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 September 30, 2019

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 649,321,709 shares of Marathon Petroleum Corporation common stock outstanding as of October 31, 2019.

MARATHON PETROLEUM CORPORATION

FORM 10-Q

FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2019

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	7
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS	9
ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	34
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	59
ITEM 4. CONTROLS AND PROCEDURES	60
PART II – OTHER INFORMATION
ITEM 1. LEGAL PROCEEDINGS	61
ITEM 1A. RISK FACTORS	61
ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	62
ITEM 5. OTHER INFORMATION	62
ITEM 6. EXHIBITS	63
SIGNATURES	65

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	Alaskan 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
CARB	California Air Resources Board
CARBOB	California Reformulated Gasoline Blendstock for Oxygenate Blending
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
FASB	Financial Accounting Standards Board
GAAP	Accounting principles generally accepted in the United States
IDR	Incentive Distribution Right
LCM	Lower of cost or market
LIFO	Last in, first out, an inventory costing method
LIBOR	London Interbank Offered Rate
LLS	Louisiana Light Sweet crude oil, an oil index benchmark price
mbpd	Thousand barrels per day
MMBtu	One million British thermal units, an energy measurement
MMcf/d	One million cubic feet of natural gas per day
NGL	Natural gas liquids, such as ethane, propane, butanes and natural gasoline
NYMEX	New York Mercantile Exchange
OPEC	Organization of Petroleum Exporting Countries
OTC	Over-the-Counter
ppm	Parts per million
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  September 30,				Nine Months Ended  September 30,
(Millions of dollars, except per share data)	2019		2018		2019		2018
Revenues and other income:
Sales and other operating revenues	$	31,043	$	22,988	$	92,857	$	64,171
Income from equity method investments	124		96		330		262
Net gain on disposal of assets	4		1		222		6
Other income	31		47		96		122
Total revenues and other income	31,202		23,132		93,505		64,561
Costs and expenses:
Cost of revenues (excludes items below)	27,300		20,606		82,942		57,772
Depreciation and amortization	855		555		2,660		1,616
Selling, general and administrative expenses	833		445		2,618		1,271
Other taxes	190		123		550		348
Total costs and expenses	29,178		21,729		88,770		61,007
Income from operations	2,024		1,403		4,735		3,554
Net interest and other financial costs	317		240		945		618
Income before income taxes	1,707		1,163		3,790		2,936
Provision for income taxes	340		222		797		525
Net income	1,367		941		2,993		2,411
Less net income attributable to:
Redeemable noncontrolling interest	20		19		61		55
Noncontrolling interests	252		185		738		527
Net income attributable to MPC	$	1,095	$	737	$	2,194	$	1,829
Per Share Data (See Note 7)
Basic:
Net income attributable to MPC per share	$	1.67	$	1.63	$	3.31	$	3.96
Weighted average shares outstanding	656		451		663		462
Diluted:
Net income attributable to MPC per share	$	1.66	$	1.62	$	3.28	$	3.92
Weighted average shares outstanding	660		456		668		466

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  September 30,						Nine Months Ended  September 30,
(Millions of dollars)	2019			2018			2019			2018
Net income	$	1,367		$	941		$	2,993		$	2,411
Other comprehensive income (loss):
Defined benefit plans:
Actuarial changes, net of tax of ($14), $24, ($8) and $29, respectively	(42		)	75			(46		)	89
Prior service credit, net of tax of ($3), ($3), ($14) and ($7), respectively	(8		)	(7		)	(19		)	(21		)
Other, net of tax of $0, ($1), ($1) and ($2), respectively	(1		)	(3		)	(3		)	(5		)
Other comprehensive income (loss)	(51		)	65			(68		)	63
Comprehensive income	1,316			1,006			2,925			2,474
Less comprehensive income attributable to:
Redeemable noncontrolling interest	20			19			61			55
Noncontrolling interests	252			185			738			527
Comprehensive income attributable to MPC	$	1,044		$	802		$	2,126		$	1,892

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)	September 30, 2019			December 31, 2018
Assets
Current assets:
Cash and cash equivalents	$	1,525		$	1,687
Receivables, less allowance for doubtful accounts of $21 and $9, respectively	7,461			5,853
Inventories	9,696			9,837
Other current assets	457			646
Total current assets	19,139			18,023
Equity method investments	6,725			5,898
Property, plant and equipment, net	45,034			45,058
Goodwill	21,277			20,184
Right of use assets	2,522			—
Other noncurrent assets	3,442			3,777
Total assets	$	98,139		$	92,940
Liabilities
Current liabilities:
Accounts payable	$	11,380		$	9,366
Payroll and benefits payable	939			1,152
Accrued taxes	1,015			1,446
Debt due within one year	557			544
Operating lease liabilities	586			—
Other current liabilities	862			708
Total current liabilities	15,339			13,216
Long-term debt	28,282			26,980
Deferred income taxes	6,180			4,864
Defined benefit postretirement plan obligations	1,487			1,509
Long-term operating lease liabilities	1,962			—
Deferred credits and other liabilities	1,265			1,318
Total liabilities	54,515			47,887
Commitments and contingencies (see Note 23)
Redeemable noncontrolling interest	968			1,004
Equity
MPC stockholders’ equity:
Preferred stock, no shares issued and outstanding (par value $0.01 per share, 30 million shares authorized)	—			—
Common stock:
Issued – 978 million and 975 million shares (par value $0.01 per share, 2 billion shares authorized)	10			10
Held in treasury, at cost – 328 million and 295 million shares	(15,076		)	(13,175		)
Additional paid-in capital	33,125			33,729
Retained earnings	15,891			14,755
Accumulated other comprehensive loss	(212		)	(144		)
Total MPC stockholders’ equity	33,738			35,175
Noncontrolling interests	8,918			8,874
Total equity	42,656			44,049
Total liabilities, redeemable noncontrolling interest and equity	$	98,139		$	92,940

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

5

MARATHON PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Nine Months Ended  September 30,
(Millions of dollars)	2019			2018
Operating activities:
Net income	$	2,993		$	2,411
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred financing costs and debt discount	19			51
Depreciation and amortization	2,660			1,616
Pension and other postretirement benefits, net	(110		)	38
Deferred income taxes	772			42
Net gain on disposal of assets	(222		)	(6		)
Income from equity method investments	(330		)	(262		)
Distributions from equity method investments	473			345
Changes in the fair value of derivative instruments	(34		)	13
Changes in operating assets and liabilities, net of effects of businesses acquired:
Current receivables	(1,615		)	(709		)
Inventories	182			215
Current accounts payable and accrued liabilities	1,942			(316		)
Right of use assets and operating lease liabilities, net	20			—
All other, net	282			(7		)
Net cash provided by operating activities	7,032			3,431
Investing activities:
Additions to property, plant and equipment	(3,823		)	(2,315		)
Acquisitions, net of cash acquired	(129		)	(453		)
Disposal of assets	44			19
Investments – acquisitions, loans and contributions	(792		)	(222		)
– redemptions, repayments and return of capital	75			16
All other, net	50			60
Net cash used in investing activities	(4,575		)	(2,895		)
Financing activities:
Long-term debt – borrowings	13,774			10,735
– repayments	(12,554		)	(5,401		)
Debt issuance costs	(22		)	(53		)
Issuance of common stock	6			24
Common stock repurchased	(1,885		)	(2,612		)
Dividends paid	(1,054		)	(637		)
Distributions to noncontrolling interests	(950		)	(599		)
Contributions from noncontrolling interests	95			9
All other, net	(64		)	(22		)
Net cash provided by (used in) financing activities	(2,654		)	1,444
Net increase (decrease) in cash, cash equivalents and restricted cash	(197		)	1,980
Cash, cash equivalents and restricted cash at beginning of period	1,725			3,015
Cash, cash equivalents and restricted cash at end of period	$	1,528		$	4,995

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

6

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, 2018	975	$	10	(295	)	$	(13,175	)	$	33,729		$	14,755		$	(144	)	$	8,874		$	44,049		$	1,004
Net income (loss)	—	—		—		—			—			(7		)	—			246			239			20
Dividends declared on common stock ($0.53 per share)	—	—		—		—			—			(357		)	—			—			(357		)	—
Distributions to noncontrolling interests	—	—		—		—			—			—			—			(305		)	(305		)	(20		)
Contributions from noncontrolling interests	—	—		—		—			—			—			—			95			95			—
Other comprehensive loss	—	—		—		—			—			—			(7		)	—			(7		)	—
Shares repurchased	—	—		(14	)	(885		)	—			—			—			—			(885		)	—
Stock based compensation	1	—		—		(3		)	32			—			—			(1		)	28			—
Equity transactions of MPLX & ANDX	—	—		—		—			3			—			—			(1		)	2			—
Other	—	—		—		—			—			—			—			(1		)	(1		)	—
Balance as of March 31, 2019	976	$	10	(309	)	$	(14,063	)	$	33,764		$	14,391		$	(151	)	$	8,907		$	42,858		$	1,004
Net income	—	—		—		—			—			1,106			—			240			1,346			21
Dividends declared on common stock ($0.53 per share)	—	—		—		—			—			(351		)	—			—			(351		)	—
Distributions to noncontrolling interests	—	—		—		—			—			—			—			(295		)	(295		)	(20		)
Other comprehensive loss	—	—		—		—			—			—			(10		)	—			(10		)	—
Shares repurchased	—	—		(9	)	(500		)	—			—			—			—			(500		)	—
Stock based compensation	2	—		—		(10		)	19			—			—			2			11			—
Equity transactions of MPLX & ANDX	—	—		—		—			2			—			—			(1		)	1			—
Other	—	—		—		—			—			—			—			1			1			—
Balance as of June 30, 2019	978	$	10	(318	)	$	(14,573	)	$	33,785		$	15,146		$	(161	)	$	8,854		$	43,061		$	1,005
Net income	—	—		—		—			—			1,095			—			252			1,347			20
Dividends declared on common stock ($0.53 per share)	—	—		—		—			—			(350		)	—			—			(350		)	—
Distributions to noncontrolling interests	—	—		—		—			—			—			—			(289		)	(289		)	(21		)
Other comprehensive loss	—	—		—		—			—			—			(51		)	—			(51		)	—
Shares repurchased	—	—		(10	)	(500		)	—			—			—			—			(500		)	—
Stock based compensation	—	—		—		(3		)	31			—			—			2			30			—
Equity transactions of MPLX & ANDX	—	—		—		—			(691		)	—			—			95			(596		)	(36		)
Other	—	—		—		—			—			—			—			4			4			—
Balance as of September 30, 2019	978	$	10	(328	)	$	(15,076	)	$	33,125		$	15,891		$	(212	)	$	8,918		$	42,656		$	968

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, 2017	734	$	7	(248	)	$	(9,869	)	$	11,262	$	12,864		$	(231	)	$	6,795		$	20,828		$	1,000
Cumulative effect of adopting new accounting standards	—	—		—		—			—		63			—			1			64			—
Net income	—	—		—		—			—		37			—			182			219			16
Dividends declared on common stock ($0.46 per share)	—	—		—		—			—		(219		)	—			—			(219		)	—
Distributions to noncontrolling interests	—	—		—		—			—		—			—			(179		)	(179		)	(16		)
Contributions from noncontrolling interests	—	—		—		—			—		—			—			1			1			—
Other comprehensive loss	—	—		—		—			—		—			(2		)	—			(2		)	—
Shares repurchased	—	—		(19	)	(1,327		)	—		—			—			—			(1,327		)	—
Stock based compensation	—	—		—		(4		)	27		—			—			1			24			—
Equity transactions of MPLX & ANDX	—	—		—		—			2,380		—			—			(2,926		)	(546		)	—
Balance as of March 31, 2018	734	$	7	(267	)	$	(11,200	)	$	13,669	$	12,745		$	(233	)	$	3,875		$	18,863		$	1,000
Net income	—	—		—		—			—		1,055			—			160			1,215			20
Dividends declared on common stock ($0.46 per share)	—	—		—		—			—		(211		)	—			—			(211		)	—
Distributions to noncontrolling interests	—	—		—		—			—		—			—			(182		)	(182		)	(17		)
Contributions from noncontrolling interests	—	—		—		—			—		—			—			4			4			—
Shares repurchased	—	—		(12	)	(885		)	—		—			—			—			(885		)	—
Stock based compensation	1	—		—		(8		)	18		—			—			4			14			—
Equity transactions of MPLX & ANDX	—	—		—		—			1		—			—			(1		)	—			—
Balance as of June 30, 2018	735	$	7	(279	)	$	(12,093	)	$	13,688	$	13,589		$	(233	)	$	3,860		$	18,818		$	1,003
Net income	—	$	—	—		$	—		$	—	$	737		$	—		$	185		$	922		$	19
Dividends declared on common stock ($0.46 per share)	—	—		—		—			—		(207		)	—			—			(207		)	—
Distributions to noncontrolling interests	—	—		—		—			—		—			—			(186		)	(186		)	(19		)
Contributions from noncontrolling interests	—	—		—		—			—		—			—			4			4			—
Other comprehensive income	—	—		—		—			—		—			65			—			65			—
Shares repurchased	—	—		(5	)	(400		)	—		—			—			—			(400		)	—
Stock based compensation	—	—		—		(2		)	14		—			—			3			15			—
Equity transactions of MPLX & ANDX	—	—		—		—			1		—			—			(1		)	—			—
Balance as of September 30, 2018	735	$	7	(284	)	$	(12,495	)	$	13,703	$	14,119		$	(168	)	$	3,865		$	19,031		$	1,003

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 with more than 3 million barrels per day of crude oil capacity across 16 refineries. We sell refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market, to consumers through our Retail business segment and to independent entrepreneurs who operate approximately 6,800 branded outlets. Our retail operations own and operate approximately 3,930 retail transportation fuel and convenience stores across the United States and also sell transportation fuel to consumers through approximately 1,070 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.

Refer to Note 4 for further information on the Andeavor acquisition, which closed on October 1, 2018, and to Notes 3 and 9 for additional information about our operations.

Refer to Note 24 for further information on planned separation of MPC’s retail transportation fuel and convenience store business, which is operated primarily under the Speedway brand, into an independent, publicly traded company, and the presentation of the results of that business in our consolidated financial statements.

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, 2018. The results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the full year.

2. ACCOUNTING STANDARDS

Recently Adopted

ASU 2016-02, Leases

We adopted ASU No. 2016-02, Leases (“ASC 842”), as of January 1, 2019, electing the transition method which permits entities to adopt the provisions of the standard using the modified retrospective approach without adjusting comparative periods. We also elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to grandfather the historical accounting conclusions until a reassessment event is present. We have also elected the practical expedient to not recognize short-term leases on the balance sheet, the practical expedient related to right of way permits and land easements which allows us to carry forward our accounting treatment for those existing agreements, and the practical expedient to combine lease and non-lease components for the majority of our underlying classes of assets except for our third-party contractor service and equipment agreements and boat and barge equipment agreements in which we are the lessee. We did not elect the practical expedient to combine lease and non-lease components for arrangements in which we are the lessor. In instances where the practical expedient was not elected, lease and non-lease consideration is allocated based on relative standalone selling price.

Right of use (“ROU”) assets represent our right to use an underlying asset in which we obtain substantially all of the economic benefits and the right to direct the use of the asset during the lease term. Lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and lease liabilities are recognized at commencement date based on the present value of lease payments over the lease term. We recognize ROU assets and lease liabilities on the balance sheet for leases with a lease term of greater than one year. Payments that are not fixed at the commencement of the lease are considered variable and are excluded from the ROU asset and lease liability calculations. In the measurement of our ROU assets and lease liabilities, the fixed lease payments in the agreement are discounted using a secured incremental borrowing rate

9

for a term similar to the duration of the lease, as our leases do not provide implicit rates. Operating lease expense is recognized on a straight-line basis over the lease term.

Adoption of the new standard resulted in the recording of ROU assets and lease liabilities of approximately $2.8 billion and $2.9 billion, respectively, as of January 1, 2019. The standard did not materially impact our consolidated statements of income, cash flows or equity as a result of adoption.

As a lessor under ASC 842, MPLX may be required to re-classify existing operating leases to sales-type leases upon modification and related reassessment of the leases. As modifications occur, it may result in the de-recognition of existing assets and recognition of a receivable in the amount of the present value of fixed payments expected to be received by MPLX under the lease. MPLX will evaluate the impact of lease reassessments as modifications occur.

We also adopted the following ASUs during the first nine months of 2019, none of which had a material impact to our financial statements or financial statement disclosures:

ASU		Effective Date
2018-02	Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	January 1, 2019
2017-12	Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities	January 1, 2019

Not Yet Adopted

ASU 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued an ASU which simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. Under the new guidance, the recognition of an impairment charge is calculated based on the amount by which the carrying amount exceeds the reporting unit’s fair value, which could be different from the amount calculated under the current method using the implied fair value of the goodwill; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The guidance should be applied on a prospective basis and is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019.

ASU 2016-13, Credit Losses - Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued an ASU related to the accounting for credit losses on certain financial instruments. The guidance requires that for most financial assets, losses be based on an expected loss approach which includes estimates of losses over the life of exposure that considers historical, current and forecasted information. Expanded disclosures related to the methods used to estimate the losses as well as a specific disaggregation of balances for financial assets are also required. The change is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. We do not expect application of this ASU to have a material impact on our consolidated financial statements.

3. 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 September 30, 2019 we owned approximately 63 percent of the outstanding MPLX common units.

As described in Notes 4 and 5, we have consolidated Andeavor Logistics LP (“ANDX”) since October 1, 2018 in accordance with ASC 810 and previously recorded ANDX’s assets and liabilities to our balance sheet at preliminary fair values as of the Andeavor acquisition date of October 1, 2018.

On July 30, 2019, MPLX completed its acquisition of ANDX, and ANDX survived as a wholly-owned subsidiary of MPLX. At the effective time of the ANDX acquisition, each common unit held by ANDX’s public unitholders was converted into the right to receive 1.135 MPLX common units. ANDX common units held by MPC were converted into the right to receive 1.0328 MPLX common units. Additionally, as a result of MPLX’s acquisition of ANDX, 600,000 ANDX preferred units were converted into 600,000 preferred units of MPLX (“Series B preferred units”). Series B preferred unitholders are entitled to receive, when and if declared by the board, a fixed distribution of $68.75 per unit, per annum, payable semi-annually in arrears on February 15 and August 15, or the first business day thereafter. MPC accounted for this transaction as a common control transaction, as defined by ASC 805, which resulted in an increase to noncontrolling interest and a decrease to additional paid-in capital of approximately $55 million, net of tax. During the third quarter of 2019, we pushed down to MPLX the portion of the goodwill attributable to ANDX as of October 1, 2018. Due to this push down of goodwill, we also recorded an incremental

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$642 million deferred tax liability associated with the portion of the non-deductible goodwill attributable to the noncontrolling interest in MPLX with an offsetting reduction of our additional paid-in capital balance.

Dropdowns to MPLX and GP/IDR Exchange

On February 1, 2018, we contributed refining logistics assets and fuels distribution services to MPLX in exchange for $4.1 billion in cash and approximately 112 million common units and 2 million general partner units from MPLX. MPLX financed the cash portion of the transaction with a $4.1 billion 364-day term loan facility, which was entered into on January 2, 2018. We agreed to waive approximately one-third of the first quarter 2018 distributions on the common units issued in connection with this transaction. The contributions of these assets were accounted for as transactions between entities under common control and we did not record a gain or loss.

Immediately following the February 1, 2018 dropdown to MPLX, our IDRs were cancelled and our economic general partner interest was converted into a non-economic general partner interest, all in exchange for 275 million newly issued MPLX common units (“GP/IDR Exchange”). As a result of this transaction, the general partner units and IDRs were eliminated, are no longer outstanding and no longer participate in distributions of cash from MPLX.

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 and ANDX, 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 and ANDX were as follows:

	Nine Months Ended  September 30,
(In millions)	2019			2018
Increase due to the issuance of MPLX common units and general partner units to MPC	$	—		$	1,114
Increase due to GP/IDR Exchange	—			1,808
Increase (decrease) due to the issuance of MPLX & ANDX common units	(52		)	6
Increase (decrease) in MPC's additional paid-in capital	(52		)	2,928
Tax impact	(634		)	(546		)
Increase (decrease) in MPC's additional paid-in capital, net of tax	$	(686	)	$	2,382

4. ACQUISITIONS

Acquisition of Andeavor

On October 1, 2018, we acquired Andeavor. The total value of consideration transferred was $23.46 billion, consisting of $19.97 billion in equity and $3.49 billion in cash. The cash portion of the purchase price was funded using cash on hand. Our financial results reflect the results of Andeavor from the date of the acquisition.

We accounted for the Andeavor acquisition using the acquisition method of accounting, which requires Andeavor assets and liabilities to be recorded to our balance sheet at fair value as of the acquisition date. The size and the breadth of the Andeavor acquisition necessitated the use of the one year measurement period provided under ASC 805 to fully analyze all the factors used in establishing the asset and liability fair values as of the acquisition date. We completed a final determination of the fair value of certain assets and liabilities during the three months ended September 30, 2019 and recorded adjustments to our preliminary purchase price allocation. These adjustments reflect the completion of valuation studies of the acquired property, plant and equipment in order to finalize assumptions used in their cost approach valuation methodology and finalization of specific valuation assumptions and data inputs for other individual asset valuation models. The fair value estimates of assets acquired and liabilities assumed as of the acquisition date are noted in the table below.

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(In millions)	As originally reported		Adjustments			As adjusted
Cash and cash equivalents	$	382	$	—		$	382
Receivables	2,744		(7		)	2,737
Inventories	5,204		37			5,241
Other current assets	378		(6		)	372
Equity method investments	865		(113		)	752
Property, plant and equipment, net	16,545		(1,059		)	15,486
Other noncurrent assets(a)	3,086		(11		)	3,075
Total assets acquired	29,204		(1,159		)	28,045
Accounts payable	4,003		(41		)	3,962
Payroll and benefits payable	348		9			357
Accrued taxes	590		(110		)	480
Debt due within one year	34					34
Other current liabilities	392		27			419
Long-term debt	8,875		1			8,876
Deferred income taxes	1,609		(60		)	1,549
Defined benefit postretirement plan obligations	432		—			432
Deferred credit and other liabilities	714		33			747
Noncontrolling interests	5,059		3			5,062
Total liabilities and noncontrolling interest assumed	22,056		(138		)	21,918
Net assets acquired excluding goodwill	7,148		(1,021		)	6,127
Goodwill	16,314		1,021			17,335
Net assets acquired	$	23,462	$	—		$	23,462

^(a)  Includes intangible assets.

The purchase consideration allocation resulted in the recognition of $17.3 billion in goodwill, of which $1.0 billion is tax deductible due to a carryover basis from Andeavor. Our Refining & Marketing, Midstream and Retail segments recognized $5.2 billion, $8.1 billion and $4.0 billion of goodwill, respectively. The recognized goodwill represents the value expected to be created by further optimization of crude supply, a nationwide retail and marketing platform, diversification of our refining and midstream footprints and optimization of information systems and business processes.

Pro Forma Financial Information

The following unaudited pro forma financial information presents consolidated results assuming the Andeavor acquisition occurred on January 1, 2017. The unaudited pro forma information does not give effect to potential synergies that could result from the transaction and is not necessarily indicative of the results of future operations.

	Three Months Ended  September 30,		Nine Months Ended  September 30,
(In millions)	2018		2018
Sales and other operating revenues	$	35,250	$	99,588
Net income attributable to MPC	1,057		2,562

The pro forma information includes adjustments to align accounting policies, including our policy to expense refinery turnarounds when they occur, an adjustment to depreciation expense to reflect the increased fair value of property, plant and equipment, increased amortization expense related to identifiable intangible assets and the related income tax effects.

Acquisition of Terminal and Retail Locations in Buffalo, New York

During the third quarter of 2019, we acquired a 900,000-barrel capacity light product and asphalt terminal and 33 NOCO Express retail stores in Buffalo, Syracuse and Rochester, New York, from NOCO Incorporated for total consideration of $135 million.

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Based on the final fair value estimates of assets acquired and liabilities assumed at the acquisition date, $38 million of the purchase price was allocated to property, plant and equipment, $3 million to inventory and $94 million to goodwill. Goodwill is tax deductible and represents the value expected to be created by geographically expanding our retail platform and the assembled workforce. The terminal is accounted for within the R&M segment and the retail stores are accounted for within the Retail segment.

Acquisition of Express Mart

During the fourth quarter of 2018, Speedway acquired 78 transportation fuel and convenience store locations from Petr-All Petroleum Consulting Corporation for total consideration of $266 million. These stores are located primarily in the Syracuse, Rochester and Buffalo markets in New York and had been operated under the Express Mart brand.

Based on the final fair value estimates of assets acquired and liabilities assumed at the acquisition date, $97 million of the purchase price was allocated to property, plant and equipment, $9 million to inventory, $2 million to intangibles and $158 million to goodwill. Goodwill is tax deductible and represents the value expected to be created by geographically expanding our retail platform and the assembled workforce. These operations are accounted for within the Retail segment.

Acquisition of Mt. Airy Terminal

On September 26, 2018, MPLX acquired an eastern U.S. Gulf Coast export terminal (“Mt. Airy Terminal”) from Pin Oak Holdings, LLC for total consideration of $451 million. At the time of the acquisition, the terminal included tanks with 4 million barrels of third-party leased storage capacity and a dock with 120 mbpd of capacity. The Mt. Airy Terminal is located on the Mississippi River between New Orleans and Baton Rouge, near several Gulf Coast refineries, including our Garyville Refinery, and numerous rail lines and pipelines. The Mt. Airy Terminal is accounted for within the Midstream segment. In the first quarter of 2019, an adjustment to the initial purchase price was made for approximately $5 million related to the final settlement of the acquisition. This reduced the total purchase price to $446 million and resulted in $336 million of property, plant and equipment, $121 million of goodwill and the remainder being attributable to net liabilities assumed.

Goodwill represents the significant growth potential of the terminal due to the multiple pipelines and rail lines which cross the property, the terminal’s position as an aggregation point for liquids growth in the region for both ocean-going vessels and inland barges, the proximity of the terminal to MPC’s Garyville refinery and other refineries in the region as well as the opportunity to construct an additional dock at the site. All of the goodwill recognized related to this transaction is tax deductible.

Assuming the acquisition of the terminal and retail locations from NOCO Incorporated had occurred on January 1, 2018 and the acquisitions of Express Mart and Mt. Airy Terminal had occurred on January 1, 2017, the consolidated pro forma results would not have been materially different from the reported results.

5. VARIABLE INTEREST ENTITIES

Consolidated VIE

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

The creditors of MPLX do not have recourse to MPC’s general credit through guarantees or other financial arrangements, except as noted. MPC has effectively guaranteed certain indebtedness of LOOP LLC (“LOOP”) and LOCAP LLC (“LOCAP”), in which MPLX holds an interest. See Note 23 for more information. The assets of MPLX can only be used to settle their own obligations and their creditors have no recourse to our assets, except as noted earlier.

We have consolidated ANDX since October 1, 2018 in accordance with ASC 810. The ANDX balances at December 31, 2018 reflected in the table below are ANDX’s historical balances as the preliminary purchase accounting adjustments related to ANDX’s assets and liabilities in connection with the Andeavor acquisition had not yet been pushed down to ANDX. On July 30, 2019, MPLX acquired ANDX. The MPLX balances at September 30, 2019 reflect the inclusion of ANDX’s balances at the fair values determined in connection with MPC’s acquisition of Andeavor on October 1, 2018. See Notes 3 and 4 for additional information.

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

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	September 30, 2019		December 31, 2018
(In millions)	MPLX		MPLX		ANDX
Assets
Cash and cash equivalents	$	41	$	68	$	10
Receivables, less allowance for doubtful accounts	592		425		199
Inventories	104		77		22
Other current assets	71		45		57
Equity method investments	5,182		4,174		602
Property, plant and equipment, net	21,921		14,639		6,845
Goodwill	10,735		2,586		1,051
Right of use assets	366		—		—
Other noncurrent assets	1,364		458		1,242
Liabilities
Accounts payable	$	756	$	776	$	215
Payroll and benefits payable	5		2		10
Accrued taxes	96		48		23
Debt due within one year	510		1		504
Operating lease liabilities	61		—		—
Other current liabilities	276		177		77
Long-term debt	19,190		13,392		4,469
Deferred income taxes	15		13		1
Long-term operating lease liabilities	309		—		—
Deferred credits and other liabilities	383		276		68

6. RELATED PARTY TRANSACTIONS

Transactions with related parties were as follows:

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions)	2019		2018		2019		2018
Sales to related parties(a)	$	186	$	201	$	558	$	572
Purchases from related parties(b)	184		149		571		428

^(a)   Sales to related parties, which are included in sales and other operating revenues, consist primarily of sales of refined products to PFJ Southeast, an equity affiliate which owns and operates travel plazas primarily in the Southeast region of the United States.

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

7. EARNINGS PER SHARE

We compute basic earnings per share by dividing net income attributable to MPC less income allocated to participating securities by the weighted average number of shares of common stock outstanding. Since MPC grants certain incentive compensation awards to employees and non-employee directors that are considered to be participating securities, we have calculated our earnings per share using the two-class method. Diluted income per share assumes exercise of certain stock-based compensation awards, provided the effect is not anti-dilutive.

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	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions, except per share data)	2019		2018		2019		2018
Basic earnings per share:
Allocation of earnings:
Net income attributable to MPC	$	1,095	$	737	$	2,194	$	1,829
Income allocated to participating securities	—		—		1		1
Income available to common stockholders – basic	$	1,095	$	737	$	2,193	$	1,828
Weighted average common shares outstanding	656		451		663		462
Basic earnings per share	$	1.67	$	1.63	$	3.31	$	3.96
Diluted earnings per share:
Allocation of earnings:
Net income attributable to MPC	$	1,095	$	737	$	2,194	$	1,829
Income allocated to participating securities	—		—		1		1
Income available to common stockholders – diluted	$	1,095	$	737	$	2,193	$	1,828
Weighted average common shares outstanding	656		451		663		462
Effect of dilutive securities	4		5		5		4
Weighted average common shares, including dilutive effect	660		456		668		466
Diluted earnings per share	$	1.66	$	1.62	$	3.28	$	3.92

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

	Three Months Ended  September 30,		Nine Months Ended  September 30,
(In millions)	2019	2018	2019	2018
Shares issuable under stock-based compensation plans	4	—	3	—

8. EQUITY

As of September 30, 2019, we had $3.02 billion of remaining share repurchase authorizations from our board of directors. We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, 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.

Total share repurchases were as follows for the respective periods:

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions, except per share data)	2019		2018		2019		2018
Number of shares repurchased	10		5		33		36
Cash paid for shares repurchased	$	500	$	400	$	1,885	$	2,612
Average cost per share	$	53.82	$	73.03	$	58.75	$	71.80

As of September 30, 2019, we had agreements to acquire 97,078 common shares for $6 million, which settled in early October 2019.

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9. SEGMENT INFORMATION

We have three reportable segments: Refining & Marketing; Retail; 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 16 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, to our Retail business segment and to independent entrepreneurs who operate primarily Marathon^® branded outlets.

• Retail – sells transportation fuels and convenience products in the retail market across the United States through company-owned and operated convenience stores, primarily under the Speedway^® brand, and long-term fuel supply contracts with direct dealers who operate locations primarily 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 from operations attributable to the reportable segments. Corporate administrative expenses, except for those attributable to MPLX, and costs related to certain non-operating assets are not allocated to the Refining & Marketing and Retail segments. In addition, certain items that affect comparability (as determined by the chief operating decision maker) are not allocated to the reportable segments.

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2019
Revenues:
Third party(a)	$	21,437	$	8,677	$	929	$	31,043
Intersegment	5,100		2		1,235		6,337
Segment revenues	$	26,537	$	8,679	$	2,164	$	37,380
Segment income from operations	$	883	$	442	$	919	$	2,244
Supplemental Data
Depreciation and amortization(b)	$	397	$	113	$	300	$	810
Capital expenditures and investments(c)	561		177		783		1,521

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2018
Revenues:
Third party(a)	$	16,751	$	5,395	$	842	$	22,988
Intersegment	2,931		1		787		3,719
Segment revenues	$	19,682	$	5,396	$	1,629	$	26,707
Segment income from operations	$	666	$	161	$	679	$	1,506
Supplemental Data
Depreciation and amortization(b)	$	257	$	76	$	205	$	538
Capital expenditures and investments(c)	226		98		593		917

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(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2019
Revenues:
Third party(a)	$	65,043	$	24,997	$	2,817	$	92,857
Intersegment	15,011		6		3,685		18,702
Segment revenues	$	80,054	$	25,003	$	6,502	$	111,559
Segment income from operations	$	1,455	$	1,105	$	2,705	$	5,265
Supplemental Data
Depreciation and amortization(b)	$	1,235	$	369	$	925	$	2,529
Capital expenditures and investments(c)	1,385		370		2,420		4,175

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2018
Revenues:
Third party(a)	$	46,635	$	15,231	$	2,305	$	64,171
Intersegment	8,181		4		2,180		10,365
Segment revenues	$	54,816	$	15,235	$	4,485	$	74,536
Segment income from operations	$	1,558	$	415	$	1,863	$	3,836
Supplemental Data
Depreciation and amortization(b)	$	761	$	228	$	577	$	1,566
Capital expenditures and investments(c)	613		225		1,676		2,514

^(a)  Includes related party sales. See Note 6 for additional information.

^(b)  Differences between segment totals and MPC consolidated totals represent amounts related to corporate and other unallocated items and are included in items not allocated to segments in the reconciliation below.

^(c)  Capital expenditures include changes in capital accruals and investments in affiliates. See reconciliation from segment totals to MPC consolidated total capital expenditures below.

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

	Three Months Ended  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Segment income from operations	$	2,244		$	1,506		$	5,265		$	3,836
Items not allocated to segments:
Corporate and other unallocated items(a)	(198		)	(99		)	(568		)	(269		)
Capline restructuring gain(b)	—			—			207			—
Transaction-related costs(c)	(22		)	(4		)	(147		)	(14		)
Litigation	—			—			(22		)	—
Impairments	—			—			—			1
Income from operations	2,024			1,403			4,735			3,554
Net interest and other financial costs	317			240			945			618
Income before income taxes	$	1,707		$	1,163		$	3,790		$	2,936

^(a)  Corporate and other unallocated items 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. Corporate overhead expenses are not allocated to the Refining & Marketing and Retail segments.

