Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2023 |
Sep. 30, 2022 |
Sep. 30, 2023 |
Sep. 30, 2022 |
Aug. 02, 2022 |
Nov. 02, 2020 |
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| Units acquired, average cost per unit | $ 139.84 | [1] | $ 92.54 | $ 127.09 | $ 88.07 | ||||
| Stock repurchase program, remaining authorized repurchase amount | $ 4,310 | $ 4,310 | |||||||
| Share Repurchase Authorization August 2022 | |||||||||
| Stock repurchase program, authorized amount | $ 5,000 | ||||||||
| MPLX LP | |||||||||
| Units repurchased, units | 0 | 6 | 0 | 10 | |||||
| Units repurchased, value | $ 0 | $ 180 | $ 0 | $ 315 | |||||
| Units acquired, average cost per unit | $ 0 | $ 31.65 | $ 0 | $ 31.98 | |||||
| Stock repurchase program, remaining authorized repurchase amount | $ 846 | $ 846 | |||||||
| MPLX LP | Share Repurchase Authorization November 2020 | |||||||||
| Stock repurchase program, authorized amount | $ 1,000 | ||||||||
| MPLX LP | Share Repurchase Authorization August 2022 | |||||||||
| Stock repurchase program, authorized amount | $ 1,000 | ||||||||
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