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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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The percentage rate used to calculate dividend payments on preferred stock.

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Series B Preferred Units (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 15, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Partners' Capital Account, Distributions		$ 4,062	$ 3,603	$ 3,243
Series B Preferred Stock [Member]
Partners' Capital Account, Units, Redeemed	600,000
Preferred Stock, Dividend Rate, Percentage	6.875%
Preferred Stock, Redemption Price Per Share	$ 1,000
Preferred Stock, Redemption Terms	MPLX exercised its right to redeem all 600,000 units of 6.875 percent Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units (the “Series B preferred units”). MPLX paid unitholders the Series B preferred unit redemption price of $1,000 per unit.
Partners' Capital Account, Distributions	$ 21
Distribution date	Feb. 15, 2023