$MPLX
MPLX LP Stock $mplx

$mplx Overview Financials Valuation SEC Filings Company Website

2020 Q1 Form 10-K Financial Statement

#000155200020000007 Filed on February 28, 2020

Income Statement

Concept	2020 Q1	2019	2018 Q4
Revenue	$992.0M	$9.041B	$2.295B
YoY Change	-55.62%	29.06%	111.52%
Cost Of Revenue	$874.0M	$3.707B	$978.0M
YoY Change	-1.24%	23.48%	95.21%
Gross Profit	$118.0M	$5.334B	$1.317B
YoY Change	-91.26%	33.25%	125.13%
Gross Profit Margin	11.9%	59.0%	57.39%
Selling, General & Admin	$128.0M	$487.0M	$127.0M
YoY Change	-1.54%	22.06%	56.79%
% of Gross Profit	108.47%	9.13%	9.64%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$325.0M	$1.254B	$302.0M
YoY Change	7.97%	44.64%	79.76%
% of Gross Profit	275.42%	23.51%	22.93%
Operating Expenses	$453.0M	$1.741B	$429.0M
YoY Change	5.1%	37.52%	72.29%
Operating Profit	-$335.0M	$3.593B	$888.0M
YoY Change	-136.45%	31.28%	164.29%
Interest Expense	-$200.0M	-$867.0M	-$207.0M
YoY Change	-9.5%	43.54%	158.75%
% of Operating Profit		-24.13%	-23.31%
Other Income/Expense, Net	-$16.00M	-$53.00M	-$70.00M
YoY Change	77.78%	-55.46%	337.5%
Pretax Income	-$2.716B	$1.462B	$611.0M
YoY Change	-494.77%	-27.41%	155.65%
Income Tax	$0.00	$0.00	$0.00
% Of Pretax Income		0.0%	0.0%
Net Earnings	-$2.724B	$1.033B	$434.0M
YoY Change	-641.55%	-43.18%	82.35%
Net Earnings / Revenue	-274.6%	11.43%	18.91%
Basic Earnings Per Share
Diluted Earnings Per Share	-$2.575M	$1.581M	$763.2K
COMMON SHARES
Basic Shares Outstanding	1.058B shares
Diluted Shares Outstanding

Balance Sheet

Concept	2020 Q1	2019	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$57.00M	$15.00M	$77.00M
YoY Change	-38.71%	-80.52%	1440.0%
Cash & Equivalents	$57.00M	$15.00M	$77.00M
Short-Term Investments
Other Short-Term Assets	$45.00M	$119.0M	$98.00M
YoY Change	32.35%	15.53%	164.86%
Inventory	$105.0M	$110.0M	$98.00M
Prepaid Expenses
Receivables	$522.0M	$1.214B	$611.0M
Other Receivables	$47.00M	$26.00M	$9.000M
Total Short-Term Assets	$1.329B	$1.484B	$1.440B
YoY Change	39.6%	3.06%	157.6%
LONG-TERM ASSETS
Property, Plant & Equipment	$21.83B	$22.74B	$21.53B
YoY Change	47.33%	5.65%	76.62%
Goodwill	$7.700B		$10.02B
YoY Change	198.33%		346.15%
Intangibles	$1.055B		$1.359B
YoY Change	154.83%		200.0%
Long-Term Investments	$3.992B	$5.275B	$4.901B
YoY Change	-6.51%	7.63%	22.22%
Other Assets	$50.00M	$59.00M	$60.00M
YoY Change	51.52%	-1.67%	130.77%
Total Long-Term Assets	$35.68B	$38.95B	$37.89B
YoY Change	57.64%	2.8%	100.02%
TOTAL ASSETS
Total Short-Term Assets	$1.329B	$1.484B	$1.440B
Total Long-Term Assets	$35.68B	$38.95B	$37.89B
Total Assets	$37.01B	$40.43B	$39.33B
YoY Change	56.91%	2.81%	101.67%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$138.0M	$1.153B	$266.0M
YoY Change	25.45%	84.19%	76.16%
Accrued Expenses	$135.0M	$747.0M	$272.0M
YoY Change	-28.57%	-12.63%	17.75%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due		$9.000M
YoY Change
Total Short-Term Liabilities	$1.214B	$2.132B	$2.268B
YoY Change	17.98%	-6.0%	73.93%
LONG-TERM LIABILITIES
Long-Term Debt	$21.44B	$20.67B	$18.93B
YoY Change	44.48%	9.23%	138.21%
Other Long-Term Liabilities	$990.0M	$1.001B	$386.0M
YoY Change	27.25%	159.33%	41.39%
Total Long-Term Liabilities	$22.43B	$21.67B	$19.31B
YoY Change	43.62%	12.23%	135.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.214B	$2.132B	$2.268B
Total Long-Term Liabilities	$22.43B	$21.67B	$19.31B
Total Liabilities	$22.68B	$24.07B	$20.59B
YoY Change	44.92%	10.65%	141.47%
SHAREHOLDERS EQUITY
Retained Earnings
YoY Change
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$13.11B	$16.36B	$17.58B
YoY Change
Total Liabilities & Shareholders Equity	$37.01B	$40.43B	$39.33B
YoY Change	56.91%	2.81%	101.67%

