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Subsequent Events (Details) - Senior Notes - USD ($) $ in Millions	Mar. 01, 2026	Feb. 12, 2026	May 20, 2024	Dec. 31, 2025	Aug. 11, 2025	Dec. 31, 2024
Subsequent Event [Line Items]
Debt Instrument, Face Amount					$ 4,500
Senior Note Due June 2034
Subsequent Event [Line Items]
Debt Instrument, Issuance Date			May 20, 2024
Debt Instrument, Face Amount			$ 1,650
Interest rate, stated percentage			5.50%
Percent of par			98.778%
Senior Note Due June 2034 | MPLX LP [Member]
Subsequent Event [Line Items]
Interest rate, stated percentage				5.50%
Long-term debt, gross				$ 1,650		$ 1,650
Senior Notes Due March 2026 [Member] | MPLX LP [Member]
Subsequent Event [Line Items]
Interest rate, stated percentage				1.75%
Long-term debt, gross				$ 1,500		$ 1,500
Subsequent Event | Senior Notes Due April 2036
Subsequent Event [Line Items]
Debt Instrument, Issuance Date		Feb. 12, 2026
Debt Instrument, Face Amount		$ 1,000
Interest rate, stated percentage		5.30%
Percent of par		99.678%
Subsequent Event | Senior Notes Due April 2056
Subsequent Event [Line Items]
Debt Instrument, Issuance Date		Feb. 12, 2026
Debt Instrument, Face Amount		$ 500
Interest rate, stated percentage		6.10%
Percent of par		98.453%
Subsequent Event | Senior Notes Due March 2026 [Member] | MPLX LP [Member]
Subsequent Event [Line Items]
Interest rate, stated percentage	1.75%
Repayments of Debt	$ 1,500

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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