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Net Income/(Loss) Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic and Diluted Net Income/(Loss) per Common Unit        
Net income/(loss) attributable to PAA $ (220) $ 142 $ 202 $ (2,705)
Distributions to participating securities 0 (1) 0 (1)
Net income/(loss) allocated to common unitholders - Diluted (269) 92 103 (2,805)
Net income/(loss) allocated to common unitholders - Basic $ (269) $ 92 $ 103 $ (2,805)
Weighted average        
Net Income/(Loss) Per Common Unit        
Dilutive LTIP awards (units)   0.1 0.4  
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) 0.7     0.5
Series A Preferred Units        
Basic and Diluted Net Income/(Loss) per Common Unit        
Distributions to preferred unitholders $ (37) $ (37) $ (74) $ (74)
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) 71.0 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) $ (25) $ (25)
Common Units        
Basic and Diluted Net Income/(Loss) per Common Unit        
Basic weighted average common units outstanding (units) 720.0 728.0 721.0 728.0
Diluted weighted average common units outstanding (units) 720.0 728.0 721.0 728.0
Basic net income/(loss) per common unit (usd per unit) $ (0.37) $ 0.13 $ 0.14 $ (3.85)
Diluted net income/(loss) per common unit (usd per unit) $ (0.37) $ 0.13 $ 0.14 $ (3.85)