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Related Party Agreements and Transactions (Deferred Revenue from Related Parties) (Details) - MPC - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Related Party Transaction [Line Items] |  |
Deferred revenue related parties | $ 94 | $ 86
Minimum Committed Volume Contracts [Member] |  |
Related Party Transaction [Line Items] |  |
Deferred revenue related parties | 44 | 53
Reimbursable Projects |  |
Related Party Transaction [Line Items] |  |
Deferred revenue related parties | $ 50 | $ 33

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- Definition Deferred revenue with related parties, including both current and non current portions. + References No definition available. + Details
Name: | mpc_DeferredRevenueRelatedParties
Namespace Prefix: | mpc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mpc_MarathonPetroleumCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=mpc_MinimumCommittedVolumeContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DeferredRevenueArrangementTypeAxis=mpc_ReimbursableProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |