, Measurements, Recurring | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - netting and collateral	[1]	(336)	(80)
Commodity derivative instruments, assets - net carrying value on balance sheet	[2]	5	8
Commodity derivative instruments, assets - collateral pledged not offset		74	31
Commodity derivative instruments, liabilities - netting and collateral	[1]	(382)	(91)
Commodity derivative instruments, liabilities - net carrying value on balance sheet	[2]	0	0
Commodity derivative instruments, liabilities - collateral pledged not offset		0	0
Fair Value, Measurements, Recurring | Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - netting and collateral		0	0
Commodity derivative instruments, liabilities - net carrying value on balance sheet	[2]	102	63
Commodity derivative instruments, liabilities - collateral pledged not offset		0	0
Fair Value, Measurements, Recurring | Level 1 | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset		340	82
Commodity derivative instruments, liabilities - gross		376	81
Fair Value, Measurements, Recurring | Level 1 | Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring | Level 2 | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset		1	6
Commodity derivative instruments, liabilities - gross		6	10
Fair Value, Measurements, Recurring | Level 2 | Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring | Level 3 | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset		0	0
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring | Level 3 | Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		$ 102	$ 63

[1] Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2021, cash collateral of $46 million was netted with the mark-to-market derivative liabilities. As of December 31, 2020, cash collateral of $11 million was netted with mark-to-market derivative liabilities.

[2] We have no derivative contracts that are subject to master netting arrangements reflected gross on the balance sheet.

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Fair Value Measurements (Reconciliation of Net Beginning and Ending Balances Recorded for Net Assets and Liabilities Classified as Level 3) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 66	$ 45	$ 63	$ 60
Unrealized and realized (gains) losses included in net income	39	7	45	(7)
Settlements of derivative instruments	(3)	(1)	(6)	(2)
Ending balance	$ 102	$ 51	$ 102	$ 51

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Fair Value Measurements (Losses Included in Earnings Relating to Assets Still Held at End of Period) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Fair Value Disclosures [Abstract]
The amount of total losses (gains) for the period included in earnings attributable to the change in unrealized losses (gains) relating to assets still held at the end of period:	$ 39	$ 6	$ 41	$ (7)

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Fair Value Measurements (Fair Values - Reported) (Detail) - USD ($) $ in Billions	Jun. 30, 2021	Dec. 31, 2020
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 27.9	$ 31.1
Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 31.5	$ 34.9

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Derivatives (Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral) (Detail) - Commodity derivatives - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Other current assets
Derivative [Line Items]
Asset		$ 341	$ 88
Liability		382	91
Other current liabilities
Derivative [Line Items]
Asset		0	0
Liability	[1]	14	7
Deferred credits and other liabilities
Derivative [Line Items]
Asset		0	0
Liability	[1]	$ 88	$ 56

[1] Includes embedded derivatives.

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Derivatives (Open Commodity Derivative Contracts) (Details) - Exchange Traded gal in Thousands, bbl in Thousands	6 Months Ended
	Jun. 30, 2021 bbl gal
Crude oil
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	64.20%
Crude oil | Long
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	32,507
Crude oil | Long | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	60
Crude oil | Short
Derivative [Line Items]
Notional contracts (in thousands of total barrels) | gal	37,899
Crude oil | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	1,460
Refined products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	87.60%
Refined products | Long
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	19,615
Refined products | Long | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	380
Refined products | Short
Derivative [Line Items]
Notional contracts (in thousands of total barrels) | gal	23,055
Refined products | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	210
Blending products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	64.90%
Blending products | Long
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	2,624
Blending products | Short
Derivative [Line Items]
Notional contracts (in thousands of total barrels) | gal	5,055
Blending products | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	135
Soybean oil
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	92.80%
Soybean oil | Long
Derivative [Line Items]
Notional contracts (in thousands of total barrels)	1,702
Soybean oil | Short
Derivative [Line Items]
Notional contracts (in thousands of total barrels) | gal	1,838

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Derivatives (Effect of Commodity Derivative Instruments in Statements of Income) (Detail) - Commodity derivatives - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss)	$ (173)	$ (112)	$ (248)	$ 103
Sales and other operating revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss)	(5)	(7)	(15)	77
Cost of revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss)	$ (168)	$ (105)	$ (233)	$ 26

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Debt (Outstanding Borrowings) (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Total debt	$ 28,761	$ 32,044
Unamortized debt issuance costs	(144)	(154)
Unamortized (discount) premium, net	(297)	(306)
Amounts due within one year	(70)	(2,854)
Total long-term debt due after one year	28,250	28,730
Marathon Petroleum Corporation:
Finance lease obligations	602	634
Total debt	9,152	11,508
Marathon Petroleum Corporation: | Commercial paper
Long-term debt, gross	0	1,024
Marathon Petroleum Corporation: | Senior notes
Long-term debt, gross	8,549	9,849
Marathon Petroleum Corporation: | Notes payable
Long-term debt, gross	1	1
MPLX LP:
Finance lease obligations	9	11
Total debt	19,609	20,536
MPLX LP: | Bank revolving credit facility
Long-term debt, gross	0	175
MPLX LP: | Senior notes
Long-term debt, gross	$ 19,600	$ 20,350

