$MPLX
MPLX LP Stock $mplx

$mplx Overview Financials Valuation SEC Filings Company Website

2022 Q1 Form 10-K Financial Statement

#000155200022000007 Filed on February 24, 2022

Income Statement

Concept	2022 Q1	2021 Q4	2021
Revenue	$2.610B	$2.734B	$10.03B
YoY Change	11.59%	21.57%	32.47%
Cost Of Revenue	$1.125B	$1.249B	$4.233B
YoY Change	22.55%	51.76%	29.21%
Gross Profit	$1.485B	$1.485B	$5.794B
YoY Change	4.5%	4.14%	34.96%
Gross Profit Margin	56.9%	54.32%	57.78%
Selling, General & Admin	$112.0M	$113.0M	$473.0M
YoY Change	-5.08%	-5.83%	-5.96%
% of Gross Profit	7.54%	7.61%	8.16%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$313.0M	$316.0M	$1.287B
YoY Change	-4.86%	-17.92%	-6.54%
% of Gross Profit	21.08%	21.28%	22.21%
Operating Expenses	$425.0M	$429.0M	$1.760B
YoY Change	-4.92%	-15.05%	-6.38%
Operating Profit	$1.060B	$1.056B	$4.034B
YoY Change	8.83%	14.66%	67.18%
Interest Expense	-$202.0M	-$199.0M	-$793.0M
YoY Change	2.02%	-3.4%	-4.92%
% of Operating Profit	-19.06%	-18.84%	-19.66%
Other Income/Expense, Net	-$20.00M	-$19.00M	-$86.00M
YoY Change	-25.93%	46.15%	38.71%
Pretax Income	$838.0M	$838.0M	$3.113B
YoY Change	11.88%	19.54%	-554.45%
Income Tax	$5.000M	$0.00	$1.000M
% Of Pretax Income	0.6%	0.0%	0.03%
Net Earnings	$825.0M	$830.0M	$3.077B
YoY Change	11.64%	20.12%	-527.36%
Net Earnings / Revenue	31.61%	30.36%	30.69%
Basic Earnings Per Share
Diluted Earnings Per Share	$812.8K	$815.3K	$2.996M
COMMON SHARES
Basic Shares Outstanding	1.015B shares	1.020B shares
Diluted Shares Outstanding

Balance Sheet

Concept	2022 Q1	2021 Q4	2021
SHORT-TERM ASSETS
Cash & Short-Term Investments	$42.00M	$13.00M	$13.00M
YoY Change	75.0%	-13.33%	-13.33%
Cash & Equivalents	$42.00M	$13.00M	$13.00M
Short-Term Investments
Other Short-Term Assets	$70.00M	$61.00M	$61.00M
YoY Change	42.86%	-6.15%	-76.36%
Inventory	$149.0M	$142.0M	$142.0M
Prepaid Expenses
Receivables	$741.0M	$654.0M	$1.202B
Other Receivables	$89.00M	$89.00M	$89.00M
Total Short-Term Assets	$1.798B	$1.507B	$1.507B
YoY Change	30.86%	-0.53%	-0.53%
LONG-TERM ASSETS
Property, Plant & Equipment	$19.91B	$20.04B	$20.54B
YoY Change	-5.16%	-5.54%	-5.6%
Goodwill	$7.657B	$7.657B
YoY Change	0.0%	0.0%
Intangibles	$800.0M	$831.0M
YoY Change	-13.7%	-13.35%
Long-Term Investments	$4.079B	$3.981B	$3.981B
YoY Change	0.97%	-1.36%	-1.36%
Other Assets	$50.00M	$60.00M	$107.0M
YoY Change	-21.88%	25.0%	50.7%
Total Long-Term Assets	$33.93B	$34.00B	$34.00B
YoY Change	-2.1%	-2.58%	-2.58%
TOTAL ASSETS
Total Short-Term Assets	$1.798B	$1.507B	$1.507B
Total Long-Term Assets	$33.93B	$34.00B	$34.00B
Total Assets	$35.73B	$35.51B	$35.51B
YoY Change	-0.84%	-2.49%	-2.49%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$214.0M	$172.0M	$1.829B
YoY Change	32.1%	13.16%	398.37%
Accrued Expenses	$396.0M	$363.0M	$722.0M
YoY Change	69.96%	87.11%	28.01%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$999.0M	$499.0M	$499.0M
YoY Change	49850.0%	-34.69%	-34.86%
Total Short-Term Liabilities	$2.858B	$3.348B	$3.348B
YoY Change	138.96%	60.5%	60.5%
LONG-TERM LIABILITIES
Long-Term Debt	$19.72B	$19.04B	$19.04B
YoY Change	-6.18%	-6.42%	-6.42%
Other Long-Term Liabilities	$1.097B	$1.060B	$1.060B
YoY Change	15.11%	10.88%	10.88%
Total Long-Term Liabilities	$20.82B	$20.10B	$20.10B
YoY Change	-5.25%	-5.64%	-5.64%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.858B	$3.348B	$3.348B
Total Long-Term Liabilities	$20.82B	$20.10B	$20.10B
Total Liabilities	$22.73B	$22.49B	$23.70B
YoY Change	2.31%	0.27%	0.23%
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	$11.80B	$11.81B	$11.81B
YoY Change
Total Liabilities & Shareholders Equity	$35.73B	$35.51B	$35.51B
YoY Change	-0.84%	-2.49%	-2.49%

