$MPC
Marathon Petroleum Corp Stock $mpc

$mpc Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000151029520000006 Filed on February 28, 2020

Income Statement

Concept	2019 Q4	2019 Q3	2019 Q2
Revenue	$31.09B	$31.04B	$33.55B
YoY Change	-3.84%	35.04%	50.32%
Cost Of Revenue	$24.60B	$24.35B	$29.68B
YoY Change	27.64%	18.15%	51.02%
Gross Profit	$3.480B	$6.698B	$3.865B
YoY Change	26.41%	181.19%	45.19%
Gross Profit Margin	11.19%	21.58%	11.52%
Selling, General & Admin	$933.0M	$761.0M	$886.0M
YoY Change	-12.23%	71.01%	108.96%
% of Gross Profit	26.81%	11.36%	22.92%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$978.0M	$761.0M	$886.0M
YoY Change	11.9%	37.12%	66.23%
% of Gross Profit	28.1%	11.36%	22.92%
Operating Expenses	$1.783B	$761.0M	$886.0M
YoY Change	10.27%	71.01%	108.96%
Operating Profit	$558.0M	$1.680B	$1.698B
YoY Change	-72.34%	19.74%	-0.76%
Interest Expense	-$295.0M	-$293.0M	-$304.0M
YoY Change	-4.53%	14.9%	24.59%
% of Operating Profit	-52.87%	-17.44%	-17.9%
Other Income/Expense, Net	-$2.000M	-$19.00M	-$10.00M
YoY Change	-66.67%	-64.81%	42.86%
Pretax Income	$261.0M	$1.368B	$1.720B
YoY Change	-65.7%	17.63%	13.46%
Income Tax	$184.0M	$255.0M	$353.0M
% Of Pretax Income	70.5%	18.64%	20.52%
Net Earnings	$443.0M	$1.095B	$1.106B
YoY Change	-53.42%	48.58%	4.83%
Net Earnings / Revenue	1.42%	3.53%	3.3%
Basic Earnings Per Share	$0.68	$1.67	$1.67
Diluted Earnings Per Share	$0.68	$1.66	$1.66
COMMON SHARES
Basic Shares Outstanding	649.3M shares	656.0M shares	662.0M shares
Diluted Shares Outstanding		660.0M shares	666.0M shares

Balance Sheet

Concept	2019 Q4	2019 Q3	2019 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.393B	$1.525B	$1.247B
YoY Change	-17.43%	-69.45%	-75.06%
Cash & Equivalents	$1.393B	$1.525B	$1.247B
Short-Term Investments
Other Short-Term Assets	$893.0M	$457.0M	$458.0M
YoY Change	38.24%	241.04%	215.86%
Inventory	$9.804B	$9.696B	$9.088B
Prepaid Expenses
Receivables	$7.233B	$7.461B	$7.603B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$30.46B	$19.14B	$18.40B
YoY Change	69.0%	20.58%	18.32%
LONG-TERM ASSETS
Property, Plant & Equipment	$40.87B	$45.03B	$45.34B
YoY Change	-9.29%	62.48%	68.34%
Goodwill	$15.65B	$21.28B	$20.28B
YoY Change	-1.16%	473.04%	465.45%
Intangibles	$2.806B
YoY Change	-15.33%
Long-Term Investments	$6.568B	$6.725B	$6.729B
YoY Change	11.36%	36.97%	39.09%
Other Assets	$3.204B	$3.442B	$3.571B
YoY Change	-15.17%	320.78%	328.69%
Total Long-Term Assets	$68.10B	$79.00B	$78.50B
YoY Change	-9.1%	112.61%	116.92%
TOTAL ASSETS
Total Short-Term Assets	$30.46B	$19.14B	$18.40B
Total Long-Term Assets	$68.10B	$79.00B	$78.50B
Total Assets	$98.56B	$98.14B	$96.90B
YoY Change	6.04%	85.06%	87.29%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$11.22B	$11.38B	$10.91B
YoY Change	19.82%	41.97%	34.41%
Accrued Expenses	$1.501B	$1.525B	$1.393B
YoY Change	30.3%	209.33%	222.45%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$704.0M	$557.0M	$554.0M
YoY Change	29.41%	2042.31%	2030.77%
Total Short-Term Liabilities	$16.95B	$15.34B	$14.89B
YoY Change	28.24%	59.22%	53.27%
LONG-TERM LIABILITIES
Long-Term Debt	$28.02B	$28.28B	$27.85B
YoY Change	3.85%	53.51%	61.55%
Other Long-Term Liabilities	$4.089B	$4.714B	$4.852B
YoY Change	44.64%	171.86%	167.33%
Total Long-Term Liabilities	$32.11B	$33.00B	$32.71B
YoY Change	7.72%	63.69%	71.63%
TOTAL LIABILITIES
Total Short-Term Liabilities	$16.95B	$15.34B	$14.89B
Total Long-Term Liabilities	$32.11B	$33.00B	$32.71B
Total Liabilities	$55.45B	$54.52B	$52.83B
YoY Change	15.79%	65.21%	65.53%
SHAREHOLDERS EQUITY
Retained Earnings	$15.99B	$15.89B	$15.15B
YoY Change	8.37%	12.55%	11.46%
Common Stock	$33.17B	$33.14B	$33.80B
YoY Change	-1.7%	141.68%	146.77%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$15.14B	$15.08B	$14.57B
YoY Change	14.94%	20.66%	20.51%
Treasury Stock Shares	329.0M shares	328.0M shares	318.0M shares
Shareholders Equity	$33.69B	$33.74B	$34.21B
YoY Change
Total Liabilities & Shareholders Equity	$98.56B	$98.14B	$96.90B
YoY Change	6.04%	85.06%	87.29%

Cashflow Statement

Concept	2019 Q4	2019 Q3	2019 Q2
OPERATING ACTIVITIES
Net Income	$443.0M	$1.095B	$1.106B
YoY Change	-53.42%	48.58%	4.83%
Depreciation, Depletion And Amortization	$978.0M	$761.0M	$886.0M
YoY Change	11.9%	37.12%	66.23%
Cash From Operating Activities	$2.409B	$2.787B	$2.622B
YoY Change	-11.66%	135.79%	9.89%
INVESTING ACTIVITIES
Capital Expenditures	-$1.551B	-$1.404B	-$1.178B
YoY Change	22.8%	65.37%	65.68%
Acquisitions
YoY Change
Other Investing Activities	-$135.0M	-$291.0M	-$182.0M
YoY Change	-96.16%	-44.89%	527.59%
Cash From Investing Activities	-$1.686B	-$1.695B	-$1.360B
YoY Change	-64.69%	23.09%	83.78%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$500.0M	$500.0M
YoY Change		25.0%	-43.5%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-722.0M	-813.0M	-921.0M
YoY Change	-40.92%	-537.1%	-29.1%
NET CHANGE
Cash From Operating Activities	2.409B	2.787B	2.622B
Cash From Investing Activities	-1.686B	-1.695B	-1.360B
Cash From Financing Activities	-722.0M	-813.0M	-921.0M
Net Change In Cash	1.000M	279.0M	341.0M
YoY Change	-100.03%	-3200.0%	-1.73%
FREE CASH FLOW
Cash From Operating Activities	$2.409B	$2.787B	$2.622B
Capital Expenditures	-$1.551B	-$1.404B	-$1.178B
Free Cash Flow	$3.960B	$4.191B	$3.800B
YoY Change	-0.75%	106.35%	22.7%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001510295
CY2017	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Prior Service Cost Credit Adjustment Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetPriorServiceCostCreditAdjustmentTax	-16000000	USD
CY2018	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Prior Service Cost Credit Adjustment Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetPriorServiceCostCreditAdjustmentTax	12000000	USD
CY2019	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Prior Service Cost Credit Adjustment Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetPriorServiceCostCreditAdjustmentTax	-17000000	USD
CY2017	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentTax	17000000	USD
CY2018	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentTax	14000000	USD
CY2019	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentTax	-40000000	USD
CY2017	mpc	Other Comprehensive Income Other Tax OtherComprehensiveIncomeOtherTax	0	USD
CY2018	mpc	Other Comprehensive Income Other Tax OtherComprehensiveIncomeOtherTax	1000000	USD
CY2019	mpc	Other Comprehensive Income Other Tax OtherComprehensiveIncomeOtherTax	-1000000	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	9000000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	17000000	USD
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.52
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.84
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.12
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	2000000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	975000000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	978000000	shares
CY2017	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	0	USD
CY2018	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	0	USD
CY2019	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	23000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Tax OtherComprehensiveIncomeLossBeforeReclassificationsTax	-52000000	USD
