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Debt (MPLX Senior Notes) (Details) - MPLX: - Senior notes - USD ($) $ in Millions	Apr. 09, 2025	Feb. 18, 2025	Mar. 10, 2025
Debt Instrument [Line Items]
Debt instrument, face amount			$ 2,000
Senior notes, 4.000% due February 2025
Debt Instrument [Line Items]
Repayments of debt		$ 500
Senior notes, 5.400% due April 2035
Debt Instrument [Line Items]
Debt instrument, face amount			1,000
Senior notes, 5.950% due April 2055
Debt Instrument [Line Items]
Debt instrument, face amount			$ 1,000
Senior notes, 4.875% due June 2025
Debt Instrument [Line Items]
Repayments of debt	$ 1,189
Senior notes, 4.875% due June 2025 | MarkWest
Debt Instrument [Line Items]
Repayments of debt	$ 11

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