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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