Cashflow Statement

Concept	2022 Q1	2021 Q4	2021
OPERATING ACTIVITIES
Net Income	$825.0M	$830.0M	$3.077B
YoY Change	11.64%	20.12%	-527.36%
Depreciation, Depletion And Amortization	$313.0M	$316.0M	$1.287B
YoY Change	-4.86%	-17.92%	-6.54%
Cash From Operating Activities	$1.125B	$1.240B	$4.911B
YoY Change	0.09%	4.64%	8.63%
INVESTING ACTIVITIES
Capital Expenditures	$169.0M	-$155.0M	$529.0M
YoY Change	34.13%	-22.89%	-55.28%
Acquisitions			$0.00
YoY Change
Other Investing Activities	$0.00	$14.00M	$0.00
YoY Change	-100.0%	-1500.0%	-100.0%
Cash From Investing Activities	-$276.0M	-$141.0M	-$518.0M
YoY Change	206.67%	-30.2%	-58.95%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$100.0M		$630.0M
YoY Change	-35.48%		1809.09%
Debt Paid & Issued, Net	$1.201B		$5.821B
YoY Change	-40.54%		-9.25%
Cash From Financing Activities	-$820.0M	-1.125B	-$4.395B
YoY Change	-20.0%	12.95%	34.86%
NET CHANGE
Cash From Operating Activities	$1.125B	1.240B	$4.911B
Cash From Investing Activities	-$276.0M	-141.0M	-$518.0M
Cash From Financing Activities	-$820.0M	-1.125B	-$4.395B
Net Change In Cash	$29.00M	-26.00M	-$2.000M
YoY Change	222.22%	100.0%
FREE CASH FLOW
Cash From Operating Activities	$1.125B	$1.240B	$4.911B
Capital Expenditures	$169.0M	-$155.0M	$529.0M
Free Cash Flow	$956.0M	$1.395B	$4.382B
YoY Change	-4.21%	0.65%	31.28%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001552000
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2020	mplx	Earnings Per Unit Potentially Dilutive Units EarningsPerUnitPotentiallyDilutiveUnits	1000000	shares
CY2021Q2	dei	Entity Public Float EntityPublicFloat	11200000000	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	1014627674	shares
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P2Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P3Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P4Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P5Y
CY2020Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#DebtCurrent
CY2021Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#DebtCurrent
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2021Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2020Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#DebtCurrent http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2021Q4	us-gaap	Finance Lease Liability Statement Of Financial Position Extensible List FinanceLeaseLiabilityStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2021-01-31#DebtCurrent http://fasb.org/us-gaap/2021-01-31#LongTermDebtAndCapitalLeaseObligations
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	001-35714
CY2021	dei	Entity Registrant Name EntityRegistrantName	MPLX LP
CY2021	dei	City Area Code CityAreaCode	419
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	27-0005456
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	200 E. Hardin Street
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Findlay
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	OH
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	45840-3229
CY2021	dei	Local Phone Number LocalPhoneNumber	421-2414
CY2021	dei	Security12b Title Security12bTitle	Common Units Representing Limited Partnership Interests
CY2021	dei	Trading Symbol TradingSymbol	MPLX
CY2021	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Auditor Firm AuditorFirmId	238
CY2021	dei	Auditor Name AuditorName	PricewaterhouseCoopers LLP
CY2021	dei	Auditor Location AuditorLocation	Toledo, Ohio
CY2021	mplx	Operating Lease Lease Income Related Party OperatingLeaseLeaseIncomeRelatedParty	743000000	USD
CY2020	mplx	Operating Lease Lease Income Related Party OperatingLeaseLeaseIncomeRelatedParty	952000000	USD
CY2019	mplx	Operating Lease Lease Income Related Party OperatingLeaseLeaseIncomeRelatedParty	1196000000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	321000000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-936000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	290000000	USD
CY2021	us-gaap	Other Income OtherIncome	21000000	USD
CY2020	us-gaap	Other Income OtherIncome	5000000	USD
CY2019	us-gaap	Other Income OtherIncome	12000000	USD
CY2021	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	110000000	USD
CY2020	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	102000000	USD
CY2019	us-gaap	Related Party Transaction Other Revenues From Transactions With Related Party RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty	107000000	USD
CY2021	us-gaap	Revenues Revenues	10027000000	USD
CY2020	us-gaap	Revenues Revenues	7569000000	USD
CY2019	us-gaap	Revenues Revenues	9041000000	USD
CY2021	us-gaap	Related Party Transaction Purchases From Related Party RelatedPartyTransactionPurchasesFromRelatedParty	1219000000	USD
CY2020	us-gaap	Related Party Transaction Purchases From Related Party RelatedPartyTransactionPurchasesFromRelatedParty	1116000000	USD
CY2019	us-gaap	Related Party Transaction Purchases From Related Party RelatedPartyTransactionPurchasesFromRelatedParty	1231000000	USD
CY2021	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	1287000000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	1377000000	USD
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CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	42000000	USD
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CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1197000000	USD
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	353000000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	378000000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	388000000	USD
CY2021	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	37000000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2021	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	120000000	USD
CY2020	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	125000000	USD
CY2019	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	113000000	USD
CY2021	us-gaap	Costs And Expenses CostsAndExpenses	6035000000	USD
CY2020	us-gaap	Costs And Expenses CostsAndExpenses	7358000000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	6664000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	3992000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	211000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	2377000000	USD
CY2021	mplx	Interest And Other Financial Costs From Related Parties InterestAndOtherFinancialCostsFromRelatedParties	8000000	USD
CY2020	mplx	Interest And Other Financial Costs From Related Parties InterestAndOtherFinancialCostsFromRelatedParties	5000000	USD
CY2019	mplx	Interest And Other Financial Costs From Related Parties InterestAndOtherFinancialCostsFromRelatedParties	11000000	USD
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	14000000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	39000000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	51000000	USD
CY2021	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	785000000	USD
CY2020	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	829000000	USD
CY2019	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	851000000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-86000000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-62000000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-53000000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3113000000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-685000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1462000000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2021	us-gaap	Profit Loss ProfitLoss	3112000000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-687000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1462000000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	35000000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	33000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	28000000	USD
CY2021	mplx	Income Loss Attributableto Predecessor IncomeLossAttributabletoPredecessor	0	USD
CY2020	mplx	Income Loss Attributableto Predecessor IncomeLossAttributabletoPredecessor	0	USD
CY2019	mplx	Income Loss Attributableto Predecessor IncomeLossAttributabletoPredecessor	401000000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	3077000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-720000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1033000000	USD
CY2021	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	2936000000	USD
CY2020	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	-842000000	USD
CY2019	us-gaap	Net Income Loss Allocated To Limited Partners NetIncomeLossAllocatedToLimitedPartners	935000000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	3112000000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-687000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1462000000	USD
CY2021	mplx	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentNetofTax	-2000000	USD
CY2020	mplx	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentNetofTax	0	USD
CY2019	mplx	Other Comprehensive Income Loss Pensionand Other Postretirement Benefit Plans Net Unamortized Gain Loss Adjustment Netof Tax OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentNetofTax	1000000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	3110000000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-687000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1463000000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	35000000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	33000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	28000000	USD
CY2021	mplx	Comprehensive Incomeloss Netof Tax Attributableto Predecessor ComprehensiveIncomelossNetofTaxAttributabletoPredecessor	0	USD
CY2020	mplx	Comprehensive Incomeloss Netof Tax Attributableto Predecessor ComprehensiveIncomelossNetofTaxAttributabletoPredecessor	0	USD
CY2019	mplx	Comprehensive Incomeloss Netof Tax Attributableto Predecessor ComprehensiveIncomelossNetofTaxAttributabletoPredecessor	401000000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3075000000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-720000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1034000000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13000000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15000000	USD
CY2021Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	654000000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	452000000	USD
CY2021Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	644000000	USD
CY2020Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	677000000	USD
CY2021Q4	us-gaap	Inventory Gross InventoryGross	142000000	USD
CY2020Q4	us-gaap	Inventory Gross InventoryGross	118000000	USD
CY2021Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
CY2020Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	188000000	USD
CY2021Q4	us-gaap	Assets Current AssetsCurrent	1507000000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	1515000000	USD
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3981000000	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	4036000000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	20042000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	21218000000	USD
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	831000000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	959000000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	7657000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	7657000000	USD
CY2021Q4	us-gaap	Due From Related Parties Noncurrent DueFromRelatedPartiesNoncurrent	1161000000	USD
CY2020Q4	us-gaap	Due From Related Parties Noncurrent DueFromRelatedPartiesNoncurrent	672000000	USD
CY2021Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	60000000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	48000000	USD
CY2021Q4	us-gaap	Assets Assets	35507000000	USD
CY2020Q4	us-gaap	Assets Assets	36414000000	USD
CY2021Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	172000000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	152000000	USD
CY2021Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	363000000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	194000000	USD
CY2021Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	1780000000	USD
