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Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Aug. 02, 2022
Units acquired, average cost per unit | [1] | $ 170.99 | $ 139.84 | $ 175.20 | $ 127.09 |
Stock repurchase program, remaining authorized repurchase amount |  | $ 4,040 |  | $ 4,040 |  |
MPLX LP |  |  |  |  |  |
Units repurchased, units |  | 2 | 0 | 6 | 0 |
Units repurchased, value |  | $ 76 | $ 0 | $ 226 | $ 0 |
Units acquired, average cost per unit |  | $ 42.89 | $ 0 | $ 41.32 | $ 0 |
Stock repurchase program, remaining authorized repurchase amount |  | $ 620 |  | $ 620 |  |
MPLX LP | Share Repurchase Authorization August 2022 |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | $ 1,000
[1] | The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.

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