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Related Party Transactions - Promissory Notes with our General Partner (Details) $ in Millions, $ in Millions	3 Months Ended		7 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 CAD ($)
Related Party Transaction [Line Items]
Related party interest expense	$ 97	$ 99		$ 290	$ 305
8.25% note due April 2027 \| PAGP \| General Partner
Related Party Transaction [Line Items]
Related party note receivable	369		$ 369	369		$ 500
Related party note payable and receivable interest rate (as a percent)			8.25%
Related party interest receivable	3		$ 3	3
Related party interest payable	3		3	3
Related party interest income	8			18
Related party interest expense	8			18
Related party note payable	$ 369		$ 369	$ 369		$ 500