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Equity Method Investments - Whistler Joint Venture Transaction - (Details) - USD ($) $ in Millions			3 Months Ended		9 Months Ended
		May 29, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	May 28, 2024
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposition of stock in subsidiary or equity method investee	[1]		$ 0	$ 106	$ 151	$ 106
Investments - redemptions, repayments, return of capital and sales proceeds					$ 141	$ 270
Whistler Pipeline, LLC | MPLX
Schedule of Equity Method Investments [Line Items]
Ownership percentage							37.50%
WPC Parent, LLC
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposition of stock in subsidiary or equity method investee		$ 151
Investments - redemptions, repayments, return of capital and sales proceeds		$ 134
WPC Parent, LLC | Enbridge Inc.
Schedule of Equity Method Investments [Line Items]
Ownership percentage		19.00%
WPC Parent, LLC | MPLX
Schedule of Equity Method Investments [Line Items]
Ownership percentage		30.40%
[1] The first nine months of 2024 includes the gain from the Whistler Joint Venture Transaction (as defined in Note 13). 2023 includes the gain on the sale of our interest in South Texas Gateway Terminal LLC. See Note 13 for additional information.

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