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Leases Lessee Narrative (Details)	9 Months Ended
	Sep. 30, 2019
Minimum
Term of agreements	1 year
Renewal term options	1 year
Maximum
Term of agreements	60 years
Renewal term options	50 years

X

- Definition

Renewal Term Agreement

+ References

No definition available.

+ Details

Name:	mpc_RenewalTermAgreement
Namespace Prefix:	mpc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term Of Agreements

+ References

No definition available.

+ Details

Name:	mpc_TermOfAgreements
Namespace Prefix:	mpc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: