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Net Income Per Common Unit - Schedule of Computation of Basic and Diluted Net Income per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Basic and Diluted Net Income per Common Unit      
Net income attributable to PAA $ 772 $ 1,230 $ 1,037
Amounts allocated to participating securities (10) (10) (5)
Other 5 5  
Net income allocated to common unitholders — Basic 514 976 831
Net income allocated to common unitholders — Diluted 514 976 831
Series A Preferred Units      
Basic and Diluted Net Income per Common Unit      
Distributions to preferred unitholders $ (175) $ (173) $ (149)
Series A Preferred Units | Weighted Average      
Net Income Per Common Unit      
Antidilutive securities excluded from computation of net income per common unit (in units) 71 71 71
Series B Preferred Units      
Basic and Diluted Net Income per Common Unit      
Distributions to preferred unitholders $ (78) $ (76) $ (52)
Common Units      
Basic and Diluted Net Income per Common Unit      
Basic weighted average common units outstanding (in units) 702 699 701
Diluted weighted average common units outstanding (in units) 702 699 701
Basic net income per common unit (in dollars per unit) $ 0.73 $ 1.40 $ 1.19
Diluted net income per common unit (in dollars per unit) $ 0.73 $ 1.40 $ 1.19