CY2020Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	356000000	USD
CY2021Q4	mplx	Accrued Property Plant And Equipment Current AccruedPropertyPlantAndEquipmentCurrent	97000000	USD
CY2020Q4	mplx	Accrued Property Plant And Equipment Current AccruedPropertyPlantAndEquipmentCurrent	84000000	USD
CY2021Q4	us-gaap	Debt Current DebtCurrent	499000000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	764000000	USD
CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	202000000	USD
CY2020Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	222000000	USD
CY2021Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	176000000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	150000000	USD
CY2021Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
CY2020Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	101000000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3348000000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2086000000	USD
CY2021Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	383000000	USD
CY2020Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	314000000	USD
CY2021Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	302000000	USD
CY2020Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	283000000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	18072000000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	19375000000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	10000000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	12000000	USD
CY2021Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	170000000	USD
CY2020Q4	us-gaap	Deferred Credits And Other Liabilities Noncurrent DeferredCreditsAndOtherLiabilitiesNoncurrent	115000000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	22490000000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	22429000000	USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	965000000	USD
CY2020Q4	us-gaap	Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests	968000000	USD
CY2021Q4	us-gaap	Partners Capital PartnersCapital	11811000000	USD
CY2020Q4	us-gaap	Partners Capital PartnersCapital	12772000000	USD
CY2021Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	241000000	USD
CY2020Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	245000000	USD
CY2021Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	12052000000	USD
CY2020Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	13017000000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	35507000000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	36414000000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	3112000000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	-687000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1462000000	USD
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	70000000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	61000000	USD
CY2019	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	42000000	USD
CY2021	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	1287000000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	1377000000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold Depreciation And Amortization CostOfGoodsAndServicesSoldDepreciationAndAmortization	1254000000	USD
CY2021	us-gaap	Asset Impairment Charges AssetImpairmentCharges	42000000	USD
CY2020	us-gaap	Asset Impairment Charges AssetImpairmentCharges	2165000000	USD
CY2019	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1197000000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2000000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-2000000	USD
CY2021	mplx	Retirement Expenditures RetirementExpenditures	0	USD
CY2020	mplx	Retirement Expenditures RetirementExpenditures	0	USD
CY2019	mplx	Retirement Expenditures RetirementExpenditures	1000000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	13000000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-4000000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	6000000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	321000000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-936000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	290000000	USD
CY2021	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	508000000	USD
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	459000000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	525000000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	199000000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-62000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-17000000	USD
CY2021	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	24000000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	12000000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	9000000	USD
CY2021	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-45000000	USD
CY2020	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-3000000	USD
CY2019	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-2000000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	193000000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	36000000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-59000000	USD
CY2021	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-101000000	USD
CY2020	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-8000000	USD
CY2019	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	163000000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	2000000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	5000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-4000000	USD
CY2021	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	88000000	USD
CY2020	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	112000000	USD
CY2021	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	151000000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	100000000	USD
CY2021	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	26000000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	3000000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	9000000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4911000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4521000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4082000000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	529000000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1183000000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2408000000	USD
CY2021	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	0	USD
CY2020	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	0	USD
CY2019	us-gaap	Proceeds From Previous Acquisition ProceedsFromPreviousAcquisition	6000000	USD
CY2021	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	126000000	USD
CY2020	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	56000000	USD
CY2019	us-gaap	Proceeds From Sales Of Assets Investing Activities ProceedsFromSalesOfAssetsInvestingActivities	30000000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	266000000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	713000000	USD
CY2021	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	36000000	USD
CY2020	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	123000000	USD
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	18000000	USD
CY2021	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-8000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-4000000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-518000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1262000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3063000000	USD
CY2021	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	4175000000	USD
CY2020	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	6810000000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	9174000000	USD
CY2021	us-gaap	Repayments Of Debt RepaymentsOfDebt	5821000000	USD
CY2020	us-gaap	Repayments Of Debt RepaymentsOfDebt	6414000000	USD
CY2019	us-gaap	Repayments Of Debt RepaymentsOfDebt	7924000000	USD
CY2021	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	8493000000	USD
CY2020	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	6264000000	USD
CY2019	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	9313000000	USD
CY2021	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	7043000000	USD
CY2020	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	6858000000	USD
CY2019	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	8719000000	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	25000000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	20000000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	630000000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	33000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2021	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	3432000000	USD
CY2020	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	2884000000	USD
CY2019	us-gaap	Distribution Made To Limited Partner Cash Distributions Paid DistributionMadeToLimitedPartnerCashDistributionsPaid	2435000000	USD
CY2021	mplx	Total Numberof Reporting Units TotalNumberofReportingUnits	5
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	30000000	USD
CY2021	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	45000000	USD
CY2020	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	50000000	USD
CY2019	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	74000000	USD
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	39000000	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	37000000	USD
CY2021	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	95000000	USD
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2000000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-10000000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-13000000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-4395000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-3259000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1089000000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-2000000	USD
CY2012Q1	us-gaap	Limited Liability Company Or Limited Partnership Business Formation Date LimitedLiabilityCompanyOrLimitedPartnershipBusinessFormationDate	2012-03-27
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	15000000	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
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	0	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-70000000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	13000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	15000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	15000000	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
CY2019	mplx	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	2989000000	USD
CY2019	us-gaap	Partners Capital Account Contributions PartnersCapitalAccountContributions	441000000	USD
CY2019	us-gaap	Stockholders Equity Other StockholdersEquityOther	13000000	USD
CY2019Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	249000000	USD
CY2019Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	16613000000	USD
CY2020	mplx	Net Income Loss Including Portion Attributableto Noncontrolling Interest Excluding Portion Attributableto Temporary Equity NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingPortionAttributabletoTemporaryEquity	-768000000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	33000000	USD
CY2020	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	2959000000	USD
CY2021Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	241000000	USD
CY2020	us-gaap	Partners Capital Account Contributions PartnersCapitalAccountContributions	261000000	USD
CY2020	us-gaap	Stockholders Equity Change In Reporting Entity StockholdersEquityChangeInReportingEntity	-102000000	USD
CY2020	us-gaap	Stockholders Equity Other StockholdersEquityOther	5000000	USD
CY2020Q4	us-gaap	Partners Capital Attributable To Noncontrolling Interest PartnersCapitalAttributableToNoncontrollingInterest	245000000	USD
CY2020Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	13017000000	USD
CY2021	mplx	Net Income Loss Including Portion Attributableto Noncontrolling Interest Excluding Portion Attributableto Temporary Equity NetIncomeLossIncludingPortionAttributabletoNoncontrollingInterestExcludingPortionAttributabletoTemporaryEquity	3012000000	USD