^(b)  See Note 13.

^(c)  The transaction-related costs recognized in the 2019 year-to-date period include the recognition of an obligation for employee benefits provided to former Andeavor employees.

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

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions)	2019		2018		2019		2018
Segment capital expenditures and investments	$	1,521	$	917	$	4,175	$	2,514
Less investments in equity method investees	197		104		792		222
Plus items not allocated to segments:
Corporate	30		7		44		42
Capitalized interest	32		21		97		55
Total capital expenditures(a)	$	1,386	$	841	$	3,524	$	2,389

^(a)  Capital expenditures include changes in capital accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2019 and 2018 as reported in the consolidated statements of cash flows.

10. NET INTEREST AND OTHER FINANCIAL COSTS

Net interest and other financial costs were as follows:

	Three Months Ended  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Interest income	$	(12	)	$	(26	)	$	(30	)	$	(71	)
Interest expense	352			233			1,042			675
Interest capitalized	(45		)	(21		)	(112		)	(55		)
Pension and other postretirement non-service costs(a)	6			45			6			47
Loss on extinguishment of debt	—			—			—			4
Other financial costs	16			9			39			18
Net interest and other financial costs	$	317		$	240		$	945		$	618

^(a)  See Note 21.

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11. INCOME TAXES

The combined federal, state and foreign income tax rate was 20 percent and 19 percent for the three months ended September 30, 2019 and 2018, respectively, and 21 percent and 18 percent for the nine months ended September 30, 2019 and 2018, respectively. The effective tax rate for the three months ended September 30, 2019 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interests offset by equity compensation and state and local tax expense. The effective tax rate for the nine months ended September 30, 2019 was equal to the U.S. statutory rate of 21 percent primarily due to $36 million of state deferred tax expense recorded as an out of period adjustment, offset by permanent tax differences related to net income attributable to noncontrolling interests. The effective tax rate for the three and nine months ended September 30, 2018 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interest offset by state and local tax expense.

During the first quarter of 2019, MPC’s deferred tax liabilities increased $68 million with an offsetting increase to goodwill and the provision for income taxes of $32 million and $36 million, respectively for an out of period adjustment to correct the tax effects recorded in 2018 related to the Andeavor acquisition. The impact of the adjustment was not material to any previous period.

We are continuously undergoing examination of our income tax returns, which have been completed through the 2006 tax year for state returns and the 2008 tax year for our U.S. federal return. As of September 30, 2019, we had $201 million of unrecognized tax benefits.

Prior to its spinoff on June 30, 2011, Marathon Petroleum Corporation was included in the Marathon Oil Corporation (“Marathon Oil”) U.S. federal income tax returns for all applicable years. During the third quarter of 2017, Marathon Oil received a notice of Final Partnership Administrative Adjustment (“FPAA”) from the U.S. Internal Revenue Service for taxable year 2010, relating to certain partnership transactions. Marathon Oil filed a U.S. Tax Court petition disputing these adjustments during the fourth quarter of 2017. We received an FPAA for taxable years 2011-2014 for items resulting from this matter and filed a U.S. Tax Court petition for tax years 2011-2014 to dispute these corollary adjustments in the fourth quarter of 2017. In the third quarter of 2019, the U.S. Tax court entered a decision in favor of both Marathon Oil and us for all material items and the U.S. Internal Revenue Service is in the process of preparing the final reports for these tax years.

Pursuant to our tax sharing agreement with Marathon Oil, the unrecognized tax benefits related to pre-spinoff operations for which Marathon Oil was the taxpayer remain the responsibility of Marathon Oil and we have indemnified Marathon Oil accordingly. See Note 23 for indemnification information.

12. INVENTORIES

(In millions)	September 30, 2019		December 31, 2018
Crude oil and refinery feedstocks	$	3,415	$	3,655
Refined products	5,152		5,234
Materials and supplies	907		720
Merchandise	222		228
Total	$	9,696	$	9,837

Inventories are carried at the lower of cost or market value. The cost of inventories of crude oil and refinery feedstocks, refined products and merchandise is determined primarily under the LIFO method. There were no LIFO inventory liquidations recognized for the nine months ended September 30, 2019.

13. EQUITY METHOD INVESTMENTS

During the three months ended March 31, 2019, we executed agreements with Capline Pipeline Company LLC (“Capline LLC”) to contribute our 33 percent undivided interest in Capline pipeline system in exchange for a 33 percent ownership interest in Capline LLC. In connection with our execution of these agreements, Capline LLC initiated a binding open season for southbound service from Patoka, IL to St. James, LA or Liberty, MS, with an additional origination point at Cushing, OK. Service from Cushing, OK is part of a joint tariff with Diamond pipeline. Crude oil service is expected to begin in the first half of 2021.

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In accordance with ASC 810, we derecognized our undivided interest amounting to $143 million of net assets and recognized the Capline LLC ownership interest we received at fair value. We used an income approach to determine the fair value of our ownership interest under a Monte Carlo simulation method. We estimated the fair value of our ownership interest to be $350 million as of January 30, 2019. This is a nonrecurring fair value measurement and is categorized in level 3 of the fair value hierarchy. The Monte Carlo simulation inputs include ranges of tariff rates, operating volumes, operating cost and capital expenditure assumptions. The estimated cash flows were discounted using a Monte Carlo market participant weighted average cost of capital estimate. None of the inputs to the Monte Carlo simulation are individually significant. The excess of the estimated fair value of our ownership interest over the carrying value of the derecognized net assets resulted in a $207 million non-cash net gain recorded as a net gain on disposal of assets in the accompanying consolidated statements of income.

As the Capline system is currently idled, Capline LLC is unable to fund its operations without financial support from its equity owners and is a VIE. MPC is not deemed to be the primary beneficiary, due to our inability to unilaterally control significant decision-making rights. Our maximum exposure to loss as a result of our involvement with Capline LLC includes our equity investment, any additional capital contribution commitments and any operating expenses incurred by Capline LLC in excess of compensation received for performance of the operating services.

14. PROPERTY, PLANT AND EQUIPMENT

(In millions)	September 30, 2019		December 31, 2018
Refining & Marketing	$	28,470	$	27,590
Retail	6,939		6,637
Midstream	26,652		25,692
Corporate and Other	1,229		1,294
Total	63,290		61,213
Less accumulated depreciation	18,256		16,155
Property, plant and equipment, net	$	45,034	$	45,058

15. FAIR VALUE MEASUREMENTS

Fair Values—Recurring

The following tables present assets and liabilities accounted for at fair value on a recurring basis as of September 30, 2019 and December 31, 2018 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.

 

	September 30, 2019
	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	$	176	$	9	$	—	$	(161	)	$	24	$	77
Liabilities:
Commodity contracts	$	165	$	12	$	—	$	(176	)	$	1	$	—
Embedded derivatives in commodity contracts	—		—		54		—			54		—

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	December 31, 2018
	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	$	370	$	31	$	—	$	(323	)	$	78	$	2
Liabilities:
Commodity contracts	$	255	$	37	$	—	$	(284	)	$	8	$	—
Embedded derivatives in commodity contracts	—		—		61		—			61		—

^(a)  Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of September 30, 2019, cash collateral of $15 million was netted with the mark-to-market derivative liabilities. As of December 31, 2018, cash collateral of $52 million was netted with mark-to-market derivative assets and $13 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.

Commodity derivatives in Level 1 are 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 in the fair value hierarchy.

Level 2 instruments are valued based on quoted prices for similar assets and liabilities in active markets, and inputs other than quoted prices, such as liquidity, that are observable for the asset or liability. Commodity derivatives in Level 2 are OTC contracts, which are valued using market quotations from independent price reporting agencies, third-party brokers and commodity exchange price curves that are corroborated with market data.

Level 3 instruments are OTC NGL contracts and embedded derivatives in commodity contracts. The embedded derivative liability relates to a natural gas purchase agreement embedded in a keep‑whole processing agreement. The fair value calculation for these Level 3 instruments at September 30, 2019 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.41 to $1.07 per gallon and (2) the probability of renewal of 93 percent for the first five-term and 82.5 percent for the second five-term of the natural gas purchase agreement and the related keep-whole processing agreement. For these contracts, increases in forward NGL prices result in a decrease in the fair value of the derivative assets and an increase in the fair value of the derivative liabilities. Increases or decreases in the fractionation spread result in an increase or decrease in the fair value of the embedded derivative liability. An increase in the probability of renewal would result in an increase in the fair value of the related embedded derivative liability.

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

	Three Months Ended  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Beginning balance	$	65		$	68		$	61		$	66
Unrealized and realized losses included in net income	(9		)	20			(2		)	29
Settlements of derivative instruments	(2		)	(4		)	(5		)	(11		)
Ending balance	$	54		$	84		$	54		$	84
The amount of total losses for the period included in earnings attributable to the change in unrealized losses relating to assets still held at the end of period:	$	(9	)	$	21		$	(5	)	$	22

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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 and term loan facility, 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 $28.3 billion and $30.2 billion at September 30, 2019, respectively, and approximately $27.0 billion and $26.5 billion at December 31, 2018, respectively. These carrying and fair values of our debt exclude the unamortized issuance costs which are netted against our total debt.

16. DERIVATIVES

For further information regarding the fair value measurement of derivative instruments, including any effect of master netting agreements or collateral, see Note 15. 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 and (6) the purchase of natural gas.

The following table presents the fair value of derivative instruments as of September 30, 2019 and December 31, 2018 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)	September 30, 2019
Balance Sheet Location	Asset		Liability
Commodity derivatives
Other current assets	$	184	$	176
Other current liabilities(a)	1		6
Deferred credits and other liabilities(a)	—		49

(In millions)	December 31, 2018
Balance Sheet Location	Asset		Liability
Commodity derivatives
Other current assets	$	400	$	283
Other current liabilities(a)	1		16
Deferred credits and other liabilities(a)	—		54

^(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 September 30, 2019. 

	Percentage of contracts that expire next quarter	Position
(Units in thousands of barrels)		Long	Short
Exchange-traded(a)
Crude oil	92.1%	35,825	40,897
Refined products	97.1%	17,014	11,258
Blending products	84.2%	2,750	7,708
OTC
Crude oil	100.0%	160	—
Blending products	100.0%	313	313

^(a)  Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 6,520 long and 1,500 short; Refined products - 925 long and 225 short; Blending products - 257 long and 182 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 September 30,						Nine Months Ended  September 30,
Income Statement Location	2019			2018			2019			2018
Sales and other operating revenues	$	(1	)	$	3		$	(18	)	$	1
Cost of revenues	50			(69		)	(15		)	(152		)
Total	$	49		$	(66	)	$	(33	)	$	(151	)

17. DEBT

Our outstanding borrowings at September 30, 2019 and December 31, 2018 consisted of the following:

(In millions)	September 30, 2019			December 31, 2018
Marathon Petroleum Corporation	$	9,174		$	9,114
MPLX LP	20,120			13,856
ANDX(a)	—			5,010
Total debt	$	29,294		$	27,980
Unamortized debt issuance costs	(137		)	(128		)
Unamortized discount	(318		)	(328		)
Amounts due within one year	(557		)	(544		)
Total long-term debt due after one year	$	28,282		$	26,980

^(a)  On July 30, 2019, MPLX acquired ANDX and assumed its debt obligations. See Note 3 and the discussion below for additional information. The ANDX December 31, 2018 balance includes senior notes of $3,750 million, borrowings under the revolving and dropdown credit facilities of $1,245 million and capital leases of $15 million.

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Available Capacity under our Facilities

(Dollars in millions)	Total Capacity		Outstanding Borrowings		Outstanding Letters of Credit		Available Capacity		Weighted Average Interest Rate		Expiration
MPC 364-day bank revolving credit facility	$	1,000	$	—	$	—	$	1,000	—		September 2020
MPC bank revolving credit facility	5,000		—		1		4,999		—		October 2023
MPC trade receivables securitization facility	750		—		—		750		—		July 2021
MPLX bank revolving credit facility	3,500		—		3		3,497		—		July 2024
MPLX term loan facility	1,000		500		—		500		2.795	%	September 2021

MPC 364-Day Bank Revolving Credit Facility

On July 26, 2019, we entered into a new $1 billion 364-day revolving credit facility with a syndicate of banks that become effective upon the expiration of our existing $1 billion 364-day revolving credit facility in September 2019. The new 364-day revolving credit facility contains substantially the same terms and conditions as our existing 364-day revolving credit facility and will expire in September 2020.

MPC Trade Receivables Securitization Facility

On July 19, 2019, we amended our $750 million trade receivables securitization facility to extend the maturity date to July 16, 2021.

MPLX Credit Agreement

Upon the completion of the merger of MPLX and ANDX on July 30, 2019, the MPLX bank revolving credit facility was amended and restated to increase the borrowing capacity to $3.5 billion and to extend the maturity date to July 30, 2024. The ANDX revolving and dropdown credit facilities were terminated and all outstanding balances were repaid and funded with the new $3.5 billion bank revolving credit facility.

MPLX Term Loan

On September 26, 2019, MPLX entered into a term loan agreement with a syndicate of lenders providing for borrowings up to $1 billion available to be drawn in up to four separate borrowings. If not fully utilized, the term loan commitments expire 90 days after September 26, 2019. Borrowings under the term loan agreement bear interest, at MPLX’s election, at either the Adjusted LIBO Rate (as defined in the term loan agreement) plus a margin or the Alternate Base Rate (as defined in the term loan agreement) plus a margin. The applicable margin to the benchmark interest rates fluctuate from time-to-time based on our credit ratings. The proceeds from borrowings under the term loan agreement are to be used to fund the repayment of MPLX’s existing indebtedness and/or for general business purposes. The term loan agreement matures on September 26, 2021 and may be prepaid at any time without premium or penalty.

The term loan agreement contains representations and warranties, affirmative and negative covenants and events of default that we consider to be customary for an agreement of this type and are substantially similar to MPLX’s existing revolving credit facility, including a covenant that requires MPLX’s ratio of Consolidated Total Debt to Consolidated EBITDA (as both terms are defined in the Term Loan Agreement) for the four prior fiscal quarters not to exceed 5.0 to 1.0 as of the last day of each fiscal quarter (or during the six-month period following certain acquisitions, 5.5 to 1.0). Consolidated EBITDA is subject to adjustments for certain acquisitions completed and capital projects undertaken during the relevant period.

MPLX Floating Rate Senior Notes

On September 9, 2019, MPLX issued $2 billion aggregate principal amount of floating rate senior notes in a public offering, consisting of $1 billion aggregate principal amount of notes due September 2021 and $1 billion aggregate principal amount of notes due September 2022. The proceeds were used to repay various outstanding MPLX borrowings and for general business purposes. Interest is payable quarterly in March, June, September and December, commencing on December 9, 2019. The interest rate applicable to the floating rate senior notes due September 2021 is LIBOR plus 0.9% while the interest rate applicable to the floating rate senior notes due September 2022 is LIBOR plus 1.1%.

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MPLX Senior Notes

In connection with the merger of MPLX and ANDX, MPLX assumed ANDX’s outstanding senior notes which had an aggregate principal amount of $3.75 billion, with interest rates ranging from 3.5% to 6.375% and maturity dates ranging from 2019 to 2047. On September 23, 2019, approximately $3.06 billion aggregate principal amount of ANDX’s outstanding senior notes were exchanged for new unsecured senior notes issued by MPLX having the same maturity and interest rates as the ANDX senior notes in an exchange offer and consent solicitation undertaken by MPLX, leaving approximately $690 million aggregate principal of outstanding senior notes held by ANDX. Of this, $500 million was related to the 5.5% unsecured senior notes due 2019. The principal amount of $500 million and accrued interest of $14 million was paid on October 15, 2019 and includes interest through the payoff date.

18. REVENUE

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

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2019
Refined products	$	20,330	$	6,956	$	176	$	27,462
Merchandise	1		1,697		—		1,698
Crude oil and refinery feedstocks	945		—		41		986
Midstream services and other	161		24		712		897
Sales and other operating revenues	$	21,437	$	8,677	$	929	$	31,043

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2018
Refined products	$	15,636	$	4,051	$	238	$	19,925
Merchandise	1		1,339		—		1,340
Crude oil and refinery feedstocks	1,009		—		60		1,069
Midstream services and other	105		5		544		654
Sales and other operating revenues	$	16,751	$	5,395	$	842	$	22,988

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2019
Refined products	$	60,963	$	20,206	$	593	$	81,762
Merchandise	3		4,719		—		4,722
Crude oil and refinery feedstocks	3,682		—		145		3,827
Midstream services and other	395		72		2,079		2,546
Sales and other operating revenues	$	65,043	$	24,997	$	2,817	$	92,857

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2018
Refined products	$	43,493	$	11,462	$	649	$	55,604
Merchandise	3		3,753		—		3,756
Crude oil and refinery feedstocks	2,871		—		154		3,025
Midstream services and other	268		16		1,502		1,786
Sales and other operating revenues	$	46,635	$	15,231	$	2,305	$	64,171

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 September 30, 2019, we do not have future performance obligations that are material to future periods.

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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 September 30, 2019 include matching buy/sell receivables of $2.25 billion.

19. SUPPLEMENTAL CASH FLOW INFORMATION

	Nine Months Ended  September 30,
(In millions)	2019		2018
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$	871	$	520
Net income taxes paid to taxing authorities	376		153
Cash paid for amounts included in the measurement of lease liabilities
Payments on operating leases(a)	572		—
Interest payments under finance lease obligations(a)	25		—
Net cash provided by financing activities included:
Principal payments under finance lease obligations(a)	35		—
Non-cash investing and financing activities:
Capital leases	—		171
Right of use assets obtained in exchange for new operating lease obligations(a)	235		—
Right of use assets obtained in exchange for new finance lease obligations(a)	87		—
Contribution of net assets to Capline LLC(b)	143		—
Recognition of Capline LLC equity method investment(b)	350		—

^(a)  Disclosure added in 2019 following the adoption of ASC 842.

^(b)   See Note 13.

(In millions)	September 30, 2019		December 31, 2018
Cash and cash equivalents	$	1,525	$	1,687
Restricted cash(a)	3		38
Cash, cash equivalents and restricted cash	$	1,528	$	1,725

^(a)  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:

	Nine Months Ended  September 30,
(In millions)	2019			2018
Additions to property, plant and equipment per the consolidated statements of cash flows	$	3,823		$	2,315
Asset retirement expenditures	1			7
Increase (decrease) in capital accruals	(300		)	67
Total capital expenditures	$	3,524		$	2,389

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20. 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, 2017	$	(190	)	$	(48	)	$	4		$	3		$	(231	)
Other comprehensive income (loss) before reclassifications, net of tax of $10	35			(1		)	(2		)	—			32
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(25		)	(2		)	—			—			(27		)
– actuarial loss(a)	26			(1		)	—			—			25
– settlement loss(a)	47			—			—			—			47
Other	—			—			—			(4		)	(4		)
Tax effect	(12		)	1			—			1			(10		)
Other comprehensive income (loss)	71			(3		)	(2		)	(3		)	63
Balance as of September 30, 2018	$	(119	)	$	(51	)	$	2		$	—		$	(168	)

(In millions)	Pension Benefits			Other Benefits			Gain on Cash Flow Hedge		Workers Compensation			Total
Balance as of December 31, 2018	$	(132	)	$	(23	)	$	2	$	9		$	(144	)
Other comprehensive income (loss) before reclassifications, net of tax of ($20)	(58		)	1			—		—			(57		)
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(34		)	—			—		—			(34		)
– actuarial loss(a)	16			(1		)	—		—			15
– settlement loss(a)	9			—			—		—			9
Other	—			—			—		(4		)	(4		)
Tax effect	2			—			—		1			3
Other comprehensive loss	(65		)	—			—		(3		)	(68		)
Balance as of September 30, 2019	$	(197	)	$	(23	)	$	2	$	6		$	(212	)

^(a)  These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.

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21. PENSION AND OTHER POSTRETIREMENT BENEFITS

The following summarizes the components of net periodic benefit costs:

	Three Months Ended September 30, 2019
	Pension Benefits						Other Benefits
(In millions)	2019			2018			2019		2018
Components of net periodic benefit cost:
Service cost	$	57		$	36		$	8	$	7
Interest cost	27			18			9		7
Expected return on plan assets	(31		)	(25		)	—		—
Amortization – prior service credit	(11		)	(9		)	—		—
– actuarial loss	5			9			—		(1		)
– settlement loss	7			45			—		—
Net periodic benefit cost	$	54		$	74		$	17	$	13

	Nine Months Ended September 30,
	Pension Benefits						Other Benefits
(In millions)	2019			2018			2019			2018
Components of net periodic benefit cost:
Service cost	$	175		$	107		$	24		$	22
Interest cost	82			54			28			22
Expected return on plan assets	(94		)	(75		)	—			—
Amortization – prior service credit	(34		)	(25		)	—			(2		)
– actuarial loss	16			26			(1		)	(1		)
– settlement loss	9			47			—			—
Net periodic benefit cost	$	154		$	134		$	51		$	41

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 nine months ended September 30, 2019, we made contributions of $267 million to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $16 million and $32 million, respectively, during the nine months ended September 30, 2019.

22. LEASES

For further information regarding the adoption of ASC 842, including the method of adoption and practical expedients elected, see Note 2.

Lessee

We lease a wide variety of facilities and equipment including land and building space, office and field equipment, storage facilities and transportation equipment. Our remaining lease terms range from less than one year to 60 years. Most long-term leases include renewal options ranging from less than one year to 50 years and, in certain leases, also include purchase options. The lease term included in the measurement of right of use assets and lease liabilities includes options to extend or terminate our leases that we are reasonably certain to exercise. Options were included in the lease term primarily for retail store sites where we constructed property, plant and equipment on leased land that is expected to exist beyond the initial lease term.

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Under ASC 842, the components of lease cost were as follows:

	Three Months Ended  September 30,		Nine Months Ended  September 30,
(In millions)	2019		2019
Finance lease cost:
Amortization of right of use assets	$	17	$	46
Interest on lease liabilities	12		32
Operating lease cost	209		597
Variable lease cost	23		66
Short-term lease cost	197		511
Total lease cost	$	458	$	1,252

Supplemental balance sheet data related to leases were as follows:

(In millions)	September 30, 2019
Operating leases
Assets
Right of use assets	$	2,522
Liabilities
Operating lease liabilities	$	586
Long-term operating lease liabilities	1,962
Total operating lease liabilities	$	2,548
Weighted average remaining lease term (in years)	6.4
Weighted average discount rate	4.09		%
Finance leases
Assets
Property, plant and equipment, gross	$	814
Accumulated depreciation	224
Property, plant and equipment, net	$	590
Liabilities
Debt due within one year	$	55
Long-term debt	654
Total finance lease liabilities	$	709
Weighted average remaining lease term (in years)	12.1
Weighted average discount rate	6.56		%

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As of September 30, 2019, maturities of lease liabilities for operating lease obligations and finance lease obligations having initial or remaining non-cancellable lease terms in excess of one year are as follows:

(In millions)	Operating		Finance
2019	$	174	$	29
2020	665		94
2021	572		86
2022	388		94
2023	277		96
2024 and thereafter	855		611
Gross lease payments	2,931		1,010
Less: imputed interest	383		301
Total lease liabilities	$	2,548	$	709

Presented in accordance with ASC 840, future minimum commitments as of December 31, 2018 for operating lease obligations and capital lease obligations having initial or remaining non-cancellable lease terms in excess of one year were as follows:

(In millions)	Operating		Capital
2019	$	709	$	70
2020	619		71
2021	553		66
2022	389		75
2023	295		82
2024 and thereafter	858		586
Total minimum lease payments	$	3,423	950
Less: imputed interest costs			301
Present value of net minimum lease payments			$	649

Lessor

MPLX has certain natural gas gathering, transportation and processing agreements in which it is considered to be the lessor under several implicit operating lease arrangements in accordance with GAAP. MPLX’s primary implicit lease operations relate to a natural gas gathering agreement in the Marcellus region for which it earns a fixed-fee for providing gathering services to a single producer using a dedicated gathering system. As the gathering system is expanded, the fixed-fee charged to the producer is adjusted to include the additional gathering assets in the lease. The primary term of the natural gas gathering arrangement expires in 2038 and will continue thereafter on a year-to-year basis until terminated by either party. Other implicit leases relate to a natural gas processing agreement in the Marcellus region and a natural gas processing agreement in the Southern Appalachia region for which MPLX earns minimum monthly fees for providing processing services to a single producer using a dedicated processing plant. The primary terms of these natural gas processing agreements expire during 2023 and 2033.

MPLX did not elect to use the practical expedient to combine lease and non-lease components for lessor arrangements. The tables below represent the portion of the contract allocated to the lease component based on relative standalone selling price. Lessor agreements are currently deemed operating, as we elected the practical expedient to grandfather in historical ASC 840 lease classifications. MPLX may be required to re-classify existing operating leases to sales-type leases upon modification and related reassessment of the leases.

Our revenue from implicit lease arrangements, excluding executory costs, totaled approximately $64 million and $195 million for the three and nine months ended September 30, 2019, respectively. The implicit lease arrangements related to the processing facilities contain contingent rental provisions whereby we receive additional fees if the producer customer exceeds the monthly minimum processed volumes. During the three and nine months ended September 30, 2019, MPLX did not receive any material contingent lease payments. The following is a schedule of minimum future rentals on the non‑cancellable operating leases as of September 30, 2019:

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(In millions)
2019	$	47
2020	186
2021	178
2022	176
2023	170
2024 and thereafter	1,269
Total minimum future rentals	$	2,026

The following schedule summarizes our investment in assets held for operating lease by major classes as of September 30, 2019:

(In millions)	September 30, 2019
Natural gas gathering and NGL transportation pipelines and facilities	$	1,061
Natural gas processing facilities	633
Terminal and related assets	82
Land, building, office equipment and other	45
Property, plant and equipment	1,821
Less accumulated depreciation	304
Property, plant and equipment, net	$	1,517

23. 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 September 30, 2019 and December 31, 2018, accrued liabilities for remediation totaled $447 million and $455 million, respectively. It is not presently possible to estimate the ultimate amount of all remediation costs that might be incurred or the penalties, if any, that may be imposed. Receivables for recoverable costs from certain states, under programs to assist companies in clean-up efforts related to underground storage tanks at presently or formerly owned or operated retail marketing sites, were $30 million and $35 million at September 30, 2019 and December 31, 2018, respectively.

Governmental and other entities in California, New York, Maryland and Rhode Island have filed lawsuits against coal, gas, oil and petroleum companies, including the Company. The lawsuits allege damages as a result of climate change and the plaintiffs are seeking unspecified damages and abatement under various tort theories. Similar lawsuits may be filed in other jurisdictions. At this early stage, the ultimate outcome of these matters remains uncertain, and neither the likelihood of an unfavorable outcome nor the ultimate liability, if any, can be determined.

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

Other Lawsuits

In May 2015, the Kentucky attorney general filed a lawsuit against our wholly-owned subsidiary, Marathon Petroleum Company LP (“MPC LP”), in the United States District Court for the Western District of Kentucky asserting claims under

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federal and state antitrust statutes, the Kentucky Consumer Protection Act, and state common law. The complaint, as amended in July 2015, alleges that MPC LP used deed restrictions, supply agreements with customers and exchange agreements with competitors to unreasonably restrain trade in areas within Kentucky and seeks declaratory relief, unspecified damages, civil penalties, restitution and disgorgement of profits. At this stage, the ultimate outcome of this litigation remains uncertain, and neither the likelihood of an unfavorable outcome nor the ultimate liability, if any, can be determined, and we are unable to estimate a reasonably possible loss (or range of loss) for this matter. We intend to vigorously defend ourselves in this matter.

In May 2007, the Kentucky attorney general filed a lawsuit against us and Marathon Oil in state court in Franklin County, Kentucky for alleged violations of Kentucky’s emergency pricing and consumer protection laws following Hurricanes Katrina and Rita in 2005. The lawsuit alleged that we overcharged customers by $89 million during September and October 2005. The complaint sought disgorgement of these sums, as well as penalties, under Kentucky’s emergency pricing and consumer protection laws. In May 2011, the Kentucky attorney general amended his complaint to include a request for immediate injunctive relief as well as unspecified damages and penalties related to our wholesale gasoline pricing in April and May 2011 under statewide price controls that were activated by the Kentucky governor on April 26, 2011 and which have since expired. The court denied the attorney general’s request for immediate injunctive relief. In July 2019, MPC and the attorney general reached a settlement to resolve this litigation. This resolution did not 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—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 vary but tend to follow the terms of the underlying debt, which extend through 2037. Our maximum potential undiscounted payments under these agreements for the debt principal totaled $171 million as of September 30, 2019.

In connection with our 25 percent interest in Gray Oak Pipeline, LLC (“Gray Oak Pipeline”), we have entered into an Equity Contribution Agreement obligating us to make certain equity contributions to Gray Oak Pipeline to support its obligations under a construction loan facility. Gray Oak Pipeline is constructing the Gray Oak oil pipeline, a crude oil transportation system from West Texas and the Eagle Ford formation to destinations in the Ingleside, Corpus Christi and Sweeney, Texas markets. Gray Oak Pipeline has entered into the construction loan facility with a syndicate of banks to finance a portion of the construction costs of the pipeline project.

The Equity Contribution Agreement requires us to contribute our pro rata share of any amounts necessary to allow Gray Oak Pipeline to cure any payment defaults under the construction loan facility or to repay all amounts outstanding under the facility, including principal, accrued interest, fees and expenses, in certain circumstances, including the abandonment of the Gray Oak pipeline project prior to completion or the failure of Gray Oak Pipeline to repay or refinance the construction loan facility prior to its scheduled maturity date of June 3, 2022. Gray Oak may borrow up to $1.43 billion under the construction loan facility (after giving effect to the exercise of all options to increase its borrowing capacity). As of September 30, 2019, our maximum potential undiscounted payments under the Equity Contribution Agreement for the debt principal totaled $226 million.

In connection with MPLX’s approximate nine percent indirect interest in a joint venture that owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects, collectively referred to as the Bakken Pipeline system, MPLX has entered into a Contingent Equity Contribution Agreement. MPLX, along with the other joint venture owners in the Bakken Pipeline system, have 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. As of September 30, 2019, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement was approximately $230 million.

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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 September 30, 2019, our maximum potential undiscounted payments under this agreement for debt principal totaled $125 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 September 30, 2019, our maximum potential undiscounted payments under this arrangement was $122 million.

Marathon Oil indemnifications—In conjunction with our spinoff from Marathon Oil, we have entered into arrangements with Marathon Oil providing indemnities and guarantees with recorded values of $1 million as of September 30, 2019, which consist of unrecognized tax benefits related to MPC, its consolidated subsidiaries and the refining, marketing and transportation business operations prior to our spinoff which are not already reflected in the unrecognized tax benefits described in Note 11, and other contingent liabilities Marathon Oil may incur related to taxes. Furthermore, the separation and distribution agreement and other agreements with Marathon Oil to effect our spinoff provide for cross-indemnities between Marathon Oil and us. In general, Marathon Oil is required to indemnify us for any liabilities relating to Marathon Oil’s historical oil and gas exploration and production operations, oil sands mining operations and integrated gas operations, and we are required to indemnify Marathon Oil for any liabilities relating to Marathon Oil’s historical refining, marketing and transportation operations. The terms of these indemnifications are indefinite and the amounts are not capped.

Other guarantees—We have entered into other guarantees with maximum potential undiscounted payments totaling $122 million as of September 30, 2019, 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.

General guarantees associated with dispositions—Over the years, we have sold various assets in the normal course of our business. Certain of the related agreements contain performance and general guarantees, including guarantees regarding inaccuracies in representations, warranties, covenants and agreements, and environmental and general indemnifications that require us to perform upon the occurrence of a triggering event or condition. These guarantees and indemnifications are part of the normal course of selling assets. We are typically not able to calculate the maximum potential amount of future payments that could be made under such contractual provisions because of the variability inherent in the guarantees and indemnities. Most often, the nature of the guarantees and indemnities is such that there is no appropriate method for quantifying the exposure because the underlying triggering event has little or no past experience upon which a reasonable prediction of the outcome can be based.

Contractual Commitments and Contingencies

At September 30, 2019, our contractual commitments to acquire property, plant and equipment and advance funds to equity method investees totaled $1.55 billion.

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.

24. SUBSEQUENT EVENT

On October 31, 2019, we announced plans to separate our retail transportation fuel and convenience store business, which is operated primarily under the Speedway brand, into an independent, publicly traded company. The transaction is intended to take the form of a tax-free distribution to MPC shareholders of publicly traded stock in the new independent retail transportation fuel and convenience store company. The transaction is expected to be completed by year-end 2020, subject to market, regulatory and certain other conditions, including final approval by the MPC Board of Directors, receipt of customary assurances regarding the intended tax-free nature of the transaction, and the effectiveness of a registration statement to be filed with the SEC. The Speedway business is currently a reporting unit within our Retail segment. Subsequent to the completion of the separation, the historical results of the Speedway business will be presented as discontinued operations in our consolidated financial statements.

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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, 2018.

All statements in this section, other than statements of historical fact, are forward-looking statements that are inherently uncertain. You can identify our forward-looking statements by words such as “anticipate,” “believe,” “could,” “design,” “estimate,” “expect,” “forecast,” “goal,” “guidance,” “imply,” “intend,” “may,” “objective,” “opportunity,” “outlook,” “plan,” “position,” “potential,” “predict,” “project,” “prospective,” “pursue,” “seek,” “should,” “strategy,” “target,” “will,” “would” or other similar expressions that convey the uncertainty of future events or outcomes. In accordance with “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, these statements are accompanied by cautionary language identifying important factors, though not necessarily all such factors, that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements include, but are not limited to, statements that relate to, or statements that are subject to risks, contingencies or uncertainties that relate to:

• the risk that the cost savings and any other synergies from the Andeavor acquisition may not be fully realized or may take longer to realize than expected;

• disruption from the Andeavor acquisition making it more difficult to maintain relationships with customers, employees or suppliers;

• risks relating to any unforeseen liabilities of Andeavor;

• the transaction between MPLX LP and Andeavor Logistics LP, including the risk that anticipated opportunities and any other synergies from or anticipated benefits of the transaction may not be fully realized or may take longer to realize than expected, including whether the transaction will be accretive within the expected timeframe or at all, or disruption from the transaction making it more difficult to maintain relationships with customers, employees or suppliers;

• with respect to the planned separation of our retail transportation fuel and convenience store business, which is operated primarily under the Speedway brand, the ability to successfully complete the separation within the expected timeframe or at all, based on numerous factors including the macroeconomic environment, credit markets and equity markets, our ability to satisfy customary conditions, and our ability to achieve our strategic and other objectives;

• with respect to the Midstream review, our ability to achieve the strategic and other objectives related to the strategic review;

• the ability to complete any divestitures on commercially reasonable terms and/or within the expected timeframe;

• future levels of revenues, refining and marketing margins, operating costs, retail gasoline and distillate margins, merchandise margins, income from operations, net income or earnings per share;

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

• consumer demand for refined products;

• our ability to manage disruptions in credit markets or changes to our credit rating;

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

• the success or timing of completion of ongoing or anticipated capital or maintenance projects;

• the reliability of processing units and other equipment;

• business strategies, growth opportunities and expected investments;

• share repurchase authorizations, including the timing and amounts of any common stock repurchases;

• the adequacy of our capital resources and liquidity, including but not limited to, availability of sufficient cash flow to execute our business plan and to effect any share repurchases or dividend increases, including within the expected timeframe;

• the effect of restructuring or reorganization of business components;

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

• continued or further volatility in and/or degradation of general economic, market, industry or business conditions;

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• compliance with federal and state environmental, economic, health and safety, energy and other policies and regulations, including the cost of compliance with the Renewable Fuel Standard, and/or enforcement actions initiated thereunder; and

• the anticipated effects of actions of third parties such as competitors, activist investors or 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:

• volatility or degradation in general economic, market, industry or business conditions;

• availability and pricing of domestic and foreign supplies of natural gas, NGLs and crude oil and other feedstocks;

• the ability of the members of the OPEC to agree on and to influence crude oil price and production controls;

• availability and pricing of domestic and foreign supplies of refined products such as gasoline, diesel fuel, jet fuel, home heating oil and petrochemicals;

• foreign imports and exports of crude oil, refined products, natural gas and NGLs;

• 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;

• 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;

• changes to our capital budget, expected construction costs and timing of projects;

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

• fluctuations in consumer demand for refined products, natural gas and NGLs, including seasonal fluctuations;

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

• actions taken by our competitors, including pricing adjustments, expansion of retail activities, 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;

• failure to realize the benefits projected for capital projects, or cost overruns associated with such projects;

• modifications to MPLX earnings and distribution growth objectives;

• the ability to successfully implement growth opportunities, including strategic initiatives and actions;

• risks and uncertainties associated with intangible assets, including any future goodwill or intangible assets impairment charges;

• the ability to realize the strategic benefits of joint venture opportunities;

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

• unusual weather conditions and natural disasters, which can unforeseeably affect the price or availability of crude oil and other feedstocks and refined products;

• 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;

• state and federal environmental, economic, health and safety, energy and other policies and regulations, including the cost of compliance with the renewable fuel standard program;

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

• rulings, judgments or settlements and related expenses in litigation or other legal, tax or regulatory matters, including unexpected environmental remediation costs, in excess of any reserves or insurance coverage;

• political pressure and influence of environmental groups 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 maintenance of satisfactory relationships with labor unions and joint venture partners;

• the ability and willingness of parties with whom we have material relationships to perform their obligations to us;

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• the market price of our common stock and its impact on our share repurchase authorizations;

• changes in the credit ratings assigned to our debt securities and trade credit, changes in the availability of unsecured credit, changes affecting the credit markets generally and our ability to manage such changes;

• capital market conditions and our ability to raise adequate capital to execute our business plan;

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

• the other factors described in Item 1A. Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2018.

We undertake no obligation to update any forward-looking statements except to the extent required by applicable law.

CORPORATE OVERVIEW

We are a leading, integrated, downstream energy company. We own and operate the nation’s largest refining system with more than 3 million barrels per calendar day of crude oil capacity across 16 refineries, located in the Gulf Coast, Mid-Continent and West Coast regions of the United States. Our refineries supply refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market, to consumers through our Retail business segment and to independent entrepreneurs who operate branded outlets. We believe we are one of the largest wholesale suppliers of gasoline and distillates to resellers in the United States.

We have three strong brands: Marathon^®, Speedway^® and ARCO^®. Approximately 6,800 branded outlets, primarily carrying the Marathon brand name, are operated by independent entrepreneurs in 35 states, the District of Columbia and Mexico. We believe our Retail segment operates the second largest chain of company-owned and operated retail transportation fuel and convenience stores in the United States, with approximately 3,930 convenience stores. Our Retail segment also sells transportation fuel to consumers through approximately 1,070 direct dealer locations. Our company-owned and operated locations primarily carry the Speedway^® brand name and the direct dealer locations carry primarily the ARCO^® brand name.

We are one of the largest midstream operators in North America. We primarily conduct our midstream operations through our ownership interest in MPLX, which owns and operates crude oil and light product transportation and logistics infrastructure as well as natural gas and NGL gathering, processing, and fractionation assets. As of September 30, 2019, we owned, leased or had ownership interests in approximately 16,600 miles of crude oil and refined product pipelines to deliver crude oil to our refineries and other locations and refined products to wholesale and retail market areas. We distribute our refined products through one of the largest terminal operations in the United States and one of the largest private domestic fleets of inland petroleum product barges. Our integrated midstream gathering and processing network links producers of natural gas and NGLs from some of the largest supply basins in the United States to domestic and international markets. Our midstream gathering and processing operations include: natural gas gathering, processing and transportation; and NGL gathering, transportation, fractionation, storage and marketing.

At September 30, 2019, our operations consisted of three reportable segments: Refining & Marketing; Retail; 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 16 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, to our Retail business segment and to independent entrepreneurs who operate primarily Marathon^® branded outlets.

• Retail – sells transportation fuels and convenience products in the retail market across the United States through company-owned and operated convenience stores, primarily under the Speedway^® brand, and long-term fuel supply contracts with direct dealers who operate locations primarily 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.

Recent Developments

On October 31, 2019, we announced our intention to separate our retail transportation fuel and convenience store business, which is operated primarily under the Speedway brand, into an independent, publicly traded company. The transaction is intended to take the form of a tax-free distribution to MPC shareholders of publicly traded stock in the new independent retail transportation fuel and convenience store company. The transaction is expected to be completed by year-end 2020, subject to

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market, regulatory and certain other conditions, including final approval by the MPC Board of Directors, receipt of customary assurances regarding the intended tax-free nature of the transaction, and the effectiveness of a registration statement to be filed with the SEC. The Speedway business is currently a reporting unit within our Retail segment. MPC will retain its direct-dealer business, which is also included in the Retail segment as currently reported.

MPC’s board of directors has also formed a special committee to enhance its evaluation of potential value-creating options for our Midstream business. Among other aspects, the special Board committee will analyze the strategic fit of assets with MPC, the ability to realize full valuation credit for midstream earnings and cash flow, balance sheet impacts including liquidity and credit ratings, transaction tax impacts, separation costs, and overall complexity.

As described in Notes 4 and 5 to the unaudited consolidated financial statements, we have consolidated ANDX since October 1, 2018 in accordance with ASC 810 and previously recorded ANDX’s assets and liabilities to our balance sheet at preliminary fair values as of the Andeavor acquisition date of October 1, 2018.

On July 30, 2019, MPLX completed its acquisition of ANDX, and ANDX survived as a wholly-owned subsidiary of MPLX. At the effective time of the ANDX acquisition, each common unit held by ANDX’s public unitholders was converted into the right to receive 1.135 MPLX common units. Additionally, as a result of MPLX’s acquisition of ANDX, 600,000 ANDX preferred units were converted into 600,000 preferred units of MPLX (the “Series B preferred units”). Series B preferred unitholders are entitled to receive, when and if declared by the board, a fixed distribution of $68.75 per unit, per annum, payable semi-annually in arrears on February 15 and August 15, or the first business day thereafter.

The transaction simplifies MPLX and ANDX into a single listed entity to create a leading, large-scale, diversified midstream company anchored by fee-based cash flows. The combined entity will have an expanded geographic footprint that is expected to enhance its long-term growth opportunities and the sustainable cash flow profile of the business.

EXECUTIVE SUMMARY

Results

Select results are reflected in the following table. Our results include the results of Andeavor from the October 1, 2018 acquisition date forward.

	Three Months Ended  September 30,						Nine Months Ended  September 30,
(In millions, except per share data)	2019			2018			2019			2018
Income from operations by segment
Refining & Marketing	$	883		$	666		$	1,455		$	1,558
Retail	442			161			1,105			415
Midstream	919			679			2,705			1,863
Items not allocated to segments	(220		)	(103		)	(530		)	(282		)
Income from operations	$	2,024		$	1,403		$	4,735		$	3,554
Net income attributable to MPC	$	1,095		$	737		$	2,194		$	1,829
Net income attributable to MPC per diluted share	$	1.66		$	1.62		$	3.28		$	3.92

Net income attributable to MPC was $1.10 billion, or $1.66 per diluted share, in the third quarter of 2019 compared to $737 million, or $1.62 per diluted share, for the third quarter of 2018. Net income attributable to MPC was $2.19 billion, or $3.28 per diluted share, in the first nine months of 2019 compared to $1.83 billion, or $3.92 per diluted share, for the first nine months of 2018. In both periods of 2019, primarily as a result of the Andeavor acquisition, increased income from operations was partially offset by increased net interest and other financial costs, provision for income taxes and net income attributable to noncontrolling interests.

Refer to the Results of Operations section for a discussion of consolidated financial results and segment results for the third quarter of 2019 as compared to the third quarter of 2018 and the first nine months of 2019 as compared to the first nine months of 2018.

Andeavor Acquisition

On October 1, 2018, we completed the Andeavor acquisition. Andeavor stockholders received in the aggregate approximately 239.8 million shares of MPC common stock valued at $19.8 billion and approximately $3.5 billion in cash in connection with the Andeavor acquisition.

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Andeavor was a highly integrated marketing, logistics and refining company operating primarily in the Western and Mid-Continent United States. Andeavor’s operations included procuring crude oil from its source or from other third parties, transporting the crude oil to one of its 10 refineries, and producing, marketing and distributing refined products. Its marketing system included more than 3,300 stations marketed under multiple well-known fuel brands including ARCO^®. Also, we acquired the general partner and 156 million common units of ANDX, which was formed to own, operate, develop and acquire logistics assets. Its assets are integral to the success of our refining and marketing operations and are used to gather crude oil, natural gas, and water, process natural gas and distribute, transport and store crude oil and refined products. On July 30, 2019, MPLX completed its acquisition of ANDX.

This transaction combined two strong, complementary companies to create a leading nationwide U.S. downstream energy company. The acquisition substantially increased our geographic diversification and scale and strengthened each of our operating segments by diversifying our refining portfolio into attractive markets and increasing access to advantaged feedstocks, enhancing our midstream footprint in the Permian Basin, and creating a nationwide retail and marketing portfolio all of which is expected to substantially improve efficiencies and our ability to serve customers. We expect the combination to generate up to approximately $1.4 billion in gross run-rate synergies within the first three years, significantly enhancing our long-term cash flow generation profile.

MPLX

We owned approximately 666 million MPLX common units at September 30, 2019 with a market value of $18.65 billion based on the September 30, 2019 closing price of $28.01 per common unit. On October 25, 2019, MPLX declared a quarterly cash distribution of $0.6775 per common unit payable on November 14, 2019. As a result, MPLX will make distributions totaling $704 million to its common unitholders. MPC’s portion of these distributions is approximately $438 million.

We received MPLX limited partner distributions of $1.39 billion and $775 million in the nine months ended September 30, 2019 and 2018, respectively. These distributions include MPLX distributions received in the nine months ended September 30, 2019 and 2018 and ANDX distributions received in the nine months ended September 30, 2019.

See Note 3 to the unaudited consolidated financial statements for additional information on MPLX.

Share Repurchases

During the nine months ended September 30, 2019, we returned $1.89 billion to our shareholders through repurchases of approximately 33 million shares of common stock at an average price per share of $58.75.

Since January 1, 2012, our board of directors has approved $18.0 billion in total share repurchase authorizations and we have repurchased a total of $14.98 billion of our common stock, leaving $3.02 billion available for repurchases as of September 30, 2019. See Note 8 to the unaudited consolidated financial statements.

Liquidity

As of September 30, 2019, we had cash and cash equivalents of approximately $1.48 billion, excluding MPLX cash and cash equivalents of $41 million, no borrowings and $1 million in letters of credit outstanding under our $6.0 billion bank revolving credit facilities and no borrowings outstanding under our $750 million trade receivables facility, resulting in cash and available liquidity of $8.23 billion. As of September 30, 2019, MPLX had approximately $3.50 billion available through its bank revolving credit agreement and $1.38 billion available through its intercompany credit facility with MPC.

Upon the completion of the merger of MPLX and ANDX on July 30, 2019, the MPLX bank revolving credit facility was amended and restated to increase the borrowing capacity to $3.5 billion and to extend the maturity date to July 30, 2024. The ANDX revolving and dropdown credit facilities were terminated and all outstanding balances were repaid and funded with the new $3.5 billion bank revolving credit facility.

On July 31, 2019, in connection with the closing of the ANDX merger, we amended and restated the existing intercompany loan agreement with MPLX to, among other things, increase MPLX’s borrowing capacity thereunder from $1.0 billion to $1.5 billion in loans at any one time outstanding and to extend the term of the intercompany loan agreement to July 31, 2024.

On July 26, 2019, we entered into a new $1 billion 364-day revolving credit facility with a syndicate of banks that became effective upon the expiration of our existing $1 billion 364-day revolving facility in September 2019. The new 364-day revolving credit facility contains substantially the same terms and conditions as our existing 364-day revolving credit facility and will expire in September 2020. 

On July 19, 2019, we amended our $750 million trade receivables securitization facility to extend the maturity date to July 16, 2021.

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OVERVIEW OF SEGMENTS

Refining & Marketing

Refining & Marketing segment income from operations depends largely on our Refining & Marketing margin 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 3-2-1 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 LLS crude producing two barrels of USGC CBOB gasoline and one barrel of USGC ULSD;

• 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 these crack spreads. The amount of these discounts, the sweet and sour differentials, can vary significantly, causing our Refining & Marketing margin to differ from 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.

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)	$	900
Sour differential sensitivity(b) (per $1.00/barrel change)	450
Sweet differential sensitivity(c) (per $1.00/barrel change)	370
Natural gas price sensitivity(d) (per $1.00/MMBtu)	300

^(a)  Crack spread based on 38 percent LLS, 38 percent WTI and 24 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

^(c)  Sweet crude oil basket consists of the following crudes: Bakken, Brent, LLS, WTI-Cushing and WTI-Midland

^(d)  This is consumption based exposure for our Refining & Marketing segment and does not include the effects to 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 and the mix of refined products as compared to the assumptions used to calculate the market crack spreads;

• the types of crude oil and other charge and blendstocks processed as compared to the assumptions used to calculate the market crack spreads;

• our refinery yields;

• the cost of products purchased for resale;

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

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

Inventories are stated at the lower of cost or market. Costs of crude oil, refinery feedstocks and refined products are stated under the LIFO inventory costing method and aggregated on a consolidated basis for purposes of assessing if the cost basis of these inventories may have to be written down to market values.

Refining & Marketing segment income from operations is also affected by changes in refinery direct operating costs, which include turnaround and major maintenance, depreciation and amortization and other manufacturing expenses. Changes in

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manufacturing costs are primarily driven by the cost of energy used by our refineries, including purchased natural gas, and the level of maintenance costs. Planned major maintenance activities, or turnarounds, requiring temporary shutdown of certain refinery operating units, are periodically performed at each refinery. Costs for planned turnaround, major maintenance and engineering projects are expensed in the period incurred.

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.

Retail

Retail segment profitability is impacted by fuel and merchandise margin. Fuel margin for gasoline and distillate is the price paid by consumers or direct dealers less the cost of refined products, including transportation, consumer excise taxes and bankcard processing fees (where applicable). Gasoline and distillate prices are volatile and are impacted by changes in supply and demand in the regions where we operate. Numerous factors impact gasoline and distillate demand throughout the year, including local competition, seasonal demand fluctuations, the available wholesale supply, the level of economic activity in our marketing areas and weather conditions.

The margin on merchandise sold at our convenience stores historically has been less volatile and has contributed substantially to our Retail segment margin. Our Retail convenience stores offer a wide variety of merchandise, including prepared foods, beverages and non-food items.

Inventories are carried at the lower of cost or market value. Costs of refined products and merchandise are stated under the LIFO inventory costing method and aggregated on a consolidated basis for purposes of assessing if the cost basis of these inventories may have to be written down to market values.

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 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 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. Our results include the results of Andeavor from the October 1, 2018 acquisition date forward. 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  September 30,							Nine Months Ended  September 30,
(In millions)	2019		2018		Variance			2019		2018		Variance
Revenues and other income:
Sales and other operating revenues	$	31,043	$	22,988	$	8,055		$	92,857	$	64,171	$	28,686
Income from equity method investments	124		96		28			330		262		68
Net gain on disposal of assets	4		1		3			222		6		216
Other income	31		47		(16		)	96		122		(26		)
Total revenues and other income	31,202		23,132		8,070			93,505		64,561		28,944
Costs and expenses:
Cost of revenues (excludes items below)	27,300		20,606		6,694			82,942		57,772		25,170
Depreciation and amortization	855		555		300			2,660		1,616		1,044
Selling, general and administrative expenses	833		445		388			2,618		1,271		1,347
Other taxes	190		123		67			550		348		202
Total costs and expenses	29,178		21,729		7,449			88,770		61,007		27,763
Income from operations	2,024		1,403		621			4,735		3,554		1,181
Net interest and other financial costs	317		240		77			945		618		327
Income before income taxes	1,707		1,163		544			3,790		2,936		854
Provision for income taxes	340		222		118			797		525		272
Net income	1,367		941		426			2,993		2,411		582
Less net income attributable to:
Redeemable noncontrolling interest	20		19		1			61		55		6
Noncontrolling interests	252		185		67			738		527		211
Net income attributable to MPC	$	1,095	$	737	$	358		$	2,194	$	1,829	$	365

Third Quarter 2019 Compared to Third Quarter 2018

Net income attributable to MPC increased $358 million in the third quarter of 2019 compared to the third quarter of 2018 primarily due to an increase in income from operations, partially offset by increases in the provision for income taxes, net interest and other financial costs and net income attributable to noncontrolling interests.

Revenues and other income increased $8.07 billion. Sales and other operating revenues increased $8.06 billion primarily due to increased Refining & Marketing segment refined product sales volumes, which increased 1,324 mbpd, largely due to the Andeavor acquisition on October 1, 2018.

Costs and expenses increased $7.45 billion primarily due to:

• increased cost of revenues of $6.69 billion mainly due to the inclusion of costs related to the Andeavor operations following the acquisition;

• increased depreciation and amortization of $300 million primarily due to the depreciation of the fair value of assets acquired in connection with the Andeavor acquisition;

• increased selling, general and administrative expenses of $388 million largely due to the inclusion of costs related to Andeavor operations and reflecting MPC’s classification of costs and expenses; and

• increased other taxes of $67 million primarily due to the inclusion of other taxes related to the acquired Andeavor operations.

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Net interest and other financial costs increased $77 million mainly due to debt assumed in the acquisition of Andeavor and increased MPLX borrowings, partially offset by a decrease in pension settlement losses of $38 million.

Provision for income taxes increased $118 million primarily due to increased income before income taxes of $544 million. The combined federal, state and foreign income tax rate was 20 percent and 19 percent for the three months ended September 30, 2019 and 2018, respectively. The effective tax rate for the three months ended September 30, 2019 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interests offset by equity compensation and state and local tax expense. The effective tax rate for the three months ended September 30, 2018 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interests offset by state and local tax expense.

Net income attributable to noncontrolling interests increased $67 million primarily due to net income attributable to noncontrolling interest in ANDX, which was acquired by MPLX on July 30, 2019.

Nine Months Ended September 30, 2019 Compared to Nine Months Ended September 30, 2018

Net income attributable to MPC increased $365 million in the first nine months of 2019 compared to the first nine months of 2018 primarily due to an increase in income from operations, partially offset by increases in net interest and other financial costs, provision for income taxes and net income attributable to noncontrolling interests.

Revenues and other income increased $28.94 billion primarily due to:

• increased sales and other operating revenues of $28.69 billion primarily due to increased Refining & Marketing segment refined product sales volumes, which increased 1,384 mbpd, largely due to the Andeavor acquisition on October 1, 2018;

• increased income from equity method investments of $68 million largely due to income from midstream affiliates; and

• increased net gain on disposal of assets of $216 million mainly due to a $207 million gain recognized in connection with MPC’s exchange of its undivided interest in the Capline pipeline system for an equity ownership in Capline LLC.

Costs and expenses increased $27.76 billion primarily due to:

• increased cost of revenues of $25.17 billion primarily due to the inclusion of costs related to the Andeavor operations following the acquisition;

• increased depreciation and amortization of $1.04 billion largely due to the depreciation of the fair value of assets acquired in connection with the Andeavor acquisition;

• increased selling, general and administrative expenses of $1.35 billion mainly due to the inclusion of costs related to Andeavor operations and reflecting MPC’s classification of costs and expenses; and

• increased other taxes of $202 million primarily due to the inclusion of other taxes related to the acquired Andeavor operations.

Net interest and other financial costs increased $327 million largely due to debt assumed in the acquisition of Andeavor and increased MPLX borrowings, partially offset by a decrease in pension settlement losses of $38 million.

Provision for income taxes increased $272 million primarily due to increased income before income taxes of $854 million and $36 million of state deferred tax expense recorded as an out of period adjustment related to the Andeavor acquisition. The combined federal, state and foreign income tax rate was 21 percent and 18 percent for the nine months ended September 30, 2019 and 2018, respectively. The effective tax rate for the nine months ended September 30, 2019 was equal to the U.S. statutory rate of 21 percent primarily due to $36 million of state deferred tax expense recorded as an out of period adjustment, offset by permanent tax differences related to net income attributable to noncontrolling interests. The effective tax rate for the nine months ended September 30, 2018 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interests offset by state and local tax expense.

Net income attributable to noncontrolling interests increased $211 million primarily due to net income attributable to noncontrolling interest in ANDX, which was acquired by MPLX on July 30, 2019.

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Segment Results

Our segment income from operations was approximately $5.27 billion and $3.84 billion for the nine months ended September 30, 2019 and 2018, respectively. The following shows the percentage of segment income from operations by segment for these periods.

Refining & Marketing

The following includes key financial and operating data for the third quarter of 2019 compared to the third quarter of 2018 and the nine months ended September 30, 2019 compared to the nine months ended September 30, 2018. Our results include the results of Andeavor from the October 1, 2018 acquisition date forward.

We revised our Refining & Marketing segment supplemental reporting in the second quarter as shown in the table on page 44. Costs formerly included in Refining & Marketing’s direct operating costs category are now presented in three categories: refining operating costs, refining planned turnaround costs and depreciation and amortization. We also present distribution costs, formerly referred to as other operating expenses, which are primarily related to transportation and marketing of refined products, including fees paid to MPLX.

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^(a)  Includes intersegment sales and sales destined for export.

	Three Months Ended  September 30,						Nine Months Ended  September 30,
	2019			2018			2019			2018
Refining & Marketing Operating Statistics
Total refinery throughputs (mbpd)	3,156			2,032			3,125			1,992
Refining & Marketing margin per barrel(a)(b)	$	14.66		$	14.25		$	13.72		$	13.48
Less:
Refining operating costs per barrel(c)	5.44			4.25			5.45			4.55
Distribution costs per barrel(d)	4.31			4.17			4.48			4.02
Other per barrel(e)	(0.05		)	(0.17		)	(0.05		)	(0.15		)
Refining planned turnaround costs per barrel	0.56			1.06			0.69			0.80
Depreciation and amortization per barrel	1.45			1.38			1.46			1.40
Purchase accounting-depreciation and amortization(f)	(0.09		)	—			(0.01		)	—
Refining & Marketing segment income per barrel	$	3.04		$	3.56		$	1.70		$	2.86

^(a)  Sales revenue less cost of refinery inputs and purchased products, divided by total refinery throughputs.

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

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

^(d)  Includes fees paid to MPLX. On a per barrel throughput basis, these fees were $2.74 and $3.22 for the three months ended September 30, 2019 and 2018, respectively, and $2.79 and $3.08 for the nine months ended September 30, 2019 and 2018, respectively. Excludes depreciation and amortization expense.

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

^(f)  Reflects the cumulative effects through June 30, 2019 related to a measurement period adjustment arising from the finalization of purchase accounting.

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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. Following the acquisition of Andeavor in October 2018, we expanded the benchmark prices included in these tables to include market information for the West Coast region of the United States, including LA CARBOB and LA CARB diesel spot prices, ANS crude prices and a West Coast ANS 3-2-1 crack spread. However, since the results of the Andeavor businesses are only included in our results from October 1, 2018 forward, these market indicators did not affect our results for the third quarter and first nine months of 2018. 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  September 30,						Nine Months Ended  September 30,
Benchmark Spot Prices (dollars per gallon)	2019			2018			2019			2018
Chicago CBOB unleaded regular gasoline	$	1.73		$	2.06		$	1.73		$	1.94
Chicago ULSD	1.79			2.20			1.86			2.09
USGC CBOB unleaded regular gasoline	1.65			1.98			1.65			1.90
USGC ULSD	1.83			2.14			1.88			2.06
LA CARBOB	1.97			2.14			1.99			2.11
LA CARB diesel	1.94			2.22			2.00			2.15
Market Indicators (dollars per barrel)
LLS	$	60.59		$	74.14		$	63.37		$	71.06
WTI	56.44			69.43			57.10			66.79
ANS	63.02			75.42			65.27			72.25
Crack Spreads:
Mid-Continent WTI 3-2-1	$	15.26		$	17.79		$	15.85		14.87
USGC LLS 3-2-1	10.05			9.84			8.12			9.15
West Coast ANS 3-2-1	17.77			14.07			17.21			15.00
Blended 3-2-1(a)	13.88			13.88			13.24			11.44
Crude Oil Differentials:
Sweet	$	(1.31	)	$	(3.26	)	$	(2.40	)	$	(2.36	)
Sour	(2.35		)	(7.65		)	(2.50		)	(6.87		)

^(a)  Blended 3-2-1 Mid-Continent/USGC/West Coast crack spread is 38/38/24 percent in 2019 and Blended 3-2-1 Mid-Continent/USGC crack spread is 40/60 percent in 2018, which reflects MPC’s capacity prior to the Andeavor acquisition. These blends are based on our refining capacity by region in each period.

Third Quarter 2019 Compared to Third Quarter 2018

Refining & Marketing segment revenues increased $6.86 billion primarily due to higher refined product sales volumes, which increased 1,324 mbpd mainly due to the Andeavor acquisition on October 1, 2018, partially offset by decreased average refined product sales prices of $0.23 per gallon.

Refinery crude oil capacity utilization was 98 percent during the third quarter of 2019 and total refinery throughputs increased 1,124 mbpd primarily due to the refineries acquired from Andeavor.

Refining & Marketing segment income from operations increased $217 million primarily driven by higher Refining & Marketing margin, which was partially offset by higher operating and distribution costs as well as higher depreciation and amortization. The increases in Refining & Marketing margin and costs and expenses were primarily due to increased sales and production volumes following the Andeavor acquisition.

Refining & Marketing margin was $14.66 per barrel for the third quarter of 2019 compared to $14.25 per barrel for the third quarter of 2018. 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 $1.4 billion on Refining & Marketing margin for the third quarter of 2019 compared to the third quarter of 2018, primarily due to an approximate $1.9 billion benefit from increased throughput volume, mainly attributed to the Andeavor acquisition, partially offset by narrower crude oil differentials. Our reported Refining & Marketing margin differs from market indicators due to the mix of crudes purchased and their costs, the

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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 and other feedstock variances. These factors had an estimated net positive effect of $200 million on Refining & Marketing segment income in the third quarter of 2019 compared to the third quarter of 2018.

Refining operating costs, excluding depreciation and amortization, increased $1.19 per barrel and distribution costs, excluding depreciation and amortization, increased $0.14 per barrel primarily due to the inclusion of costs for the refining operations acquired from Andeavor. The per barrel cost increases, among other items, reflect the addition of Andeavor’s West Coast refineries, which generally have higher operating costs than the other regions in which we operate due to specific geographical location and regulatory factors. Distribution costs, excluding depreciation and amortization, include fees paid to MPLX of $794 million and $601 million for the third quarter of 2019 and 2018, respectively. Refining planned turnaround costs decreased $0.50 per barrel due to the timing of turnaround activity. Depreciation and amortization per barrel increased by $0.07, primarily due to intangible asset amortization related to the fair value of assets acquired from Andeavor as of October 1, 2018. During the period, we recorded a $0.09 per barrel adjustment to reduce depreciation and amortization which reflects the cumulative effects through June 30, 2019 related to a measurement period adjustment arising from the finalization of purchase accounting.

Nine Months Ended September 30, 2019 Compared to Nine Months Ended September 30, 2018

Refining & Marketing segment revenues increased $25.24 billion primarily due to higher refined product sales volumes, which increased 1,384 mbpd mainly due to the Andeavor acquisition on October 1, 2018, and decreased average refined product sales prices of $0.13 per gallon.

Refinery crude oil capacity utilization was 97 percent in the first nine months of 2019 and total refinery throughputs increased 1,133 mbpd primarily due to the refineries acquired from Andeavor.

Refining & Marketing segment income from operations decreased $103 million primarily driven by higher Refining & Marketing margin, more than offset by higher operating, distribution and depreciation and amortization costs. The increases in Refining & Marketing margin and costs and expenses are primarily due to increased sales and production volumes following the Andeavor acquisition.

Refining & Marketing margin was $13.72 per barrel for the first nine months of 2019 compared to $13.48 per barrel for the first nine months of 2018. 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 $4.9 billion on Refining & Marketing margin for the first nine months of 2019 compared to the first nine months of 2018, primarily due to an approximate $5.1 billion benefit from increased throughput volume, mainly attributed to the Andeavor acquisition, and wider sweet crude oil differentials, partially offset by narrower sour crude oil 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 and other feedstock variances. These factors had an estimated net negative effect of approximately $500 million on Refining & Marketing segment income in the first nine months of 2019 compared to the first nine months of 2018.

Refining operating costs, excluding depreciation and amortization, increased $0.90 per barrel and distribution costs, excluding depreciation and amortization, increased $0.46 per barrel primarily due to the inclusion of costs for the refining operations acquired from Andeavor. The per barrel cost increases, among other items, reflect the addition of Andeavor’s West Coast refineries, which generally have higher operating costs than the other regions in which we operate due to specific geographical location and regulatory factors. Distribution costs, excluding depreciation and amortization, include fees paid to MPLX of $2.38 billion and $1.68 billion for the for the first nine months of 2019 and 2018, respectively. The first nine months of 2019 also increased due to one additional month of fixed fee services provided by MPLX due to timing of dropdown transactions in 2018. Refining planned turnaround costs decreased $0.11 per barrel due to the timing of turnaround activity. Depreciation and amortization per barrel increased by $0.06, primarily due to the intangible asset amortization related to the fair value of assets acquired from Andeavor as of October 1, 2018. During the period, we recorded a $0.01 per barrel adjustment to reduce depreciation and amortization which reflects the cumulative effects through June 30, 2019 related to a measurement period adjustment arising from the finalization of purchase accounting.

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Supplemental Refining & Marketing Statistics

	Three Months Ended  September 30,		Nine Months Ended  September 30,
	2019	2018	2019	2018
Refining & Marketing Operating Statistics
Refined product export sales volumes (mbpd)(a)	379	280	407	289
Crude oil capacity utilization percent(b)	98	97	97	97
Refinery throughputs (mbpd):(c)
Crude oil refined	2,969	1,833	2,925	1,819
Other charge and blendstocks	187	199	200	173
Total	3,156	2,032	3,125	1,992
Sour crude oil throughput percent	47	52	49	53
Sweet crude oil throughput percent	53	48	51	47
Refined product yields (mbpd):(c)
Gasoline	1,553	942	1,538	942
Distillates	1,103	676	1,091	659
Propane	56	40	55	37
Feedstocks and petrochemicals	334	313	345	294
Heavy fuel oil	44	29	47	30
Asphalt	106	73	90	68
Total	3,196	2,073	3,166	2,030

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

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

^(c)  Excludes inter-refinery volumes which totaled 116 mbpd and 54 mbpd for the three months ended September 30, 2019 and 2018, respectively, and 98 mbpd and 53 mbpd for the nine months ended September 30, 2019 and 2018, respectively.

Retail

The following includes key financial and operating data for the third quarter of 2019 compared to the third quarter of 2018 and the nine months ended September 30, 2019 compared to the nine months ended September 30, 2018. Our results include the results of Andeavor from the October 1, 2018 acquisition date forward.

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^(a)  The price paid by consumers or direct dealers less the cost of refined products, including transportation, consumer excise taxes and bankcard processing fees (where applicable), divided by gasoline and distillate sales volume. Excludes LCM inventory valuation adjustments.

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

	Three Months Ended  September 30,						Nine Months Ended  September 30,
Key Financial and Operating Data	2019			2018			2019			2018
Average fuel sales prices (dollars per gallon)	$	2.66		$	2.80		$	2.64		$	2.71
Merchandise sales (in millions)	$	1,703		$	1,339		$	4,736		$	3,753
Merchandise margin (in millions)(a)(b)	$	498		$	384		$	1,376		$	1,069
Same store gasoline sales volume (period over period)(c)	(2.8		)%	(1.2		)%	(2.8		)%	(1.8		)%
Same store merchandise sales (period over period)(c)(d)	5.2		%	4.9		%	5.6		%	3.4		%
Convenience stores at period-end	3,931			2,745
Direct dealer locations at period-end	1,067			—

^(a)  The price paid by the consumers less the cost of merchandise.

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

^(c)  Same store comparison includes only locations owned at least 13 months.  

^(d)  Excludes cigarettes.

Third Quarter 2019 Compared to Third Quarter 2018

Retail segment revenues increased $3.28 billion primarily due to increased fuel and merchandise sales resulting from the Andeavor acquisition on October 1, 2018. The Andeavor acquisition added approximately 1,100 company-owned and operated locations along with long-term supply contracts for approximately 1,067 direct dealer locations. Increased fuel sales volumes of 1.17 billion gallons, almost all of which was related to the acquisition, were partially offset by decreased average fuel sales prices of $0.14 per gallon. Merchandise sales increased $364 million resulting from the contributions of the acquired businesses.

Retail segment income from operations increased $281 million largely related to the addition of the Andeavor retail operations as well as a $63 million year-over-year increase in MPC's legacy Speedway segment earnings driven by higher fuel and merchandise margins. These increases were partially offset by increases in operating expenses and depreciation primarily resulting from the locations acquired from Andeavor. The Retail fuel margin increased to 24.53 cents per gallon in the third quarter of 2019 compared with 16.51 cents per gallon in the third quarter of 2018 and the merchandise margin increased $114 million.

Nine Months Ended September 30, 2019 Compared to Nine Months Ended September 30, 2018

Retail segment revenues increased $9.77 billion primarily due to increased fuel and merchandise sales resulting from the Andeavor acquisition on October 1, 2018. Increased fuel sales volumes of 3.43 billion gallons, almost all of which was related

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to the acquisition, were partially offset by decreased average fuel sales prices of $0.07 per gallon. Merchandise sales increased $983 million resulting from the contributions of the acquired businesses.

Retail segment income from operations increased $690 million primarily due to higher light product and merchandise margins largely related to the addition of the Andeavor retail operations as well as a $146 million year-over-year increase in MPC's legacy Speedway segment earnings driven by higher fuel and merchandise margins. These increases were partially offset by increases in operating expenses and depreciation primarily resulting from the locations acquired from Andeavor. The Retail fuel margin increased to 22.86 cents per gallon in the first nine months of 2019 compared with 16.20 cents per gallon in the first nine months of 2018 and the merchandise margin increased $307 million.

Midstream

The following includes key financial and operating data for the third quarter of 2019 compared to the third quarter of 2018 and the nine months ended September 30, 2019 compared to the nine months ended September 30, 2018. Our results include the results of Andeavor from the October 1, 2018 acquisition date forward.

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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  September 30,				Nine Months Ended  September 30,
Benchmark Prices	2019		2018		2019		2018
Natural Gas NYMEX HH ($ per MMBtu)	$	2.33	$	2.86	$	2.57	$	2.85
C2 + NGL Pricing ($ per gallon)(a)	$	0.44	$	0.90	$	0.53	$	0.81

^(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.

Third Quarter 2019 Compared to Third Quarter 2018

Midstream segment revenue increased $535 million primarily due to the inclusion of ANDX revenues subsequent to the Andeavor acquisition on October 1, 2018. On July 30, 2019, MPLX completed its acquisition of ANDX.

Midstream segment income from operations increased $240 million largely due to contributions from ANDX.

Nine Months Ended September 30, 2019 Compared to Nine Months Ended September 30, 2018

On February 1, 2018, we completed the dropdown of refining logistics assets and fuels distribution services to MPLX, which is reported in our Midstream segment. These new businesses were reported in the Midstream segment prospectively from February 1, 2018.

Midstream segment revenue increased $2.02 billion primarily due to the inclusion of ANDX revenues subsequent to the Andeavor acquisition on October 1, 2018. On July 30, 2019, MPLX completed its acquisition of ANDX. In addition, the first nine months of 2019 reflects an extra month of fees charged for fuels distribution and refining logistics services provided to Refining & Marketing following the February 1, 2018 dropdown to MPLX.

Midstream segment income from operations increased $842 million largely due to contributions of $700 million from ANDX and an $142 million increase in Midstream segment results driven primarily by growth across MPLX’s businesses.

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Items not Allocated to Segments

Key Financial Information (in millions)	Three Months Ended  September 30,						Nine Months Ended  September 30,
	2019			2018			2019		2018
Items not allocated to segments:
Corporate and other unallocated items(a)	$	(198	)	$	(99	)	(568	)	(269	)
Capline restructuring gain	—			—			207		—
Transaction-related costs	(22		)	(4		)	(147	)	(14	)
Litigation	—			—			(22	)	—
Impairments	—			—			—		1

^(a)  Corporate and other unallocated items 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. Corporate overhead expenses are not allocated to the Refining & Marketing and Retail segments.

Third Quarter 2019 Compared to Third Quarter 2018

Corporate and other unallocated items increased $99 million largely due the inclusion of costs and expenses related to Andeavor operations.

Other unallocated items include transaction-related costs of $22 million associated with the Andeavor acquisition including employee retention, severance and other costs.

Nine Months Ended September 30, 2019 Compared to Nine Months Ended September 30, 2018

Corporate and other unallocated items increased $299 million largely due to the inclusion of costs and expenses related to Andeavor operations.

Other unallocated items include a $207 million gain resulting from the agreements executed with Capline LLC to contribute our 33 percent undivided interest in the Capline pipeline system in exchange for a 33 percent ownership interest in Capline LLC. Other unallocated items also include transaction-related costs of $147 million associated with the Andeavor acquisition and a litigation reserve adjustment of $22 million. The transaction-related costs recognized in the first nine months include the recognition of an obligation for vacation benefits provided to former Andeavor employees in the first quarter as well as employee retention, severance and other costs.

Non-GAAP Financial Measures

Management uses certain financial measures to evaluate our operating performance that are calculated and presented on the basis of methodologies other than in accordance with GAAP. We believe these non-GAAP financial measures are useful to investors and analysts to assess our ongoing financial performance because, when reconciled to their most comparable GAAP financial measures, they provide 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. These measures should not be considered a substitute for, or superior to, measures of financial performance prepared in accordance with GAAP, and our calculations thereof may not be comparable to similarly titled measures reported by other companies. The non-GAAP financial measures we use are as follows:

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Refining & Marketing Margin

Refining margin is defined as sales revenue less the cost of refinery inputs and purchased products and excludes any LCM inventory market adjustment.

	Three Months Ended  September 30,						Nine Months Ended  September 30,
Reconciliation of Refining & Marketing income from operations to Refining & Marketing margin (in millions)	2019			2018			2019			2018
Refining & Marketing income from operations	$	883		$	666		$	1,455		$	1,558
Plus (Less):
Refining operating costs(a)	1,577			795			4,656			2,480
Refining depreciation and amortization	328			241			1,083			712
Refining planned turnaround costs	164			197			587			432
Distribution costs(b)	1,251			780			3,818			2,183
Distribution depreciation and amortization	69			16			152			49
Income from equity method investments	(6		)	(7		)	(10		)	(14		)
Net gain on disposal of assets	—			(1		)	(6		)	(5		)
Other income	(8		)	(24		)	(30		)	(63		)
Refining & Marketing margin	$	4,258		$	2,663		$	11,705		$	7,332

^(a)  Includes refining major maintenance and operating costs. Excludes turnaround and depreciation and amortization expense.

^(b)  Includes fees paid to MPLX of $794 million and $601 million for the third quarter 2019 and 2018, respectively, and $2.38 billion and $1.68 billion for the nine months ended September 30, 2019 and 2018, respectively. Excludes depreciation and amortization expense.

Retail Fuel Margin

Retail fuel margin is defined as the price paid by consumers or direct dealers less the cost of refined products, including transportation, consumer excise taxes and bankcard processing fees (where applicable) and excluding any LCM inventory market adjustment.

Retail Merchandise Margin

Retail merchandise margin is defined as the price paid by consumers less the cost of merchandise.

	Three Months Ended  September 30,						Nine Months Ended  September 30,
Reconciliation of Retail income from operations to Retail total margin (in millions)	2019			2018			2019			2018
Retail income from operations	$	442		$	161		$	1,105		$	415
Plus (Less):
Operating, selling, general and administrative expenses	644			418			1,824			1,203
Depreciation and amortization	113			76			369			228
Income from equity method investments	(20		)	(18		)	(58		)	(51		)
Net gain on disposal of assets	(2		)	(1		)	(4		)	(1		)
Other income	(3		)	(2		)	(9		)	(5		)
Retail total margin	$	1,174		$	634		$	3,227		$	1,789
Retail total margin:
Fuel margin	$	649		$	243		$	1,772		$	699
Merchandise margin	498			384			1,376			1,069
Other margin	27			7			79			21
Retail total margin	$	1,174		$	634		$	3,227		$	1,789

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LIQUIDITY AND CAPITAL RESOURCES

Cash Flows

Our consolidated cash and cash equivalents balance was approximately $1.53 billion at September 30, 2019 compared to $1.69 billion at December 31, 2018. Net cash provided by (used in) operating activities, investing activities and financing activities are presented in the following table. Our cash flows reflect the results of the business acquired in connection with the Andeavor acquisition from October 1, 2018 forward.

	Nine Months Ended  September 30,
(In millions)	2019			2018
Net cash provided by (used in):
Operating activities	$	7,032		$	3,431
Investing activities	(4,575		)	(2,895		)
Financing activities	(2,654		)	1,444
Total increase (decrease) in cash	$	(197	)	$	1,980

Net cash provided by operating activities increased $3.60 billion in the first nine months of 2019 compared to the first nine months of 2018, primarily due to an increase in operating results and favorable changes in working capital of $1.29 billion. Changes in working capital exclude changes in short-term debt.

Changes in working capital, excluding changes in short-term debt, were a net $495 million source of cash in the first nine- months of 2019 compared to a net $797 million use of cash in the first nine months of 2018.

For the first nine months of 2019, changes in working capital, excluding changes in short-term debt, were a net $495 million source of cash primarily due to the effects of increasing energy commodity prices at the end of the period on working capital. Current receivables increased primarily due to higher refined product and crude prices and higher crude sales volumes. Accounts payable increased primarily due to increases in crude prices and crude volumes. Inventories decreased due to decreases in crude and refined product inventories, partially offset by an increase in materials and supplies inventory.

For the first nine months of 2018, changes in working capital, excluding changes in short-term debt, were a net $797 million use of cash primarily due to the effect of increases in energy commodity prices at the end of the period, partially offset by decreases in volumes, on working capital. Current receivables increased primarily due to higher refined product and crude prices. Accounts payable decreased primarily due to a decrease in crude purchases partially offset by an increase in crude prices. Inventories decreased due to decreases in crude and materials and supplies inventories, partially offset by an increase in refined products inventories.

Net cash used in investing activities increased $1.68 billion in the first nine months of 2019 compared to the first nine months of 2018, primarily due to the following:

• An increase in additions to property, plant and equipment of $1.51 billion primarily due to increased capital expenditures in the first nine months of 2019 in our Midstream and Refining & Marketing segments; and

• an increase in net investments of $511 million largely due to investments in connection with the construction of the Gray Oak Pipeline, which is scheduled to commence operations in the fourth quarter of 2019, the Wink to Webster Pipeline and the Whistler Pipeline.

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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.

	Nine Months Ended  September 30,
(In millions)	2019			2018
Additions to property, plant and equipment per the consolidated statements of cash flows	$	3,823		$	2,315
Asset retirement expenditures	1			7
Increase (decrease) in capital accruals	(300		)	67
Total capital expenditures	3,524			2,389
Investments in equity method investees (excludes acquisitions)	792			222
Total capital expenditures and investments	$	4,316		$	2,611

Financing activities were a net $2.65 billion use of cash in the first nine months of 2019 compared to a net $1.44 billion source of cash in the first nine months of 2018.

• Long-term debt borrowings and repayments, including debt issuance costs, were a net $1.20 billion source of cash in the first nine months of 2019 compared to a net $5.28 billion source of cash in the first nine months of 2018. During the first nine months of 2019, MPLX issued $2 billion of floating rate senior notes, the proceeds of which were used to repay various outstanding MPLX borrowings, and had net borrowings of $500 million under its term loan. During the first nine months of 2018, MPLX issued $5.5 billion of senior notes, we redeemed $600 million of our senior notes and MPLX repaid $505 million in outstanding borrowings under its revolving credit facility.

• Cash used in common stock repurchases decreased $727 million in the first nine months of 2019 compared to the first nine months of 2018. Share repurchases totaled $1.89 billion in the first nine months of 2019 compared to $2.61 billion in the first nine months of 2018. In 2018, share repurchases were funded primarily by after tax proceeds from the February 1, 2018 dropdown. See Note 8 to the unaudited consolidated financial statements for further discussion of share repurchases.

• Cash used in dividend payments increased $417 million in the first nine months of 2019 compared to the first nine months of 2018, primarily due to a net increase in the number of shares of our common stock outstanding related to the Andeavor acquisition and a $0.21 per share increase in our base dividend, partially offset by a reduction of shares resulting from share repurchases. Our dividend payments were $1.59 per common share in the first nine months of 2019 compared to $1.38 per common share in the first nine months of 2018.

• Cash used in distributions to noncontrolling interests increased $351 million in the first nine months of 2019 compared to the first nine months of 2018, primarily due to the addition of ANDX distributions subsequent to the acquisition of Andeavor and an increase in MPLX’s distribution per common unit. On July 30, 2019, MPLX completed its acquisition of ANDX.

• Contributions from noncontrolling interests increased $86 million in the first nine months of 2019 compared to the first nine months of 2018 primarily due to cash received in 2019 for an increased noncontrolling interest in an MPLX subsidiary.

Derivative Instruments

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

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Capital Resources

Our liquidity totaled $8.23 billion at September 30, 2019 consisting of:

	September 30, 2019
(In millions)	Total Capacity		Outstanding Borrowings		Available Capacity
Bank revolving credit facility(a)(b)	$	5,000	$	1	$	4,999
364-day bank revolving credit facility	1,000		—		$	1,000
Trade receivables facility	750		—		750
Total	$	6,750	$	1	$	6,749
Cash and cash equivalents(c)					1,484
Total liquidity					$	8,233

^(a)  Excludes MPLX’s $3.50 billion bank revolving credit facility, which had approximately $3.50 billion available as of September 30, 2019.

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

^(c)  Excludes MPLX cash and cash equivalents of $41 million.

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.

On September 26, 2019, MPLX entered into a term loan agreement with a syndicate of lenders providing for borrowings up to $1 billion available to be drawn in up to four separate borrowings. If not fully utilized, the term loan commitments expire 90 days after September 26, 2019. Borrowings under the term loan agreement bear interest, at MPLX’s election, at either the Adjusted LIBO Rate (as defined in the term loan agreement) plus a margin or the Alternate Base Rate (as defined in the term loan agreement) plus a margin. The applicable margin to the benchmark interest rates fluctuate from time-to-time based on our credit ratings. The proceeds from borrowings under the term loan agreement are to be used to fund the repayment of MPLX’s existing indebtedness and/or for general business purposes. The term loan agreement matures on September 26, 2021 and may be prepaid at any time without premium or penalty.

On September 9, 2019, MPLX issued $2 billion aggregate principal amount of floating rate senior notes in a public offering, consisting of $1 billion aggregate principal amount of notes due September 2021 and $1 billion aggregate principal amount of notes due September 2022. The proceeds were used to repay various outstanding MPLX borrowings and for general business purposes. Interest is payable quarterly in March, June, September and December, commencing on December 9, 2019. The interest rate applicable to the floating rate senior notes due September 2021 is LIBOR plus 0.9% while the interest rate applicable to the floating rate senior notes due September 2022 is LIBOR plus 1.1%.

In connection with the merger of MPLX and ANDX, MPLX assumed ANDX’s outstanding senior notes which had an aggregate principal amount of $3.75 billion, with interest rates ranging from 3.5% to 6.375% and maturity dates ranging from 2019 to 2047. On September 23, 2019, approximately $3.06 billion aggregate principal amount of ANDX’s outstanding senior notes were exchanged for new unsecured senior notes issued by MPLX having the same maturity and interest rates as the ANDX senior notes in an exchange offer and consent solicitation undertaken by MPLX, leaving approximately $690 million aggregate principal of outstanding senior notes held by ANDX. Of this, $500 million is related to the 5.5% unsecured senior notes due 2019. The principal amount of $500 million and accrued interest of $14 million was paid on October 15, 2019 and includes interest through the payoff date.

Upon the completion of the merger of MPLX and ANDX on July 30, 2019, the MPLX bank revolving credit facility was amended and restated to increase the borrowing capacity to $3.5 billion and to extend the maturity date to July 30, 2024. The ANDX revolving and dropdown credit facilities were terminated and all outstanding balances were repaid and funded with the new $3.5 billion bank revolving credit facility.

On July 26, 2019, we entered into a new $1 billion 364-day revolving credit facility with a syndicate of banks that became effective upon the expiration of our existing $1 billion 364-day revolving facility in September 2019. The new 364-day revolving credit facility contains substantially the same terms and conditions as our existing 364-day revolving credit facility and will expire in September 2020. 

On July 19, 2019, we amended our $750 million trade receivables securitization facility to extend the maturity date to July 16, 2021.

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On July 31, 2019, in connection with the closing of the ANDX merger, we amended and restated the existing intercompany loan agreement with MPLX to, among other things, increase MPLX’s borrowing capacity thereunder from $1.0 billion to $1.5 billion in loans at any one time outstanding and to extend the term of the intercompany loan agreement to July 31, 2024.

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. As of September 30, 2019, we had no commercial paper borrowings outstanding.

See Note 17 to the unaudited consolidated financial statements for further discussion of our debt.

The MPC credit agreements contain 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 agreements 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 September 30, 2019, we were in compliance with this financial covenant, with a ratio of Consolidated Net Debt to Total Capitalization of 0.21 to 1.00, as well as the other covenants contained in the MPC bank revolving credit facility.

The MPLX credit agreement contains representations and warranties, affirmative and negative covenants and events of default that we consider usual and customary for agreements of these types. The MPLX credit agreement includes a financial covenant that requires MPLX to maintain a ratio of Consolidated Total Debt (as defined in the MPLX credit agreement) as of the end of each fiscal quarter to Consolidated EBITDA (as defined in the MPLX credit agreement) for the prior four fiscal quarters of not 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 September 30, 2019, MPLX was in compliance with this debt covenant, with a ratio of Consolidated Total Debt to Consolidated EBITDA of 3.80 to 1.0, as well as the other covenants contained in the MPLX credit agreement.

Our intention is to maintain an investment-grade credit profile. As of November 1, 2019, the credit ratings on our senior unsecured debt were as follows.

 

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

None of the MPC credit agreements, the MPLX credit agreement, or our trade receivables facility contains 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 under such agreements. In addition, a downgrade of our senior unsecured debt rating to below investment-grade levels could, under certain circumstances, decrease the amount of trade receivables that are eligible to be sold under our trade receivables facility, impact our ability to purchase crude oil on an unsecured basis, result in us having to post letters of credit under existing transportation services or other agreements and make it more difficult to raise capital in the future.

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Capital Requirements

Capital Investment Plan

MPC's capital investment plan for 2019 totals approximately $2.8 billion for capital projects and investments, excluding MPLX, capitalized interest and acquisitions. MPC’s capital investment plan includes approximately $1.8 billion of growth capital and $1.0 billion of maintenance capital. This plan includes all of the planned capital spending for Refining & Marketing, Retail and Corporate as well as a portion of the planned capital investments in Midstream. MPLX’s capital investment plan for 2019, excluding capitalized interest and acquisitions, includes $2.8 billion of organic growth capital and approximately $300 million of maintenance capital. We continuously evaluate our capital investment plan and make changes as conditions warrant.

Capital expenditures and investments are summarized by segment below. These amounts include capital spending and investments related to businesses acquired in connection with the Andeavor acquisition from October 1, 2018 forward.

	Nine Months Ended  September 30,
(In millions)	2019		2018
Refining & Marketing	$	1,385	$	613
Retail	370		225
Midstream	2,420		1,676
Corporate and Other(a)	141		97
Total capital expenditures and investments	$	4,316	$	2,611

^(a)  Includes capitalized interest of $97 million and $55 million for the nine months ended September 30, 2019 and 2018, respectively.

Capital expenditures and investments in affiliates during the nine months ended September 30, 2019 were primarily for Midstream and Refining & Marketing segment projects and investments in affiliates.

The Midstream segment capital investment plan primarily includes projects for MPLX. MPLX’s capital investment plan includes the addition of approximately 825 MMcf/d of processing capacity at five gas processing plants, two in the Marcellus and three in the Southwest, which expands MPLX’s processing capacity in the Permian Basin and the STACK shale play of Oklahoma. The MPLX capital investment plan also includes the addition of approximately 100 mbpd of fractionation capacity in the Marcellus and Utica basins and the continued expansion of MPLX’s marine fleet, long-haul crude oil, natural gas and NGL pipelines, projects to increase its export capability, the construction of additional crude storage capacity for unloading of marine vessels, the construction of crude gathering systems to provide connectivity to multiple long-haul pipelines and a pipeline interconnect project to provide direct connectivity between certain MPC refineries. The non-MPLX Midstream segment’s capital expenditures and investments relate to investments in equity affiliate pipelines, including our expected investments in the Gray Oak Pipeline, a new pipeline spanning from the West Texas Permian Basin to the Gulf Coast which is expected to be in service by the end of 2019.

The Refining & Marketing segment capital investment plan includes projects focused on high-return investments in refinery optimization, production of higher value products, increased capacity to upgrade residual fuel oil and expanded export capacity. We also plan to continue investing in domestic light products supply placement flexibility.

Other Capital Requirements

During the nine months ended September 30, 2019, we contributed $267 million to our funded pension plans, largely consisting of voluntary contributions, and have additional required funding for the 2019 plan year of approximately $32 million. We may choose to make additional contributions to our pension plans.

On October 30, 2019, our board of directors approved a dividend of $0.53 per share on common stock. The dividend is payable December 10, 2019, to shareholders of record as of the close of business on November 20, 2019.

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

Share Repurchases

Since January 1, 2012, our board of directors has approved $18.0 billion in total share repurchase authorizations and we have repurchased a total of $14.98 billion of our common stock, leaving $3.02 billion available for repurchases at September 30, 2019. The table below summarizes our total share repurchases for the nine months ended September 30, 2019 and 2018. See Note 8 to the unaudited consolidated financial statements for further discussion of the share repurchase plans.

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	Nine Months Ended  September 30,
(In millions, except per share data)	2019		2018
Number of shares repurchased	33		36
Cash paid for shares repurchased	$	1,885	$	2,612
Average cost per share	$	58.75	$	71.80

We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, 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 September 30, 2019, our contractual cash obligations included long-term debt, capital and operating lease obligations, purchase obligations and other long-term liabilities. During the first nine months of 2019, our long-term debt commitments increased approximately $1.67 billion primarily due to MPLX’s issuance of floating rate senior notes and borrowings under its term loan, partially offset by interest payments made during the period.

There were no other material changes to our contractual cash obligations outside the ordinary course of business since December 31, 2018.

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 liquidity and capital resources.

We have provided various guarantees related to equity method investees. In conjunction with our spinoff from Marathon Oil, we entered into various indemnities and guarantees to Marathon Oil. These arrangements are described in Note 23 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.

On March 3, 2014, the EPA signed the final Tier 3 fuel standards. The final Tier 3 fuel standards require, among other things, a lower annual average sulfur level in gasoline to no more than 10 ppm beginning in calendar year 2017. In addition, gasoline refiners and importers may not exceed a maximum per-gallon sulfur standard of 80 ppm while retailers may not exceed a maximum per-gallon sulfur standard of 95 ppm. From 2014 through 2018, we made approximately $490 million in capital expenditures to comply with these standards. We expect to make approximately $245 million in capital expenditures for these standards in 2019 with $45 million of these capital expenditures remaining as of September 30, 2019.

There have been no significant changes to our environmental matters and compliance costs during the nine months ended September 30, 2019.

CRITICAL ACCOUNTING ESTIMATES

As of September 30, 2019, 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, 2018.

ACCOUNTING STANDARDS NOT YET ADOPTED

As discussed in Note 2 to the unaudited consolidated financial statements, certain new financial accounting pronouncements will be effective for our financial statements in the future.

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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, 2018.

See Notes 15 and 16 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 losses on our commodity derivative positions as of September 30, 2019 and 2018, respectively.

	Nine Months Ended  September 30,
(In millions)	2019			2018
Realized gain (loss) on settled derivative positions	$	54		$	(95	)
Unrealized loss on open net derivative positions	(87		)	(56		)
Net loss	$	(33	)	$	(151	)

See Note 16 to the unaudited consolidated financial statements for additional information on our open derivative positions at September 30, 2019.

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 September 30, 2019 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 September 30, 2019
Crude	$	(61	)	$	(153	)	$	61		$	153
Refined products	32			80			(32		)	(80		)
Blending products	(14		)	(36		)	14			36
Embedded derivatives	(5		)	(14		)	5			14

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 September 30, 2019 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 September 30, 2019 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.

(In millions)	Fair Value as of September 30, 2019(a)		Change in Fair Value(b)		Change in Net Income for the Nine Months Ended September 30, 2019(c)
Long-term debt
Fixed-rate	$	27,979	$	2,609	n/a
Variable-rate	2,507		n/a		13

^(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 September 30, 2019.

^(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 nine months ended September 30, 2019.

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At September 30, 2019, our portfolio of long-term debt was comprised of fixed-rate instruments and variable-rate borrowings. 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 15 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 Rules 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 September 30, 2019, the end of the period covered by this report.

Changes in Internal Control over Financial Reporting

During the quarter ended September 30, 2019, 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.

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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. Except as described below, there have been no material changes to the legal proceedings previously disclosed in our Annual Report on Form 10-K, as updated in the Quarterly Reports on Form 10-Q for the quarters ended March 31, 2019 and June 30, 2019.

Litigation

As previously disclosed, in May 2007, the Kentucky attorney general filed a lawsuit against us and Marathon Oil in state court in Franklin County, Kentucky for alleged violations of Kentucky’s emergency pricing and consumer protection laws following Hurricanes Katrina and Rita in 2005. The lawsuit alleged that we overcharged customers by $89 million during September and October 2005. The complaint sought disgorgement of these sums, as well as penalties, under Kentucky’s emergency pricing and consumer protection laws. In May 2011, the Kentucky attorney general amended his complaint to include a request for immediate injunctive relief as well as unspecified damages and penalties related to our wholesale gasoline pricing in April and May 2011 under statewide price controls that were activated by the Kentucky governor on April 26, 2011 and which have since expired. The court denied the attorney general’s request for immediate injunctive relief. As disclosed in our Quarterly Report on Form 10-Q for the quarter ended June 30, 2019, in July 2019, MPC and the attorney general reached a settlement to resolve this litigation. This resolution did not have a material adverse effect on our consolidated financial position, results of operations or cash flows.

Environmental Proceedings

Galveston Bay Refinery

In August 2019, we received an offer from the Texas Commission on Environmental Quality to settle violations alleged in enforcement notices issued to the refinery in March 2019. The notices allege violations of emissions limitations and other requirements of the refinery’s air permit. We are negotiating a settlement of the allegations and cannot currently estimate the timing of the resolution of this matter.

Los Angeles Refinery

As previously disclosed in our 2018 10-K, CARB issued an NOV to the Los Angeles refinery in 2017, alleging violations of the state’s summer RVP limits. On August 9, 2019, we agreed to settle the NOV for $133,000, of which half will be paid to CARB and half will be paid to the South Coast Air Quality Management District as a supplemental environmental project.

As previously disclosed in our 2018 10-K, CARB issued an NOV to the Los Angeles refinery in 2018, alleging the refinery produced fuel which exceeded its reported olefin values. On August 9, 2019, we agreed to settle the NOV for $119,000, of which half will be paid to CARB and half will be paid to the South Coast Air Quality Management District as a supplemental environmental project.

ITEM 1A. RISK FACTORS

Except as disclosed below, 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, 2018, as updated in our Quarterly Report on Form 10-Q for the quarters ended March 31, 2019 and June 30, 2019.

Our proposed spin-off of Speedway may not be completed on the currently contemplated timeline or at all and may not achieve the intended benefits.

We have announced our intent to separate Speedway into an independent, publicly traded company by the end of 2020. The spin-off is subject to certain conditions, including final approval by our board of directors, receipt of customary assurances regarding the intended tax-free nature of the transaction and the filing and effectiveness of a registration statement with the U.S. Securities and Exchange Commission. Unanticipated developments, including possible delays in obtaining various regulatory approvals or clearances, uncertainty of the financial markets and challenges in establishing infrastructure or processes, could delay or prevent the proposed spin-off or cause the proposed spin-off to occur on terms or conditions that are less favorable or different than expected. Even if the spin-off is completed, we may not realize some or all of the anticipated benefits from the spin-off. On November 1, 2019, Moody’s announced it had changed its outlook for MPC’s and MPLX’s credit ratings from stable to negative following the announcement of the planned spin-off and Midstream review, and the planned spin-off and Midstream review could be factors causing or contributing to a future determination by one or more of the rating agencies to lower MPC’s or MPLX’s credit rating. Expenses incurred to accomplish the proposed spin-off may be significantly higher than what we currently anticipate. Executing the proposed spin-off also requires significant time and attention from management, which could distract them from other tasks in operating our business. Following the proposed spin-

61

off, the combined value of the common stock of the two publicly traded companies may not be equal to or greater than what the value of our common stock would have been had the proposed spin-off not occurred. If the proposed spin-off is completed, our diversification of revenue sources will diminish due to the separation of the Speedway business, and it is possible that our business, financial condition, results of operations and cash flows may be subject to increased volatility as a result.

Our ongoing review of other strategic alternatives for our Midstream business may pose additional risks to our business.

Our board of directors has also formed a special committee to enhance our evaluation of potential value-creating options for our Midstream business, which we primarily conduct through MPLX. Our exploration of strategic alternatives, including any uncertainty created by this process, involves a number of risks: significant fluctuations in our stock price could occur in response to developments relating to the strategic review process or market speculation regarding any such developments; we may encounter difficulties in hiring, retaining and motivating key personnel during this process or as a result of uncertainties generated by this process or any developments or actions relating to it; we may incur substantial increases in general and administrative expense associated with increased legal fees and the need to retain and compensate third-party advisors; and we may experience difficulties in preserving the commercially sensitive information that may need to be disclosed to third parties during this process or in connection with an assessment of our strategic alternatives. As noted above, on November 1, 2019, Moody’s announced that it had changed its outlook for MPC’s and MPLX’s credit ratings from stable to negative following the announcement of the planned spin-off and Midstream review, and the planned spin-off and Midstream review could be factors causing or contributing to a future determination by one or more of the rating agencies to lower MPC’s or MPLX’s credit ratings. The strategic review process also requires significant time and attention from management, which could distract them from other tasks in operating our business. There can be no assurance that this process will result in the pursuit or consummation of any strategic transaction. The occurrence of any one or more of the above risks could have a material adverse impact on our business, financial condition, results of operations and cash flows.

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 September 30, 2019, 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)
07/01/2019-07/31/2019	1,177,714	$	55.24	1,176,389	$	3,454,603,445
08/01/2019-08/31/2019	229	56.72		—	3,454,603,445
09/01/2019-09/30/2019	8,115,381	53.61		8,114,953	3,019,550,854
Total	9,293,324	53.82		9,291,342

^(a)  The amounts in this column include 1,325, 229 and 428 shares of our common stock delivered by employees to MPC, upon vesting of restricted stock, to satisfy tax withholding requirements in July, August and September, respectively.

^(b)  Amounts in this column reflect the weighted average price paid for shares purchased 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. The weighted average price includes commissions paid to brokers on shares purchased under our share repurchase authorizations.

^(c)  On April 30, 2018, we announced that our board of directors had approved a $5.0 billion share repurchase authorization. This share repurchase authorization has no expiration date. The share repurchase authorization announced on April 30, 2018, together with prior authorizations, results in a total of $18.0 billion of share repurchase authorizations since January 1, 2012.

