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Debt (MPLX Bank Revolving Credit Facility) (Details) - MPLX LP: - USD ($) $ in Millions	Jul. 07, 2022	Jun. 30, 2022
MPLX bank revolving credit facility due July 2024
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 3,500
MPLX bank revolving credit facility due July 2027 | Subsequent Event
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 2,000
Description of variable rate basis	at either the Adjusted Term SOFR or the Alternate Base Rate, both as defined in the MPLX Credit Agreement, plus an applicable margin
MPLX bank revolving credit facility due July 2027 | Letter of Credit | Subsequent Event
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 150

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Description of reference rate used for variable rate of debt instrument.

+ References

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- Definition

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- 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 https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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