CY2021	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	630000000	USD
CY2021	us-gaap	Partners Capital Account Exchanges And Conversions PartnersCapitalAccountExchangesAndConversions	-3000000	USD
CY2021	us-gaap	Partners Capital Account Distributions PartnersCapitalAccountDistributions	3512000000	USD
CY2021	us-gaap	Partners Capital Account Contributions PartnersCapitalAccountContributions	160000000	USD
CY2021	us-gaap	Stockholders Equity Other StockholdersEquityOther	2000000	USD
CY2021Q4	us-gaap	Partners Capital Including Portion Attributable To Noncontrolling Interest PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest	12052000000	USD
CY2019	mplx	Income Lossfrom Equity Method Investmentsfrom Asset Impairmentand Eliminationof Basis Differential IncomeLossfromEquityMethodInvestmentsfromAssetImpairmentandEliminationofBasisDifferential	42000000	USD
CY2012Q4	mplx	Initial Public Offering Completion Date InitialPublicOfferingCompletionDate	2012-10-31
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> – 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 </span>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 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; estimating revenues, expense accruals and capital expenditures; valuing AROs; recognizing share-based compensation expense; and determining liabilities, if any, for environmental and legal contingencies.
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2021Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2020Q4	us-gaap	Equity Method Investments EquityMethodInvestments	4036000000	USD
CY2019	mplx	Income Lossfrom Equity Method Investmentsfrom Asset Impairmentand Eliminationof Basis Differential IncomeLossfromEquityMethodInvestmentsfromAssetImpairmentandEliminationofBasisDifferential	42000000	USD
CY2021Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	31000000	USD
CY2019	mplx	Income Lossfrom Equity Method Investmentsfrom Asset Impairment IncomeLossfromEquityMethodInvestmentsfromAssetImpairment	28000000	USD
CY2019	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	14000000	USD
CY2021	us-gaap	Incentive Distribution Policy Managing Member Or General Partner Description IncentiveDistributionPolicyManagingMemberOrGeneralPartnerDescription	<span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Distributions</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%"> – 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 7 and 9, and subsequently allocated to the general partner and limited partner unitholders. Distributions, although earned, are not accrued as a liability until declared. The allocation of net income attributable to MPLX LP for purposes of calculating net income per limited partner unit is described below.</span>
CY2021Q4	us-gaap	Equity Method Investments EquityMethodInvestments	3981000000	USD
CY2020Q4	dei	Entity Number Of Employees EntityNumberOfEmployees	2050	employees
CY2021Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	644000000	USD
CY2020Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	677000000	USD
CY2021Q4	us-gaap	Due From Related Parties Noncurrent DueFromRelatedPartiesNoncurrent	1161000000	USD
CY2020Q4	us-gaap	Due From Related Parties Noncurrent DueFromRelatedPartiesNoncurrent	672000000	USD
CY2021Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	1780000000	USD
CY2020Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	356000000	USD
CY2021Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	302000000	USD
CY2020Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	283000000	USD
CY2020Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	1000000000	USD
CY2021	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	22907174	shares
CY2020	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	1473843	shares
CY2021	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	630000000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	33000000	USD
CY2021	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	27.52
CY2020	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	22.29
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CY2019	us-gaap	Distribution Made To Limited Partner Cash Distributions Declared DistributionMadeToLimitedPartnerCashDistributionsDeclared	2758000000	USD
CY2021	mplx	Earnings Per Unit Potentially Dilutive Units EarningsPerUnitPotentiallyDilutiveUnits	1000000	shares
CY2019	mplx	Earnings Per Unit Potentially Dilutive Units EarningsPerUnitPotentiallyDilutiveUnits	1000000	shares
CY2021	us-gaap	Net Income Loss NetIncomeLoss	3077000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-720000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1033000000	USD
CY2021	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-496000000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-3714000000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	-1725000000	USD
CY2021	us-gaap	Distribution Made To Limited Partner Cash Distributions Declared DistributionMadeToLimitedPartnerCashDistributionsDeclared	3573000000	USD
CY2021	us-gaap	Undistributed Earnings Loss Available To Common Shareholders Basic UndistributedEarningsLossAvailableToCommonShareholdersBasic	-496000000	USD
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CY2021	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	1027000000	shares
CY2021	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	1027000000	shares
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CY2020	us-gaap	Net Income Loss NetIncomeLoss	-720000000	USD
CY2020	us-gaap	Weighted Average Limited Partnership Units Outstanding WeightedAverageLimitedPartnershipUnitsOutstanding	1051000000	shares
CY2020	us-gaap	Weighted Average Limited Partnership Units Outstanding Diluted WeightedAverageLimitedPartnershipUnitsOutstandingDiluted	1051000000	shares
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
CY2021	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13000000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15000000	USD
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CY2020Q4	us-gaap	Assets Assets	36414000000	USD
