XML 104 R94.htm IDEA: XBRL DOCUMENT v3.19.3

Debt - MPC 364-Day Bank Revolving Credit Facility (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jul. 26, 2019
MPC 364-day revolver due September 2020
Debt Instrument [Line Items]
Current borrowing capacity		$ 1,000
MPC 364-day revolver due September 2019
Debt Instrument [Line Items]
Current borrowing capacity	$ 1,000

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=mpc_MPC364DayRevolverdueSeptember2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=mpc_MPC364DayRevolverdueSeptember2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: