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Net Income/(Loss) Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Basic and Diluted Net Income/(Loss) per Common Unit        
Net income/(loss) attributable to PAA $ 384 $ (59) $ 774 $ 143
Amounts allocated to participating securities (2) (1) (4) (1)
Net income/(loss) allocated to common unitholders - Basic 333 (109) 621 (7)
Net income/(loss) allocated to common unitholders - Diluted $ 333 $ (109) $ 621 $ (7)
Equity-indexed Compensation Plan Award | Weighted average        
Net Income/(Loss) Per Common Unit        
Antidilutive securities excluded from computation of net income per common unit (units)   0.6   0.5
Dilutive equity-indexed compensation plan awards (units) 2.4   1.3  
Series A Preferred Units        
Basic and Diluted Net Income/(Loss) per Common Unit        
Distributions to preferred unitholders $ (37) $ (37) $ (112) $ (112)
Series A Preferred Units | Weighted average        
Net Income/(Loss) Per Common Unit        
Antidilutive securities excluded from computation of net income per common unit (units) 71.0 71.0 71.0 71.0
Series B Preferred Units        
Basic and Diluted Net Income/(Loss) per Common Unit        
Distributions to preferred unitholders $ (12) $ (12) $ (37) $ (37)
Common Units        
Basic and Diluted Net Income/(Loss) per Common Unit        
Basic weighted average common units outstanding (units) 698.0 715.0 702.0 719.0
Diluted weighted average common units outstanding (units) 698.0 715.0 702.0 719.0
Basic net income/(loss) per common unit (usd per unit) $ 0.48 $ (0.15) $ 0.89 $ (0.01)
Diluted net income/(loss) per common unit (usd per unit) $ 0.48 $ (0.15) $ 0.89 $ (0.01)