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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

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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