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	30000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2018Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	295000000	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	329000000	shares
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-35054
CY2019	dei	Entity Registrant Name EntityRegistrantName	Marathon Petroleum Corporation
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-1284632
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	539 South Main Street
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Findlay
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	OH
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	45840-3229
CY2019	dei	City Area Code CityAreaCode	419
CY2019	dei	Local Phone Number LocalPhoneNumber	422-2121
CY2019	dei	Security12b Title Security12bTitle	Common Stock, par value $.01
CY2019	dei	Trading Symbol TradingSymbol	MPC
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019Q2	dei	Entity Public Float EntityPublicFloat	36700000000	USD
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	649503967	shares
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	123949000000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	96504000000	USD
CY2017	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	74733000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	394000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	373000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	306000000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	307000000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	23000000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	10000000	USD
CY2019	us-gaap	Other Operating Income OtherOperatingIncome	163000000	USD
CY2018	us-gaap	Other Operating Income OtherOperatingIncome	202000000	USD
CY2017	us-gaap	Other Operating Income OtherOperatingIncome	320000000	USD
CY2019	mpc	Revenues And Other Income RevenuesAndOtherIncome	124813000000	USD
CY2018	mpc	Revenues And Other Income RevenuesAndOtherIncome	97102000000	USD
CY2017	mpc	Revenues And Other Income RevenuesAndOtherIncome	75369000000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	110243000000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	86066000000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	67089000000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1197000000	USD
CY2018	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	3638000000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2490000000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2114000000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	3408000000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	2418000000	USD
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	1694000000	USD
CY2019	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	751000000	USD
CY2018	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	557000000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	454000000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	119237000000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	91531000000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	71351000000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	5576000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	5571000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	4018000000	USD
CY2019	us-gaap	Interest And Debt Expense InterestAndDebtExpense	1247000000	USD
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	1003000000	USD
CY2017	us-gaap	Interest And Debt Expense InterestAndDebtExpense	674000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4329000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4568000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3344000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1074000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	962000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-460000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	3255000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	3606000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	3804000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	81000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	75000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	65000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	537000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	751000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	307000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2637000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2780000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	3432000000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.00
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.36
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.76
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	659000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	518000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	507000000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.97
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.28
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.70
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	664000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	526000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	512000000	shares
CY2019	us-gaap	Profit Loss ProfitLoss	3255000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	3606000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	3804000000	USD
CY2019	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentNetofTax	-147000000	USD
CY2018	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentNetofTax	75000000	USD
CY2017	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentNetofTax	29000000	USD
CY2019	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Prior Service Cost Credit Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetPriorServiceCostCreditAdjustmentNetofTax	27000000	USD
CY2018	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Prior Service Cost Credit Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetPriorServiceCostCreditAdjustmentNetofTax	-8000000	USD
CY2017	mpc	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Prior Service Cost Credit Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetPriorServiceCostCreditAdjustmentNetofTax	26000000	USD
CY2019	us-gaap	Other Comprehensive Income Other Net Of Tax OtherComprehensiveIncomeOtherNetOfTax	-2000000	USD
CY2018	us-gaap	Other Comprehensive Income Other Net Of Tax OtherComprehensiveIncomeOtherNetOfTax	4000000	USD
CY2017	us-gaap	Other Comprehensive Income Other Net Of Tax OtherComprehensiveIncomeOtherNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-176000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	87000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	3079000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	3693000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	3807000000	USD
CY2019	mpc	Comprehensive Income Loss Netof Tax Attributableto Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetofTaxAttributabletoRedeemableNoncontrollingInterest	81000000	USD
CY2018	mpc	Comprehensive Income Loss Netof Tax Attributableto Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetofTaxAttributabletoRedeemableNoncontrollingInterest	75000000	USD
CY2017	mpc	Comprehensive Income Loss Netof Tax Attributableto Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetofTaxAttributabletoRedeemableNoncontrollingInterest	65000000	USD
CY2019	mpc	Comprehensive Income Loss Netof Tax Attributableto Nonredeemable Noncontrolling Interest ComprehensiveIncomeLossNetofTaxAttributabletoNonredeemableNoncontrollingInterest	537000000	USD
CY2018	mpc	Comprehensive Income Loss Netof Tax Attributableto Nonredeemable Noncontrolling Interest ComprehensiveIncomeLossNetofTaxAttributabletoNonredeemableNoncontrollingInterest	751000000	USD
CY2017	mpc	Comprehensive Income Loss Netof Tax Attributableto Nonredeemable Noncontrolling Interest ComprehensiveIncomeLossNetofTaxAttributabletoNonredeemableNoncontrollingInterest	307000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2461000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2867000000	USD
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CY2018Q4	us-gaap	Inventory Net InventoryNet	9837000000	USD
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CY2018Q4	us-gaap	Assets Current AssetsCurrent	18023000000	USD
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CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	5898000000	USD
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CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	45058000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	20040000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	20184000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	2459000000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
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CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	28127000000	USD
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CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	6392000000	USD
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CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	33729000000	USD
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CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	14755000000	USD
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CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	33694000000	USD
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CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
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CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	394000000	USD
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CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	662000000	USD
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CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	280000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	72000000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-202000000	USD
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CY2018	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	8032000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	642000000	USD
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CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	86000000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	33000000	USD
CY2017	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	89000000	USD
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CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-28000000	USD
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CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	954000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	773000000	USD
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CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	12000000	USD
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	129000000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	0	USD
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CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3376000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	222000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1091000000	USD
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CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	2123000000	USD
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CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3015000000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	892000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1529000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1725000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3015000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	20203000000	USD
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CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	774000000	USD
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CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2372000000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	85000000	USD
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CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1000000000	USD
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CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	955000000	USD
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CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	3287000000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	342000000	USD
CY2018	mpc	Impactof Subsidiary Equity Transactions ImpactofSubsidiaryEquityTransactions	-570000000	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	19766000000	USD
CY2018	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	5059000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	44049000000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1004000000	USD
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CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1402000000	USD
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CY2019	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	97000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-176000000	USD
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1950000000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	101000000	USD
CY2019	mpc	Impactof Subsidiary Equity Transactions ImpactofSubsidiaryEquityTransactions	-590000000	USD
CY2019	us-gaap	Stock Redeemed Or Called During Period Value StockRedeemedOrCalledDuringPeriodValue	36000000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	42139000000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	968000000	USD
CY2019Q4	mpc	Capacity Capacity	3000000
CY2019	mpc	Numberof Refineries NumberofRefineries	16	refinery
CY2019Q4	mpc	Numberofbrandedoutlets Numberofbrandedoutlets	6900	Store
CY2019Q4	mpc	Numberofretailtransportationfuelandconveniencestores Numberofretailtransportationfuelandconveniencestores	3900	Store
CY2019Q4	mpc	Numberofdirectdealerlocations Numberofdirectdealerlocations	1070	Store
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of Estimates</span><span style="font-family:inherit;font-size:10pt;"> </span></div><div style="line-height:120%;padding-top:4px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the respective reporting periods.</span></div>
CY2019	us-gaap	Revenue Recognition Sales Of Goods RevenueRecognitionSalesOfGoods	<div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Revenue Recognition</span></div><div style="line-height:120%;padding-top:4px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">We recognize revenue based on consideration specified in contracts or agreements with customers when we satisfy our performance obligations by transferring control over products or services to a customer. Concurrent with our adoption of ASU 2014-09, Revenue from Contracts with Customers (“ASC 606”), as of January 1, 2018, we made an accounting policy election that all taxes assessed by a governmental authority that are both imposed on and concurrent with a revenue-producing transaction and collected from our customers will be recognized on a net basis within sales and other operating revenues. </span></div><div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The adoption of ASC 606 did not materially change our revenue recognition patterns, which are described below by reportable segment:</span></div><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Refining & Marketing - The vast majority of our Refining & Marketing contracts contain pricing that is based on the market price for the product at the time of delivery. Our obligations to deliver product volumes are typically satisfied and revenue is recognized when control of the product transfers to our customers. Concurrent with the transfer of control, we typically receive the right to payment for the delivered product, the customer accepts the product and the customer has significant risks and rewards of ownership of the product. Payment terms require customers to pay shortly after delivery and do not contain significant financing components. </span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Retail - Revenue is recognized when our customers receive control of the transportation fuels or merchandise. Payments from customers are received at the time sales occur in cash or by credit or debit card at our company-owned and operated retail locations and shortly after delivery for our direct dealers. Speedway offers a loyalty rewards program to its customers. We defer a minor portion of revenue on sales to the loyalty program participants until the participants redeem their rewards. The related contract liability, as defined in ASC 606, is not material to our financial statements.</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><span style="font-family:inherit;font-size:10pt;">•</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Midstream - Midstream revenue transactions typically are defined by contracts under which we sell a product or provide a service. Revenues from sales of product are recognized when control of the product transfers to the customer. Revenues from sales of services are recognized over time when the performance obligation is satisfied as services are provided in a series. We have elected to use the output measure of progress to recognize revenue based on the units delivered, processed or transported. The transaction prices in our Midstream contracts often have both fixed components, related to minimum volume commitments, and variable components, which are primarily dependent on volumes. Variable consideration will generally not be estimated at contract inception as the transaction price is specifically allocable to the services provided at each period end. </span></div></td></tr></table><div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Refer to Note </span><span style="font-family:inherit;font-size:10pt;">20</span><span style="font-family:inherit;font-size:10pt;"> for disclosure of our revenue disaggregated by segment and product line and to Note </span><span style="font-family:inherit;font-size:10pt;">10</span><span style="font-family:inherit;font-size:10pt;"> for a description of our reportable segment operations.</span></div>
CY2019	mpc	Accounts Receivable Number Of Days Past Due Evaluated For Doubtful Account AccountsReceivableNumberOfDaysPastDueEvaluatedForDoubtfulAccount	P180D
CY2019	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Not Yet Adopted</span></div><div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">ASU 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes</span></div><div style="line-height:120%;padding-top:4px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">In December 2019, the FASB issued new guidance to simplify the accounting for income taxes. Amendments include removal of certain exceptions to the general principles of ASC 740 and simplification in several other areas such as accounting for a franchise tax or similar tax that is partially based on income. The change is effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. Early adoption is permitted in any interim or annual period, with any adjustments reflected as of the beginning of the fiscal year of adoption. We do not expect the application of this ASU to have a material impact on our consolidated financial statements. </span></div><div style="line-height:120%;padding-top:12px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">ASU 2016-13, Credit Losses - Measurement of Credit Losses on Financial Instruments</span></div>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. The application of this ASU will not have a material impact on our consolidated financial statements.
CY2018Q4	mpc	Pro Forma Purchase Accounting Inventory Effectsand Transactionrelated Costs Effecton Net Income Attributableto Mpc ProFormaPurchaseAccountingInventoryEffectsandTransactionrelatedCostsEffectonNetIncomeAttributabletoMPC	727000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2636000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2779000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	3430000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2637000000	USD
CY2019	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	768000000	USD
CY2018	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	754000000	USD
CY2017	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	629000000	USD
CY2019	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	763000000	USD
CY2018	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	610000000	USD
CY2017	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	570000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2780000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	3432000000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1000000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1000000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	2000000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	659000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	518000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	507000000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.00
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.36
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.76