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CY2020	us-gaap	Profit Loss ProfitLoss	-687000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	1462000000	USD
CY2021Q4	us-gaap	Energy Related Inventory Natural Gas Liquids EnergyRelatedInventoryNaturalGasLiquids	12000000	USD
CY2020Q4	us-gaap	Energy Related Inventory Natural Gas Liquids EnergyRelatedInventoryNaturalGasLiquids	5000000	USD
CY2021Q4	mplx	Natural Gas Or Natural Gas Liquids In Storage NaturalGasOrNaturalGasLiquidsInStorage	23000000	USD
CY2020Q4	mplx	Natural Gas Or Natural Gas Liquids In Storage NaturalGasOrNaturalGasLiquidsInStorage	13000000	USD
CY2021Q4	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	107000000	USD
CY2020Q4	us-gaap	Other Inventories Spare Parts OtherInventoriesSpareParts	100000000	USD
CY2021Q4	us-gaap	Inventory Gross InventoryGross	142000000	USD
CY2020Q4	us-gaap	Inventory Gross InventoryGross	118000000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	26546000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	26875000000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6504000000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	5657000000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	20042000000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	21218000000	USD
CY2021	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	42000000	USD
CY2020	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	174000000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	7700000000	USD
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	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
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1814000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	7657000000	USD
CY2021	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q4	us-gaap	Goodwill Goodwill	7657000000	USD
CY2021Q4	us-gaap	Goodwill Gross GoodwillGross	10798000000	USD
CY2021Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	3141000000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	7657000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	127000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	113000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1571000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	740000000	USD
CY2021Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	831000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1571000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	612000000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	959000000	USD
CY2020	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	177000000	USD
CY2020	us-gaap	Impairment Of Intangible Assets Finitelived ImpairmentOfIntangibleAssetsFinitelived	177000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	127000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	127000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	104000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	233000000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	831000000	USD
CY2021Q4	us-gaap	Derivative Average Forward Price DerivativeAverageForwardPrice	0.92
CY2021Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	18909000000	USD
CY2020Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	20536000000	USD
CY2021Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	102000000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	116000000	USD
CY2021Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	236000000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	281000000	USD
CY2021Q4	us-gaap	Debt Current DebtCurrent	499000000	USD
CY2020Q4	us-gaap	Debt Current DebtCurrent	764000000	USD
CY2021Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	18072000000	USD
CY2020Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	19375000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	502000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1502000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1451000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	1701000000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1501000000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	8021000000	USD
CY2021	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	2006000000	USD
CY2021	us-gaap	Revenues Revenues	10027000000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	6896000000	USD
CY2020	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	673000000	USD
CY2020	us-gaap	Revenues Revenues	7569000000	USD
CY2019	us-gaap	Noninterest Income NoninterestIncome	7041000000	USD
CY2019	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	2000000000	USD
CY2019	us-gaap	Revenues Revenues	9041000000	USD
CY2020	us-gaap	Contract With Customer Liability Change In Timeframe Performance Obligation Satisfied Revenue Recognized ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized	0	USD
CY2021	us-gaap	Contract With Customer Liability Change In Timeframe Performance Obligation Satisfied Revenue Recognized ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized	0	USD
CY2021Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	281000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P22Y
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1850000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1725000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1592000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	9957000000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	1507000000	USD
CY2021Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	3283000000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	812000000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	821000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	835000000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	4000000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	2000000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	1000000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	79000000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	87000000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	85000000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1000000	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2000000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	9000000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	5000000	USD
