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Net Income/(Loss) Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic and Diluted Net Income/(Loss) per Common Unit    
Net income/(loss) attributable to PAA $ 422 $ (2,847)
Distributions to participating securities (1) (1)
Other (1)  
Net income/(loss) allocated to common unitholders $ 371 $ (2,897)
Equity-indexed Compensation Plan Award    
Net Income/(Loss) Per Common Unit    
Dilutive equity-indexed compensation plan awards (units) 0  
Equity-indexed Compensation Plan Award | Weighted average    
Net Income/(Loss) Per Common Unit    
Antidilutive securities excluded from computation of net income/(loss) per common unit (units)   1
Series A Preferred Units    
Basic and Diluted Net Income/(Loss) per Common Unit    
Distributions to preferred unitholders $ (37) $ (37)
Series A Preferred Units | Weighted average    
Net Income/(Loss) Per Common Unit    
Antidilutive securities excluded from computation of net income/(loss) per common unit (units) 71 71
Series B Preferred Units    
Basic and Diluted Net Income/(Loss) per Common Unit    
Distributions to preferred unitholders $ (12) $ (12)
Common Units    
Basic and Diluted Net Income/(Loss) per Common Unit    
Basic weighted average common units outstanding (units) 722 728
Diluted weighted average common units outstanding (units) 722 728
Basic net income/(loss) per common unit (usd per unit) $ 0.51 $ (3.98)
Diluted net income/(loss) per common unit (usd per unit) $ 0.51 $ (3.98)