CY2019	us-gaap	Net Income Loss NetIncomeLoss	2637000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	2780000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	3432000000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	1000000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	2000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	2636000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	2779000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	3430000000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	659000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	518000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	507000000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	5000000	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	8000000	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	5000000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	664000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	526000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	512000000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.97
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.28
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.70
CY2019Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	2960000000	USD
CY2019	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	34000000	shares
CY2018	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	47000000	shares
CY2017	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	44000000	shares
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1950000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3287000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2372000000	USD
CY2019	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	58.87
CY2018	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	69.46
CY2017	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	53.85
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	Segment
CY2019	us-gaap	Interest And Debt Expense InterestAndDebtExpense	1247000000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	5576000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	4018000000	USD
CY2019	mpc	Numberof Refineries NumberofRefineries	16	refinery
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	5571000000	USD
CY2018	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	80000000	USD
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	1003000000	USD
CY2017	us-gaap	Interest And Debt Expense InterestAndDebtExpense	674000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4329000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4568000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3344000000	USD
CY2019	mpc	Capital Expenditure CapitalExpenditure	5069000000	USD
CY2018	mpc	Capital Expenditure CapitalExpenditure	3895000000	USD
CY2017	mpc	Capital Expenditure CapitalExpenditure	2801000000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	40000000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	87000000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	27000000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	1396000000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	1026000000	USD
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	688000000	USD
CY2019	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	158000000	USD
CY2017	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	63000000	USD
CY2019	mpc	Non Service Pensionand Postretirement Costs NonServicePensionandPostretirementCosts	3000000	USD
CY2018	mpc	Non Service Pensionand Postretirement Costs NonServicePensionandPostretirementCosts	53000000	USD
CY2017	mpc	Non Service Pensionand Postretirement Costs NonServicePensionandPostretirementCosts	49000000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-64000000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	46000000	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	27000000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	27000000	USD
CY2019	us-gaap	Interest And Debt Expense InterestAndDebtExpense	1247000000	USD
CY2018	us-gaap	Interest And Debt Expense InterestAndDebtExpense	1003000000	USD
CY2017	us-gaap	Interest And Debt Expense InterestAndDebtExpense	674000000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3000000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	715000000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	681000000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	53000000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	178000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	98000000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1000000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	22000000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	-6000000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	51000000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	915000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	773000000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	898000000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1270000000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	116000000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	61000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1233000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	33000000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	9000000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-16000000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	4000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1023000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	47000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1074000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	962000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-460000000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.03
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.04
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.02
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0.03
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Deductions Other EffectiveIncomeTaxRateReconciliationDeductionsOther	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.03
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.04
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.04
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.45
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.01
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.02
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.25
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.21
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.14
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	693000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	660000000	USD
CY2019Q4	mpc	Deferred Tax Assets Environmental DeferredTaxAssetsEnvironmental	99000000	USD
CY2018Q4	mpc	Deferred Tax Assets Environmental DeferredTaxAssetsEnvironmental	111000000	USD
CY2019Q4	mpc	Deferred Tax Assets Debt Financing DeferredTaxAssetsDebtFinancing	17000000	USD
CY2018Q4	mpc	Deferred Tax Assets Debt Financing DeferredTaxAssetsDebtFinancing	39000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	18000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	17000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	15000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	28000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	14000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	21000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	57000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	88000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	913000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	964000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3444000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	2830000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	652000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	678000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	3114000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	2130000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	56000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	97000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	19000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	64000000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	7285000000	USD
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CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	4835000000	USD
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CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	4835000000	USD
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CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
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CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
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CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	32000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	211000000	USD
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CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	209000000	USD
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CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	18000000	USD
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CY2018Q4	us-gaap	Crude Oil And Natural Gas Liquids CrudeOilAndNaturalGasLiquids	3655000000	USD
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CY2019Q4	us-gaap	Retail Related Inventory Merchandise RetailRelatedInventoryMerchandise	227000000	USD
CY2018Q4	us-gaap	Retail Related Inventory Merchandise RetailRelatedInventoryMerchandise	228000000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	10243000000	USD
CY2018Q4	us-gaap	Inventory Net InventoryNet	9837000000	USD
CY2019Q4	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.90
CY2018Q4	us-gaap	Percentage Of Lifo Inventory PercentageOfLIFOInventory	0.92
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CY2018Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	0	USD
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	6898000000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	5898000000	USD
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CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	1333000000	USD
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CY2017	us-gaap	Equity Method Investment Summarized Financial Information Income Loss From Continuing Operations Before Extraordinary Items EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	1075000000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	1284000000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	1242000000	USD
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CY2019	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	7718000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	1443000000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	17216000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	12408000000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	1006000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	1857000000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	2772000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	1788000000	USD
CY2019Q4	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	1400000000	USD
CY2019Q4	mpc	Equity Method Investment Difference Between Carrying Amount And Underlying Equity Portion Related To Goodwilland Other Assets Not Amortized EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquityPortionRelatedToGoodwillandOtherAssetsNotAmortized	700000000	USD
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CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	391000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	64623000000	USD
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CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	16155000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	45615000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	45058000000	USD
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CY2018	us-gaap	Goodwill Transfers GoodwillTransfers	0	USD
CY2018Q4	us-gaap	Goodwill Goodwill	20184000000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	94000000	USD
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CY2019Q4	us-gaap	Goodwill Goodwill	20040000000	USD
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CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	372000000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	134000000	USD
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CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	780000000	USD
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CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	380000000	USD
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CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	305000000	USD
CY2019Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	51000000	USD
CY2018Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	52000000	USD
CY2018Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	13000000	USD
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CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	61000000	USD
CY2018Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	61000000	USD
CY2017Q4	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	66000000	USD
CY2019	us-gaap	Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	-5000000	USD
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CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	310000000	USD
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CY2019Q4	us-gaap	Debt Current DebtCurrent	711000000	USD
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CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	26980000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	650000000	USD
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CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	2652000000	USD
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CY2019Q4	us-gaap	Commercial Paper CommercialPaper	0	USD
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CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	96504000000	USD
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CY2019	us-gaap	Interest Paid Net InterestPaidNet	1174000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	887000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	525000000	USD
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CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	424000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	904000000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	764000000	USD
CY2018	us-gaap	Operating Lease Payments OperatingLeasePayments	0	USD
CY2017	us-gaap	Operating Lease Payments OperatingLeasePayments	0	USD
CY2019	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	525000000	USD
CY2018	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	0	USD
CY2017	us-gaap	Fair Value Of Assets Acquired FairValueOfAssetsAcquired	45000000	USD
CY2019	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	34000000	USD
CY2018	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	0	USD
CY2017	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	0	USD
CY2018	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	19766000000	USD
CY2017	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
CY2018	mpc	Contributionofnetassets Contributionofnetassets	0	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	55000000	USD
CY2017	mpc	Contributionofnetassets Contributionofnetassets	337000000	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
CY2017	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	0	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	172000000	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	71000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	352000000	USD
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CY2017	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	96000000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2017	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2019	mpc	Contributionofnetassets Contributionofnetassets	266000000	USD
CY2019	mpc	Business Combination Equity Interests Issued Conversionof Equity Awards BusinessCombinationEquityInterestsIssuedConversionofEquityAwards	0	USD
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CY2017	mpc	Business Combination Equity Interests Issued Conversionof Equity Awards BusinessCombinationEquityInterestsIssuedConversionofEquityAwards	0	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1527000000	USD
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CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1529000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1725000000	USD
CY2019	mpc	Capital Expenditure CapitalExpenditure	5069000000	USD
CY2018	mpc	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Settlement Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansForSettlementGainLossBeforeTax	-53000000	USD
CY2018	mpc	Capital Expenditure CapitalExpenditure	3895000000	USD
CY2017	mpc	Capital Expenditure CapitalExpenditure	2801000000	USD
CY2018	mpc	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Workers Compensation OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWorkersCompensation	5000000	USD
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CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	3578000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2732000000	USD
CY2019	mpc	Retirement Expenditures RetirementExpenditures	1000000	USD
CY2018	mpc	Retirement Expenditures RetirementExpenditures	8000000	USD
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CY2019	mpc	Increase Decrease In Accrual For Capital Expenditures IncreaseDecreaseInAccrualForCapitalExpenditures	-306000000	USD
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CY2017	mpc	Increase Decrease In Accrual For Capital Expenditures IncreaseDecreaseInAccrualForCapitalExpenditures	67000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-231000000	USD
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CY2018	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-36000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	87000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-144000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-144000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-162000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax	-45000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	-21000000	USD
CY2019	mpc	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Settlement Gain Loss Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansForSettlementGainLossBeforeTax	-9000000	USD
CY2019	mpc	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Workers Compensation OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForWorkersCompensation	5000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax	-6000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-176000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-320000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	3031000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	2632000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	3239000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Projected Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation	2779000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	3031000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Accumulated Benefit Obligation DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	2632000000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	2531000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets Aggregate Fair Value Of Plan Assets DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets	2089000000	USD
CY2019	us-gaap	Defined Benefit Plan Narrative Description Of Basis Used To Determine Overall Expected Long Term Rate Of Return On Assets Assumption DefinedBenefitPlanNarrativeDescriptionOfBasisUsedToDetermineOverallExpectedLongTermRateOfReturnOnAssetsAssumption	The overall expected long-term return on plan assets assumption is determined based on an asset rate-of-return modeling tool developed by a third-party investment group. The tool utilizes underlying assumptions based on actual returns by asset category and inflation and takes into account our asset allocation to derive an expected long-term rate of return on those assets. Capital market assumptions reflect the long-term capital market outlook. The assumptions for equity and fixed income investments are developed using a building-block approach, reflecting observable inflation information and interest rate information available in the fixed income markets. Long-term assumptions for other asset categories are based on historical results, current market characteristics and the professional judgment of our internal and external investment teams
CY2019	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	6000000	USD
CY2019	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	5000000	USD
CY2019	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	52000000	USD
CY2019	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	45000000	USD
CY2019	us-gaap	Defined Benefit Plan Investment Policies And Strategies Narrative Description DefinedBenefitPlanInvestmentPoliciesAndStrategiesNarrativeDescription	The asset allocation strategy will change over time in response to changes primarily in funded status, which is dictated by current and anticipated market conditions, the independent actions of our investment committee, required cash flows to and from the plans and other factors deemed appropriate. Such changes in asset allocation are intended to allocate additional assets to the fixed income asset class should the funded status improve. The fixed income asset class shall be invested in such a manner that its interest rate sensitivity correlates highly with that of the plans’ liabilities. Other asset classes are intended to provide additional return with associated higher levels of risk. Investment performance and risk is measured and monitored on an ongoing basis through quarterly investment meetings and periodic asset and liability studies.
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2531000000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2089000000	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	217000000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	144000000	USD
CY2017	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	116000000	USD
CY2019	mpc	Multiemployer Pension Plans Percentage Contribution By Entity MultiemployerPensionPlansPercentageContributionByEntity	0.05
CY2019	us-gaap	Multiemployer Plans Certified Zone Status MultiemployerPlansCertifiedZoneStatus	Red
CY2018	us-gaap	Multiemployer Plans Certified Zone Status MultiemployerPlansCertifiedZoneStatus	Red
CY2019	us-gaap	Multiemployer Plans Funding Improvement Plan And Rehabilitation Plan MultiemployerPlansFundingImprovementPlanAndRehabilitationPlan	Implemented
CY2019	us-gaap	Multiemployer Plans Surcharge MultiemployerPlansSurcharge	No
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	161000000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	133000000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	51000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	37000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	32000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	19000000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	10000000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	24000000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	46000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	-3000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	14000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions	25000000	USD
CY2019	us-gaap	Lease Cost LeaseCost	1737000000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	746000000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	64000000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	43000000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	793000000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	91000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	2459000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	604000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1875000000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	2479000000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P6Y2M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0402
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	698000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	96000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	590000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	87000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	402000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	95000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	287000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	98000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	222000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	84000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	634000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	527000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	2833000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	987000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	354000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	289000000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	2479000000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	698000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	709000000	USD
CY2018Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	70000000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	619000000	USD
CY2018Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	71000000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	553000000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	389000000	USD
CY2018Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	75000000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	295000000	USD
CY2018Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	82000000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	858000000	USD
CY2018Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	586000000	USD
CY2018Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	66000000	USD
CY2018Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	3423000000	USD
CY2018Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	950000000	USD
CY2018Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	301000000	USD
CY2018Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	649000000	USD
CY2019	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	254000000	USD
CY2018	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	221000000	USD
CY2017	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	218000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	186000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	179000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	177000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	170000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	167000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	1072000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	1951000000	USD
CY2019Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	1935000000	USD
CY2019Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	327000000	USD
CY2019Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	1608000000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	433000000	USD
CY2018Q1	us-gaap	Revenues Revenues	18866000000	USD
CY2018Q2	us-gaap	Revenues Revenues	22317000000	USD
CY2018Q3	us-gaap	Revenues Revenues	22988000000	USD
CY2018Q4	us-gaap	Revenues Revenues	32333000000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	443000000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.01
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.67
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.67
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.68
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.01
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.66
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.68
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	455000000	USD
CY2019Q4	us-gaap	Recorded Third Party Environmental Recoveries Receivable RecordedThirdPartyEnvironmentalRecoveriesReceivable	29000000	USD
CY2018Q4	us-gaap	Recorded Third Party Environmental Recoveries Receivable RecordedThirdPartyEnvironmentalRecoveriesReceivable	35000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	24000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	30000000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	206000000	USD
CY2018Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	222000000	USD
CY2019	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	1600000000	USD
CY2018	us-gaap	Long Term Purchase Commitment Amount LongTermPurchaseCommitmentAmount	1800000000	USD
CY2019Q1	us-gaap	Revenues Revenues	28267000000	USD
CY2019Q2	us-gaap	Revenues Revenues	33547000000	USD
CY2019Q3	us-gaap	Revenues Revenues	31043000000	USD
CY2019Q4	us-gaap	Revenues Revenues	31092000000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	669000000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	2042000000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	2024000000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	841000000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	259000000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	1367000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	1367000000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	262000000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-7000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	1106000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1095000000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	235000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	440000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	1711000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	1403000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	2017000000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	1235000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	941000000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	1195000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	37000000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	1055000000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	737000000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	951000000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.30
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.63
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.38
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.27
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.62
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.35

Files In Submission

Name	View Source	Status
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$MPC
Marathon Petroleum Corp Stock $mpc

2019 Q4 Form 10-K Financial Statement

#000151029520000006 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MPC Marathon Petroleum Corp Stock $mpc

2019 Q4 Form 10-K Financial Statement

#000151029520000006 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MPC
Marathon Petroleum Corp Stock $mpc