Partners' Capital and Distributions - Subsidiary Distributions (Details) - Cash Distribution - Series A Preferred Units - PAA - USD ($) $ / shares in Units, $ in Millions	Aug. 14, 2025	May 15, 2025	Feb. 14, 2025
Partners' Capital and Distributions [Line Items]
Preferred unit distribution amount		$ 36	$ 36
Preferred unit distribution amount (usd per share)		$ 0.615	$ 0.615
Forecast
Partners' Capital and Distributions [Line Items]
Preferred unit distribution amount	$ 36
Preferred unit distribution amount (usd per share)	$ 0.615