Cashflow Statement

Concept	2020 Q1	2019	2018 Q4
OPERATING ACTIVITIES
Net Income	-$2.724B	$1.033B	$434.0M
YoY Change	-641.55%	-43.18%	82.35%
Depreciation, Depletion And Amortization	$325.0M	$1.254B	$302.0M
YoY Change	7.97%	44.64%	79.76%
Cash From Operating Activities	$1.009B	$4.082B	$1.044B
YoY Change	18.29%	32.92%	83.48%
INVESTING ACTIVITIES
Capital Expenditures	$379.0M	$2.408B	-$728.0M
YoY Change	-34.09%	14.07%	78.87%
Acquisitions
YoY Change
Other Investing Activities	$0.00	-$4.000M	-$123.0M
YoY Change		300.0%	95.24%
Cash From Investing Activities	-$362.0M	-$3.063B	-$851.0M
YoY Change	-48.29%	6.43%	81.06%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$0.00	$0.00
YoY Change
Debt Paid & Issued, Net	$581.0M	$7.924B
YoY Change	-29.23%	14.08%
Cash From Financing Activities	-$605.0M	-$1.089B	-147.0M
YoY Change	421.55%	830.77%	51.55%
NET CHANGE
Cash From Operating Activities	$1.009B	$4.082B	1.044B
Cash From Investing Activities	-$362.0M	-$3.063B	-851.0M
Cash From Financing Activities	-$605.0M	-$1.089B	-147.0M
Net Change In Cash	$42.00M	-$70.00M	46.00M
YoY Change	13.51%	-192.11%	2200.0%
FREE CASH FLOW
Cash From Operating Activities	$1.009B	$4.082B	$1.044B
Capital Expenditures	$379.0M	$2.408B	-$728.0M
Free Cash Flow	$630.0M	$1.674B	$1.772B
YoY Change	126.62%	74.38%	81.56%

Facts In Submission

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CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-0005456
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	200 E. Hardin Street
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
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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	001-35714
CY2019	dei	Entity Registrant Name EntityRegistrantName	MPLX LP
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
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CY2019	dei	Security12b Title Security12bTitle	Common Units Representing Limited Partnership Interests
CY2019	dei	Trading Symbol TradingSymbol	MPLX
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
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CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2268000000	USD
CY2019Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	217000000	USD
CY2018Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	132000000	USD
CY2019Q4	mpc	Liabilities Related Parties Noncurrent LiabilitiesRelatedPartiesNoncurrent	290000000	USD
CY2018Q4	mpc	Liabilities Related Parties Noncurrent LiabilitiesRelatedPartiesNoncurrent	46000000	USD
CY2019Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	19704000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	17922000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	12000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	14000000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	302000000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	192000000	USD
CY2018Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	208000000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	22849000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	20590000000	USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	968000000	USD
CY2018Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	1004000000	USD
CY2019Q4	us-gaap	Partners Capital PartnersCapital	16364000000	USD
CY2018Q4	us-gaap	Partners Capital PartnersCapital	17575000000	USD
CY2019Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	249000000	USD
CY2018Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	156000000	USD
CY2019Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	16613000000	USD
CY2018Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	17731000000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	40430000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	39325000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1462000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	2006000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	836000000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	42000000	USD
CY2018	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	55000000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	53000000	USD
CY2019	us-gaap	Depreciation Depreciation	1254000000	USD
CY2018	us-gaap	Depreciation Depreciation	867000000	USD
CY2017	us-gaap	Depreciation Depreciation	683000000	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	1197000000	USD
CY2018	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2017	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1000000	USD
CY2019	mpc	Retirement Expenditures RetirementExpenditures	1000000	USD
CY2018	mpc	Retirement Expenditures RetirementExpenditures	7000000	USD
CY2017	mpc	Retirement Expenditures RetirementExpenditures	2000000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	6000000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-3000000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	290000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	247000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	78000000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	525000000	USD
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	412000000	USD
CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	241000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-17000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	104000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-8000000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	9000000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	5000000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	3000000	USD
CY2019	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-2000000	USD
CY2018	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	10000000	USD
CY2017	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-6000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-59000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	88000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	48000000	USD
CY2019	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	163000000	USD
CY2018	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	61000000	USD
CY2017	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-55000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-4000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	0	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	0	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	100000000	USD
CY2017	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	33000000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	9000000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	5000000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	28000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4082000000	USD
CY2017	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-80000000	USD
CY2019	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	30000000	USD
CY2018	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	8000000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	61000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3071000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1907000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2408000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2111000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1411000000	USD
CY2019	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	6000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	451000000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	249000000	USD
CY2019	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	0	USD
CY2018	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	0	USD
CY2017	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	7000000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	713000000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	341000000	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	761000000	USD
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	18000000	USD
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	16000000	USD
CY2017	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	26000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-4000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3063000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2878000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2308000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	9174000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	13476000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2911000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7924000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	6946000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	416000000	USD
