Related Party Transactions - Promissory Notes with our General Partner (Details) $ in Millions, $ in Millions	3 Months Ended	13 Months Ended
Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 CAD ($)	Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Related party interest expense	$ 95	$ 98
8.25% note due April 2027 \| PAGP \| General Partner
Related Party Transaction [Line Items]
Related party note receivable	369		$ 369	$ 500	$ 379
Related party note payable	369		$ 369	$ 500	379
Related party note payable and receivable interest rate (as a percent)			8.25%
Related party interest receivable	3		$ 3		10
Related party interest payable	3		$ 3		$ 10
Related party interest income	8	3
Related party interest expense	$ 8	$ 3

Amount of the cost of borrowed funds accounted for as interest expense.

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