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Debt (MPC Senior Notes) (Details) - MPC: - Senior notes - USD ($) $ in Millions	May 01, 2025	Sep. 16, 2024	Feb. 10, 2025
Debt Instrument [Line Items]
Debt instrument, face amount			$ 2,000
Senior notes, 5.150% due March 2030
Debt Instrument [Line Items]
Debt instrument, face amount			1,100
Senior notes, 5.700% due March 2035
Debt Instrument [Line Items]
Debt instrument, face amount			$ 900
Senior notes, 3.625% due September 2024
Debt Instrument [Line Items]
Repayments of debt		$ 750
Senior notes, 4.700% due May 2025
Debt Instrument [Line Items]
Repayments of debt	$ 1,250

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