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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.

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

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Number of shares that have been repurchased and retired during the period.

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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).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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