Partners' Capital and Distributions - PAA Common Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended		9 Months Ended
	Nov. 14, 2025	Aug. 14, 2025	May 15, 2025	Feb. 14, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Partners' Capital and Distributions [Line Items]
Total distributions paid					$ 431	$ 399	$ 1,304	$ 1,168
Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid		$ 267	$ 267	$ 267
Distributions per common unit, paid (in usd per unit)		$ 0.38	$ 0.38	$ 0.38
Cash Distribution | Common Units | PAA | Forecast
Partners' Capital and Distributions [Line Items]
Total distributions paid	$ 268
Distributions per common unit, paid (in usd per unit)	$ 0.38
Cash Distribution | Class A Shares
Partners' Capital and Distributions [Line Items]
Distributions per common unit, paid (in usd per unit)		$ 0.38	$ 0.38	$ 0.38
Cash Distribution | Class A Shares | Forecast
Partners' Capital and Distributions [Line Items]
Distributions per common unit, paid (in usd per unit)	$ 0.38
Public | Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid		$ 179	$ 179	$ 179
Public | Cash Distribution | Common Units | PAA | Forecast
Partners' Capital and Distributions [Line Items]
Total distributions paid	$ 180
AAP | Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid		$ 88	$ 88	$ 88
AAP | Cash Distribution | Common Units | PAA | Forecast
Partners' Capital and Distributions [Line Items]
Total distributions paid	$ 88