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Debt (Available Capacity under our Facilities) (Details) $ in Millions	Jun. 30, 2021 USD ($)
MPC bank revolving credit facility
Debt Instrument [Line Items]
Total Capacity	$ 5,000
Outstanding Borrowings	0
Outstanding Letters of Credit	1
Available Capacity	$ 4,999
Weighted Average Interest Rate	0.00%
MPC trade receivables securitization facility
Debt Instrument [Line Items]
Total Capacity	$ 100
Outstanding Borrowings	0
Outstanding Letters of Credit	0
Available Capacity	$ 100
Weighted Average Interest Rate	0.00%
MPLX LP | MPLX bank revolving credit facility
Debt Instrument [Line Items]
Total Capacity	$ 3,500
Outstanding Borrowings	0
Outstanding Letters of Credit	0
Available Capacity	$ 3,500
Weighted Average Interest Rate	0.00%

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Debt (MPC 364-Day Bank Revolving Credit Facilities) (Details) - Marathon Petroleum Corporation: - USD ($) $ in Millions		1 Months Ended
	Jun. 18, 2021	Feb. 28, 2021
MPC 364-day bank revolving credit facility due April 2021
Debt Instrument [Line Items]
Line of credit facility, termination		$ 1,000
MPC 364-day revolving credit facility due September 2021
Debt Instrument [Line Items]
Line of credit facility, termination	$ 1,000

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Debt (Trade Receivables Securitization Facility) (Details) - USD ($) $ in Millions	Jun. 23, 2021	Jul. 19, 2019
MPC trade receivables securitization facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 100	$ 750

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Debt (MPC Senior Notes) (Details) - Marathon Petroleum Corporation: - Senior notes - USD ($) $ in Millions		1 Months Ended
	Mar. 01, 2021	Jun. 30, 2021
Senior notes, 5.125% due March 2021
Debt Instrument [Line Items]
Repayments of debt	$ 1,000
Senior notes, 5.125% due April 2024
Debt Instrument [Line Items]
Repayments of debt		$ 300

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Debt (MPLX Senior Notes) (Details) - MPLX LP - Senior notes - USD ($) $ in Millions	Sep. 03, 2021	Jan. 15, 2021
Senior notes, 5.250% due January 2025
Debt Instrument [Line Items]
Repayments of debt		$ 750
Floating rate senior notes due September 2022 | Subsequent Event
Debt Instrument [Line Items]
Repayments of debt	$ 1,000

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Revenue (Disaggregated by Product Line) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Sales and other operating revenues		$ 29,615	$ 12,195	$ 52,326	$ 34,399
Refining & Marketing
Sales and other operating revenues	[1]	28,554	11,387	50,215	32,671
Refining & Marketing | Refined products
Sales and other operating revenues		26,528	10,268	46,337	30,537
Refining & Marketing | Crude oil
Sales and other operating revenues		1,866	1,003	3,312	1,878
Refining & Marketing | Services and other
Sales and other operating revenues		160	116	566	256
Midstream
Sales and other operating revenues	[1]	1,061	808	2,111	1,728
Midstream | Refined products
Sales and other operating revenues		304	123	586	294
Midstream | Services and other
Sales and other operating revenues		$ 757	$ 685	$ 1,525	$ 1,434

[1] Includes Refining & Marketing intercompany sales to Speedway prior to May 14, 2021 and related party sales. See Notes 4 and 8 for additional information

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Revenue (Details) $ in Millions	Jun. 30, 2021 USD ($)
Revenue from Contract with Customer [Abstract]
Matching buy/sell receivables	$ 3,840

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Supplemental Cash Flow Information (Summary of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021		Jun. 30, 2020
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$ 649		$ 601
Net income taxes paid to (received from) taxing authorities	$ 319	[1]	$ 6

[1] Includes income tax payments related to continuing and discontinued operations.

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Supplemental Cash Flow Information (Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Cash and cash equivalents	[1]	$ 11,839	$ 415
Restricted cash	[2]	0	1
Cash, cash equivalents and restricted cash		11,839	416	$ 966	$ 1,395
Discontinued Operations, Held-for-sale
Cash and cash equivalents			140
Cash, cash equivalents and restricted cash	[3]	$ 0	$ 140	$ 127	$ 134

[1] Excludes $140 million of cash at December 31, 2020, representing Speedway store cash, which was included in assets held for sale.

[2] The restricted cash balance is included within other current assets on the consolidated balance sheets

[3] Reported as assets held for sale on our consolidated balance sheets.

