XML 107 R56.htm IDEA: XBRL DOCUMENT v3.19.3

Description of the Business and Basis of Presentation (Details) bbl / d in Millions	9 Months Ended
	Sep. 30, 2019 Store bbl / d refinery
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Capacity | bbl / d	3
Number of refineries | refinery	16
Number of branded outlets	6,800
Number of retail transportation fuel and convenience stores	3,930
Number of direct dealer locations	1,070

X

- Definition

Capacity

+ References

No definition available.

+ Details

Name:	mpc_Capacity
Namespace Prefix:	mpc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of Refineries

+ References

No definition available.

+ Details

Name:	mpc_NumberofRefineries
Namespace Prefix:	mpc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of branded outlets

+ References

No definition available.

+ Details

Name:	mpc_Numberofbrandedoutlets
Namespace Prefix:	mpc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of direct dealer locations

+ References

No definition available.

+ Details

Name:	mpc_Numberofdirectdealerlocations
Namespace Prefix:	mpc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of retail transportation fuel and convenience stores

+ References

No definition available.

+ Details

Name:	mpc_Numberofretailtransportationfuelandconveniencestores
Namespace Prefix:	mpc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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