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Related Party Transactions - Promissory Notes with our General Partner (Details) $ in Millions, $ in Millions	3 Months Ended		4 Months Ended	6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 CAD ($)
Related Party Transaction [Line Items]
Related party interest expense	$ 95	$ 99		$ 193	$ 206
8.25% note due April 2027 \| PAGP \| General Partner
Related Party Transaction [Line Items]
Related party note receivable	378		$ 378	378		$ 500
Related party note payable	378		$ 378	378		$ 500
Related party note payable and receivable interest rate (as a percent)			8.25%
Related party interest receivable	10		$ 10	10
Related party interest payable	10		$ 10	10
Related party interest income	7			10
Related party interest expense	$ 7			$ 10