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Lease Operations Lease Operations (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Operating lease revenue, excluding executory costs	$ 928	$ 601	$ 586
Operating leases of lessor contingent rentals received	$ 9	$ 9	$ 7

X

- Definition

Represents the contingent lease payments received under the contingent rental provisions.

+ References

No definition available.

+ Details

Name:	mpc_OperatingLeasesOfLessorContingentRentalsReceived
Namespace Prefix:	mpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Operating lease revenue, excluding executory costs

+ References

No definition available.

+ Details

Name:	mpc_Operatingleaserevenueexcludingexecutorycosts
Namespace Prefix:	mpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration