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Net Income/(Loss) Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Basic and Diluted Net Income/(Loss) per Common Unit      
Net income/(loss) attributable to PAA $ 1,037 $ 593 $ (2,590)
Amounts allocated to participating securities (5) (2) (2)
Net income/(loss) allocated to common unitholders — Basic 831 393 (2,790)
Net income/(loss) allocated to common unitholders — Diluted $ 831 $ 393 $ (2,790)
Weighted Average | Equity-indexed Compensation Plan Award      
Net Income Per Common Unit      
Dilutive equity-indexed compensation plan awards (in units) 2.0 0.5 0.3
Series A Preferred Units      
Basic and Diluted Net Income/(Loss) per Common Unit      
Distributions to preferred unitholders $ (149) $ (149) $ (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) 71.0 71.0 71.0
Series B Preferred Units      
Basic and Diluted Net Income/(Loss) per Common Unit      
Distributions to preferred unitholders $ (52) $ (49) $ (49)
Common Units      
Basic and Diluted Net Income/(Loss) per Common Unit      
Basic weighted average common units outstanding (in units) 701.0 716.0 728.0
Diluted weighted average common units outstanding (in units) 701.0 716.0 728.0
Basic net income/(loss) per common unit (in dollars per unit) $ 1.19 $ 0.55 $ (3.83)
Diluted net income/(loss) per common unit (in dollars per unit) $ 1.19 $ 0.55 $ (3.83)