CY2019	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	9313000000	USD
CY2018	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	3962000000	USD
CY2017	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	1120000000	USD
CY2017	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	2369000000	USD
CY2019	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	8719000000	USD
CY2018	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	4347000000	USD
CY2017	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	1983000000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	20000000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	76000000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	29000000	USD
CY2019	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	0	USD
CY2018	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	0	USD
CY2017	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	483000000	USD
CY2017	mpc	Paymentsof Distributionson Preferred Units PaymentsofDistributionsonPreferredUnits	65000000	USD
CY2019	mpc	Paymentsto Acquire Businessesand Equity Method Investments PaymentstoAcquireBusinessesandEquityMethodInvestments	0	USD
CY2018	mpc	Paymentsto Acquire Businessesand Equity Method Investments PaymentstoAcquireBusinessesandEquityMethodInvestments	4111000000	USD
CY2017	mpc	Paymentsto Acquire Businessesand Equity Method Investments PaymentstoAcquireBusinessesandEquityMethodInvestments	1951000000	USD
CY2019	mpc	Distributionsto Mp Cfrom Predecessor DistributionstoMPCfromPredecessor	0	USD
CY2018	mpc	Distributionsto Mp Cfrom Predecessor DistributionstoMPCfromPredecessor	0	USD
CY2017	mpc	Distributionsto Mp Cfrom Predecessor DistributionstoMPCfromPredecessor	113000000	USD
CY2019	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	2435000000	USD
CY2018	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	1819000000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	30000000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	17000000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	7000000	USD
CY2019	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	74000000	USD
CY2018	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	41000000	USD
CY2017	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	95000000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	11000000	USD
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	129000000	USD
CY2019	mpc	Paymentsto Class B Unitholders PaymentstoClassBUnitholders	0	USD
CY2018	mpc	Paymentsto Class B Unitholders PaymentstoClassBUnitholders	0	USD
CY2017	mpc	Paymentsto Class B Unitholders PaymentstoClassBUnitholders	25000000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-13000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	19000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-12000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1089000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-117000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	171000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-70000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	76000000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-230000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	85000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	9000000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	239000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	15000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	85000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	9000000	USD
CY2016Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	11110000000	USD
CY2017	mpc	Net Income Loss Including Portion Attributableto Noncontrolling Interest Excluding Portion Attributableto Temporary Equity NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingPortionAttributabletoTemporaryEquity	771000000	USD
CY2017	us-gaap	Partners Capital Account Sale Of Units PartnersCapitalAccountSaleOfUnits	483000000	USD
CY2017	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	0	USD
CY2017	us-gaap	Stockholders Equity Change In Reporting Entity StockholdersEquityChangeInReportingEntity	0	USD
CY2017	mpc	Distributionsto Mp Cfrom Predecessor DistributionstoMPCfromPredecessor	113000000	USD
CY2017	us-gaap	Partners Capital Account Acquisitions PartnersCapitalAccountAcquisitions	-1931000000	USD
CY2017	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	1120000000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	7000000	USD
CY2017	mpc	Distribution Madeto General Partner Cash Distribution Declared DistributionMadetoGeneralPartnerCashDistributionDeclared	32000000	USD
CY2017	mpc	Capital Contribution By Related Party CapitalContributionByRelatedParty	675000000	USD
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	129000000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	8000000	USD
CY2017Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	9973000000	USD
CY2018	mpc	Net Income Loss Including Portion Attributableto Noncontrolling Interest Excluding Portion Attributableto Temporary Equity NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingPortionAttributabletoTemporaryEquity	1931000000	USD
CY2018	us-gaap	Stockholders Equity Change In Reporting Entity StockholdersEquityChangeInReportingEntity	0	USD
CY2018	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	0	USD
CY2018	us-gaap	Partners Capital Account Acquisitions PartnersCapitalAccountAcquisitions	-4100000000	USD
CY2018	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	2058000000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	17000000	USD
CY2018	mpc	Capital Contribution By Related Party CapitalContributionByRelatedParty	11980000000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	11000000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	11000000	USD
CY2018Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	17731000000	USD
CY2019	mpc	Net Income Loss Including Portion Attributableto Noncontrolling Interest Excluding Portion Attributableto Temporary Equity NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingPortionAttributabletoTemporaryEquity	1381000000	USD
CY2019	us-gaap	Stockholders Equity Change In Reporting Entity StockholdersEquityChangeInReportingEntity	0	USD
CY2019	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	-36000000	USD
CY2019	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	2959000000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	30000000	USD
CY2019	mpc	Capital Contribution By Related Party CapitalContributionByRelatedParty	346000000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	95000000	USD
CY2019	us-gaap	Stockholders Equity Other StockholdersEquityOther	13000000	USD
CY2019Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	16613000000	USD
CY2012Q1	us-gaap	Limited Liability Company Or Limited Partnership Business Formation Date LimitedLiabilityCompanyOrLimitedPartnershipBusinessFormationDate	2012-03-27
CY2012Q4	mpc	Initial Public Offering Completion Date InitialPublicOfferingCompletionDate	2012-10-31
