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Debt (Summary of Outstanding Borrowings Interest Rates and Table Due Dates) (Details) - Senior Notes	12 Months Ended
	Dec. 31, 2025	Apr. 09, 2025	Feb. 18, 2025	May 20, 2024
Senior Note Due June 2034
Debt Instrument [Line Items]
Interest rate, stated percentage				5.50%
MPLX LP | Senior Notes Due February 2025 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%		4.00%
Debt Instrument, Maturity Date	Feb. 15, 2025
MPLX LP | Senior Notes Due June 2025 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.875%	4.875%
Debt Instrument, Maturity Date	Jun. 01, 2025
MPLX LP | Senior Notes Due March 2026 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	1.75%
Debt Instrument, Maturity Date	Mar. 01, 2026
MPLX LP | Senior Notes Due March 2027 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.125%
Debt Instrument, Maturity Date	Mar. 01, 2027
MPLX LP | Senior Notes Due December 2027 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.25%
Debt Instrument, Maturity Date	Dec. 01, 2027
MPLX LP | Senior Notes Due March 2028 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%
Debt Instrument, Maturity Date	Mar. 15, 2028
MPLX LP | Senior Notes Due February 2029 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.80%
Debt Instrument, Maturity Date	Feb. 15, 2029
MPLX LP | Senior Notes Due August 2030 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	2.65%
Debt Instrument, Maturity Date	Aug. 15, 2030
MPLX LP | Senior Note Due September 2032
Debt Instrument [Line Items]
Interest rate, stated percentage	4.95%
Debt Instrument, Maturity Date	Sep. 01, 2032
MPLX LP | Senior Note Due March 2033
Debt Instrument [Line Items]
Interest rate, stated percentage	5.00%
Debt Instrument, Maturity Date	Mar. 01, 2033
MPLX LP | Senior Note Due June 2034
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Debt Instrument, Maturity Date	Jun. 01, 2034
MPLX LP | Senior Notes Due April 2038 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.50%
Debt Instrument, Maturity Date	Apr. 15, 2038
MPLX LP | 5.200% senior notes due March 2047
Debt Instrument [Line Items]
Interest rate, stated percentage	5.20%
Debt Instrument, Maturity Date	Mar. 01, 2047
MPLX LP | Senior Notes Due December 2047 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.20%
Debt Instrument, Maturity Date	Dec. 01, 2047
MPLX LP | Senior Notes Due April 2048 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.70%
Debt Instrument, Maturity Date	Apr. 15, 2048
MPLX LP | Senior Notes Due November 2049 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.50%
Debt Instrument, Maturity Date	Feb. 15, 2049
MPLX LP | Senior Note Due March 2052 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.95%
Debt Instrument, Maturity Date	Mar. 14, 2052
MPLX LP | Senior Note Due March 2053
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Debt Instrument, Maturity Date	Mar. 01, 2053
MPLX LP | Senior Notes Due April 2058 [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	4.90%
Debt Instrument, Maturity Date	Apr. 15, 2058

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