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Master Limited Partnership (Details)	Jun. 30, 2022
MPLX | Marathon Petroleum Corporation
MPC's partnership interest in MLP (in percentage)	64.00%

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	srt_OwnershipAxis=mpc_MPLXLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	dei_LegalEntityAxis=mpc_MarathonPetroleumCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: