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

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The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the 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 Redemption (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Feb. 15, 2023	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
Equity, Class of Treasury Stock [Line Items]
Partners' Capital Account, Distributions		$ 879	$ 875	$ 864	$ 787	$ 785	$ 808
Series B Preferred Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Preferred Stock, Redemption Terms	MPLX exercised its right to redeem all 600,000 outstanding 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, Units, Redeemed	600,000
Dividend rate, percentage	6.875%
Preferred Stock, Redemption Price Per Share	$ 1,000
Partners' Capital Account, Distributions	$ 21
Distribution date	Feb. 15, 2023