Partners' Capital and Distributions - PAA Common Unit Distributions (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended		6 Months Ended
	Aug. 14, 2025	May 15, 2025	Feb. 14, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Partners' Capital and Distributions [Line Items]
Total distributions paid				$ 418	$ 383	$ 874	$ 770
Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid		$ 267	$ 267
Distributions per common unit, paid (usd per unit)		$ 0.38	$ 0.38
Forecast | Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid	$ 267
Distributions per common unit, paid (usd per unit)	$ 0.38
Public | Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid		$ 179	$ 179
Public | Forecast | Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid	$ 179
AAP | Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid		$ 88	$ 88
AAP | Forecast | Cash Distribution | Common Units | PAA
Partners' Capital and Distributions [Line Items]
Total distributions paid	$ 88