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Commitments and Contingencies - Contractual Commitments and Contingencies (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($)
Loss Contingencies [Line Items] |
Contractual commitments to acquire property, plant and equipment and advance funds to equity method investees | $ 722
Galveston Bay Refinery and Related Assets |
Loss Contingencies [Line Items] |
Contractual commitments to acquire property, plant and equipment and advance funds to equity method investees | $ 131

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=mpc_GalvestonBayRefineryAndRelatedAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |