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Debt - MPC Senior Notes (Details) - Senior notes, 2.700% due December 2018 $ in Millions | Mar. 15, 2018 USD ($)
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Debt Instrument [Line Items] |
Repayments of long-term debt | $ 600.0
Make whole premium | $ 2.5

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- Definition Make Whole Premium + References No definition available. + Details
Name: | mpc_MakeWholePremium
Namespace Prefix: | mpc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=mpc_SeniorNotesDueDecember2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |