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Debt - MPLX Term Loan (Details) - MPLX term loan facility $ in Billions	Sep. 26, 2019 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 1
Description of variable rate basis	at either the Adjusted LIBO Rate (as defined in the term loan agreement) plus a margin or the Alternate Base Rate (as defined in the term loan agreement) plus a margin
Maturity date	Sep. 26, 2021
Number of prior quarterly reporting periods covenant	4
Maximum
Debt Instrument [Line Items]
Covenant ratio debt to Ebitda	5.0
Covenant ratio debt to Ebitda post acquisition	5.5

X

- Definition

Covenant Ratio Debt To Ebitda

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Covenant Ratio Debt To Ebitda Post Acquisition

+ References

No definition available.

+ Details

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X

- Definition

Number Of Prior Quarterly Reporting Periods Covenant

+ References

No definition available.

+ Details

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Namespace Prefix:	mpc_
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Period Type:	instant

X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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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.

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X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the 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

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Period Type:	instant

X

- Details

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