Equity Method Investments - Whistler Joint Venture Transaction - (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
	May 29, 2024	Jun. 30, 2024	[1]	Jun. 30, 2023	Jun. 30, 2024		Jun. 30, 2023	May 28, 2024
Schedule of Equity Method Investments [Line Items]
Gain (loss) on disposition of stock in subsidiary or equity method investee		$ 151		$ 0	$ 151	[1]	$ 0
Investments - redemptions, repayments, return of capital and sales proceeds					$ 134		$ 0
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] Gain from the Whistler Joint Venture Transaction (as defined in Note 13). See Note 13 for additional information.