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Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Nov. 02, 2020
Units acquired, average cost per unit | $ 95.46 | $ 63.00 | $ 85.31 | $ 63.00 |
Stock repurchase program, remaining authorized repurchase amount | $ 4,170 |  | $ 4,170 |  |
MPLX LP |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 1,000
Units repurchased, units | 1 | 6 | 4 | 12 |
Units repurchased, value | $ 35 | $ 155 | $ 135 | $ 310 |
Units acquired, average cost per unit | $ 33.74 | $ 27.40 | $ 32.48 | $ 26.02 |
Stock repurchase program, remaining authorized repurchase amount | $ 202 |  | $ 202 |  |

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