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Related Party Transactions - Promissory Notes with our General Partner (Details) $ in Millions, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended		19 Months Ended
	Jul. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Jul. 31, 2024 CAD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 CAD ($)
Related Party Transaction [Line Items]
Proceeds from the issuance of related party notes				$ 629
Investments in related party notes				629
Related party interest expense		$ 113	$ 97	318	$ 290
PAGP | Related Party Promissory Notes | General Partner
Related Party Transaction [Line Items]
Related party note receivable		1,011		1,011		$ 1,011		$ 379
Related party note payable		1,011		1,011		1,011		379
Related party interest receivable		11		11		11		10
Related party interest payable		11		11		$ 11		$ 10
Related party interest income		16	8	31	18
Related party interest expense		$ 16	$ 8	$ 31	$ 18
PAGP | 8.25% note due April 2027 | General Partner
Related Party Transaction [Line Items]
Related party note receivable									$ 370	$ 500
Related party note payable									$ 370	$ 500
Related party note payable and receivable interest rate (as a percent)						8.25%
PAGP | 6.50% note due September 2034 | General Partner
Related Party Transaction [Line Items]
Related party note receivable	$ 629						$ 865
Related party note payable	629						$ 865
Related party note payable and receivable interest rate (as a percent)		6.50%
Proceeds from the issuance of related party notes	629
Investments in related party notes	$ 629

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