CY2018Q4	mpc	Current Assets Related Parties CurrentAssetsRelatedParties	556000000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</span><span style="font-family:inherit;font-size:10pt;"> – The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the respective reporting periods. Actual results could differ materially from those estimates. Estimates are subject to uncertainties due to the levels of subjectivity and judgment necessary to account for highly uncertain matters or the susceptibility of such matters to </span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">change and affect items such as valuing identified intangible assets; determining the fair value of derivative instruments; evaluating impairments of long-lived assets, goodwill and equity investments; establishing estimated useful lives for long-lived assets; acquisition accounting; recognizing share-based compensation expense; estimating revenues, expense accruals and capital expenditures; valuing AROs; and determining liabilities, if any, for environmental and legal contingencies.</span></div>
CY2018	us-gaap	Related Party Transaction Purchases From Related Party RelatedPartyTransactionPurchasesFromRelatedParty	8000000	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	1200000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	9500000000	USD
CY2018	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2019	mpc	Income Lossfrom Equity Method Investmentsfrom Asset Impairment IncomeLossfromEquityMethodInvestmentsfromAssetImpairment	28000000	USD
CY2019	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	14000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	21525000000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	272000000	USD
CY2018Q4	mpc	Current Liabilities Related Parties CurrentLiabilitiesRelatedParties	502000000	USD
CY2019	us-gaap	Incentive Distribution Policy Managing Member Or General Partner Description IncentiveDistributionPolicyManagingMemberOrGeneralPartnerDescription	<div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Distributions</span><span style="font-family:inherit;font-size:10pt;"> – In preparing the Consolidated Statements of Equity, net income attributable to MPLX LP is allocated to Series A and Series B preferred unitholders based on a fixed distribution schedule, as discussed in Notes </span><span style="font-family:inherit;font-size:10pt;">8</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">9</span><span style="font-family:inherit;font-size:10pt;">, and subsequently allocated to the general partner and limited partner unitholders. Distributions, although earned, are not accrued as a liability until declared. However, when distributions related to the eliminated IDRs were made, earnings equal to the amount of those distributions were first allocated to the general partner before the remaining earnings are allocated to the limited partner unitholders based on their respective ownership percentages. The allocation of net income attributable to MPLX LP for purposes of calculating net income per limited partner unit is described in below.</span></div>
CY2018Q4	mpc	Accrued Property Plant And Equipment Current AccruedPropertyPlantAndEquipmentCurrent	399000000	USD
CY2019	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Not Yet Adopted</span></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;padding-bottom:10px;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><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">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. </span></div>
CY2019	us-gaap	Revenues Revenues	9041000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	77000000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	611000000	USD
CY2018Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	184000000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	645000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2268000000	USD
CY2018Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	132000000	USD
CY2018Q4	us-gaap	Inventory Gross InventoryGross	98000000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	98000000	USD
CY2018Q4	us-gaap	Assets Current AssetsCurrent	1440000000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	4901000000	USD
CY2019	mpc	Equity Method Investment Summarized Financial Information Costsand Expenses EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses	943000000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1359000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	10016000000	USD
CY2018Q4	mpc	Other Assets Related Parties Noncurrent OtherAssetsRelatedPartiesNoncurrent	24000000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	60000000	USD
CY2018Q4	us-gaap	Assets Assets	39325000000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	266000000	USD
CY2018Q4	mpc	Liabilities Related Parties Noncurrent LiabilitiesRelatedPartiesNoncurrent	46000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	17922000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	14000000	USD
CY2018Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	208000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	20590000000	USD
CY2018Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	1004000000	USD
CY2018Q4	us-gaap	Partners Capital PartnersCapital	17575000000	USD
CY2018Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	156000000	USD
CY2018Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	17731000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	39325000000	USD
CY2019Q1	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-5000000	USD
CY2018Q1	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.02
CY2018Q1	mpc	Numberofstoragetanks Numberofstoragetanks	619	Tank
CY2018Q1	mpc	Numberofrailandtruckracks Numberofrailandtruckracks	32
CY2018Q1	mpc	Numberofdocksandgasolineblenders Numberofdocksandgasolineblenders	18
CY2017Q1	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.02
CY2017Q1	mpc	Numberofnaturalgasliquidsstoragecaverns Numberofnaturalgasliquidsstoragecaverns	8
CY2017Q1	mpc	Numberoflightproductterminals Numberoflightproductterminals	62
CY2019Q4	us-gaap	Equity Method Investments EquityMethodInvestments	5275000000	USD
CY2018Q4	us-gaap	Equity Method Investments EquityMethodInvestments	4901000000	USD
CY2019	mpc	Income Lossfrom Equity Method Investmentsfrom Asset Impairment IncomeLossfromEquityMethodInvestmentsfromAssetImpairment	28000000	USD
CY2019	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	14000000	USD
CY2019	mpc	Income Lossfrom Equity Method Investmentsfrom Asset Impairmentand Eliminationof Basis Differential IncomeLossfromEquityMethodInvestmentsfromAssetImpairmentandEliminationofBasisDifferential	42000000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	2067000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	9086000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	438000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	1036000000	USD
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	us-gaap	Related Party Transaction Purchases From Related Party RelatedPartyTransactionPurchasesFromRelatedParty	5000000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Income Loss From Continuing Operations Before Extraordinary Items EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	1124000000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	967000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	290000000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	1905000000	USD
CY2018	mpc	Equity Method Investment Summarized Financial Information Costsand Expenses EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses	1024000000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Income Loss From Continuing Operations Before Extraordinary Items EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	881000000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	803000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	247000000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	1227000000	USD
CY2017	mpc	Equity Method Investment Summarized Financial Information Costsand Expenses EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses	659000000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Income Loss From Continuing Operations Before Extraordinary Items EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems	568000000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	478000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	78000000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	864000000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	10996000000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	437000000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	1127000000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	667000000	USD
CY2019	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	114000000	USD
CY2018	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	99000000	USD
CY2017	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	92000000	USD
CY2019Q4	mpc	Current Assets Related Parties CurrentAssetsRelatedParties	656000000	USD
CY2018Q4	mpc	Current Assets Related Parties CurrentAssetsRelatedParties	556000000	USD
CY2019Q4	mpc	Other Assets Related Parties Noncurrent OtherAssetsRelatedPartiesNoncurrent	303000000	USD
CY2018Q4	mpc	Other Assets Related Parties Noncurrent OtherAssetsRelatedPartiesNoncurrent	24000000	USD
CY2019Q4	mpc	Current Liabilities Related Parties CurrentLiabilitiesRelatedParties	1008000000	USD
CY2018Q4	mpc	Current Liabilities Related Parties CurrentLiabilitiesRelatedParties	502000000	USD
CY2019Q4	mpc	Liabilities Related Parties Noncurrent LiabilitiesRelatedPartiesNoncurrent	290000000	USD
CY2018Q4	mpc	Liabilities Related Parties Noncurrent LiabilitiesRelatedPartiesNoncurrent	46000000	USD
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	10000000	USD
CY2018	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	6000000	USD
CY2017	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	393000000	shares
CY2017	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	396000000	shares
CY2019	mpc	Earnings Per Unit Potentially Dilutive Units EarningsPerUnitPotentiallyDilutiveUnits	1000000	shares
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1033000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1818000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	794000000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-1725000000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-242000000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-494000000	USD
CY2019	us-gaap	Distribution Made To Limited Partner Cash Distributions Declared DistributionMadeToLimitedPartnerCashDistributionsDeclared	2758000000	USD
CY2019	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-1725000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1033000000	USD
CY2019	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	906000000	shares
CY2019	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	907000000	shares
CY2018	us-gaap	Distribution Made To Limited Partner Cash Distributions Declared DistributionMadeToLimitedPartnerCashDistributionsDeclared	2060000000	USD
CY2018	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-242000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1818000000	USD
CY2018	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	761000000	shares
CY2018	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	761000000	shares
CY2017	us-gaap	Distribution Made To Limited Partner Cash Distributions Declared DistributionMadeToLimitedPartnerCashDistributionsDeclared	1288000000	USD
CY2017	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-494000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	794000000	USD
CY2019Q4	mpc	Common Stock Monetary Valueof Shares Authorized CommonStockMonetaryValueofSharesAuthorized	1700000000	USD
CY2016Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	368555271	shares
CY2017	us-gaap	Partners Capital Account Units Unitbased Compensation PartnersCapitalAccountUnitsUnitbasedCompensation	273639	shares
CY2017	us-gaap	Partners Capital Account Units Sale Of Units PartnersCapitalAccountUnitsSaleOfUnits	14129589	shares
CY2017	us-gaap	Partners Capital Account Units Converted PartnersCapitalAccountUnitsConverted	366509	shares
CY2017Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	415438793	shares
CY2018	us-gaap	Partners Capital Account Units Unitbased Compensation PartnersCapitalAccountUnitsUnitbasedCompensation	348527	shares
CY2018	us-gaap	Partners Capital Account Units Converted PartnersCapitalAccountUnitsConverted	264413309	shares
CY2018Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	794089518	shares
CY2019	us-gaap	Partners Capital Account Units Unitbased Compensation PartnersCapitalAccountUnitsUnitbasedCompensation	288031	shares
CY2019	us-gaap	Partners Capital Account Units Converted PartnersCapitalAccountUnitsConverted	1148330	shares
CY2019Q4	us-gaap	Partners Capital Account Units PartnersCapitalAccountUnits	1058355471	shares
CY2019	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.02
CY2017	mpc	Incentive Distribution Subsequent Distribution Amount IncentiveDistributionSubsequentDistributionAmount	303000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	794000000	USD
CY2017	us-gaap	Dividends Preferred Stock DividendsPreferredStock	65000000	USD
CY2017	mpc	Incentive Distribution Rights And Other IncentiveDistributionRightsAndOther	310000000	USD
CY2017	mpc	Net Income Loss Available To General And Limited Partners NetIncomeLossAvailableToGeneralAndLimitedPartners	419000000	USD
CY2017	mpc	Net Income Loss Allocated To General Partner Excluding Incentive Distribution NetIncomeLossAllocatedToGeneralPartnerExcludingIncentiveDistribution	8000000	USD
CY2017	mpc	Incentive Distribution Rights And Other IncentiveDistributionRightsAndOther	310000000	USD
CY2017	us-gaap	Net Income Loss Allocated To General Partners NetIncomeLossAllocatedToGeneralPartners	318000000	USD
CY2019	mpc	Managing Member Or General Partner Subsequent Distribution Amount Excluding Incentive Distribution ManagingMemberOrGeneralPartnerSubsequentDistributionAmountExcludingIncentiveDistribution	0	USD
CY2018	mpc	Managing Member Or General Partner Subsequent Distribution Amount Excluding Incentive Distribution ManagingMemberOrGeneralPartnerSubsequentDistributionAmountExcludingIncentiveDistribution	0	USD
CY2017	mpc	Managing Member Or General Partner Subsequent Distribution Amount Excluding Incentive Distribution ManagingMemberOrGeneralPartnerSubsequentDistributionAmountExcludingIncentiveDistribution	25000000	USD
CY2019	mpc	Incentive Distribution Subsequent Distribution Amount IncentiveDistributionSubsequentDistributionAmount	0	USD
CY2018	mpc	Incentive Distribution Subsequent Distribution Amount IncentiveDistributionSubsequentDistributionAmount	0	USD
CY2019	us-gaap	Managing Member Or General Partner Subsequent Distribution Amount ManagingMemberOrGeneralPartnerSubsequentDistributionAmount	0	USD
CY2018	us-gaap	Managing Member Or General Partner Subsequent Distribution Amount ManagingMemberOrGeneralPartnerSubsequentDistributionAmount	0	USD
