Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | |||||
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Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Aug. 05, 2025 |
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| Units acquired, average cost per unit | [1] | $ 357.68 | $ 174.32 | $ 289.71 | $ 153.83 | ||
| Stock repurchase program, remaining authorized repurchase amount | $ 3,120 | $ 3,120 | |||||
| MPLX LP | |||||||
| Units repurchased, units | 1 | 2 | 3 | 6 | |||
| Units repurchased, value | $ 50 | $ 100 | $ 150 | $ 300 | |||
| Units acquired, average cost per unit | $ 58.69 | $ 50.86 | $ 57.09 | $ 51.20 | |||
| Stock repurchase program, remaining authorized repurchase amount | $ 970 | $ 970 | |||||
| MPLX LP | Share Repurchase Authorization August 2025 | |||||||
| Stock repurchase program, authorized amount | $ 1,000 | ||||||
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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. No definition available.
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