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Derivatives Financial Instruments - Derivative Income Statement Location (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Derivative [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 21 | $ 4 | $ (50) | $ (3)
Commodity Contract [Member] | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 2 | $ 0 | $ (6) | $ 0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue from Contract with Customer, Excluding Assessed Tax - Third parties | Revenue from Contract with Customer, Excluding Assessed Tax - Third parties | Revenue from Contract with Customer, Excluding Assessed Tax - Third parties | Revenue from Contract with Customer, Excluding Assessed Tax - Third parties
Commodity Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 15 | $ 0 | $ (33) | $ 0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue from Contract with Customer, Excluding Assessed Tax - Third parties | Revenue from Contract with Customer, Excluding Assessed Tax - Third parties | Revenue from Contract with Customer, Excluding Assessed Tax - Third parties | Revenue from Contract with Customer, Excluding Assessed Tax - Third parties
Embedded Derivative [Member] | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 4 | $ 4 | $ (11) | $ (3)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Purchased product costs | Purchased product costs | Purchased product costs | Purchased product costs
Income Statement Location [Axis]: us-gaap:CostDirectMaterial | Embedded Derivative [Member] | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Realized gain (loss) | $ (3) | $ (3) | $ (5) | $ (6)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | 7 | 7 | (6) | 3
Income Statement Location [Axis]: mplx:RevenueFromContractWithCustomerExcludingAssessedTaxThirdParties | Commodity Contract [Member] | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Realized gain (loss) | (3) | 0 | (4) | 0
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | 5 | 0 | (2) | 0
Income Statement Location [Axis]: mplx:RevenueFromContractWithCustomerExcludingAssessedTaxThirdParties | Commodity Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge |  |  |  |
Derivative [Line Items] |  |  |  |
Realized gain (loss) | (17) | 0 | (21) | 0
Unrealized Gain (Loss) on Derivatives and Commodity Contracts | $ 32 | $ 0 | $ (12) | $ 0

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- Definition Amount of realized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-5A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-18 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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