ITEM 5. OTHER INFORMATION

None

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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 April 29, 2018, by and among MPC, Andeavor, Mahi Inc. and Mahi LLC	8-K	2.1	4/30/2018	001-35054
2.2	Amendment to Agreement and Plan of Merger, dated as of July 3, 2018, by and among Andeavor, MPC, Mahi Inc. and Mahi LLC	S-4/A	2.2	7/5/2018	333-225244
2.3	Second Amendment to Agreement and Plan of Merger, dated as of September 18, 2018, by and among Andeavor, MPC, Mahi Inc. and Mahi LLC	8-K	2.1	9/18/2018	001-35054
2.4 *	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
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 February 27, 2019	10-K	3.2	2/28/2019	001-35054
4.1	Fifteenth Supplemental Indenture, dated as of September 9, 2019, between the Issuer and The Bank of New York Mellon Trust Company, N.A., as Trustee (including form of note)	8-K	4.5	9/9/2019	001-35714
4.2	Sixteenth Supplemental Indenture, dated as of September 9, 2019, between the Issuer and The Bank of New York Mellon Trust Company, N.A., as Trustee (including form of note)	8-K	4.6	9/9/2019	001-35714
4.3	Seventeenth Supplemental Indenture, dated as of September 23, 2019, between MPLX LP and the Bank of New York Mellon Trust Company, N.A.	8-K	4.1	9/27/2019	001-35714
4.4	Eighteenth Supplemental Indenture, dated as of September 23, 2019, between MPLX LP and the Bank of New York Mellon Trust Company, N.A.	8-K	4.2	9/27/2019	001-35714
4.5	Nineteenth Supplemental Indenture, dated as of September 23, 2019, between MPLX LP and the Bank of New York Mellon Trust Company, N.A.	8-K	4.3	9/27/2019	001-35714
4.6	Twentieth Supplemental Indenture, dated as of September 23, 2019, between MPLX LP and the Bank of New York Mellon Trust Company, N.A.	8-K	4.4	9/27/2019	001-35714
4.7	Twenty-First Supplemental Indenture, dated as of September 23, 2019, between MPLX LP and the Bank of New York Mellon Trust Company, N.A.	8-K	4.5	9/27/2019	001-35714
4.8	Twenty-Second Supplemental Indenture, dated as of September 23, 2019, between MPLX LP and the Bank of New York Mellon Trust Company, N.A.	8-K	4.6	9/27/2019	001-35714
4.9	Sixth Supplemental Indenture, dated as of September 6, 2019, to Indenture dated as of October 29, 2014, among Andeavor Logistics LP (f/k/a Tesoro Logistics LP), Tesoro Logistics Finance Corp. and U.S. Bank National Association, as Trustee	8-K	4.1	9/9/2019	001-35714
4.10	Fourth Supplemental Indenture, dated as of September 6, 2019, to Indenture dated as of May 12, 2016, among Andeavor Logistics LP (f/k/a Tesoro Logistics LP), Tesoro Logistics Finance Corp. and U.S. Bank National Association, as Trustee	8-K	4.2	9/9/2019	001-35714
4.11	Fourth Supplemental Indenture, dated as of September 6, 2019, to Indenture dated as of December 2, 2016, among Andeavor Logistics LP (f/k/a Tesoro Logistics LP), Tesoro Logistics Finance Corp. and U.S. Bank National Association, as Trustee	8-K	4.3	9/9/2019	001-35714
4.12	Second Supplemental Indenture, dated as of September 6, 2019, to Indenture dated as of November 28, 2017, among Andeavor Logistics LP (f/k/a Tesoro Logistics LP), Tesoro Logistics Finance Corp. and U.S. Bank National Association, as Trustee	8-K	4.4	9/9/2019	001-35714

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			Incorporated by Reference			Filed Herewith	Furnished Herewith
Exhibit Number	Exhibit Description	Form	Exhibit	Filing Date	SEC File No.
10.1	Support Agreement, dated as of May 7, 2019, by and among MPLX LP, Andeavor Logistics LP, Tesoro Logistics GP, LLC, Western Refining Southwest, Inc. and Marathon Petroleum Corporation.	8-K	10.1	5/8/2019	001-35054
10.2	Second Amendment to Receivables Purchase Agreement, dated July 19, 2019, by and among MPC Trade Receivables Company LLC, as seller, Marathon Petroleum Company LP, as servicer, MUFG Bank, Ltd., as administrative agent, certain committed purchasers and conduit purchasers that are parties thereto from time to time and certain other parties thereto from time to time as managing agents and letter of credit issuers.	8-K	10.1	7/25/2019	001-35054
10.3	364-Day Revolving Credit Agreement, dated as of July 26, 2019, among MPC, as borrower, JPMorgan Chase Bank, N.A., as administrative agent, each of JPMorgan Chase Bank, N.A., Wells Fargo Securities, LLC, Barclays Bank PLC, Citibank, N.A., BofA Securities, Mizuho Bank, Ltd., MUFG Bank, Ltd. and Royal Bank of Canada, as joint lead arrangers and joint bookrunners, Wells Fargo Bank, National Association, as syndication agent, each of Bank of America, N.A., Barclays Bank PLC, Citibank, N.A., Mizuho Bank, Ltd., MUFG Bank, Ltd., and Royal Bank of Canada, as documentation agents, and the other lenders and issuing banks that are parties thereto.	8-K	10.1	8/1/2019	001-35054
10.4	Amended and Restated Credit Agreement, dated as of July 26, 2019, by and among MPLX, as borrower, Wells Fargo Bank, National Association, as administrative agent, each of Wells Fargo Securities, LLC, JPMorgan Chase Bank, N.A., Barclays Bank PLC, BofA Securities, Inc., Citigroup Global Markets Inc., Mizuho Bank, Ltd., MUFG Bank, Ltd. and Royal Bank of Canada, as joint lead arrangers and joint bookrunners, JPMorgan Chase Bank, N.A., as syndication agent, each of Bank of America, N.A., Barclays Bank PLC, Citigroup Global Markets Inc., Mizuho Bank, Ltd., MUFG Bank, Ltd. and Royal Bank of Canada, as documentation agents, and the other lenders and issuing banks that are parties thereto.	8-K	10.2	8/1/2019	001-35054
10.5	Waiver and Second Amendment to Fourth Amended and Restated Omnibus Agreement, dated as of July 29, 2019, by and among MPC, Andeavor Logistics LP, Tesoro Logistics GP, LLC, Tesoro Refining & Marketing Company LLC, Tesoro Companies, Inc., Tesoro Alaska Company LLC and Marathon Petroleum Company LP.	8-K	10.3	8/1/2019	001-35054
10.6	Term Loan Agreement, dated as of September 26, 2019, by and among MPLX LP, as borrower, Wells Fargo Bank, National Association, as administrative agent, each of Wells Fargo Securities, LLC, BofA Securities, Inc. and Mizuho Bank, Ltd., as joint lead arrangers and joint bookrunners, and the syndication agents, documentation agents and lenders that are parties thereto	8-K	10.1	9/27/2019	001-35714
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	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

* Schedules have been omitted pursuant to Item 601(b)(2) of Regulation S-K. Marathon Petroleum Corporation hereby undertakes to furnish supplementally a copy of any omitted schedule upon request by the SEC.

64

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.

November 4, 2019	MARATHON PETROLEUM CORPORATION
	By:	/s/ John J. Quaid
		John J. Quaid Vice President and Controller

65

EX-31.1

Exhibit 31.1

MARATHON PETROLEUM CORPORATION

CERTIFICATION PURSUANT TO SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Gary R. Heminger, 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:	November 4, 2019	/s/ Gary R. Heminger
		Gary R. Heminger
		Chairman of the Board 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, Donald C. Templin, 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:	November 4, 2019	/s/ Donald C. Templin
		Donald C. Templin
		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 September 30, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gary R. Heminger, Chairman of the Board 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.

November 4, 2019

/s/ Gary R. Heminger

Gary R. Heminger

Chairman of the Board 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 September 30, 2019 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Donald C. Templin, 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.

November 4, 2019

/s/ Donald C. Templin

Donald C. Templin

Executive Vice President and Chief Financial Officer

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Equity - Share Repurchases (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity [Abstract]
Number of shares repurchased	10	5	33	36
Cash paid for shares repurchased	$ 500	$ 400	$ 1,885	$ 2,612
Average cost per share	$ 53.82	$ 73.03	$ 58.75	$ 71.80

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Equity Method Investments (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019		Sep. 30, 2018
Contribution of net assets to Capline LLC		$ 143	[1]	$ 0
Recognition of Capline LLC equity method investment		$ 350	[1]	$ 0
Capline
Undivided joint interest, ownership percentage		33.00%
Equity method investments, ownership percentage		33.00%
Contribution of net assets to Capline LLC	[1]	$ 143
Recognition of Capline LLC equity method investment	[1]	350
Capline restructuring gain	[1]	$ 207

[1] See Note 13.

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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 65	$ 68	$ 61	$ 66
Unrealized and realized losses included in net income	(9)	20	(2)	29
Settlements of derivative instruments	(2)	(4)	(5)	(11)
Ending balance	$ 54	$ 84	$ 54	$ 84

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Segment Information - Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Plus items not allocated to segments:
Capital expenditures	[1]	$ 1,386	$ 841	$ 3,524	$ 2,389
Operating Segments
Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures [Line Items]
Capital expenditures and investments	[2]	1,521	917	4,175	2,514
Less investments in equity method investees		197	104	792	222
Corporate and Other
Plus items not allocated to segments:
Corporate		30	7	44	42
Capitalized interest		$ 32	$ 21	$ 97	$ 55

[1] Capital expenditures include changes in capital accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2019 and 2018 as reported in the consolidated statements of cash flows.

[2] Capital expenditures include changes in capital accruals and investments in affiliates. See reconciliation from segment totals to MPC consolidated total capital expenditures below.

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Master Limited Partnership - Dropdowns to MPLX and GP/IDR Exchange (Details) - MPLX shares in Millions, $ in Billions	Feb. 01, 2018 USD ($) shares
MPLX 364-day term loan
Noncontrolling Interest [Line Items]
Maximum borrowing capacity | $	$ 4.1
Debt instrument, term	364 days
Cash and Cash Equivalents
Noncontrolling Interest [Line Items]
Cash consideration | $	$ 4.1
Limited Partner
Noncontrolling Interest [Line Items]
Units issued, number of units	112
Conversion of stock, units issued	275
General Partner
Noncontrolling Interest [Line Items]
Units issued, number of units	2

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Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Lease, Cost

Under ASC 842, the components of lease cost were as follows:

	Three Months Ended  September 30,		Nine Months Ended  September 30,
(In millions)	2019		2019
Finance lease cost:
Amortization of right of use assets	$	17	$	46
Interest on lease liabilities	12		32
Operating lease cost	209		597
Variable lease cost	23		66
Short-term lease cost	197		511
Total lease cost	$	458	$	1,252

Supplemental Balance Sheet Disclosures [Text Block]

Supplemental balance sheet data related to leases were as follows:

(In millions)	September 30, 2019
Operating leases
Assets
Right of use assets	$	2,522
Liabilities
Operating lease liabilities	$	586
Long-term operating lease liabilities	1,962
Total operating lease liabilities	$	2,548
Weighted average remaining lease term (in years)	6.4
Weighted average discount rate	4.09		%
Finance leases
Assets
Property, plant and equipment, gross	$	814
Accumulated depreciation	224
Property, plant and equipment, net	$	590
Liabilities
Debt due within one year	$	55
Long-term debt	654
Total finance lease liabilities	$	709
Weighted average remaining lease term (in years)	12.1
Weighted average discount rate	6.56		%

Schedule Of Future Minimum Lease Payments For Operating And Capital Leases Table [Text Block]

As of September 30, 2019, maturities of lease liabilities for operating lease obligations and finance lease obligations having initial or remaining non-cancellable lease terms in excess of one year are as follows:

(In millions)	Operating		Finance
2019	$	174	$	29
2020	665		94
2021	572		86
2022	388		94
2023	277		96
2024 and thereafter	855		611
Gross lease payments	2,931		1,010
Less: imputed interest	383		301
Total lease liabilities	$	2,548	$	709

Presented in accordance with ASC 840, future minimum commitments as of December 31, 2018 for operating lease obligations and capital lease obligations having initial or remaining non-cancellable lease terms in excess of one year were as follows:

(In millions)	Operating		Capital
2019	$	709	$	70
2020	619		71
2021	553		66
2022	389		75
2023	295		82
2024 and thereafter	858		586
Total minimum lease payments	$	3,423	950
Less: imputed interest costs			301
Present value of net minimum lease payments			$	649

Schedule of Future Minimum Rental Payments Receivable for Operating Leases [Table Text Block]

The following is a schedule of minimum future rentals on the non‑cancellable operating leases as of September 30, 2019:

(In millions)
2019	$	47
2020	186
2021	178
2022	176
2023	170
2024 and thereafter	1,269
Total minimum future rentals	$	2,026

Schedule of Property Subject to or Available for Operating Lease [Table Text Block]

The following schedule summarizes our investment in assets held for operating lease by major classes as of September 30, 2019:

(In millions)	September 30, 2019
Natural gas gathering and NGL transportation pipelines and facilities	$	1,061
Natural gas processing facilities	633
Terminal and related assets	82
Land, building, office equipment and other	45
Property, plant and equipment	1,821
Less accumulated depreciation	304
Property, plant and equipment, net	$	1,517

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Revenue (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue from External Customers by Products and Services [Table Text Block]

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

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2019
Refined products	$	20,330	$	6,956	$	176	$	27,462
Merchandise	1		1,697		—		1,698
Crude oil and refinery feedstocks	945		—		41		986
Midstream services and other	161		24		712		897
Sales and other operating revenues	$	21,437	$	8,677	$	929	$	31,043

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2018
Refined products	$	15,636	$	4,051	$	238	$	19,925
Merchandise	1		1,339		—		1,340
Crude oil and refinery feedstocks	1,009		—		60		1,069
Midstream services and other	105		5		544		654
Sales and other operating revenues	$	16,751	$	5,395	$	842	$	22,988

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2019
Refined products	$	60,963	$	20,206	$	593	$	81,762
Merchandise	3		4,719		—		4,722
Crude oil and refinery feedstocks	3,682		—		145		3,827
Midstream services and other	395		72		2,079		2,546
Sales and other operating revenues	$	65,043	$	24,997	$	2,817	$	92,857

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2018
Refined products	$	43,493	$	11,462	$	649	$	55,604
Merchandise	3		3,753		—		3,756
Crude oil and refinery feedstocks	2,871		—		154		3,025
Midstream services and other	268		16		1,502		1,786
Sales and other operating revenues	$	46,635	$	15,231	$	2,305	$	64,171

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Leases Supplemental Balance Sheet Disclosure (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Operating leases
Right of use assets	$ 2,522	$ 0
Operating lease liabilities	586	0
Long-term operating lease liabilities	1,962	0
Total operating lease liabilities	$ 2,548
Weighted average remaining lease term (in years)	6 years 4 months 24 days
Weighted average discount rate	4.09%
Finance leases
Property, plant and equipment, gross	$ 63,290	61,213
Less accumulated depreciation	18,256	16,155
Property, plant and equipment, net	45,034	45,058
Debt due within one year	557	544
Long-term debt	28,282	26,980
Total finance lease liabilities	709	$ 649
Finance Lease
Finance leases
Property, plant and equipment, gross	814
Less accumulated depreciation	224
Property, plant and equipment, net	590
Debt due within one year	55
Long-term debt	654
Total finance lease liabilities	$ 709
Weighted average remaining lease term (in years)	12 years 1 month 6 days
Weighted average discount rate	6.56%

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Revenue

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue

REVENUE

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

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2019
Refined products	$	20,330	$	6,956	$	176	$	27,462
Merchandise	1		1,697		—		1,698
Crude oil and refinery feedstocks	945		—		41		986
Midstream services and other	161		24		712		897
Sales and other operating revenues	$	21,437	$	8,677	$	929	$	31,043

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2018
Refined products	$	15,636	$	4,051	$	238	$	19,925
Merchandise	1		1,339		—		1,340
Crude oil and refinery feedstocks	1,009		—		60		1,069
Midstream services and other	105		5		544		654
Sales and other operating revenues	$	16,751	$	5,395	$	842	$	22,988

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2019
Refined products	$	60,963	$	20,206	$	593	$	81,762
Merchandise	3		4,719		—		4,722
Crude oil and refinery feedstocks	3,682		—		145		3,827
Midstream services and other	395		72		2,079		2,546
Sales and other operating revenues	$	65,043	$	24,997	$	2,817	$	92,857

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2018
Refined products	$	43,493	$	11,462	$	649	$	55,604
Merchandise	3		3,753		—		3,756
Crude oil and refinery feedstocks	2,871		—		154		3,025
Midstream services and other	268		16		1,502		1,786
Sales and other operating revenues	$	46,635	$	15,231	$	2,305	$	64,171

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 September 30, 2019, 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 September 30, 2019 include matching buy/sell receivables of $2.25 billion.

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Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Lessee, Finance and Operating Lease

LEASES

For further information regarding the adoption of ASC 842, including the method of adoption and practical expedients elected, see Note 2.

Lessee

We lease a wide variety of facilities and equipment including land and building space, office and field equipment, storage facilities and transportation equipment. Our remaining lease terms range from less than one year to 60 years. Most long-term leases include renewal options ranging from less than one year to 50 years and, in certain leases, also include purchase options. The lease term included in the measurement of right of use assets and lease liabilities includes options to extend or terminate our leases that we are reasonably certain to exercise. Options were included in the lease term primarily for retail store sites where we constructed property, plant and equipment on leased land that is expected to exist beyond the initial lease term.

Under ASC 842, the components of lease cost were as follows:

	Three Months Ended  September 30,		Nine Months Ended  September 30,
(In millions)	2019		2019
Finance lease cost:
Amortization of right of use assets	$	17	$	46
Interest on lease liabilities	12		32
Operating lease cost	209		597
Variable lease cost	23		66
Short-term lease cost	197		511
Total lease cost	$	458	$	1,252

Supplemental balance sheet data related to leases were as follows:

(In millions)	September 30, 2019
Operating leases
Assets
Right of use assets	$	2,522
Liabilities
Operating lease liabilities	$	586
Long-term operating lease liabilities	1,962
Total operating lease liabilities	$	2,548
Weighted average remaining lease term (in years)	6.4
Weighted average discount rate	4.09		%
Finance leases
Assets
Property, plant and equipment, gross	$	814
Accumulated depreciation	224
Property, plant and equipment, net	$	590
Liabilities
Debt due within one year	$	55
Long-term debt	654
Total finance lease liabilities	$	709
Weighted average remaining lease term (in years)	12.1
Weighted average discount rate	6.56		%

As of September 30, 2019, maturities of lease liabilities for operating lease obligations and finance lease obligations having initial or remaining non-cancellable lease terms in excess of one year are as follows:

(In millions)	Operating		Finance
2019	$	174	$	29
2020	665		94
2021	572		86
2022	388		94
2023	277		96
2024 and thereafter	855		611
Gross lease payments	2,931		1,010
Less: imputed interest	383		301
Total lease liabilities	$	2,548	$	709

Presented in accordance with ASC 840, future minimum commitments as of December 31, 2018 for operating lease obligations and capital lease obligations having initial or remaining non-cancellable lease terms in excess of one year were as follows:

(In millions)	Operating		Capital
2019	$	709	$	70
2020	619		71
2021	553		66
2022	389		75
2023	295		82
2024 and thereafter	858		586
Total minimum lease payments	$	3,423	950
Less: imputed interest costs			301
Present value of net minimum lease payments			$	649

Leases of Lessor Disclosure

Lessor

MPLX has certain natural gas gathering, transportation and processing agreements in which it is considered to be the lessor under several implicit operating lease arrangements in accordance with GAAP. MPLX’s primary implicit lease operations relate to a natural gas gathering agreement in the Marcellus region for which it earns a fixed-fee for providing gathering services to a single producer using a dedicated gathering system. As the gathering system is expanded, the fixed-fee charged to the producer is adjusted to include the additional gathering assets in the lease. The primary term of the natural gas gathering arrangement expires in 2038 and will continue thereafter on a year-to-year basis until terminated by either party. Other implicit leases relate to a natural gas processing agreement in the Marcellus region and a natural gas processing agreement in the Southern Appalachia region for which MPLX earns minimum monthly fees for providing processing services to a single producer using a dedicated processing plant. The primary terms of these natural gas processing agreements expire during 2023 and 2033.

MPLX did not elect to use the practical expedient to combine lease and non-lease components for lessor arrangements. The tables below represent the portion of the contract allocated to the lease component based on relative standalone selling price. Lessor agreements are currently deemed operating, as we elected the practical expedient to grandfather in historical ASC 840 lease classifications. MPLX may be required to re-classify existing operating leases to sales-type leases upon modification and related reassessment of the leases.

Our revenue from implicit lease arrangements, excluding executory costs, totaled approximately $64 million and $195 million for the three and nine months ended September 30, 2019, respectively. The implicit lease arrangements related to the processing facilities contain contingent rental provisions whereby we receive additional fees if the producer customer exceeds the monthly minimum processed volumes. During the three and nine months ended September 30, 2019, MPLX did not receive any material contingent lease payments. The following is a schedule of minimum future rentals on the non‑cancellable operating leases as of September 30, 2019:

(In millions)
2019	$	47
2020	186
2021	178
2022	176
2023	170
2024 and thereafter	1,269
Total minimum future rentals	$	2,026

The following schedule summarizes our investment in assets held for operating lease by major classes as of September 30, 2019:

(In millions)	September 30, 2019
Natural gas gathering and NGL transportation pipelines and facilities	$	1,061
Natural gas processing facilities	633
Terminal and related assets	82
Land, building, office equipment and other	45
Property, plant and equipment	1,821
Less accumulated depreciation	304
Property, plant and equipment, net	$	1,517

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Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of new accounting principle in period of adoption	$ 64				$ 63		$ 1
Beginning balance at Dec. 31, 2017	20,828	$ 7	$ (9,869)	$ 11,262	12,864	$ (231)	6,795
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	219				37		182
Dividends declared on common stock	(219)				(219)
Distributions to noncontrolling interests	(179)						(179)
Contributions from noncontrolling interests	1						1
Other comprehensive income (loss)	(2)					(2)
Shares repurchased	(1,327)		(1,327)
Shares returned - stock based compensation			(4)
Shares issued - stock based compensation				27
Net shares issued - stock based compensation	24						1
Equity transactions of MPLX & ANDX	(546)			2,380			(2,926)
Ending balance at Mar. 31, 2018	18,863	7	(11,200)	13,669	12,745	(233)	3,875
Beginning balance at Dec. 31, 2017	20,828	7	(9,869)	11,262	12,864	(231)	6,795
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	63
Equity transactions of MPLX & ANDX				2,382
Ending balance at Sep. 30, 2018	19,031	7	(12,495)	13,703	14,119	(168)	3,865
Beginning balance at Mar. 31, 2018	18,863	7	(11,200)	13,669	12,745	(233)	3,875
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,215				1,055		160
Dividends declared on common stock	(211)				(211)
Distributions to noncontrolling interests	(182)						(182)
Contributions from noncontrolling interests	4						4
Shares repurchased	(885)		(885)
Shares returned - stock based compensation			(8)
Shares issued - stock based compensation				18
Net shares issued - stock based compensation	14						4
Equity transactions of MPLX & ANDX	0			1			(1)
Ending balance at Jun. 30, 2018	18,818	7	(12,093)	13,688	13,589	(233)	3,860
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	922				737		185
Dividends declared on common stock	(207)				(207)
Distributions to noncontrolling interests	(186)						(186)
Contributions from noncontrolling interests	4						4
Other comprehensive income (loss)	65					65
Shares repurchased	(400)		(400)
Shares returned - stock based compensation			(2)
Shares issued - stock based compensation				14
Net shares issued - stock based compensation	15						3
Equity transactions of MPLX & ANDX	0			1			(1)
Ending balance at Sep. 30, 2018	19,031	7	(12,495)	13,703	14,119	(168)	3,865
Beginning balance at Dec. 31, 2018	44,049	10	(13,175)	33,729	14,755	(144)	8,874
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	239				(7)		246
Dividends declared on common stock	(357)				(357)
Distributions to noncontrolling interests	(305)						(305)
Contributions from noncontrolling interests	95						95
Other comprehensive income (loss)	(7)					(7)
Shares repurchased	(885)		(885)
Shares returned - stock based compensation			(3)
Shares issued - stock based compensation				32
Net shares issued - stock based compensation	28						(1)
Equity transactions of MPLX & ANDX	2			3			(1)
Other	(1)						(1)
Ending balance at Mar. 31, 2019	42,858	10	(14,063)	33,764	14,391	(151)	8,907
Beginning balance at Dec. 31, 2018	44,049	10	(13,175)	33,729	14,755	(144)	8,874
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(68)
Equity transactions of MPLX & ANDX				(686)
Ending balance at Sep. 30, 2019	42,656	10	(15,076)	33,125	15,891	(212)	8,918
Beginning balance at Mar. 31, 2019	42,858	10	(14,063)	33,764	14,391	(151)	8,907
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,346				1,106		240
Dividends declared on common stock	(351)				(351)
Distributions to noncontrolling interests	(295)						(295)
Other comprehensive income (loss)	(10)					(10)
Shares repurchased	(500)		(500)
Shares returned - stock based compensation			(10)
Shares issued - stock based compensation				19
Net shares issued - stock based compensation	11						2
Equity transactions of MPLX & ANDX	1			2			(1)
Other	1						1
Ending balance at Jun. 30, 2019	43,061	10	(14,573)	33,785	15,146	(161)	8,854
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,347				1,095		252
Dividends declared on common stock	(350)				(350)
Distributions to noncontrolling interests	(289)						(289)
Other comprehensive income (loss)	(51)					(51)
Shares repurchased	(500)		(500)
Shares returned - stock based compensation			3
Shares issued - stock based compensation				31
Net shares issued - stock based compensation	30						2
Equity transactions of MPLX & ANDX	(596)			(691)			95
Other	4						4
Ending balance at Sep. 30, 2019	$ 42,656	$ 10	$ (15,076)	$ 33,125	$ 15,891	$ (212)	$ 8,918

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Leases Schedule of Property Subject to or Available for Operating Lease (Details) $ in Millions	Sep. 30, 2019 USD ($)
Property, plant and equipment	$ 1,821
Less accumulated depreciation	304
Property, plant and equipment, net	1,517
Natural gas gathering and NGL transportation pipelines and facilities
Property, plant and equipment	1,061
Natural gas processing facilities
Property, plant and equipment	633
Terminal and related assets
Property, plant and equipment	82
Land, building, office equipment and other
Property, plant and equipment	$ 45

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Master Limited Partnership (Tables)

9 Months Ended

Sep. 30, 2019

Noncontrolling Interest [Abstract]

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

As a result of equity transactions of MPLX and ANDX, 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 and ANDX were as follows:

	Nine Months Ended  September 30,
(In millions)	2019			2018
Increase due to the issuance of MPLX common units and general partner units to MPC	$	—		$	1,114
Increase due to GP/IDR Exchange	—			1,808
Increase (decrease) due to the issuance of MPLX & ANDX common units	(52		)	6
Increase (decrease) in MPC's additional paid-in capital	(52		)	2,928
Tax impact	(634		)	(546		)
Increase (decrease) in MPC's additional paid-in capital, net of tax	$	(686	)	$	2,382

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Commitments and Contingencies - Guarantees (Details) $ in Millions	Sep. 30, 2019 USD ($)
Other Guarantees
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 122
LOOP and LOCAP LLC | Guarantee of Indebtedness of Others | Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 171
Gray Oak Pipeline
Loss Contingencies [Line Items]
Equity method investments, ownership percentage	25.00%
Gray Oak Pipeline | Guarantee of Indebtedness of Others | Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 226
Maximum borrowing capacity	1,430
Bakken Pipeline System | Other Guarantees
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 230
Crowley Ocean Partners
Loss Contingencies [Line Items]
Equity method investments, ownership percentage	50.00%
Crowley Ocean Partners | Guarantee of Indebtedness of Others | Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 125
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]
Equity method investments, ownership percentage	50.00%
Crowley Blue Water Partners | Guarantee of Indebtedness of Others | Financial Guarantee
Loss Contingencies [Line Items]
Maximum potential undiscounted payments	$ 122
Indirect Ownership Interest | Bakken Pipeline System
Loss Contingencies [Line Items]
Equity method investments, ownership percentage	9.00%
Marathon Oil Companies | Indemnification Agreement
Loss Contingencies [Line Items]
Guarantee obligation current carrying value	$ 1

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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Actuarial changes, tax	$ (14)	$ 24	$ (8)	$ 29
Prior service credit, tax	(3)	(3)	(14)	(7)
Other, tax	$ 0	$ (1)	$ (1)	$ (2)

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Variable Interest Entities

9 Months Ended

Sep. 30, 2019

Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]

Variable Interest Entities

VARIABLE INTEREST ENTITIES

Consolidated VIE

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

The creditors of MPLX do not have recourse to MPC’s general credit through guarantees or other financial arrangements, except as noted. MPC has effectively guaranteed certain indebtedness of LOOP LLC (“LOOP”) and LOCAP LLC (“LOCAP”), in which MPLX holds an interest. See Note 23 for more information. The assets of MPLX can only be used to settle their own obligations and their creditors have no recourse to our assets, except as noted earlier.

We have consolidated ANDX since October 1, 2018 in accordance with ASC 810. The ANDX balances at December 31, 2018 reflected in the table below are ANDX’s historical balances as the preliminary purchase accounting adjustments related to ANDX’s assets and liabilities in connection with the Andeavor acquisition had not yet been pushed down to ANDX. On July 30, 2019, MPLX acquired ANDX. The MPLX balances at September 30, 2019 reflect the inclusion of ANDX’s balances at the fair values determined in connection with MPC’s acquisition of Andeavor on October 1, 2018. See Notes 3 and 4 for additional information.

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

	September 30, 2019		December 31, 2018
(In millions)	MPLX		MPLX		ANDX
Assets
Cash and cash equivalents	$	41	$	68	$	10
Receivables, less allowance for doubtful accounts	592		425		199
Inventories	104		77		22
Other current assets	71		45		57
Equity method investments	5,182		4,174		602
Property, plant and equipment, net	21,921		14,639		6,845
Goodwill	10,735		2,586		1,051
Right of use assets	366		—		—
Other noncurrent assets	1,364		458		1,242
Liabilities
Accounts payable	$	756	$	776	$	215
Payroll and benefits payable	5		2		10
Accrued taxes	96		48		23
Debt due within one year	510		1		504
Operating lease liabilities	61		—		—
Other current liabilities	276		177		77
Long-term debt	19,190		13,392		4,469
Deferred income taxes	15		13		1
Long-term operating lease liabilities	309		—		—
Deferred credits and other liabilities	383		276		68

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Description of the Business and Basis of Presentation

9 Months Ended

Sep. 30, 2019

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 with more than 3 million barrels per day of crude oil capacity across 16 refineries. We sell refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market, to consumers through our Retail business segment and to independent entrepreneurs who operate approximately 6,800 branded outlets. Our retail operations own and operate approximately 3,930 retail transportation fuel and convenience stores across the United States and also sell transportation fuel to consumers through approximately 1,070 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.

Refer to Note 4 for further information on the Andeavor acquisition, which closed on October 1, 2018, and to Notes 3 and 9 for additional information about our operations.

Refer to Note 24 for further information on planned separation of MPC’s retail transportation fuel and convenience store business, which is operated primarily under the Speedway brand, into an independent, publicly traded company, and the presentation of the results of that business in our consolidated financial statements.

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, 2018. The results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the full year.

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Debt

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Debt

DEBT

Our outstanding borrowings at September 30, 2019 and December 31, 2018 consisted of the following:

(In millions)	September 30, 2019			December 31, 2018
Marathon Petroleum Corporation	$	9,174		$	9,114
MPLX LP	20,120			13,856
ANDX(a)	—			5,010
Total debt	$	29,294		$	27,980
Unamortized debt issuance costs	(137		)	(128		)
Unamortized discount	(318		)	(328		)
Amounts due within one year	(557		)	(544		)
Total long-term debt due after one year	$	28,282		$	26,980

^(a)  On July 30, 2019, MPLX acquired ANDX and assumed its debt obligations. See Note 3 and the discussion below for additional information. The ANDX December 31, 2018 balance includes senior notes of $3,750 million, borrowings under the revolving and dropdown credit facilities of $1,245 million and capital leases of $15 million.

Available Capacity under our Facilities

(Dollars in millions)	Total Capacity		Outstanding Borrowings		Outstanding Letters of Credit		Available Capacity		Weighted Average Interest Rate		Expiration
MPC 364-day bank revolving credit facility	$	1,000	$	—	$	—	$	1,000	—		September 2020
MPC bank revolving credit facility	5,000		—		1		4,999		—		October 2023
MPC trade receivables securitization facility	750		—		—		750		—		July 2021
MPLX bank revolving credit facility	3,500		—		3		3,497		—		July 2024
MPLX term loan facility	1,000		500		—		500		2.795	%	September 2021

MPC 364-Day Bank Revolving Credit Facility

On July 26, 2019, we entered into a new $1 billion 364-day revolving credit facility with a syndicate of banks that become effective upon the expiration of our existing $1 billion 364-day revolving credit facility in September 2019. The new 364-day revolving credit facility contains substantially the same terms and conditions as our existing 364-day revolving credit facility and will expire in September 2020.

MPC Trade Receivables Securitization Facility

On July 19, 2019, we amended our $750 million trade receivables securitization facility to extend the maturity date to July 16, 2021.

MPLX Credit Agreement

Upon the completion of the merger of MPLX and ANDX on July 30, 2019, the MPLX bank revolving credit facility was amended and restated to increase the borrowing capacity to $3.5 billion and to extend the maturity date to July 30, 2024. The ANDX revolving and dropdown credit facilities were terminated and all outstanding balances were repaid and funded with the new $3.5 billion bank revolving credit facility.

MPLX Term Loan

On September 26, 2019, MPLX entered into a term loan agreement with a syndicate of lenders providing for borrowings up to $1 billion available to be drawn in up to four separate borrowings. If not fully utilized, the term loan commitments expire 90 days after September 26, 2019. Borrowings under the term loan agreement bear interest, at MPLX’s election, at either the Adjusted LIBO Rate (as defined in the term loan agreement) plus a margin or the Alternate Base Rate (as defined in the term loan agreement) plus a margin. The applicable margin to the benchmark interest rates fluctuate from time-to-time based on our credit ratings. The proceeds from borrowings under the term loan agreement are to be used to fund the repayment of MPLX’s existing indebtedness and/or for general business purposes. The term loan agreement matures on September 26, 2021 and may be prepaid at any time without premium or penalty.

The term loan agreement contains representations and warranties, affirmative and negative covenants and events of default that we consider to be customary for an agreement of this type and are substantially similar to MPLX’s existing revolving credit facility, including a covenant that requires MPLX’s ratio of Consolidated Total Debt to Consolidated EBITDA (as both terms are defined in the Term Loan Agreement) for the four prior fiscal quarters not to exceed 5.0 to 1.0 as of the last day of each fiscal quarter (or during the six-month period following certain acquisitions, 5.5 to 1.0). Consolidated EBITDA is subject to adjustments for certain acquisitions completed and capital projects undertaken during the relevant period.

MPLX Floating Rate Senior Notes

On September 9, 2019, MPLX issued $2 billion aggregate principal amount of floating rate senior notes in a public offering, consisting of $1 billion aggregate principal amount of notes due September 2021 and $1 billion aggregate principal amount of notes due September 2022. The proceeds were used to repay various outstanding MPLX borrowings and for general business purposes. Interest is payable quarterly in March, June, September and December, commencing on December 9, 2019. The interest rate applicable to the floating rate senior notes due September 2021 is LIBOR plus 0.9% while the interest rate applicable to the floating rate senior notes due September 2022 is LIBOR plus 1.1%.