CY2021	mplx	Non Cash Net Transfers Of Materials And Supplies Inventories NonCashNetTransfersOfMaterialsAndSuppliesInventories	1000000	USD
CY2020	mplx	Non Cash Net Transfers Of Materials And Supplies Inventories NonCashNetTransfersOfMaterialsAndSuppliesInventories	0	USD
CY2019	mplx	Non Cash Net Transfers Of Materials And Supplies Inventories NonCashNetTransfersOfMaterialsAndSuppliesInventories	2000000	USD
CY2021	us-gaap	Sales Type Lease Selling Profit Loss SalesTypeLeaseSellingProfitLoss	0	USD
CY2020	us-gaap	Sales Type Lease Selling Profit Loss SalesTypeLeaseSellingProfitLoss	0	USD
CY2019	us-gaap	Sales Type Lease Selling Profit Loss SalesTypeLeaseSellingProfitLoss	21000000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	20000000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	17000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	26000000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	1000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	4000000	USD
CY2021	mplx	Fair Value Of Units Redeemed FairValueOfUnitsRedeemed	0	USD
CY2020	mplx	Fair Value Of Units Redeemed FairValueOfUnitsRedeemed	340000000	USD
CY2019	mplx	Fair Value Of Units Redeemed FairValueOfUnitsRedeemed	0	USD
CY2021	mplx	Fair Value Of Assets Contributed FairValueOfAssetsContributed	0	USD
CY2020	mplx	Fair Value Of Assets Contributed FairValueOfAssetsContributed	0	USD
CY2019	mplx	Fair Value Of Assets Contributed FairValueOfAssetsContributed	7722000000	USD
CY2021	mplx	Increase Decrease In Capital Accruals IncreaseDecreaseInCapitalAccruals	11000000	USD
CY2020	mplx	Increase Decrease In Capital Accruals IncreaseDecreaseInCapitalAccruals	-244000000	USD
CY2019	mplx	Increase Decrease In Capital Accruals IncreaseDecreaseInCapitalAccruals	-146000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	2000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	2000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	1000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	1000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	1000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	8000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	15000000	USD
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	6000000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	9000000	USD
CY2021Q2	us-gaap	Lessor Sales Type Lease Assumptions And Judgments Value Of Underlying Asset Amount LessorSalesTypeLeaseAssumptionsAndJudgmentsValueOfUnderlyingAssetAmount	421000000	USD
CY2021Q2	us-gaap	Sales Type Lease Lease Receivable SalesTypeLeaseLeaseReceivable	519000000	USD
CY2021Q2	us-gaap	Sales Type Lease Unguaranteed Residual Asset SalesTypeLeaseUnguaranteedResidualAsset	14000000	USD
CY2021Q2	us-gaap	Sales Type Lease Selling Profit Loss SalesTypeLeaseSellingProfitLoss	112000000	USD
CY2020Q1	us-gaap	Lessor Sales Type Lease Assumptions And Judgments Value Of Underlying Asset Amount LessorSalesTypeLeaseAssumptionsAndJudgmentsValueOfUnderlyingAssetAmount	171000000	USD
CY2020Q1	us-gaap	Sales Type Lease Lease Receivable SalesTypeLeaseLeaseReceivable	370000000	USD
CY2020Q1	us-gaap	Sales Type Lease Unguaranteed Residual Asset SalesTypeLeaseUnguaranteedResidualAsset	10000000	USD
CY2020Q1	us-gaap	Sales Type Lease Selling Profit Loss SalesTypeLeaseSellingProfitLoss	209000000	USD
CY2021	mplx	Operating Lease Lease Income Related Party OperatingLeaseLeaseIncomeRelatedParty	743000000	USD
CY2020	mplx	Operating Lease Lease Income Related Party OperatingLeaseLeaseIncomeRelatedParty	952000000	USD
CY2019	mplx	Operating Lease Lease Income Related Party OperatingLeaseLeaseIncomeRelatedParty	1196000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	845000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	770000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	718000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	682000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	646000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	1607000000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received LessorOperatingLeasePaymentsToBeReceived	5268000000	USD
CY2021Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	5552000000	USD
CY2020Q4	us-gaap	Property Subject To Or Available For Operating Lease Gross PropertySubjectToOrAvailableForOperatingLeaseGross	5947000000	USD
CY2021Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	2042000000	USD
CY2020Q4	us-gaap	Property Subject To Or Available For Operating Lease Accumulated Depreciation PropertySubjectToOrAvailableForOperatingLeaseAccumulatedDepreciation	2007000000	USD
CY2021Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	3510000000	USD
CY2020Q4	us-gaap	Property Subject To Or Available For Operating Lease Net PropertySubjectToOrAvailableForOperatingLeaseNet	3940000000	USD
CY2021Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	23000000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	17000000	USD
CY2020	us-gaap	Loss Contingency Damages Sought Value LossContingencyDamagesSoughtValue	187000000	USD
CY2020	us-gaap	Loss Contingency Damages Paid Value LossContingencyDamagesPaidValue	4000000	USD
CY2021Q4	us-gaap	Purchase Commitment Remaining Minimum Amount Committed PurchaseCommitmentRemainingMinimumAmountCommitted	116000000	USD

Files In Submission

Name	View Source	Status
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0001552000-22-000007-index.html	Edgar Link	pending
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mplx-20211231.xsd	Edgar Link	pending
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$MPLX
MPLX LP Stock $mplx

2022 Q1 Form 10-K Financial Statement

#000155200022000007 Filed on February 24, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MPLX MPLX LP Stock $mplx

2022 Q1 Form 10-K Financial Statement

#000155200022000007 Filed on February 24, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MPLX
MPLX LP Stock $mplx