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Related Party Transactions - Narrative (Details) $ in Millions, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Feb. 28, 2025 CAD ($)	Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items]
Investments in related party notes				$ 330	$ 629
Proceeds from the issuance of related party notes				330	629
Related party interest expense		$ 135	$ 113	395	318
PAGP | Notes Due In June 2035 at 5.75 Percent | General Partner
Related Party Transaction [Line Items]
Related party note receivable	$ 330					$ 473
Related party note payable	$ 330					$ 473
Related party note payable and receivable interest rate (as a percent)	5.75%
Investments in related party notes	$ 330
Proceeds from the issuance of related party notes	$ 330
PAGP | Related Party Promissory Notes | General Partner
Related Party Transaction [Line Items]
Related party note receivable		1,321		1,321			$ 948
Related party note payable		1,321		1,321			948
Related party interest receivable		7		7			27
Related party interest payable		7		7			$ 27
Related party interest expense		23	16	65	31
Related party interest income		$ 23	$ 16	$ 65	$ 31

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