MPLX Senior Notes

In connection with the merger of MPLX and ANDX, MPLX assumed ANDX’s outstanding senior notes which had an aggregate principal amount of $3.75 billion, with interest rates ranging from 3.5% to 6.375% and maturity dates ranging from 2019 to 2047. On September 23, 2019, approximately $3.06 billion aggregate principal amount of ANDX’s outstanding senior notes were exchanged for new unsecured senior notes issued by MPLX having the same maturity and interest rates as the ANDX senior notes in an exchange offer and consent solicitation undertaken by MPLX, leaving approximately $690 million aggregate principal of outstanding senior notes held by ANDX. Of this, $500 million was related to the 5.5% unsecured senior notes due 2019. The principal amount of $500 million and accrued interest of $14 million was paid on October 15, 2019 and includes interest through the payoff date.

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Leases Components of Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Finance lease cost:
Amortization of right of use assets	$ 17	$ 46
Interest on lease liabilities	12	32
Operating lease cost	209	597
Variable lease cost	23	66
Short-term lease cost	197	511
Total lease cost	$ 458	$ 1,252

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Equity Method Investments

9 Months Ended

Sep. 30, 2019

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

EQUITY METHOD INVESTMENTS

During the three months ended March 31, 2019, we executed agreements with Capline Pipeline Company LLC (“Capline LLC”) to contribute our 33 percent undivided interest in Capline pipeline system in exchange for a 33 percent ownership interest in Capline LLC. In connection with our execution of these agreements, Capline LLC initiated a binding open season for southbound service from Patoka, IL to St. James, LA or Liberty, MS, with an additional origination point at Cushing, OK. Service from Cushing, OK is part of a joint tariff with Diamond pipeline. Crude oil service is expected to begin in the first half of 2021.

In accordance with ASC 810, we derecognized our undivided interest amounting to $143 million of net assets and recognized the Capline LLC ownership interest we received at fair value. We used an income approach to determine the fair value of our ownership interest under a Monte Carlo simulation method. We estimated the fair value of our ownership interest to be $350 million as of January 30, 2019. This is a nonrecurring fair value measurement and is categorized in level 3 of the fair value hierarchy. The Monte Carlo simulation inputs include ranges of tariff rates, operating volumes, operating cost and capital expenditure assumptions. The estimated cash flows were discounted using a Monte Carlo market participant weighted average cost of capital estimate. None of the inputs to the Monte Carlo simulation are individually significant. The excess of the estimated fair value of our ownership interest over the carrying value of the derecognized net assets resulted in a $207 million non-cash net gain recorded as a net gain on disposal of assets in the accompanying consolidated statements of income.

As the Capline system is currently idled, Capline LLC is unable to fund its operations without financial support from its equity owners and is a VIE. MPC is not deemed to be the primary beneficiary, due to our inability to unilaterally control significant decision-making rights. Our maximum exposure to loss as a result of our involvement with Capline LLC includes our equity investment, any additional capital contribution commitments and any operating expenses incurred by Capline LLC in excess of compensation received for performance of the operating services.

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Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Millions		3 Months Ended					9 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				$ (144)		$ (231)	$ (144)	$ (231)
Other comprehensive income (loss), before reclassifications, net of tax							(57)	32
Amounts reclassified from accumulated other comprehensive loss:
Amortization - prior service credit							(34)	(27)
Amortization - actuarial loss							15	25
Amortization - settlement loss							9	47
Other							(4)	(4)
Tax effect							3	(10)
Other comprehensive income (loss)		$ (51)	$ (10)	(7)	$ 65	(2)	(68)	63
Ending balance		(212)			(168)		(212)	(168)
Other comprehensive income (loss) before reclassifications, tax							(20)	10
Accumulated Defined Benefit Plans Adjustment | Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(132)		(190)	(132)	(190)
Other comprehensive income (loss), before reclassifications, net of tax							(58)	35
Amounts reclassified from accumulated other comprehensive loss:
Amortization - prior service credit	[1]						(34)	(25)
Amortization - actuarial loss	[1]						16	26
Amortization - settlement loss	[1]						9	47
Tax effect							2	(12)
Other comprehensive income (loss)							(65)	71
Ending balance		(197)			(119)		(197)	(119)
Accumulated Defined Benefit Plans Adjustment | Other Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				(23)		(48)	(23)	(48)
Other comprehensive income (loss), before reclassifications, net of tax							1	(1)
Amounts reclassified from accumulated other comprehensive loss:
Amortization - prior service credit	[1]						0	(2)
Amortization - actuarial loss	[1]						(1)	(1)
Amortization - settlement loss							0	0
Tax effect							0	1
Other comprehensive income (loss)							0	(3)
Ending balance		(23)			(51)		(23)	(51)
Gain on Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				2		4	2	4
Other comprehensive income (loss), before reclassifications, net of tax							0	(2)
Amounts reclassified from accumulated other comprehensive loss:
Tax effect							0	0
Other comprehensive income (loss)							0	(2)
Ending balance		2			2		2	2
Workers Compensation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance				$ 9		$ 3	9	3
Other comprehensive income (loss), before reclassifications, net of tax							0	0
Amounts reclassified from accumulated other comprehensive loss:
Other							(4)	(4)
Tax effect							1	1
Other comprehensive income (loss)							(3)	(3)
Ending balance		$ 6			$ 0		$ 6	$ 0

[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.

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Revenue (Details) $ in Millions	Sep. 30, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Matching buy/sell receivables	$ 2,250

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Segment Information

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Segment Information

SEGMENT INFORMATION

We have three reportable segments: Refining & Marketing; Retail; 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 16 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, to our Retail business segment and to independent entrepreneurs who operate primarily Marathon^® branded outlets.

• Retail – sells transportation fuels and convenience products in the retail market across the United States through company-owned and operated convenience stores, primarily under the Speedway^® brand, and long-term fuel supply contracts with direct dealers who operate locations primarily 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 from operations attributable to the reportable segments. Corporate administrative expenses, except for those attributable to MPLX, and costs related to certain non-operating assets are not allocated to the Refining & Marketing and Retail segments. In addition, certain items that affect comparability (as determined by the chief operating decision maker) are not allocated to the reportable segments.

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2019
Revenues:
Third party(a)	$	21,437	$	8,677	$	929	$	31,043
Intersegment	5,100		2		1,235		6,337
Segment revenues	$	26,537	$	8,679	$	2,164	$	37,380
Segment income from operations	$	883	$	442	$	919	$	2,244
Supplemental Data
Depreciation and amortization(b)	$	397	$	113	$	300	$	810
Capital expenditures and investments(c)	561		177		783		1,521

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2018
Revenues:
Third party(a)	$	16,751	$	5,395	$	842	$	22,988
Intersegment	2,931		1		787		3,719
Segment revenues	$	19,682	$	5,396	$	1,629	$	26,707
Segment income from operations	$	666	$	161	$	679	$	1,506
Supplemental Data
Depreciation and amortization(b)	$	257	$	76	$	205	$	538
Capital expenditures and investments(c)	226		98		593		917

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2019
Revenues:
Third party(a)	$	65,043	$	24,997	$	2,817	$	92,857
Intersegment	15,011		6		3,685		18,702
Segment revenues	$	80,054	$	25,003	$	6,502	$	111,559
Segment income from operations	$	1,455	$	1,105	$	2,705	$	5,265
Supplemental Data
Depreciation and amortization(b)	$	1,235	$	369	$	925	$	2,529
Capital expenditures and investments(c)	1,385		370		2,420		4,175

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2018
Revenues:
Third party(a)	$	46,635	$	15,231	$	2,305	$	64,171
Intersegment	8,181		4		2,180		10,365
Segment revenues	$	54,816	$	15,235	$	4,485	$	74,536
Segment income from operations	$	1,558	$	415	$	1,863	$	3,836
Supplemental Data
Depreciation and amortization(b)	$	761	$	228	$	577	$	1,566
Capital expenditures and investments(c)	613		225		1,676		2,514

^(a)  Includes related party sales. See Note 6 for additional information.

^(b)  Differences between segment totals and MPC consolidated totals represent amounts related to corporate and other unallocated items and are included in items not allocated to segments in the reconciliation below.

^(c)  Capital expenditures include changes in capital accruals and investments in affiliates. See reconciliation from segment totals to MPC consolidated total capital expenditures below.

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

	Three Months Ended  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Segment income from operations	$	2,244		$	1,506		$	5,265		$	3,836
Items not allocated to segments:
Corporate and other unallocated items(a)	(198		)	(99		)	(568		)	(269		)
Capline restructuring gain(b)	—			—			207			—
Transaction-related costs(c)	(22		)	(4		)	(147		)	(14		)
Litigation	—			—			(22		)	—
Impairments	—			—			—			1
Income from operations	2,024			1,403			4,735			3,554
Net interest and other financial costs	317			240			945			618
Income before income taxes	$	1,707		$	1,163		$	3,790		$	2,936

^(a)  Corporate and other unallocated items 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. Corporate overhead expenses are not allocated to the Refining & Marketing and Retail segments.

^(b)  See Note 13.

^(c)  The transaction-related costs recognized in the 2019 year-to-date period include the recognition of an obligation for employee benefits provided to former Andeavor employees.

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

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions)	2019		2018		2019		2018
Segment capital expenditures and investments	$	1,521	$	917	$	4,175	$	2,514
Less investments in equity method investees	197		104		792		222
Plus items not allocated to segments:
Corporate	30		7		44		42
Capitalized interest	32		21		97		55
Total capital expenditures(a)	$	1,386	$	841	$	3,524	$	2,389

^(a) 

Capital expenditures include changes in capital accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2019 and 2018 as reported in the consolidated statements of cash flows.

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Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 1,525	$ 1,687
Receivables, less allowance for doubtful accounts	7,461	5,853
Inventories	9,696	9,837
Other current assets	457	646
Equity method investments	6,725	5,898
Property, plant and equipment, net	45,034	45,058
Goodwill	21,277	20,184
Right of use assets	2,522	0
Other noncurrent assets	3,442	3,777
Liabilities
Accounts payable	11,380	9,366
Payroll and benefits payable	939	1,152
Accrued taxes	1,015	1,446
Debt due within one year	557	544
Operating lease liabilities	586	0
Other current liabilities	862	708
Long-term debt	28,282	26,980
Long-term operating lease liabilities	1,962	0
Deferred credits and other liabilities	1,265	1,318
Variable Interest Entity, Primary Beneficiary [Member] | MPLX
Assets
Cash and cash equivalents	41	68
Receivables, less allowance for doubtful accounts	592	425
Inventories	104	77
Other current assets	71	45
Equity method investments	5,182	4,174
Property, plant and equipment, net	21,921	14,639
Goodwill	10,735	2,586
Right of use assets	366	0
Other noncurrent assets	1,364	458
Liabilities
Accounts payable	756	776
Payroll and benefits payable	5	2
Accrued taxes	96	48
Debt due within one year	510	1
Operating lease liabilities	61	0
Other current liabilities	276	177
Long-term debt	19,190	13,392
Deferred income taxes	15	13
Long-term operating lease liabilities	309	0
Deferred credits and other liabilities	$ 383	276
Variable Interest Entity, Primary Beneficiary [Member] | ANDX
Assets
Cash and cash equivalents		10
Receivables, less allowance for doubtful accounts		199
Inventories		22
Other current assets		57
Equity method investments		602
Property, plant and equipment, net		6,845
Goodwill		1,051
Right of use assets		0
Other noncurrent assets		1,242
Liabilities
Accounts payable		215
Payroll and benefits payable		10
Accrued taxes		23
Debt due within one year		504
Operating lease liabilities		0
Other current liabilities		77
Long-term debt		4,469
Deferred income taxes		1
Long-term operating lease liabilities		0
Deferred credits and other liabilities		$ 68

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Debt - MPLX Term Loan (Details) - MPLX term loan facility $ in Billions	Sep. 26, 2019 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1
Description of variable rate basis	at either the Adjusted LIBO Rate (as defined in the term loan agreement) plus a margin or the Alternate Base Rate (as defined in the term loan agreement) plus a margin
Maturity date	Sep. 26, 2021
Number of prior quarterly reporting periods covenant	4
Maximum
Debt Instrument [Line Items]
Covenant ratio debt to Ebitda	5.0
Covenant ratio debt to Ebitda post acquisition	5.5

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Debt - Available Capacity under our Facilities (Details) $ in Millions	Sep. 30, 2019 USD ($)
MPC 364-day bank revolving credit facility
Debt Instrument [Line Items]
Total Capacity	$ 1,000
Outstanding Borrowings	0
Outstanding Letters of Credit	0
Available Capacity	$ 1,000
Weighted Average Interest Rate	0.00%
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	$ 750
Outstanding Borrowings	0
Outstanding Letters of Credit	0
Available Capacity	$ 750
Weighted Average Interest Rate	0.00%
MPLX bank revolving credit facility
Debt Instrument [Line Items]
Total Capacity	$ 3,500
Outstanding Borrowings	0
Outstanding Letters of Credit	3
Available Capacity	$ 3,497
Weighted Average Interest Rate	0.00%
MPLX term loan facility
Debt Instrument [Line Items]
Total Capacity	$ 1,000
Outstanding Borrowings	500
Outstanding Letters of Credit	0
Available Capacity	$ 500
Weighted Average Interest Rate	2.795%

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Acquisitions - Pro Forma Information - Andeavor (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Sales and other operating revenues	$ 31,043	$ 22,988	$ 92,857	$ 64,171
Net income attributable to MPC	$ 1,095	737	$ 2,194	1,829
Andeavor
Business Acquisition [Line Items]
Sales and other operating revenues		35,250		99,588
Net income attributable to MPC		$ 1,057		$ 2,562

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Variable Interest Entities (Tables)

9 Months Ended

Sep. 30, 2019

Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]

Schedule of Variable Interest Entities [Table Text Block]

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

	September 30, 2019		December 31, 2018
(In millions)	MPLX		MPLX		ANDX
Assets
Cash and cash equivalents	$	41	$	68	$	10
Receivables, less allowance for doubtful accounts	592		425		199
Inventories	104		77		22
Other current assets	71		45		57
Equity method investments	5,182		4,174		602
Property, plant and equipment, net	21,921		14,639		6,845
Goodwill	10,735		2,586		1,051
Right of use assets	366		—		—
Other noncurrent assets	1,364		458		1,242
Liabilities
Accounts payable	$	756	$	776	$	215
Payroll and benefits payable	5		2		10
Accrued taxes	96		48		23
Debt due within one year	510		1		504
Operating lease liabilities	61		—		—
Other current liabilities	276		177		77
Long-term debt	19,190		13,392		4,469
Deferred income taxes	15		13		1
Long-term operating lease liabilities	309		—		—
Deferred credits and other liabilities	383		276		68

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Income From Operations Attributable To Operating Segments

Segment income represents income from operations attributable to the reportable segments. Corporate administrative expenses, except for those attributable to MPLX, and costs related to certain non-operating assets are not allocated to the Refining & Marketing and Retail segments. In addition, certain items that affect comparability (as determined by the chief operating decision maker) are not allocated to the reportable segments.

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2019
Revenues:
Third party(a)	$	21,437	$	8,677	$	929	$	31,043
Intersegment	5,100		2		1,235		6,337
Segment revenues	$	26,537	$	8,679	$	2,164	$	37,380
Segment income from operations	$	883	$	442	$	919	$	2,244
Supplemental Data
Depreciation and amortization(b)	$	397	$	113	$	300	$	810
Capital expenditures and investments(c)	561		177		783		1,521

(In millions)	Refining & Marketing		Retail		Midstream		Total
Three Months Ended September 30, 2018
Revenues:
Third party(a)	$	16,751	$	5,395	$	842	$	22,988
Intersegment	2,931		1		787		3,719
Segment revenues	$	19,682	$	5,396	$	1,629	$	26,707
Segment income from operations	$	666	$	161	$	679	$	1,506
Supplemental Data
Depreciation and amortization(b)	$	257	$	76	$	205	$	538
Capital expenditures and investments(c)	226		98		593		917

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2019
Revenues:
Third party(a)	$	65,043	$	24,997	$	2,817	$	92,857
Intersegment	15,011		6		3,685		18,702
Segment revenues	$	80,054	$	25,003	$	6,502	$	111,559
Segment income from operations	$	1,455	$	1,105	$	2,705	$	5,265
Supplemental Data
Depreciation and amortization(b)	$	1,235	$	369	$	925	$	2,529
Capital expenditures and investments(c)	1,385		370		2,420		4,175

(In millions)	Refining & Marketing		Retail		Midstream		Total
Nine Months Ended September 30, 2018
Revenues:
Third party(a)	$	46,635	$	15,231	$	2,305	$	64,171
Intersegment	8,181		4		2,180		10,365
Segment revenues	$	54,816	$	15,235	$	4,485	$	74,536
Segment income from operations	$	1,558	$	415	$	1,863	$	3,836
Supplemental Data
Depreciation and amortization(b)	$	761	$	228	$	577	$	1,566
Capital expenditures and investments(c)	613		225		1,676		2,514

^(a)  Includes related party sales. See Note 6 for additional information.

^(b)  Differences between segment totals and MPC consolidated totals represent amounts related to corporate and other unallocated items and are included in items not allocated to segments in the reconciliation below.

^(c) 

Capital expenditures include changes in capital accruals and investments in affiliates. See reconciliation from segment totals to MPC consolidated total capital expenditures below.

Reconciliation Of Segment Income From Operations To Income Before Income Taxes

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

	Three Months Ended  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Segment income from operations	$	2,244		$	1,506		$	5,265		$	3,836
Items not allocated to segments:
Corporate and other unallocated items(a)	(198		)	(99		)	(568		)	(269		)
Capline restructuring gain(b)	—			—			207			—
Transaction-related costs(c)	(22		)	(4		)	(147		)	(14		)
Litigation	—			—			(22		)	—
Impairments	—			—			—			1
Income from operations	2,024			1,403			4,735			3,554
Net interest and other financial costs	317			240			945			618
Income before income taxes	$	1,707		$	1,163		$	3,790		$	2,936

^(a)  Corporate and other unallocated items 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. Corporate overhead expenses are not allocated to the Refining & Marketing and Retail segments.

^(b)  See Note 13.

^(c)  The transaction-related costs recognized in the 2019 year-to-date period include the recognition of an obligation for employee benefits provided to former Andeavor employees.

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  September 30,				Nine Months Ended  September 30,
(In millions)	2019		2018		2019		2018
Segment capital expenditures and investments	$	1,521	$	917	$	4,175	$	2,514
Less investments in equity method investees	197		104		792		222
Plus items not allocated to segments:
Corporate	30		7		44		42
Capitalized interest	32		21		97		55
Total capital expenditures(a)	$	1,386	$	841	$	3,524	$	2,389

^(a) 

Capital expenditures include changes in capital accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2019 and 2018 as reported in the consolidated statements of cash flows.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

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 September 30, 2019 and December 31, 2018 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.

 

	September 30, 2019
	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	$	176	$	9	$	—	$	(161	)	$	24	$	77
Liabilities:
Commodity contracts	$	165	$	12	$	—	$	(176	)	$	1	$	—
Embedded derivatives in commodity contracts	—		—		54		—			54		—

	December 31, 2018
	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	$	370	$	31	$	—	$	(323	)	$	78	$	2
Liabilities:
Commodity contracts	$	255	$	37	$	—	$	(284	)	$	8	$	—
Embedded derivatives in commodity contracts	—		—		61		—			61		—

^(a)  Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of September 30, 2019, cash collateral of $15 million was netted with the mark-to-market derivative liabilities. As of December 31, 2018, cash collateral of $52 million was netted with mark-to-market derivative assets and $13 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  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Beginning balance	$	65		$	68		$	61		$	66
Unrealized and realized losses included in net income	(9		)	20			(2		)	29
Settlements of derivative instruments	(2		)	(4		)	(5		)	(11		)
Ending balance	$	54		$	84		$	54		$	84
The amount of total losses for the period included in earnings attributable to the change in unrealized losses relating to assets still held at the end of period:	$	(9	)	$	21		$	(5	)	$	22

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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		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Additions to property, plant and equipment per the consolidated statements of cash flows				$ 3,823	$ 2,315
Asset retirement expenditures				1	7
Increase (decrease) in capital accruals				(300)	67
Capital expenditures	[1]	$ 1,386	$ 841	$ 3,524	$ 2,389

[1] Capital expenditures include changes in capital accruals. See Note 19 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2019 and 2018 as reported in the consolidated statements of cash flows.

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Inventories

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

(In millions)	September 30, 2019		December 31, 2018
Crude oil and refinery feedstocks	$	3,415	$	3,655
Refined products	5,152		5,234
Materials and supplies	907		720
Merchandise	222		228
Total	$	9,696	$	9,837

Inventories are carried at the lower of cost or market value. The cost of inventories of crude oil and refinery feedstocks, refined products and merchandise is determined primarily under the LIFO method. There were no LIFO inventory liquidations recognized for the nine months ended September 30, 2019.

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Equity

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Equity

EQUITY

As of September 30, 2019, we had $3.02 billion of remaining share repurchase authorizations from our board of directors. We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, 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.

Total share repurchases were as follows for the respective periods:

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions, except per share data)	2019		2018		2019		2018
Number of shares repurchased	10		5		33		36
Cash paid for shares repurchased	$	500	$	400	$	1,885	$	2,612
Average cost per share	$	53.82	$	73.03	$	58.75	$	71.80

As of September 30, 2019, we had agreements to acquire 97,078 common shares for $6 million, which settled in early October 2019.

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Revenue - Disaggregated by Product Line (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Sales and other operating revenues	$ 31,043	$ 22,988	$ 92,857	$ 64,171
Refined products
Sales and other operating revenues	27,462	19,925	81,762	55,604
Merchandise
Sales and other operating revenues	1,698	1,340	4,722	3,756
Crude oil and refinery feedstocks
Sales and other operating revenues	986	1,069	3,827	3,025
Midstream services and other
Sales and other operating revenues	897	654	2,546	1,786
Refining & Marketing
Sales and other operating revenues	21,437	16,751	65,043	46,635
Refining & Marketing | Refined products
Sales and other operating revenues	20,330	15,636	60,963	43,493
Refining & Marketing | Merchandise
Sales and other operating revenues	1	1	3	3
Refining & Marketing | Crude oil and refinery feedstocks
Sales and other operating revenues	945	1,009	3,682	2,871
Refining & Marketing | Midstream services and other
Sales and other operating revenues	161	105	395	268
Retail
Sales and other operating revenues	8,677	5,395	24,997	15,231
Retail | Refined products
Sales and other operating revenues	6,956	4,051	20,206	11,462
Retail | Merchandise
Sales and other operating revenues	1,697	1,339	4,719	3,753
Retail | Crude oil and refinery feedstocks
Sales and other operating revenues	0	0	0	0
Retail | Midstream services and other
Sales and other operating revenues	24	5	72	16
Midstream
Sales and other operating revenues	929	842	2,817	2,305
Midstream | Refined products
Sales and other operating revenues	176	238	593	649
Midstream | Merchandise
Sales and other operating revenues	0	0	0	0
Midstream | Crude oil and refinery feedstocks
Sales and other operating revenues	41	60	145	154
Midstream | Midstream services and other
Sales and other operating revenues	$ 712	$ 544	$ 2,079	$ 1,502

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Leases Lessee Narrative (Details)	9 Months Ended
	Sep. 30, 2019
Minimum
Term of agreements	1 year
Renewal term options	1 year
Maximum
Term of agreements	60 years
Renewal term options	50 years

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Derivatives

9 Months Ended

Sep. 30, 2019

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 15. 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 and (6) the purchase of natural gas.

The following table presents the fair value of derivative instruments as of September 30, 2019 and December 31, 2018 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)	September 30, 2019
Balance Sheet Location	Asset		Liability
Commodity derivatives
Other current assets	$	184	$	176
Other current liabilities(a)	1		6
Deferred credits and other liabilities(a)	—		49

(In millions)	December 31, 2018
Balance Sheet Location	Asset		Liability
Commodity derivatives
Other current assets	$	400	$	283
Other current liabilities(a)	1		16
Deferred credits and other liabilities(a)	—		54

^(a)   Includes embedded derivatives.

The table below summarizes open commodity derivative contracts for crude oil, refined products and blending products as of September 30, 2019. 

	Percentage of contracts that expire next quarter	Position
(Units in thousands of barrels)		Long	Short
Exchange-traded(a)
Crude oil	92.1%	35,825	40,897
Refined products	97.1%	17,014	11,258
Blending products	84.2%	2,750	7,708
OTC
Crude oil	100.0%	160	—
Blending products	100.0%	313	313

^(a)  Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 6,520 long and 1,500 short; Refined products - 925 long and 225 short; Blending products - 257 long and 182 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 September 30,						Nine Months Ended  September 30,
Income Statement Location	2019			2018			2019			2018
Sales and other operating revenues	$	(1	)	$	3		$	(18	)	$	1
Cost of revenues	50			(69		)	(15		)	(152		)
Total	$	49		$	(66	)	$	(33	)	$	(151	)

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Acquisitions - Acquisition of Mt. Airy Terminal (Details) bbl / d in Thousands, bbl in Millions, $ in Millions	Sep. 26, 2018 USD ($) bbl / d bbl	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill		$ 21,277	$ 20,184
Mt. Airy Terminal
Storage capacity | bbl	4
Barrels handled | bbl / d	120
Mt. Airy Terminal | MPLX
Cash consideration	$ 446
Property, plant and equipment, net	336
Goodwill	121
Mt. Airy Terminal | As originally reported | MPLX
Cash consideration	451
Mt. Airy Terminal | Adjustments | MPLX
Cash consideration	$ 5

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Debt - MPLX Credit Agreement (Details) $ in Billions	Jul. 30, 2019 USD ($)
MPLX revolving credit facility due July 2024
Debt Instrument [Line Items]
Current borrowing capacity	$ 3.5

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Debt - Outstanding Borrowings (Detail) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Total debt		$ 29,294	$ 27,980
Unamortized debt issuance costs		(137)	(128)
Unamortized discount		(318)	(328)
Amounts due within one year		(557)	(544)
Total long-term debt due after one year		28,282	26,980
Marathon Petroleum Corporation
Total debt		9,174	9,114
MPLX LP
Total debt		20,120	13,856
ANDX
Total debt	[1]	$ 0	5,010
Capital lease obligations			15
ANDX | Senior notes
Long-term debt, gross			3,750
ANDX | ANDX revolver
Long-term debt, gross			$ 1,245

[1] On July 30, 2019, MPLX acquired ANDX and assumed its debt obligations. See Note 3 and the discussion below for additional information. The ANDX December 31, 2018 balance includes senior notes of $3,750 million, borrowings under the revolving and dropdown credit facilities of $1,245 million and capital leases of $15 million.

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Acquisitions - Schedule of Assets Acquired and Liabilities Assumed - Andeavor (Details) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018	Oct. 01, 2018
Business Acquisition [Line Items]
Goodwill		$ 21,277	$ 20,184
Andeavor
Business Acquisition [Line Items]
Cash and cash equivalents				$ 382
Receivables				2,737
Inventories				5,241
Other current assets				372
Equity method investments				752
Property, plant and equipment, net				15,486
Other noncurrent assets	[1]			3,075
Total assets acquired				28,045
Accounts payable				3,962
Payroll and benefits payable				357
Accrued taxes				480
Debt due within one year				34
Other current liabilities				419
Long-term debt				8,876
Deferred income taxes				1,549
Defined benefit postretirement plan obligations				432
Deferred credit and other liabilities				747
Noncontrolling interests				5,062
Total liabilities and noncontrolling interest assumed				21,918
Net assets acquired excluding goodwill				6,127
Goodwill				17,335
Net assets acquired				23,462
Andeavor | As originally reported
Business Acquisition [Line Items]
Cash and cash equivalents				382
Receivables				2,744
Inventories				5,204
Other current assets				378
Equity method investments				865
Property, plant and equipment, net				16,545
Other noncurrent assets	[1]			3,086
Total assets acquired				29,204
Accounts payable				4,003
Payroll and benefits payable				348
Accrued taxes				590
Debt due within one year				34
Other current liabilities				392
Long-term debt				8,875
Deferred income taxes				1,609
Defined benefit postretirement plan obligations				432
Deferred credit and other liabilities				714
Noncontrolling interests				5,059
Total liabilities and noncontrolling interest assumed				22,056
Net assets acquired excluding goodwill				7,148
Goodwill				16,314
Net assets acquired				23,462
Andeavor | Adjustments
Business Acquisition [Line Items]
Cash and cash equivalents				0
Receivables				(7)
Inventories				37
Other current assets				(6)
Equity method investments				(113)
Property, plant and equipment, net				(1,059)
Other noncurrent assets	[1]			(11)
Total assets acquired				(1,159)
Accounts payable				(41)
Payroll and benefits payable				9
Accrued taxes				(110)
Debt due within one year
Other current liabilities				27
Long-term debt				1
Deferred income taxes				(60)
Defined benefit postretirement plan obligations				0
Deferred credit and other liabilities				33
Noncontrolling interests				3
Total liabilities and noncontrolling interest assumed				(138)
Net assets acquired excluding goodwill				(1,021)
Goodwill		$ 32		1,021
Net assets acquired				$ 0

[1] Includes intangible assets

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Derivatives (Tables)

9 Months Ended

Sep. 30, 2019

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 September 30, 2019 and December 31, 2018 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)	September 30, 2019
Balance Sheet Location	Asset		Liability
Commodity derivatives
Other current assets	$	184	$	176
Other current liabilities(a)	1		6
Deferred credits and other liabilities(a)	—		49

(In millions)	December 31, 2018
Balance Sheet Location	Asset		Liability
Commodity derivatives
Other current assets	$	400	$	283
Other current liabilities(a)	1		16
Deferred credits and other liabilities(a)	—		54

^(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 September 30, 2019. 

	Percentage of contracts that expire next quarter	Position
(Units in thousands of barrels)		Long	Short
Exchange-traded(a)
Crude oil	92.1%	35,825	40,897
Refined products	97.1%	17,014	11,258
Blending products	84.2%	2,750	7,708
OTC
Crude oil	100.0%	160	—
Blending products	100.0%	313	313

^(a) 

Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 6,520 long and 1,500 short; Refined products - 925 long and 225 short; Blending products - 257 long and 182 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 September 30,						Nine Months Ended  September 30,
Income Statement Location	2019			2018			2019			2018
Sales and other operating revenues	$	(1	)	$	3		$	(18	)	$	1
Cost of revenues	50			(69		)	(15		)	(152		)
Total	$	49		$	(66	)	$	(33	)	$	(151	)

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Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2019

Related Party Transactions [Abstract]

Sales to Related Parties

Transactions with related parties were as follows:

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions)	2019		2018		2019		2018
Sales to related parties(a)	$	186	$	201	$	558	$	572
Purchases from related parties(b)	184		149		571		428

^(a)   Sales to related parties, which are included in sales and other operating revenues, consist primarily of sales of refined products to PFJ Southeast, an equity affiliate which owns and operates travel plazas primarily in the Southeast region of the United States.

^(b)  

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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Net Interest and Other Financial Costs (Tables)

9 Months Ended

Sep. 30, 2019

Other Income and Expenses [Abstract]

Net Interest And Other Financial Income (Costs)

Net interest and other financial costs were as follows:

	Three Months Ended  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Interest income	$	(12	)	$	(26	)	$	(30	)	$	(71	)
Interest expense	352			233			1,042			675
Interest capitalized	(45		)	(21		)	(112		)	(55		)
Pension and other postretirement non-service costs(a)	6			45			6			47
Loss on extinguishment of debt	—			—			—			4
Other financial costs	16			9			39			18
Net interest and other financial costs	$	317		$	240		$	945		$	618

^(a) 

See Note 21.

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Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019 refinery Segment
Segment Reporting [Abstract]
Number of reportable segments | Segment	3
Number of refineries | refinery	16

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Property, Plant And Equipment - Summary Of Property, Plant And Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 63,290	$ 61,213
Less accumulated depreciation	18,256	16,155
Property, plant and equipment, net	45,034	45,058
Operating Segments | Refining & Marketing
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28,470	27,590
Operating Segments | Retail
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,939	6,637
Operating Segments | Midstream
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,652	25,692
Corporate and Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,229	$ 1,294

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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
The amount of total losses for the period included in earnings attributable to the change in unrealized losses relating to assets still held at the end of period:	$ (9)	$ 21	$ (5)	$ 22

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Net Interest And Other Financial Costs (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income and Expenses [Abstract]
Interest income		$ (12)	$ (26)	$ (30)	$ (71)
Interest expense		352	233	1,042	675
Interest capitalized		(45)	(21)	(112)	(55)
Pension and other postretirement non-service costs	[1]	6	45	6	47
Loss on extinguishment of debt		0	0	0	4
Other financial costs		16	9	39	18
Net interest and other financial costs		$ 317	$ 240	$ 945	$ 618

[1] See Note 21.

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Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Costs

The following summarizes the components of net periodic benefit costs:

	Three Months Ended September 30, 2019
	Pension Benefits						Other Benefits
(In millions)	2019			2018			2019		2018
Components of net periodic benefit cost:
Service cost	$	57		$	36		$	8	$	7
Interest cost	27			18			9		7
Expected return on plan assets	(31		)	(25		)	—		—
Amortization – prior service credit	(11		)	(9		)	—		—
– actuarial loss	5			9			—		(1		)
– settlement loss	7			45			—		—
Net periodic benefit cost	$	54		$	74		$	17	$	13

	Nine Months Ended September 30,
	Pension Benefits						Other Benefits
(In millions)	2019			2018			2019			2018
Components of net periodic benefit cost:
Service cost	$	175		$	107		$	24		$	22
Interest cost	82			54			28			22
Expected return on plan assets	(94		)	(75		)	—			—
Amortization – prior service credit	(34		)	(25		)	—			(2		)
– actuarial loss	16			26			(1		)	(1		)
– settlement loss	9			47			—			—
Net periodic benefit cost	$	154		$	134		$	51		$	41

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Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Outstanding Borrowings

Our outstanding borrowings at September 30, 2019 and December 31, 2018 consisted of the following:

(In millions)	September 30, 2019			December 31, 2018
Marathon Petroleum Corporation	$	9,174		$	9,114
MPLX LP	20,120			13,856
ANDX(a)	—			5,010
Total debt	$	29,294		$	27,980
Unamortized debt issuance costs	(137		)	(128		)
Unamortized discount	(318		)	(328		)
Amounts due within one year	(557		)	(544		)
Total long-term debt due after one year	$	28,282		$	26,980

Schedule of Line of Credit Facilities [Table Text Block]

Available Capacity under our Facilities

(Dollars in millions)	Total Capacity		Outstanding Borrowings		Outstanding Letters of Credit		Available Capacity		Weighted Average Interest Rate		Expiration
MPC 364-day bank revolving credit facility	$	1,000	$	—	$	—	$	1,000	—		September 2020
MPC bank revolving credit facility	5,000		—		1		4,999		—		October 2023
MPC trade receivables securitization facility	750		—		—		750		—		July 2021
MPLX bank revolving credit facility	3,500		—		3		3,497		—		July 2024
MPLX term loan facility	1,000		500		—		500		2.795	%	September 2021

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Master Limited Partnership (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended						9 Months Ended
	Jul. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity transactions of MPLX & ANDX		$ (596)	$ 1	$ 2	$ 0	$ 0	$ (546)
Preferred Partner | Preferred Class B
Distribution declared, per unit	$ 68.75
Additional Paid-in Capital
Equity transactions of MPLX & ANDX	$ (55)	$ (691)	$ 2	$ 3	$ 1	$ 1	$ 2,380	$ (686)	$ 2,382
Deferred income tax impact from changes in equity	$ (642)							$ (634)	$ (546)
Public
Common units conversion ratio	1.135
Nonpublic
Common units conversion ratio	1.0328
MPLX
MPC's partnership interest in MLP (in percentage)		63.00%						63.00%
MPLX | Series B Preferred Stock
Preferred units, outstanding	600,000
ANDX
Preferred units, outstanding	600,000

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Document And Entity Information [Abstract]
Entity Central Index Key	0001510295
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q3
Amendment Flag	false
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
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		649,321,709

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Commitments and Contingencies - Contractual Commitments and Contingencies (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Contractual commitments to acquire property, plant and equipment and advance funds to equity method investees	$ 1,550

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Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,525	$ 1,687
Receivables, less allowance for doubtful accounts of $21 and $9, respectively	7,461	5,853
Inventories	9,696	9,837
Other current assets	457	646
Total current assets	19,139	18,023
Equity method investments	6,725	5,898
Property, plant and equipment, net	45,034	45,058
Goodwill	21,277	20,184
Right of use assets	2,522	0
Other noncurrent assets	3,442	3,777
Total assets	98,139	92,940
Current liabilities:
Accounts payable	11,380	9,366
Payroll and benefits payable	939	1,152
Accrued taxes	1,015	1,446
Debt due within one year	557	544
Operating lease liabilities	586	0
Other current liabilities	862	708
Total current liabilities	15,339	13,216
Long-term debt	28,282	26,980
Deferred income taxes	6,180	4,864
Defined benefit postretirement plan obligations	1,487	1,509
Long-term operating lease liabilities	1,962	0
Deferred credits and other liabilities	1,265	1,318
Total liabilities	54,515	47,887
Commitments and contingencies (see Note 23)
Redeemable noncontrolling interest	968	1,004
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 – 978 million and 975 million shares (par value $0.01 per share, 2 billion shares authorized)	10	10
Held in treasury, at cost – 328 million and 295 million shares	(15,076)	(13,175)
Additional paid-in capital	33,125	33,729
Retained earnings	15,891	14,755
Accumulated other comprehensive loss	(212)	(144)
Total MPC stockholders’ equity	33,738	35,175
Noncontrolling interests	8,918	8,874
Total equity	42,656	44,049
Total liabilities, redeemable noncontrolling interest and equity	$ 98,139	$ 92,940

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Acquisitions (Tables)

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The fair value estimates of assets acquired and liabilities assumed as of the acquisition date are noted in the table below.

(In millions)	As originally reported		Adjustments			As adjusted
Cash and cash equivalents	$	382	$	—		$	382
Receivables	2,744		(7		)	2,737
Inventories	5,204		37			5,241
Other current assets	378		(6		)	372
Equity method investments	865		(113		)	752
Property, plant and equipment, net	16,545		(1,059		)	15,486
Other noncurrent assets(a)	3,086		(11		)	3,075
Total assets acquired	29,204		(1,159		)	28,045
Accounts payable	4,003		(41		)	3,962
Payroll and benefits payable	348		9			357
Accrued taxes	590		(110		)	480
Debt due within one year	34					34
Other current liabilities	392		27			419
Long-term debt	8,875		1			8,876
Deferred income taxes	1,609		(60		)	1,549
Defined benefit postretirement plan obligations	432		—			432
Deferred credit and other liabilities	714		33			747
Noncontrolling interests	5,059		3			5,062
Total liabilities and noncontrolling interest assumed	22,056		(138		)	21,918
Net assets acquired excluding goodwill	7,148		(1,021		)	6,127
Goodwill	16,314		1,021			17,335
Net assets acquired	$	23,462	$	—		$	23,462

^(a) 

Includes intangible assets.

Business Acquisition, Pro Forma Information [Table Text Block]

The following unaudited pro forma financial information presents consolidated results assuming the Andeavor acquisition occurred on January 1, 2017. The unaudited pro forma information does not give effect to potential synergies that could result from the transaction and is not necessarily indicative of the results of future operations.

	Three Months Ended  September 30,		Nine Months Ended  September 30,
(In millions)	2018		2018
Sales and other operating revenues	$	35,250	$	99,588
Net income attributable to MPC	1,057		2,562

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Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

SUPPLEMENTAL CASH FLOW INFORMATION

	Nine Months Ended  September 30,
(In millions)	2019		2018
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$	871	$	520
Net income taxes paid to taxing authorities	376		153
Cash paid for amounts included in the measurement of lease liabilities
Payments on operating leases(a)	572		—
Interest payments under finance lease obligations(a)	25		—
Net cash provided by financing activities included:
Principal payments under finance lease obligations(a)	35		—
Non-cash investing and financing activities:
Capital leases	—		171
Right of use assets obtained in exchange for new operating lease obligations(a)	235		—
Right of use assets obtained in exchange for new finance lease obligations(a)	87		—
Contribution of net assets to Capline LLC(b)	143		—
Recognition of Capline LLC equity method investment(b)	350		—

^(a)  Disclosure added in 2019 following the adoption of ASC 842.

^(b)   See Note 13.

(In millions)	September 30, 2019		December 31, 2018
Cash and cash equivalents	$	1,525	$	1,687
Restricted cash(a)	3		38
Cash, cash equivalents and restricted cash	$	1,528	$	1,725

^(a)  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:

	Nine Months Ended  September 30,
(In millions)	2019			2018
Additions to property, plant and equipment per the consolidated statements of cash flows	$	3,823		$	2,315
Asset retirement expenditures	1			7
Increase (decrease) in capital accruals	(300		)	67
Total capital expenditures	$	3,524		$	2,389

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Leases Schedule of Minimum Lease Payments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Operating leases
2019	$ 174	$ 709
2020	665	619
2021	572	553
2022	388	389
2023	277	295
2024 and thereafter	855	858
Gross lease payments	2,931	3,423
Less: imputed interest	383
Total operating lease liabilities	2,548
Finance leases
2019	29	70
2020	94	71
2021	86	66
2022	94	75
2023	96	82
2024 and thereafter	611	586
Gross lease payments	1,010	950
Less: imputed interest	301	301
Total finance lease liabilities	$ 709	$ 649

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Consolidated Statement of Equity - Shares of Common Stock - shares shares in Millions	Total	Common Stock
Beginning balance at Dec. 31, 2017		734
Number of common shares issued - stock compensation		0
Ending balance at Mar. 31, 2018		734
Number of common shares issued - stock compensation		1
Ending balance at Jun. 30, 2018		735
Number of common shares issued - stock compensation		0
Ending balance at Sep. 30, 2018		735
Beginning balance at Dec. 31, 2018	975	975
Number of common shares issued - stock compensation		1
Ending balance at Mar. 31, 2019		976
Number of common shares issued - stock compensation		2
Ending balance at Jun. 30, 2019		978
Number of common shares issued - stock compensation		0
Ending balance at Sep. 30, 2019	978	978

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Commitments and Contingencies (Detail)	9 Months Ended
	Sep. 30, 2019
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

9 Months Ended

Sep. 30, 2019

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 September 30, 2019 and December 31, 2018, accrued liabilities for remediation totaled $447 million and $455 million, respectively. It is not presently possible to estimate the ultimate amount of all remediation costs that might be incurred or the penalties, if any, that may be imposed. Receivables for recoverable costs from certain states, under programs to assist companies in clean-up efforts related to underground storage tanks at presently or formerly owned or operated retail marketing sites, were $30 million and $35 million at September 30, 2019 and December 31, 2018, respectively.

Governmental and other entities in California, New York, Maryland and Rhode Island have filed lawsuits against coal, gas, oil and petroleum companies, including the Company. The lawsuits allege damages as a result of climate change and the plaintiffs are seeking unspecified damages and abatement under various tort theories. Similar lawsuits may be filed in other jurisdictions. At this early stage, the ultimate outcome of these matters remains uncertain, and neither the likelihood of an unfavorable outcome nor the ultimate liability, if any, can be determined.

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

Other Lawsuits

In May 2015, the Kentucky attorney general filed a lawsuit against our wholly-owned subsidiary, Marathon Petroleum Company LP (“MPC LP”), in the United States District Court for the Western District of Kentucky asserting claims under

federal and state antitrust statutes, the Kentucky Consumer Protection Act, and state common law. The complaint, as amended in July 2015, alleges that MPC LP used deed restrictions, supply agreements with customers and exchange agreements with competitors to unreasonably restrain trade in areas within Kentucky and seeks declaratory relief, unspecified damages, civil penalties, restitution and disgorgement of profits. At this stage, the ultimate outcome of this litigation remains uncertain, and neither the likelihood of an unfavorable outcome nor the ultimate liability, if any, can be determined, and we are unable to estimate a reasonably possible loss (or range of loss) for this matter. We intend to vigorously defend ourselves in this matter.

In May 2007, the Kentucky attorney general filed a lawsuit against us and Marathon Oil in state court in Franklin County, Kentucky for alleged violations of Kentucky’s emergency pricing and consumer protection laws following Hurricanes Katrina and Rita in 2005. The lawsuit alleged that we overcharged customers by $89 million during September and October 2005. The complaint sought disgorgement of these sums, as well as penalties, under Kentucky’s emergency pricing and consumer protection laws. In May 2011, the Kentucky attorney general amended his complaint to include a request for immediate injunctive relief as well as unspecified damages and penalties related to our wholesale gasoline pricing in April and May 2011 under statewide price controls that were activated by the Kentucky governor on April 26, 2011 and which have since expired. The court denied the attorney general’s request for immediate injunctive relief. In July 2019, MPC and the attorney general reached a settlement to resolve this litigation. This resolution did not 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—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 vary but tend to follow the terms of the underlying debt, which extend through 2037. Our maximum potential undiscounted payments under these agreements for the debt principal totaled $171 million as of September 30, 2019.

In connection with our 25 percent interest in Gray Oak Pipeline, LLC (“Gray Oak Pipeline”), we have entered into an Equity Contribution Agreement obligating us to make certain equity contributions to Gray Oak Pipeline to support its obligations under a construction loan facility. Gray Oak Pipeline is constructing the Gray Oak oil pipeline, a crude oil transportation system from West Texas and the Eagle Ford formation to destinations in the Ingleside, Corpus Christi and Sweeney, Texas markets. Gray Oak Pipeline has entered into the construction loan facility with a syndicate of banks to finance a portion of the construction costs of the pipeline project.

The Equity Contribution Agreement requires us to contribute our pro rata share of any amounts necessary to allow Gray Oak Pipeline to cure any payment defaults under the construction loan facility or to repay all amounts outstanding under the facility, including principal, accrued interest, fees and expenses, in certain circumstances, including the abandonment of the Gray Oak pipeline project prior to completion or the failure of Gray Oak Pipeline to repay or refinance the construction loan facility prior to its scheduled maturity date of June 3, 2022. Gray Oak may borrow up to $1.43 billion under the construction loan facility (after giving effect to the exercise of all options to increase its borrowing capacity). As of September 30, 2019, our maximum potential undiscounted payments under the Equity Contribution Agreement for the debt principal totaled $226 million.

In connection with MPLX’s approximate nine percent indirect interest in a joint venture that owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects, collectively referred to as the Bakken Pipeline system, MPLX has entered into a Contingent Equity Contribution Agreement. MPLX, along with the other joint venture owners in the Bakken Pipeline system, have 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. As of September 30, 2019, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement was approximately $230 million.

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 September 30, 2019, our maximum potential undiscounted payments under this agreement for debt principal totaled $125 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 September 30, 2019, our maximum potential undiscounted payments under this arrangement was $122 million.

Marathon Oil indemnifications—In conjunction with our spinoff from Marathon Oil, we have entered into arrangements with Marathon Oil providing indemnities and guarantees with recorded values of $1 million as of September 30, 2019, which consist of unrecognized tax benefits related to MPC, its consolidated subsidiaries and the refining, marketing and transportation business operations prior to our spinoff which are not already reflected in the unrecognized tax benefits described in Note 11, and other contingent liabilities Marathon Oil may incur related to taxes. Furthermore, the separation and distribution agreement and other agreements with Marathon Oil to effect our spinoff provide for cross-indemnities between Marathon Oil and us. In general, Marathon Oil is required to indemnify us for any liabilities relating to Marathon Oil’s historical oil and gas exploration and production operations, oil sands mining operations and integrated gas operations, and we are required to indemnify Marathon Oil for any liabilities relating to Marathon Oil’s historical refining, marketing and transportation operations. The terms of these indemnifications are indefinite and the amounts are not capped.

Other guarantees—We have entered into other guarantees with maximum potential undiscounted payments totaling $122 million as of September 30, 2019, 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.

General guarantees associated with dispositions—Over the years, we have sold various assets in the normal course of our business. Certain of the related agreements contain performance and general guarantees, including guarantees regarding inaccuracies in representations, warranties, covenants and agreements, and environmental and general indemnifications that require us to perform upon the occurrence of a triggering event or condition. These guarantees and indemnifications are part of the normal course of selling assets. We are typically not able to calculate the maximum potential amount of future payments that could be made under such contractual provisions because of the variability inherent in the guarantees and indemnities. Most often, the nature of the guarantees and indemnities is such that there is no appropriate method for quantifying the exposure because the underlying triggering event has little or no past experience upon which a reasonable prediction of the outcome can be based.

Contractual Commitments and Contingencies

At September 30, 2019, our contractual commitments to acquire property, plant and equipment and advance funds to equity method investees totaled $1.55 billion.

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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Acquisitions

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Acquisitions

ACQUISITIONS

Acquisition of Andeavor

On October 1, 2018, we acquired Andeavor. The total value of consideration transferred was $23.46 billion, consisting of $19.97 billion in equity and $3.49 billion in cash. The cash portion of the purchase price was funded using cash on hand. Our financial results reflect the results of Andeavor from the date of the acquisition.

We accounted for the Andeavor acquisition using the acquisition method of accounting, which requires Andeavor assets and liabilities to be recorded to our balance sheet at fair value as of the acquisition date. The size and the breadth of the Andeavor acquisition necessitated the use of the one year measurement period provided under ASC 805 to fully analyze all the factors used in establishing the asset and liability fair values as of the acquisition date. We completed a final determination of the fair value of certain assets and liabilities during the three months ended September 30, 2019 and recorded adjustments to our preliminary purchase price allocation. These adjustments reflect the completion of valuation studies of the acquired property, plant and equipment in order to finalize assumptions used in their cost approach valuation methodology and finalization of specific valuation assumptions and data inputs for other individual asset valuation models. The fair value estimates of assets acquired and liabilities assumed as of the acquisition date are noted in the table below.

(In millions)	As originally reported		Adjustments			As adjusted
Cash and cash equivalents	$	382	$	—		$	382
Receivables	2,744		(7		)	2,737
Inventories	5,204		37			5,241
Other current assets	378		(6		)	372
Equity method investments	865		(113		)	752
Property, plant and equipment, net	16,545		(1,059		)	15,486
Other noncurrent assets(a)	3,086		(11		)	3,075
Total assets acquired	29,204		(1,159		)	28,045
Accounts payable	4,003		(41		)	3,962
Payroll and benefits payable	348		9			357
Accrued taxes	590		(110		)	480
Debt due within one year	34					34
Other current liabilities	392		27			419
Long-term debt	8,875		1			8,876
Deferred income taxes	1,609		(60		)	1,549
Defined benefit postretirement plan obligations	432		—			432
Deferred credit and other liabilities	714		33			747
Noncontrolling interests	5,059		3			5,062
Total liabilities and noncontrolling interest assumed	22,056		(138		)	21,918
Net assets acquired excluding goodwill	7,148		(1,021		)	6,127
Goodwill	16,314		1,021			17,335
Net assets acquired	$	23,462	$	—		$	23,462

^(a)  Includes intangible assets.

The purchase consideration allocation resulted in the recognition of $17.3 billion in goodwill, of which $1.0 billion is tax deductible due to a carryover basis from Andeavor. Our Refining & Marketing, Midstream and Retail segments recognized $5.2 billion, $8.1 billion and $4.0 billion of goodwill, respectively. The recognized goodwill represents the value expected to be created by further optimization of crude supply, a nationwide retail and marketing platform, diversification of our refining and midstream footprints and optimization of information systems and business processes.

Pro Forma Financial Information

The following unaudited pro forma financial information presents consolidated results assuming the Andeavor acquisition occurred on January 1, 2017. The unaudited pro forma information does not give effect to potential synergies that could result from the transaction and is not necessarily indicative of the results of future operations.

	Three Months Ended  September 30,		Nine Months Ended  September 30,
(In millions)	2018		2018
Sales and other operating revenues	$	35,250	$	99,588
Net income attributable to MPC	1,057		2,562

The pro forma information includes adjustments to align accounting policies, including our policy to expense refinery turnarounds when they occur, an adjustment to depreciation expense to reflect the increased fair value of property, plant and equipment, increased amortization expense related to identifiable intangible assets and the related income tax effects.

Acquisition of Terminal and Retail Locations in Buffalo, New York

During the third quarter of 2019, we acquired a 900,000-barrel capacity light product and asphalt terminal and 33 NOCO Express retail stores in Buffalo, Syracuse and Rochester, New York, from NOCO Incorporated for total consideration of $135 million.

Based on the final fair value estimates of assets acquired and liabilities assumed at the acquisition date, $38 million of the purchase price was allocated to property, plant and equipment, $3 million to inventory and $94 million to goodwill. Goodwill is tax deductible and represents the value expected to be created by geographically expanding our retail platform and the assembled workforce. The terminal is accounted for within the R&M segment and the retail stores are accounted for within the Retail segment.

Acquisition of Express Mart

During the fourth quarter of 2018, Speedway acquired 78 transportation fuel and convenience store locations from Petr-All Petroleum Consulting Corporation for total consideration of $266 million. These stores are located primarily in the Syracuse, Rochester and Buffalo markets in New York and had been operated under the Express Mart brand.

Based on the final fair value estimates of assets acquired and liabilities assumed at the acquisition date, $97 million of the purchase price was allocated to property, plant and equipment, $9 million to inventory, $2 million to intangibles and $158 million to goodwill. Goodwill is tax deductible and represents the value expected to be created by geographically expanding our retail platform and the assembled workforce. These operations are accounted for within the Retail segment.

Acquisition of Mt. Airy Terminal

On September 26, 2018, MPLX acquired an eastern U.S. Gulf Coast export terminal (“Mt. Airy Terminal”) from Pin Oak Holdings, LLC for total consideration of $451 million. At the time of the acquisition, the terminal included tanks with 4 million barrels of third-party leased storage capacity and a dock with 120 mbpd of capacity. The Mt. Airy Terminal is located on the Mississippi River between New Orleans and Baton Rouge, near several Gulf Coast refineries, including our Garyville Refinery, and numerous rail lines and pipelines. The Mt. Airy Terminal is accounted for within the Midstream segment. In the first quarter of 2019, an adjustment to the initial purchase price was made for approximately $5 million related to the final settlement of the acquisition. This reduced the total purchase price to $446 million and resulted in $336 million of property, plant and equipment, $121 million of goodwill and the remainder being attributable to net liabilities assumed.

Goodwill represents the significant growth potential of the terminal due to the multiple pipelines and rail lines which cross the property, the terminal’s position as an aggregation point for liquids growth in the region for both ocean-going vessels and inland barges, the proximity of the terminal to MPC’s Garyville refinery and other refineries in the region as well as the opportunity to construct an additional dock at the site. All of the goodwill recognized related to this transaction is tax deductible.

Assuming the acquisition of the terminal and retail locations from NOCO Incorporated had occurred on January 1, 2018 and the acquisitions of Express Mart and Mt. Airy Terminal had occurred on January 1, 2017, the consolidated pro forma results would not have been materially different from the reported results.

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Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared per share of common stock (in dollars per share)	$ 0.53	$ 0.53	$ 0.53	$ 0.46	$ 0.46	$ 0.46

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Property, Plant and Equipment

9 Months Ended

Sep. 30, 2019

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

PROPERTY, PLANT AND EQUIPMENT

(In millions)	September 30, 2019		December 31, 2018
Refining & Marketing	$	28,470	$	27,590
Retail	6,939		6,637
Midstream	26,652		25,692
Corporate and Other	1,229		1,294
Total	63,290		61,213
Less accumulated depreciation	18,256		16,155
Property, plant and equipment, net	$	45,034	$	45,058

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Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits
Components of net periodic benefit cost:
Service cost	$ 57	$ 36	$ 175	$ 107
Interest cost	27	18	82	54
Expected return on plan assets	(31)	(25)	(94)	(75)
Amortization – prior service credit	(11)	(9)	(34)	(25)
Amortization – actuarial loss	5	9	16	26
Amortization - settlement loss	7	45	9	47
Net periodic benefit cost	54	74	154	134
Other Benefits
Components of net periodic benefit cost:
Service cost	8	7	24	22
Interest cost	9	7	28	22
Expected return on plan assets	0	0	0	0
Amortization – prior service credit	0	0	0	(2)
Amortization – actuarial loss	0	(1)	(1)	(1)
Amortization - settlement loss	0	0	0	0
Net periodic benefit cost	$ 17	$ 13	$ 51	$ 41

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Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$ 871		$ 520
Net income taxes paid to taxing authorities	376		153
Payments on operating leases	572	[1]	0
Interest payments under finance lease obligations	25	[1]	0
Net cash provided by financing activities included:
Principal payments under finance lease obligations	35	[1]	0
Non-cash investing and financing activities:
Capital leases	0		171
Right of use assets obtained in exchange for new operating lease obligations	235	[1]	0
Right of use assets obtained in exchange for new finance lease obligations	87	[1]	0
Contribution of net assets to Capline LLC	143	[2]	0
Recognition of Capline LLC equity method investment	$ 350	[2]	$ 0

[1] Disclosure added in 2019 following the adoption of ASC 842.

[2] See Note 13.

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Net Interest and Other Financial Costs

9 Months Ended

Sep. 30, 2019

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  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Interest income	$	(12	)	$	(26	)	$	(30	)	$	(71	)
Interest expense	352			233			1,042			675
Interest capitalized	(45		)	(21		)	(112		)	(55		)
Pension and other postretirement non-service costs(a)	6			45			6			47
Loss on extinguishment of debt	—			—			—			4
Other financial costs	16			9			39			18
Net interest and other financial costs	$	317		$	240		$	945		$	618

^(a) 

See Note 21.

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Equity (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Share Repurchases

Total share repurchases were as follows for the respective periods:

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions, except per share data)	2019		2018		2019		2018
Number of shares repurchased	10		5		33		36
Cash paid for shares repurchased	$	500	$	400	$	1,885	$	2,612
Average cost per share	$	53.82	$	73.03	$	58.75	$	71.80

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Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2019

Property, Plant and Equipment [Abstract]

Summary Of Property, Plant And Equipment

(In millions)	September 30, 2019		December 31, 2018
Refining & Marketing	$	28,470	$	27,590
Retail	6,939		6,637
Midstream	26,652		25,692
Corporate and Other	1,229		1,294
Total	63,290		61,213
Less accumulated depreciation	18,256		16,155
Property, plant and equipment, net	$	45,034	$	45,058

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Debt - MPLX Floating Rate Senior Notes (Details) - MPLX LP - Senior notes - USD ($) $ in Millions	Sep. 23, 2019	Sep. 09, 2019
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,060	$ 2,000
Floating Rate Senior Notes Due September 2021
Debt Instrument [Line Items]
Long-term debt, gross		1,000
Floating Rate Senior Notes Due September 2022
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,000

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Related Party Transactions (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Related Party Transactions [Abstract]
Sales to related parties	[1]	$ 186	$ 201	$ 558	$ 572
Purchases from related parties	[2]	$ 184	$ 149	$ 571	$ 428

[1] Sales to related parties, which are included in sales and other operating revenues, consist primarily of sales of refined products to PFJ Southeast, an equity affiliate which owns and operates travel plazas primarily in the Southeast region of the United States.

[2] We obtain utilities, transportation services and purchase ethanol from certain of our equity affiliates.

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Acquisitions - Acquisition of Terminal and Retail Locations in Buffalo, New York (Details) $ in Millions	Jul. 12, 2019 USD ($) Store bbl	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 21,277	$ 20,184
NOCO
Business Acquisition [Line Items]
Barrels handled | bbl	900,000
Number of stores | Store	33
Cash consideration	$ 135
Property, plant and equipment, net	38
Inventories	3
Goodwill	$ 94

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Debt - MPC 364-Day Bank Revolving Credit Facility (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jul. 26, 2019
MPC 364-day revolver due September 2020
Debt Instrument [Line Items]
Current borrowing capacity		$ 1,000
MPC 364-day revolver due September 2019
Debt Instrument [Line Items]
Current borrowing capacity	$ 1,000

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Derivatives - Open Commodity Derivative Contracts (Details) gal in Thousands, bbl in Thousands	9 Months Ended
	Sep. 30, 2019 bbl gal
Exchange Traded | Crude oil
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	92.10%
Exchange Traded | Crude oil | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	35,825	[1]
Exchange Traded | Crude oil | Long | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	6,520
Exchange Traded | Crude oil | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels) | gal	40,897	[1]
Exchange Traded | Crude oil | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	1,500
Exchange Traded | Refined products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	97.10%
Exchange Traded | Refined products | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	17,014	[1]
Exchange Traded | Refined products | Long | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	925
Exchange Traded | Refined products | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels) | gal	11,258	[1]
Exchange Traded | Refined products | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	225
Exchange Traded | Blending products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	84.20%
Exchange Traded | Blending products | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	2,750	[1]
Exchange Traded | Blending products | Long | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	257
Exchange Traded | Blending products | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels) | gal	7,708	[1]
Exchange Traded | Blending products | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	182
Over the Counter | Crude oil
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	100.00%
Over the Counter | Crude oil | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	160
Over the Counter | Crude oil | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	0
Over the Counter | Blending products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	100.00%
Over the Counter | Blending products | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	313
Over the Counter | Blending products | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels) | gal	313

[1] Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 6,520 long and 1,500 short; Refined products - 925 long and 225 short; Blending products - 257 long and 182 short

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Master Limited Partnership - Noncontrolling Interest in MLPs (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
	Jul. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (decrease) in MPC's additional paid-in capital, net of tax		$ (596)	$ 1	$ 2	$ 0	$ 0	$ (546)
Additional Paid-in Capital
Increase due to the issuance of MPLX common units and general partner units to MPC								$ 0	$ 1,114
Increase due to GP/IDR Exchange								0	1,808
Increase (decrease) due to the issuance of MPLX & ANDX common units								(52)	6
Increase (decrease) in MPC's additional paid-in capital								(52)	2,928
Tax impact	$ (642)							(634)	(546)
Increase (decrease) in MPC's additional paid-in capital, net of tax	$ (55)	$ (691)	$ 2	$ 3	$ 1	$ 1	$ 2,380	$ (686)	$ 2,382

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Description of the Business and Basis of Presentation (Details) bbl / d in Millions	9 Months Ended
	Sep. 30, 2019 Store bbl / d refinery
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Capacity | bbl / d	3
Number of refineries | refinery	16
Number of branded outlets	6,800
Number of retail transportation fuel and convenience stores	3,930
Number of direct dealer locations	1,070

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Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2019

Supplemental Cash Flow Elements [Abstract]

Summary of Supplemental Cash Flow Information

	Nine Months Ended  September 30,
(In millions)	2019		2018
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$	871	$	520
Net income taxes paid to taxing authorities	376		153
Cash paid for amounts included in the measurement of lease liabilities
Payments on operating leases(a)	572		—
Interest payments under finance lease obligations(a)	25		—
Net cash provided by financing activities included:
Principal payments under finance lease obligations(a)	35		—
Non-cash investing and financing activities:
Capital leases	—		171
Right of use assets obtained in exchange for new operating lease obligations(a)	235		—
Right of use assets obtained in exchange for new finance lease obligations(a)	87		—
Contribution of net assets to Capline LLC(b)	143		—
Recognition of Capline LLC equity method investment(b)	350		—

^(a)  Disclosure added in 2019 following the adoption of ASC 842.

^(b)  

See Note 13.

Schedule of Cash and Cash Equivalents

(In millions)	September 30, 2019		December 31, 2018
Cash and cash equivalents	$	1,525	$	1,687
Restricted cash(a)	3		38
Cash, cash equivalents and restricted cash	$	1,528	$	1,725

^(a)  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:

	Nine Months Ended  September 30,
(In millions)	2019			2018
Additions to property, plant and equipment per the consolidated statements of cash flows	$	3,823		$	2,315
Asset retirement expenditures	1			7
Increase (decrease) in capital accruals	(300		)	67
Total capital expenditures	$	3,524		$	2,389

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Equity - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock repurchase program, remaining authorized repurchase amount		$ 3,020		$ 3,020
Number of shares repurchased		10,000,000	5,000,000	33,000,000	36,000,000
Cash paid for shares repurchased		$ 500	$ 400	$ 1,885	$ 2,612
Forecast
Number of shares repurchased	97,078
Cash paid for shares repurchased	$ 6

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Inventories - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Inventory Disclosure [Abstract]
Impact on income as a result of LIFO liquidations	$ 0

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Fair Value Measurements - Recurring Narrative (Detail)	9 Months Ended
	Sep. 30, 2019 USD ($)
Embedded derivatives in commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded derivative renewal term	5 years
Level 3 | Commodity derivatives | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward commodity price	$ 0.41
Level 3 | Commodity derivatives | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward commodity price	$ 1.07
Level 3 | Embedded derivatives in commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Probability of renewal first term	93.00%
Probability of renewal second term	82.50%

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Segment Information - Reconciliation Of Segment Income From Operations To Income Before Income Taxes (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income from operations		$ 2,024	$ 1,403	$ 4,735		$ 3,554
Net interest and other financial costs		317	240	945		618
Income before income taxes		1,707	1,163	3,790		2,936
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income from operations		2,244	1,506	5,265		3,836
Corporate and Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income from operations	[1]	(198)	(99)	(568)		(269)
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Capline restructuring gain		0	0	207	[2]	0
Transaction-related costs(c)		(22)	(4)	(147)	[3]	(14)
Litigation		0	0	(22)		0
Impairments		$ 0	$ 0	$ 0		$ 1

[1] Corporate and other unallocated items 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. Corporate overhead expenses are not allocated to the Refining & Marketing and Retail segments.

[2] See Note 13.

[3] The transaction-related costs recognized in the 2019 year-to-date period include the recognition of an obligation for employee benefits provided to former Andeavor employees.

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Income Taxes - Out of Period Adjustment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Oct. 01, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision for income taxes	$ 340	$ 222	$ 797	$ 525
Goodwill	21,277		21,277		$ 20,184
Andeavor
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Goodwill						$ 17,335
Andeavor | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Provision for income taxes			36
Deferred tax liabilities	68		68
Goodwill	$ 32		$ 32			$ 1,021

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Derivatives - Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral (Detail) - Commodity derivatives - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Other current assets
Derivatives, Fair Value [Line Items]
Asset		$ 184	$ 400
Liability		176	283
Other current liabilities(a)
Derivatives, Fair Value [Line Items]
Asset		1	1
Liability	[1]	6	16
Deferred credits and other liabilities
Derivatives, Fair Value [Line Items]
Asset		0	0
Liability	[1]	$ 49	$ 54

[1] Includes embedded derivatives.

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Related Party Transactions

9 Months Ended

Sep. 30, 2019

Related Party Transactions [Abstract]

Related Party Transactions

RELATED PARTY TRANSACTIONS

Transactions with related parties were as follows:

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions)	2019		2018		2019		2018
Sales to related parties(a)	$	186	$	201	$	558	$	572
Purchases from related parties(b)	184		149		571		428

^(a)   Sales to related parties, which are included in sales and other operating revenues, consist primarily of sales of refined products to PFJ Southeast, an equity affiliate which owns and operates travel plazas primarily in the Southeast region of the United States.

^(b)  

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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Accounting Standards

9 Months Ended

Sep. 30, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recently Adopted

ACCOUNTING STANDARDS

Recently Adopted

ASU 2016-02, Leases

We adopted ASU No. 2016-02, Leases (“ASC 842”), as of January 1, 2019, electing the transition method which permits entities to adopt the provisions of the standard using the modified retrospective approach without adjusting comparative periods. We also elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to grandfather the historical accounting conclusions until a reassessment event is present. We have also elected the practical expedient to not recognize short-term leases on the balance sheet, the practical expedient related to right of way permits and land easements which allows us to carry forward our accounting treatment for those existing agreements, and the practical expedient to combine lease and non-lease components for the majority of our underlying classes of assets except for our third-party contractor service and equipment agreements and boat and barge equipment agreements in which we are the lessee. We did not elect the practical expedient to combine lease and non-lease components for arrangements in which we are the lessor. In instances where the practical expedient was not elected, lease and non-lease consideration is allocated based on relative standalone selling price.

Right of use (“ROU”) assets represent our right to use an underlying asset in which we obtain substantially all of the economic benefits and the right to direct the use of the asset during the lease term. Lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and lease liabilities are recognized at commencement date based on the present value of lease payments over the lease term. We recognize ROU assets and lease liabilities on the balance sheet for leases with a lease term of greater than one year. Payments that are not fixed at the commencement of the lease are considered variable and are excluded from the ROU asset and lease liability calculations. In the measurement of our ROU assets and lease liabilities, the fixed lease payments in the agreement are discounted using a secured incremental borrowing rate

for a term similar to the duration of the lease, as our leases do not provide implicit rates. Operating lease expense is recognized on a straight-line basis over the lease term.

Adoption of the new standard resulted in the recording of ROU assets and lease liabilities of approximately $2.8 billion and $2.9 billion, respectively, as of January 1, 2019. The standard did not materially impact our consolidated statements of income, cash flows or equity as a result of adoption.

As a lessor under ASC 842, MPLX may be required to re-classify existing operating leases to sales-type leases upon modification and related reassessment of the leases. As modifications occur, it may result in the de-recognition of existing assets and recognition of a receivable in the amount of the present value of fixed payments expected to be received by MPLX under the lease. MPLX will evaluate the impact of lease reassessments as modifications occur.

We also adopted the following ASUs during the first nine months of 2019, none of which had a material impact to our financial statements or financial statement disclosures:

ASU		Effective Date
2018-02	Reporting Comprehensive Income - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income	January 1, 2019
2017-12	Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities	January 1, 2019

Not Yet Adopted

Not Yet Adopted

ASU 2017-04, Intangibles - Goodwill and Other - Simplifying the Test for Goodwill Impairment

In January 2017, the FASB issued an ASU which simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. Under the new guidance, the recognition of an impairment charge is calculated based on the amount by which the carrying amount exceeds the reporting unit’s fair value, which could be different from the amount calculated under the current method using the implied fair value of the goodwill; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The guidance should be applied on a prospective basis and is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019.

ASU 2016-13, Credit Losses - Measurement of Credit Losses on Financial Instruments

In June 2016, the FASB issued an ASU related to the accounting for credit losses on certain financial instruments. The guidance requires that for most financial assets, losses be based on an expected loss approach which includes estimates of losses over the life of exposure that considers historical, current and forecasted information. Expanded disclosures related to the methods used to estimate the losses as well as a specific disaggregation of balances for financial assets are also required. The change is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. We do not expect application of this ASU to have a material impact on our consolidated financial statements.

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Consolidated Statements of Equity - Shares of Treasury Stock - shares shares in Millions	Total	Treasury Stock
Beginning balance at Dec. 31, 2017		(248)
Number of shares repurchased		(19)
Number of shares returned - stock compensation		0
Ending balance at Mar. 31, 2018		(267)
Beginning balance at Dec. 31, 2017		(248)
Number of shares repurchased	(36)
Ending balance at Sep. 30, 2018		(284)
Beginning balance at Mar. 31, 2018		(267)
Number of shares repurchased		(12)
Number of shares returned - stock compensation		0
Ending balance at Jun. 30, 2018		(279)
Number of shares repurchased	(5)	(5)
Number of shares returned - stock compensation		0
Ending balance at Sep. 30, 2018		(284)
Beginning balance at Dec. 31, 2018	(295)	(295)
Number of shares repurchased		(14)
Number of shares returned - stock compensation		0
Ending balance at Mar. 31, 2019		(309)
Beginning balance at Dec. 31, 2018	(295)	(295)
Number of shares repurchased	(33)
Ending balance at Sep. 30, 2019	(328)	(328)
Beginning balance at Mar. 31, 2019		(309)
Number of shares repurchased		(9)
Number of shares returned - stock compensation		0
Ending balance at Jun. 30, 2019		(318)
Number of shares repurchased	(10)	(10)
Number of shares returned - stock compensation		0
Ending balance at Sep. 30, 2019	(328)	(328)

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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 1,367	$ 941	$ 2,993	$ 2,411
Defined benefit plans:
Actuarial changes, net of tax of ($14), $24, ($8) and $29, respectively	(42)	75	(46)	89
Prior service credit, net of tax of ($3), ($3), ($14) and ($7), respectively	(8)	(7)	(19)	(21)
Other, net of tax of $0, ($1), ($1) and ($2), respectively	(1)	(3)	(3)	(5)
Other comprehensive income (loss)	(51)	65	(68)	63
Comprehensive income	1,316	1,006	2,925	2,474
Less comprehensive income attributable to:
Redeemable noncontrolling interest	20	19	61	55
Noncontrolling interests	252	185	738	527
Comprehensive income attributable to MPC	$ 1,044	$ 802	$ 2,126	$ 1,892

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net income	$ 2,993	$ 2,411
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred financing costs and debt discount	19	51
Depreciation and amortization	2,660	1,616
Pension and other postretirement benefits, net	(110)	38
Deferred income taxes	772	42
Net gain on disposal of assets	(222)	(6)
Income from equity method investments	(330)	(262)
Distributions from equity method investments	473	345
Changes in the fair value of derivative instruments	(34)	13
Changes in operating assets and liabilities, net of effects of businesses acquired:
Current receivables	(1,615)	(709)
Inventories	182	215
Current accounts payable and accrued liabilities	1,942	(316)
Right of use assets and operating lease liabilities, net	20	0
All other, net	282	(7)
Net cash provided by operating activities	7,032	3,431
Investing activities:
Additions to property, plant and equipment	(3,823)	(2,315)
Acquisitions, net of cash acquired	(129)	(453)
Disposal of assets	44	19
Investments – acquisitions, loans and contributions	(792)	(222)
Investments - redemptions, repayments and return of capital	75	16
All other, net	50	60
Net cash used in investing activities	(4,575)	(2,895)
Financing activities:
Long-term debt – borrowings	13,774	10,735
Long-term debt – repayments	(12,554)	(5,401)
Debt issuance costs	(22)	(53)
Issuance of common stock	6	24
Common stock repurchased	(1,885)	(2,612)
Dividends paid	(1,054)	(637)
Distributions to noncontrolling interests	(950)	(599)
Contributions from noncontrolling interests	95	9
All other, net	(64)	(22)
Net cash provided by (used in) financing activities	(2,654)	1,444
Net increase (decrease) in cash, cash equivalents and restricted cash	(197)	1,980
Cash, cash equivalents and restricted cash at beginning of period	1,725	3,015
Cash, cash equivalents and restricted cash at end of period	$ 1,528	$ 4,995

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Leases Schedule of Future Future Rental Payments Receivable for Operating Leases (Details) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
2019	$ 47
2020	186
2021	178
2022	176
2023	170
2024 and thereafter	1,269
Total minimum future rentals	$ 2,026

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Pension and Other Postretirement Benefits

9 Months Ended

Sep. 30, 2019

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 September 30, 2019
	Pension Benefits						Other Benefits
(In millions)	2019			2018			2019		2018
Components of net periodic benefit cost:
Service cost	$	57		$	36		$	8	$	7
Interest cost	27			18			9		7
Expected return on plan assets	(31		)	(25		)	—		—
Amortization – prior service credit	(11		)	(9		)	—		—
– actuarial loss	5			9			—		(1		)
– settlement loss	7			45			—		—
Net periodic benefit cost	$	54		$	74		$	17	$	13

	Nine Months Ended September 30,
	Pension Benefits						Other Benefits
(In millions)	2019			2018			2019			2018
Components of net periodic benefit cost:
Service cost	$	175		$	107		$	24		$	22
Interest cost	82			54			28			22
Expected return on plan assets	(94		)	(75		)	—			—
Amortization – prior service credit	(34		)	(25		)	—			(2		)
– actuarial loss	16			26			(1		)	(1		)
– settlement loss	9			47			—			—
Net periodic benefit cost	$	154		$	134		$	51		$	41

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 nine months ended September 30, 2019, we made contributions of $267 million to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $16 million and $32 million, respectively, during the nine months ended September 30, 2019.

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Description of the Business and Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2019

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.

Inventories

Inventories are carried at the lower of cost or market value. The cost of inventories of crude oil and refinery feedstocks, refined products and merchandise is determined primarily under the LIFO method.

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 and (6) the purchase of natural gas.

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Commitments and Contingencies - Other Lawsuits (Details) - Emergency Pricing And Consumer Protection Laws $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Pending Litigation
Loss Contingencies [Line Items]
Damages sought, value	$ 89
Settled Litigation
Loss Contingencies [Line Items]
Name of plaintiff	Commonwealth of Kentucky
Period of occurrence	during September and October 2005

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Accounting Standards (Details) - Accounting Standards Update 2016-02 $ in Billions	9 Months Ended
	Sep. 30, 2019 USD ($)
Operating Lease Right Of Use Asset
New accounting pronouncement or change in accounting principle, effect of adoption, quantification	$ 2.8
Operating Lease Liability
New accounting pronouncement or change in accounting principle, effect of adoption, quantification	$ 2.9

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Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2019

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, 2017	$	(190	)	$	(48	)	$	4		$	3		$	(231	)
Other comprehensive income (loss) before reclassifications, net of tax of $10	35			(1		)	(2		)	—			32
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(25		)	(2		)	—			—			(27		)
– actuarial loss(a)	26			(1		)	—			—			25
– settlement loss(a)	47			—			—			—			47
Other	—			—			—			(4		)	(4		)
Tax effect	(12		)	1			—			1			(10		)
Other comprehensive income (loss)	71			(3		)	(2		)	(3		)	63
Balance as of September 30, 2018	$	(119	)	$	(51	)	$	2		$	—		$	(168	)

(In millions)	Pension Benefits			Other Benefits			Gain on Cash Flow Hedge		Workers Compensation			Total
Balance as of December 31, 2018	$	(132	)	$	(23	)	$	2	$	9		$	(144	)
Other comprehensive income (loss) before reclassifications, net of tax of ($20)	(58		)	1			—		—			(57		)
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(34		)	—			—		—			(34		)
– actuarial loss(a)	16			(1		)	—		—			15
– settlement loss(a)	9			—			—		—			9
Other	—			—			—		(4		)	(4		)
Tax effect	2			—			—		1			3
Other comprehensive loss	(65		)	—			—		(3		)	(68		)
Balance as of September 30, 2019	$	(197	)	$	(23	)	$	2	$	6		$	(212	)

^(a) 

These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Combined federal, state and foreign income tax rate	20.00%	19.00%	21.00%	18.00%
Federal statutory income tax rate, percent			21.00%
Unrecognized benefits	$ 201		$ 201

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Fair Value Measurements - Fair Values - Reported (Detail) - USD ($) $ in Billions	Sep. 30, 2019	Dec. 31, 2018
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 30.2	$ 26.5
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 28.3	$ 27.0

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Earnings Per Share - Anti-dilutive Shares (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stock Based Compensation Expense [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares issuable under stock-based compensation plans	4	0	3	0

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Inventories - Summary Of Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Crude oil and refinery feedstocks	$ 3,415	$ 3,655
Refined products	5,152	5,234
Materials and supplies	907	720
Merchandise	222	228
Total	$ 9,696	$ 9,837

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Fair Value Measurements - Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash collateral netted with derivative liabilities		$ 15	$ 13
Cash collateral netted with derivatives assets			52
Fair Value, Measurements, Recurring | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - netting and collateral	[1]	(161)	(323)
Commodity derivative instruments, assets - net carrying value on balance sheet	[2]	24	78
Commodity derivative instruments, assets - collateral pledged not offset		77	2
Commodity derivative instruments, liabilities - netting and collateral	[1]	(176)	(284)
Commodity derivative instruments, liabilities - net carrying value on balance sheet	[2]	1	8
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]	54	61
Commodity derivative instruments, liabilities - collateral pledged not offset		0	0
Fair Value, Measurements, Recurring | Level 1 | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - gross		176	370
Commodity derivative instruments, liabilities - gross		165	255
Fair Value, Measurements, Recurring | Level 1 | Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring | Level 2 | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - gross		9	31
Commodity derivative instruments, liabilities - gross		12	37
Fair Value, Measurements, Recurring | Level 2 | Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring | Level 3 | Commodity derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, assets - gross		0	0
Commodity derivative instruments, liabilities - gross		0	0
Fair Value, Measurements, Recurring | Level 3 | Embedded derivatives in commodity contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity derivative instruments, liabilities - gross		$ 54	$ 61

[1] Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of September 30, 2019, cash collateral of $15 million was netted with the mark-to-market derivative liabilities. As of December 31, 2018, cash collateral of $52 million was netted with mark-to-market derivative assets and $13 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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Segment Information - Income From Operations Attributable To Operating Segments (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 31,043	$ 22,988	$ 92,857	$ 64,171
Income from operations		2,024	1,403	4,735	3,554
Depreciation and amortization		855	555	2,660	1,616
Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues		6,337	3,719	18,702	10,365
Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues		37,380	26,707	111,559	74,536
Income from operations		2,244	1,506	5,265	3,836
Depreciation and amortization		810	538	2,529	1,566
Capital expenditures and investments	[1]	1,521	917	4,175	2,514
Refining & Marketing
Segment Reporting Information [Line Items]
Sales and other operating revenues		21,437	16,751	65,043	46,635
Refining & Marketing | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues		5,100	2,931	15,011	8,181
Refining & Marketing | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues		26,537	19,682	80,054	54,816
Income from operations		883	666	1,455	1,558
Depreciation and amortization		397	257	1,235	761
Capital expenditures and investments		561	226	1,385	613
Retail
Segment Reporting Information [Line Items]
Sales and other operating revenues		8,677	5,395	24,997	15,231
Retail | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues		2	1	6	4
Retail | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues		8,679	5,396	25,003	15,235
Income from operations		442	161	1,105	415
Depreciation and amortization		113	76	369	228
Capital expenditures and investments		177	98	370	225
Midstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		929	842	2,817	2,305
Midstream | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,235	787	3,685	2,180
Midstream | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues		2,164	1,629	6,502	4,485
Income from operations		919	679	2,705	1,863
Depreciation and amortization		300	205	925	577
Capital expenditures and investments		783	593	2,420	1,676
Reportable Segment
Segment Reporting Information [Line Items]
Sales and other operating revenues	[2]	$ 31,043	$ 22,988	$ 92,857	$ 64,171

[1] Capital expenditures include changes in capital accruals and investments in affiliates. See reconciliation from segment totals to MPC consolidated total capital expenditures below.

[2] Includes related party sales. See Note 6 for additional information.

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Master Limited Partnership

9 Months Ended

Sep. 30, 2019

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 September 30, 2019 we owned approximately 63 percent of the outstanding MPLX common units.

As described in Notes 4 and 5, we have consolidated Andeavor Logistics LP (“ANDX”) since October 1, 2018 in accordance with ASC 810 and previously recorded ANDX’s assets and liabilities to our balance sheet at preliminary fair values as of the Andeavor acquisition date of October 1, 2018.

On July 30, 2019, MPLX completed its acquisition of ANDX, and ANDX survived as a wholly-owned subsidiary of MPLX. At the effective time of the ANDX acquisition, each common unit held by ANDX’s public unitholders was converted into the right to receive 1.135 MPLX common units. ANDX common units held by MPC were converted into the right to receive 1.0328 MPLX common units. Additionally, as a result of MPLX’s acquisition of ANDX, 600,000 ANDX preferred units were converted into 600,000 preferred units of MPLX (“Series B preferred units”). Series B preferred unitholders are entitled to receive, when and if declared by the board, a fixed distribution of $68.75 per unit, per annum, payable semi-annually in arrears on February 15 and August 15, or the first business day thereafter. MPC accounted for this transaction as a common control transaction, as defined by ASC 805, which resulted in an increase to noncontrolling interest and a decrease to additional paid-in capital of approximately $55 million, net of tax. During the third quarter of 2019, we pushed down to MPLX the portion of the goodwill attributable to ANDX as of October 1, 2018. Due to this push down of goodwill, we also recorded an incremental

$642 million deferred tax liability associated with the portion of the non-deductible goodwill attributable to the noncontrolling interest in MPLX with an offsetting reduction of our additional paid-in capital balance.

Dropdowns to MPLX and GP/IDR Exchange

On February 1, 2018, we contributed refining logistics assets and fuels distribution services to MPLX in exchange for $4.1 billion in cash and approximately 112 million common units and 2 million general partner units from MPLX. MPLX financed the cash portion of the transaction with a $4.1 billion 364-day term loan facility, which was entered into on January 2, 2018. We agreed to waive approximately one-third of the first quarter 2018 distributions on the common units issued in connection with this transaction. The contributions of these assets were accounted for as transactions between entities under common control and we did not record a gain or loss.

Immediately following the February 1, 2018 dropdown to MPLX, our IDRs were cancelled and our economic general partner interest was converted into a non-economic general partner interest, all in exchange for 275 million newly issued MPLX common units (“GP/IDR Exchange”). As a result of this transaction, the general partner units and IDRs were eliminated, are no longer outstanding and no longer participate in distributions of cash from MPLX.

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 and ANDX, 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 and ANDX were as follows:

	Nine Months Ended  September 30,
(In millions)	2019			2018
Increase due to the issuance of MPLX common units and general partner units to MPC	$	—		$	1,114
Increase due to GP/IDR Exchange	—			1,808
Increase (decrease) due to the issuance of MPLX & ANDX common units	(52		)	6
Increase (decrease) in MPC's additional paid-in capital	(52		)	2,928
Tax impact	(634		)	(546		)
Increase (decrease) in MPC's additional paid-in capital, net of tax	$	(686	)	$	2,382

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Redeemable Noncontrolling Interest - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Temporary Equity [Abstract]
Beginning balance	$ 1,005	$ 1,004	$ 1,004	$ 1,003	$ 1,000	$ 1,000
Net income attributable to redeemable noncontrolling interest	20	21	20	19	20	16
Distributions to noncontrolling interests	(21)	(20)	(20)	(19)	(17)	(16)
Equity transactions of MPLX & ANDX	(36)
Ending balance	$ 968	$ 1,005	$ 1,004	$ 1,003	$ 1,003	$ 1,000

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Earnings per Share

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Earnings per Share

EARNINGS PER SHARE

We compute basic earnings per share by dividing net income attributable to MPC less income allocated to participating securities by the weighted average number of shares of common stock outstanding. Since MPC grants certain incentive compensation awards to employees and non-employee directors that are considered to be participating securities, we have calculated our earnings per share using the two-class method. Diluted income per share assumes exercise of certain stock-based compensation awards, provided the effect is not anti-dilutive.

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions, except per share data)	2019		2018		2019		2018
Basic earnings per share:
Allocation of earnings:
Net income attributable to MPC	$	1,095	$	737	$	2,194	$	1,829
Income allocated to participating securities	—		—		1		1
Income available to common stockholders – basic	$	1,095	$	737	$	2,193	$	1,828
Weighted average common shares outstanding	656		451		663		462
Basic earnings per share	$	1.67	$	1.63	$	3.31	$	3.96
Diluted earnings per share:
Allocation of earnings:
Net income attributable to MPC	$	1,095	$	737	$	2,194	$	1,829
Income allocated to participating securities	—		—		1		1
Income available to common stockholders – diluted	$	1,095	$	737	$	2,193	$	1,828
Weighted average common shares outstanding	656		451		663		462
Effect of dilutive securities	4		5		5		4
Weighted average common shares, including dilutive effect	660		456		668		466
Diluted earnings per share	$	1.66	$	1.62	$	3.28	$	3.92

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

	Three Months Ended  September 30,		Nine Months Ended  September 30,
(In millions)	2019	2018	2019	2018
Shares issuable under stock-based compensation plans	4	—	3	—

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Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2019

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, 2017	$	(190	)	$	(48	)	$	4		$	3		$	(231	)
Other comprehensive income (loss) before reclassifications, net of tax of $10	35			(1		)	(2		)	—			32
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(25		)	(2		)	—			—			(27		)
– actuarial loss(a)	26			(1		)	—			—			25
– settlement loss(a)	47			—			—			—			47
Other	—			—			—			(4		)	(4		)
Tax effect	(12		)	1			—			1			(10		)
Other comprehensive income (loss)	71			(3		)	(2		)	(3		)	63
Balance as of September 30, 2018	$	(119	)	$	(51	)	$	2		$	—		$	(168	)

(In millions)	Pension Benefits			Other Benefits			Gain on Cash Flow Hedge		Workers Compensation			Total
Balance as of December 31, 2018	$	(132	)	$	(23	)	$	2	$	9		$	(144	)
Other comprehensive income (loss) before reclassifications, net of tax of ($20)	(58		)	1			—		—			(57		)
Amounts reclassified from accumulated other comprehensive loss:
Amortization – prior service credit(a)	(34		)	—			—		—			(34		)
– actuarial loss(a)	16			(1		)	—		—			15
– settlement loss(a)	9			—			—		—			9
Other	—			—			—		(4		)	(4		)
Tax effect	2			—			—		1			3
Other comprehensive loss	(65		)	—			—		(3		)	(68		)
Balance as of September 30, 2019	$	(197	)	$	(23	)	$	2	$	6		$	(212	)

^(a) 

These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.

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Leases Lessor Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Lease revenue	$ 64	$ 195

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Commitments and Contingencies - Environmental Matters (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Accrued liabilities for remediation	$ 447	$ 455
Receivables for recoverable costs	$ 30	$ 35

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Subsequent Event

9 Months Ended

Sep. 30, 2019

Subsequent Events [Abstract]

Subsequent Event

SUBSEQUENT EVENT

On October 31, 2019, we announced plans to separate our retail transportation fuel and convenience store business, which is operated primarily under the Speedway brand, into an independent, publicly traded company. The transaction is intended to take the form of a tax-free distribution to MPC shareholders of publicly traded stock in the new independent retail transportation fuel and convenience store company. The transaction is expected to be completed by year-end 2020, subject to market, regulatory and certain other conditions, including final approval by the MPC Board of Directors, receipt of customary assurances regarding the intended tax-free nature of the transaction, and the effectiveness of a registration statement to be filed with the SEC. The Speedway business is currently a reporting unit within our Retail segment. Subsequent to the completion of the separation, the historical results of the Speedway business will be presented as discontinued operations in our consolidated financial statements.

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Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues and other income:
Sales and other operating revenues	$ 31,043	$ 22,988	$ 92,857	$ 64,171
Income from equity method investments	124	96	330	262
Net gain on disposal of assets	4	1	222	6
Other income	31	47	96	122
Total revenues and other income	31,202	23,132	93,505	64,561
Costs and expenses:
Cost of revenues (excludes items below)	27,300	20,606	82,942	57,772
Depreciation and amortization	855	555	2,660	1,616
Selling, general and administrative expenses	833	445	2,618	1,271
Other taxes	190	123	550	348
Total costs and expenses	29,178	21,729	88,770	61,007
Income from operations	2,024	1,403	4,735	3,554
Net interest and other financial costs	317	240	945	618
Income before income taxes	1,707	1,163	3,790	2,936
Provision for income taxes	340	222	797	525
Net income	1,367	941	2,993	2,411
Less net income attributable to:
Redeemable noncontrolling interest	20	19	61	55
Noncontrolling interests	252	185	738	527
Net income attributable to MPC	$ 1,095	$ 737	$ 2,194	$ 1,829
Basic:
Net income attributable to MPC per share	$ 1.67	$ 1.63	$ 3.31	$ 3.96
Weighted average shares outstanding (in shares)	656	451	663	462
Diluted:
Net income attributable to MPC per share	$ 1.66	$ 1.62	$ 3.28	$ 3.92
Weighted average shares outstanding (in shares)	660	456	668	466

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 21	$ 9
Preferred stock:
Shares issued	0	0
Shares outstanding	0	0
Par value	$ 0.01
Shares authorized	30,000,000
Common stock:
Shares issued	978,000,000	975,000,000
Par value	$ 0.01
Shares authorized	2,000,000,000
Treasury stock	(328,000,000)	(295,000,000)

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Pension and Other Postretirement Benefits - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 267
Other Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	16
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ 32

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Fair Value Measurements

9 Months Ended

Sep. 30, 2019

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 September 30, 2019 and December 31, 2018 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.

 

	September 30, 2019
	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	$	176	$	9	$	—	$	(161	)	$	24	$	77
Liabilities:
Commodity contracts	$	165	$	12	$	—	$	(176	)	$	1	$	—
Embedded derivatives in commodity contracts	—		—		54		—			54		—

	December 31, 2018
	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	$	370	$	31	$	—	$	(323	)	$	78	$	2
Liabilities:
Commodity contracts	$	255	$	37	$	—	$	(284	)	$	8	$	—
Embedded derivatives in commodity contracts	—		—		61		—			61		—

^(a)  Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of September 30, 2019, cash collateral of $15 million was netted with the mark-to-market derivative liabilities. As of December 31, 2018, cash collateral of $52 million was netted with mark-to-market derivative assets and $13 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.

Commodity derivatives in Level 1 are 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 in the fair value hierarchy.

Level 2 instruments are valued based on quoted prices for similar assets and liabilities in active markets, and inputs other than quoted prices, such as liquidity, that are observable for the asset or liability. Commodity derivatives in Level 2 are OTC contracts, which are valued using market quotations from independent price reporting agencies, third-party brokers and commodity exchange price curves that are corroborated with market data.

Level 3 instruments are OTC NGL contracts and embedded derivatives in commodity contracts. The embedded derivative liability relates to a natural gas purchase agreement embedded in a keep‑whole processing agreement. The fair value calculation for these Level 3 instruments at September 30, 2019 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.41 to $1.07 per gallon and (2) the probability of renewal of 93 percent for the first five-term and 82.5 percent for the second five-term of the natural gas purchase agreement and the related keep-whole processing agreement. For these contracts, increases in forward NGL prices result in a decrease in the fair value of the derivative assets and an increase in the fair value of the derivative liabilities. Increases or decreases in the fractionation spread result in an increase or decrease in the fair value of the embedded derivative liability. An increase in the probability of renewal would result in an increase in the fair value of the related embedded derivative liability.

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

	Three Months Ended  September 30,						Nine Months Ended  September 30,
(In millions)	2019			2018			2019			2018
Beginning balance	$	65		$	68		$	61		$	66
Unrealized and realized losses included in net income	(9		)	20			(2		)	29
Settlements of derivative instruments	(2		)	(4		)	(5		)	(11		)
Ending balance	$	54		$	84		$	54		$	84
The amount of total losses for the period included in earnings attributable to the change in unrealized losses relating to assets still held at the end of period:	$	(9	)	$	21		$	(5	)	$	22

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 and term loan facility, 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 $28.3 billion and $30.2 billion at September 30, 2019, respectively, and approximately $27.0 billion and $26.5 billion at December 31, 2018, 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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Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

The combined federal, state and foreign income tax rate was 20 percent and 19 percent for the three months ended September 30, 2019 and 2018, respectively, and 21 percent and 18 percent for the nine months ended September 30, 2019 and 2018, respectively. The effective tax rate for the three months ended September 30, 2019 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interests offset by equity compensation and state and local tax expense. The effective tax rate for the nine months ended September 30, 2019 was equal to the U.S. statutory rate of 21 percent primarily due to $36 million of state deferred tax expense recorded as an out of period adjustment, offset by permanent tax differences related to net income attributable to noncontrolling interests. The effective tax rate for the three and nine months ended September 30, 2018 was less than the U.S. statutory rate of 21 percent primarily due to certain permanent tax differences related to net income attributable to noncontrolling interest offset by state and local tax expense.

During the first quarter of 2019, MPC’s deferred tax liabilities increased $68 million with an offsetting increase to goodwill and the provision for income taxes of $32 million and $36 million, respectively for an out of period adjustment to correct the tax effects recorded in 2018 related to the Andeavor acquisition. The impact of the adjustment was not material to any previous period.

We are continuously undergoing examination of our income tax returns, which have been completed through the 2006 tax year for state returns and the 2008 tax year for our U.S. federal return. As of September 30, 2019, we had $201 million of unrecognized tax benefits.

Prior to its spinoff on June 30, 2011, Marathon Petroleum Corporation was included in the Marathon Oil Corporation (“Marathon Oil”) U.S. federal income tax returns for all applicable years. During the third quarter of 2017, Marathon Oil received a notice of Final Partnership Administrative Adjustment (“FPAA”) from the U.S. Internal Revenue Service for taxable year 2010, relating to certain partnership transactions. Marathon Oil filed a U.S. Tax Court petition disputing these adjustments during the fourth quarter of 2017. We received an FPAA for taxable years 2011-2014 for items resulting from this matter and filed a U.S. Tax Court petition for tax years 2011-2014 to dispute these corollary adjustments in the fourth quarter of 2017. In the third quarter of 2019, the U.S. Tax court entered a decision in favor of both Marathon Oil and us for all material items and the U.S. Internal Revenue Service is in the process of preparing the final reports for these tax years.

Pursuant to our tax sharing agreement with Marathon Oil, the unrecognized tax benefits related to pre-spinoff operations for which Marathon Oil was the taxpayer remain the responsibility of Marathon Oil and we have indemnified Marathon Oil accordingly. See Note 23 for indemnification information.

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Supplemental Cash Flow Information - Cash, Cash Equalivalents and Restricted Cash (Details) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents		$ 1,525	$ 1,687
Restricted cash	[1]	3	38
Cash, cash equivalents and restricted cash		$ 1,528	$ 1,725	$ 4,995	$ 3,015

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

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Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Summary of Earnings Per Common Share

We compute basic earnings per share by dividing net income attributable to MPC less income allocated to participating securities by the weighted average number of shares of common stock outstanding. Since MPC grants certain incentive compensation awards to employees and non-employee directors that are considered to be participating securities, we have calculated our earnings per share using the two-class method. Diluted income per share assumes exercise of certain stock-based compensation awards, provided the effect is not anti-dilutive.

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions, except per share data)	2019		2018		2019		2018
Basic earnings per share:
Allocation of earnings:
Net income attributable to MPC	$	1,095	$	737	$	2,194	$	1,829
Income allocated to participating securities	—		—		1		1
Income available to common stockholders – basic	$	1,095	$	737	$	2,193	$	1,828
Weighted average common shares outstanding	656		451		663		462
Basic earnings per share	$	1.67	$	1.63	$	3.31	$	3.96
Diluted earnings per share:
Allocation of earnings:
Net income attributable to MPC	$	1,095	$	737	$	2,194	$	1,829
Income allocated to participating securities	—		—		1		1
Income available to common stockholders – diluted	$	1,095	$	737	$	2,193	$	1,828
Weighted average common shares outstanding	656		451		663		462
Effect of dilutive securities	4		5		5		4
Weighted average common shares, including dilutive effect	660		456		668		466
Diluted earnings per share	$	1.66	$	1.62	$	3.28	$	3.92

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  September 30,		Nine Months Ended  September 30,
(In millions)	2019	2018	2019	2018
Shares issuable under stock-based compensation plans	4	—	3	—

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Inventories (Tables)

9 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Summary Of Inventories

(In millions)	September 30, 2019		December 31, 2018
Crude oil and refinery feedstocks	$	3,415	$	3,655
Refined products	5,152		5,234
Materials and supplies	907		720
Merchandise	222		228
Total	$	9,696	$	9,837

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Acquisitions - Acquisition of Express Mart (Details) $ in Millions	Nov. 16, 2018 USD ($) Store	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 21,277	$ 20,184
Express Mart
Business Acquisition [Line Items]
Number of stores | Store	78
Cash consideration	$ 266
Property, plant and equipment, net	97
Inventories	9
Finite-lived intangibles	2
Goodwill	$ 158

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Debt - MPC Trade Receivables Securitization Facility (Details) $ in Millions	Jul. 19, 2019 USD ($)
Trade receivables securitization facility due July 2021 [Member]
Debt Instrument [Line Items]
Current borrowing capacity	$ 750

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Derivatives - Effect of Commodity Derivative Instruments in Statements of Income (Detail) - Commodity derivatives - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2017	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Loss	$ 49	$ (66)	$ (33)	$ (151)
Sales and other operating revenues
Derivative Instruments, Gain (Loss) [Line Items]
Loss	(1)	3	(18)	1
Cost of revenues
Derivative Instruments, Gain (Loss) [Line Items]
Loss	$ 50	$ (69)	$ (15)	$ (152)

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Acquisitions - Acquisition of Andeavor (Details) - USD ($) $ in Millions	Oct. 01, 2018	Sep. 30, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 21,277	$ 20,184
Andeavor
Business Acquisition [Line Items]
Total fair value of consideration transferred	$ 23,460
Fair value of MPC shares issued	19,970
Cash payment to Andeavor stockholders	3,490
Goodwill	17,335
Goodwill, expected tax deductible amount	1,000
Andeavor | Refining & Marketing
Business Acquisition [Line Items]
Goodwill	5,200
Andeavor | Midstream
Business Acquisition [Line Items]
Goodwill	8,100
Andeavor | Retail
Business Acquisition [Line Items]
Goodwill	$ 4,000

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Debt - MPLX Senior Notes (Details) - Senior notes - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 23, 2019	Sep. 09, 2019	Jul. 30, 2019
ANDX
Debt Instrument [Line Items]
Long-term debt, gross		$ 690
ANDX | Senior Notes Due October 2019
Debt Instrument [Line Items]
Long-term debt, gross		500
Repayments of debt	$ 500
ANDX | Senior Notes Due October 2019
Debt Instrument [Line Items]
Interest paid	$ 14
MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 3,060	$ 2,000
MPLX LP | ANDX
Debt Instrument [Line Items]
Long-term debt				$ 3,750

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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic earnings per share:
Net income attributable to MPC	$ 1,095	$ 737	$ 2,194	$ 1,829
Income allocated to participating securities	0	0	1	1
Income available to common stockholders – basic	$ 1,095	$ 737	$ 2,193	$ 1,828
Weighted average common shares outstanding (in shares)	656	451	663	462
Basic earnings per share	$ 1.67	$ 1.63	$ 3.31	$ 3.96
Diluted earnings per share:
Net income attributable to MPC	$ 1,095	$ 737	$ 2,194	$ 1,829
Income allocated to participating securities	0	0	1	1
Income available to common stockholders – diluted	$ 1,095	$ 737	$ 2,193	$ 1,828
Weighted average common shares outstanding (in shares)	656	451	663	462
Effect of dilutive securities (in shares)	4	5	5	4
Weighted average common shares, including dilutive effect (in shares)	660	456	668	466
Diluted earnings per share	$ 1.66	$ 1.62	$ 3.28	$ 3.92