CY2017	us-gaap	Managing Member Or General Partner Subsequent Distribution Amount ManagingMemberOrGeneralPartnerSubsequentDistributionAmount	328000000	USD
CY2019	us-gaap	Distribution Made To Limited Partner Cash Distributions Declared DistributionMadeToLimitedPartnerCashDistributionsDeclared	2758000000	USD
CY2018	us-gaap	Distribution Made To Limited Partner Cash Distributions Declared DistributionMadeToLimitedPartnerCashDistributionsDeclared	2060000000	USD
CY2017	us-gaap	Distribution Made To Limited Partner Cash Distributions Declared DistributionMadeToLimitedPartnerCashDistributionsDeclared	1288000000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2018	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2017	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2019	mpc	Interestand Other Financial Costs InterestandOtherFinancialCosts	873000000	USD
CY2018	mpc	Interestand Other Financial Costs InterestandOtherFinancialCosts	613000000	USD
CY2017	mpc	Interestand Other Financial Costs InterestandOtherFinancialCosts	301000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15000000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	77000000	USD
CY2019Q4	us-gaap	Assets Assets	40430000000	USD
CY2018Q4	us-gaap	Assets Assets	39325000000	USD
CY2019	us-gaap	Depreciation Depreciation	1254000000	USD
CY2018	us-gaap	Depreciation Depreciation	867000000	USD
CY2017	us-gaap	Depreciation Depreciation	683000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1000000	USD
CY2019	us-gaap	Extinguishment Of Debt Gain Loss Net Of Tax ExtinguishmentOfDebtGainLossNetOfTax	0	USD
CY2018	us-gaap	Extinguishment Of Debt Gain Loss Net Of Tax ExtinguishmentOfDebtGainLossNetOfTax	-46000000	USD
CY2017	us-gaap	Extinguishment Of Debt Gain Loss Net Of Tax ExtinguishmentOfDebtGainLossNetOfTax	0	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	-22000000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	-23000000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	-15000000	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	1197000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	290000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	247000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	78000000	USD
CY2017	mpc	Derivative Instruments Not Designatedas Hedging Instruments Unrealized Gain Loss Net DerivativeInstrumentsNotDesignatedasHedgingInstrumentsUnrealizedGainLossNet	-6000000	USD
CY2019	us-gaap	Acquisition Costs AcquisitionCosts	14000000	USD
CY2018	us-gaap	Acquisition Costs AcquisitionCosts	4000000	USD
CY2017	us-gaap	Acquisition Costs AcquisitionCosts	11000000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	1000000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	0	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	0	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1462000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	2006000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	836000000	USD
CY2019Q4	us-gaap	Energy Related Inventory Natural Gas Liquids EnergyRelatedInventoryNaturalGasLiquids	5000000	USD
CY2018Q4	us-gaap	Energy Related Inventory Natural Gas Liquids EnergyRelatedInventoryNaturalGasLiquids	9000000	USD
CY2019Q4	mpc	Natural Gas Or Natural Gas Liquids In Storage NaturalGasOrNaturalGasLiquidsInStorage	10000000	USD
CY2018Q4	mpc	Natural Gas Or Natural Gas Liquids In Storage NaturalGasOrNaturalGasLiquidsInStorage	9000000	USD
CY2019Q4	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	95000000	USD
CY2018Q4	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	80000000	USD
CY2019Q4	us-gaap	Inventory Gross InventoryGross	110000000	USD
CY2018Q4	us-gaap	Inventory Gross InventoryGross	98000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	26867000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	25213000000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	4722000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3688000000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	22145000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	21525000000	USD
CY2019Q4	us-gaap	Number Of Reporting Units NumberOfReportingUnits	12
CY2019Q4	us-gaap	Number Of Reporting Units NumberOfReportingUnits	6
CY2019Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1156000000	USD
CY2019Q4	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	41000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	9500000000	USD
CY2019Q4	us-gaap	Reporting Unit Zero Or Negative Carrying Amount Amount Of Allocated Goodwill ReportingUnitZeroOrNegativeCarryingAmountAmountOfAllocatedGoodwill	1	USD
CY2019Q4	us-gaap	Number Of Reporting Units NumberOfReportingUnits	6
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	2375000000	USD
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	130000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	2245000000	USD
CY2018	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	7771000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	10016000000	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1197000000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	717000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	9536000000	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	10863000000	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	1327000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	9536000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1571000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	301000000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1270000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1502000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	143000000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	1359000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	155000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	155000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	155000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	155000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	150000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	500000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1270000000	USD
CY2019Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	20119000000	USD
CY2018Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	18866000000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	106000000	USD
CY2018Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	97000000	USD
CY2019	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-5000000	USD
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CY2018	mpc	Non Cash Net Transfers Of Materials And Supplies Inventories NonCashNetTransfersOfMaterialsAndSuppliesInventories	2000000	USD
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CY2017	us-gaap	Contribution Of Property ContributionOfProperty	337000000	USD
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CY2017	mpc	Fair Value Of Assets Contributed FairValueOfAssetsContributed	1133000000	USD
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CY2017	mpc	Increase Decrease In Capital Accruals IncreaseDecreaseInCapitalAccruals	71000000	USD
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CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P10Y1M28D
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CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	78000000	USD
