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Related Party Transactions - Narrative (Details) $ in Millions, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2025 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Feb. 28, 2025 CAD ($)	Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items]
Investments in related party notes				$ 330
Proceeds from the issuance of related party notes				330
Related party interest expense		$ 133	$ 111	260	$ 205
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		1,349		1,349			$ 948
Related party note payable		1,349		1,349			948
Related party interest receivable		32		32			27
Related party interest payable		32		32			$ 27
Related party interest expense		23	7	43	15
Related party interest income		$ 23	$ 7	$ 43	$ 15

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