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Supplemental Cash Flow Information (Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]
Additions to property, plant and equipment per the consolidated statements of cash flows				$ 606	$ 1,696
Decrease in capital accruals				(19)	(338)
Capital expenditures	[1]	$ 331	$ 527	$ 587	$ 1,358

[1] Includes changes in capital expenditure accruals. See Note 21 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the six months ended June 30, 2021 and 2020 as reported in the consolidated statements of cash flows.

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Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss by Component) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (512)		$ (320)	$ (512)	$ (320)
Other comprehensive income (loss), before reclassifications, net of tax						129	(12)
Amounts reclassified from accumulated other comprehensive loss:
Amortization - prior service credit						(22)	(23)
Amortization - actuarial loss						29	19
Amortization - settlement loss						49	1
Other							(3)
Tax effect						(13)	2
Other comprehensive income (loss)		$ 171	1	$ (10)	(6)	172	(16)
Ending balance		(340)		(336)		(340)	(336)
Other comprehensive income (loss) before reclassifications, tax						44	(4)
Accumulated Defined Benefit Plans Adjustment | Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(338)		(212)	(338)	(212)
Other comprehensive income (loss), before reclassifications, net of tax						132	(10)
Amounts reclassified from accumulated other comprehensive loss:
Amortization - prior service credit	[1]					(23)	(23)
Amortization - actuarial loss	[1]					24	18
Amortization - settlement loss	[1]					49	1
Tax effect						(11)	1
Other comprehensive income (loss)						171	(13)
Ending balance		(167)		(225)		(167)	(225)
Accumulated Defined Benefit Plans Adjustment | Other Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(181)		(116)	(181)	(116)
Other comprehensive income (loss), before reclassifications, net of tax						1	(2)
Amounts reclassified from accumulated other comprehensive loss:
Amortization - prior service credit	[1]					1	0
Amortization - actuarial loss	[1]					5	1
Amortization - settlement loss						0	0
Tax effect						(2)	0
Other comprehensive income (loss)						5	(1)
Ending balance		(176)		(117)		(176)	(117)
Gain on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			1		1	1	1
Other comprehensive income (loss), before reclassifications, net of tax						0	0
Amounts reclassified from accumulated other comprehensive loss:
Tax effect						0	0
Other comprehensive income (loss)						0	0
Ending balance		1		1		1	1
Workers Compensation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 6		$ 7	6	7
Other comprehensive income (loss), before reclassifications, net of tax						(4)	0
Amounts reclassified from accumulated other comprehensive loss:
Other							(3)
Tax effect						0	1
Other comprehensive income (loss)						(4)	(2)
Ending balance		$ 2		$ 5		$ 2	$ 5

[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 23.

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Pension and Other Postretirement Benefits (Components of Net Periodic Benefit Costs) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Benefits
Components of net periodic benefit cost:
Service cost	$ 72	$ 77	$ 148	$ 140
Interest cost	23	23	46	48
Expected return on plan assets	(29)	(31)	(62)	(65)
Amortization – prior service credit	(12)	(11)	(23)	(22)
Amortization – actuarial loss	14	9	25	17
Amortization - settlement loss	49	1	49	1
Net periodic benefit cost	117	68	183	119
Other Benefits
Components of net periodic benefit cost:
Service cost	7	9	17	18
Interest cost	8	8	15	16
Amortization – prior service credit	0	0	1	0
Amortization – actuarial loss	3	0	5	1
Net periodic benefit cost	$ 18	$ 17	$ 38	$ 35

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Pension and Other Postretirement Benefits (Additional Information) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 226
Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	14
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ 24

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Commitments and Contingencies (Detail)	6 Months Ended
	Jun. 30, 2021
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.

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Commitments and Contingencies (Environmental Matters) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Accrued liabilities for remediation	$ 397	$ 397
Receivables for recoverable costs	$ 6	$ 7

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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

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Commitments and Contingencies (Guarantees) (Details) $ in Millions	Jun. 30, 2021 USD ($)
Other Guarantees
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 99
LOOP and LOCAP LLC | Guarantee of Indebtedness of Others | Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 171
Bakken Pipeline System
Loss Contingencies [Line Items]
Ownership percentage	9.19%
Bakken Pipeline System | Guarantee of Indebtedness of Others | Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 230
Crowley Ocean Partners
Loss Contingencies [Line Items]
Ownership percentage	50.00%
Crowley Ocean Partners | Guarantee of Indebtedness of Others | Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 114
Crowley Ocean Partners | Guarantee of Indebtedness of Others | Financial Guarantee | Crowley Term Loan
Loss Contingencies [Line Items]
Maximum borrowing capacity	$ 325
Crowley Blue Water Partners
Loss Contingencies [Line Items]
Ownership percentage	50.00%
Crowley Blue Water Partners | Guarantee of Indebtedness of Others | Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 111

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Commitments and Contingencies (Contractual Commitments and Contingencies) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contractual commitments to acquire property, plant and equipment and advance funds to equity method investees	$ 562