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CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	73000000	USD
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CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	56000000	USD
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CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	139000000	USD
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CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	445000000	USD
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CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	8000000	USD
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CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	19000000	USD
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CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	5000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	88000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	8000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	83000000	USD
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CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	76000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	2000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	70000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	2000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	825000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	4000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1232000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	24000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	3000000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	21000000	USD
CY2019Q4	us-gaap	Lessor Sales Type Lease Assumptions And Judgments Value Of Underlying Asset Amount LessorSalesTypeLeaseAssumptionsAndJudgmentsValueOfUnderlyingAssetAmount	29000000	USD
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CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	257000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	1320000000	USD
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CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	1304000000	USD
CY2019Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	1244000000	USD
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CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	1294000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	1239000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	4900000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	11619000000	USD
CY2019Q4	mpc	Salestypeand Direct Financing Leases Lease Receivable Paymentstobe Received Current Year SalestypeandDirectFinancingLeasesLeaseReceivablePaymentstobeReceivedCurrentYear	14000000	USD
CY2019Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Next Twelve Months SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths	14000000	USD
CY2019Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Two Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears	14000000	USD
CY2019Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Three Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears	15000000	USD
CY2019Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Four Years SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears	15000000	USD
CY2019Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received Thereafter SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter	20000000	USD
CY2019Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Payments To Be Received SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived	92000000	USD
CY2019Q4	us-gaap	Sales Type And Direct Financing Leases Lease Receivable Undiscounted Excess Amount SalesTypeAndDirectFinancingLeasesLeaseReceivableUndiscountedExcessAmount	45000000	USD
CY2019Q4	us-gaap	Sales Type Lease Lease Receivable SalesTypeLeaseLeaseReceivable	47000000	USD
CY2019Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	6947000000	USD
CY2018Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	6212000000	USD
CY2019Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	2355000000	USD
CY2018Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	2074000000	USD
CY2019Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	4592000000	USD
CY2018Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	4138000000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	19000000	USD
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	20000000	USD
CY2019Q4	us-gaap	Purchase Commitment Remaining Minimum Amount Committed PurchaseCommitmentRemainingMinimumAmountCommitted	753000000	USD
CY2019Q1	us-gaap	Revenues Revenues	2235000000	USD
CY2019Q2	us-gaap	Revenues Revenues	2210000000	USD
CY2019Q3	us-gaap	Revenues Revenues	2280000000	USD
CY2019Q4	us-gaap	Revenues Revenues	2316000000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	912000000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	885000000	USD
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CY2019Q3	us-gaap	Profit Loss ProfitLoss	689000000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	-573000000	USD
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CY2019Q1	mpc	Distributions Madeto Partners Total Cash Distribution Declared DistributionsMadetoPartnersTotalCashDistributionDeclared	543000000	USD
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CY2019Q4	mpc	Distributions Madeto Partners Total Cash Distribution Declared DistributionsMadetoPartnersTotalCashDistributionDeclared	747000000	USD
CY2018Q1	us-gaap	Revenues Revenues	1420000000	USD
CY2018Q2	us-gaap	Revenues Revenues	1578000000	USD
CY2018Q3	us-gaap	Revenues Revenues	1712000000	USD
CY2018Q4	us-gaap	Revenues Revenues	2295000000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	557000000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	608000000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	672000000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	891000000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	423000000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	456000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	516000000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	611000000	USD
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CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	453000000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	510000000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	434000000	USD
CY2018Q1	mpc	Distributions Madeto Partners Total Cash Distribution Declared DistributionsMadetoPartnersTotalCashDistributionDeclared	483000000	USD
CY2018Q2	mpc	Distributions Madeto Partners Total Cash Distribution Declared DistributionsMadetoPartnersTotalCashDistributionDeclared	517000000	USD
CY2018Q3	mpc	Distributions Madeto Partners Total Cash Distribution Declared DistributionsMadetoPartnersTotalCashDistributionDeclared	526000000	USD
CY2018Q4	mpc	Distributions Madeto Partners Total Cash Distribution Declared DistributionsMadetoPartnersTotalCashDistributionDeclared	534000000	USD

Files In Submission

Name	View Source	Status
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$MPLX
MPLX LP Stock $mplx

2020 Q1 Form 10-K Financial Statement

#000155200020000007 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MPLX MPLX LP Stock $mplx

2020 Q1 Form 10-K Financial Statement

#000155200020000007 Filed on February 28, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MPLX
MPLX LP Stock $mplx