Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Debt (MPLX Senior Notes) (Details) - MPLX: - Senior notes - USD ($) $ in Millions	Mar. 02, 2026	Feb. 12, 2026	Aug. 11, 2025
Debt Instrument [Line Items]
Debt instrument, face amount			$ 4,500
Senior Notes Due April 2036
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,000
Senior Notes Due April 2056
Debt Instrument [Line Items]
Debt instrument, face amount		$ 500
Senior Notes Due March 2026
Debt Instrument [Line Items]
Repayments of debt	$ 1,500