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Net Income/(Loss) Per Common Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Basic Net Income/(Loss) per Common Unit        
Net income/(loss) attributable to PAA $ 143 $ 449 $ (2,562) $ 1,865
Distributions to participating securities (1) (1) (1) (2)
Other 0 0 0 (4)
Net income/(loss) allocated to common unitholders 93 399 (2,712) 1,710
Diluted Net Income/(Loss) per Common Unit        
Net income/(loss) attributable to PAA 143 449 (2,562) 1,865
Distributions to participating securities (1) (1) (1) (2)
Net income/(loss) allocated to common unitholders $ 93 436 $ (2,712) 1,826
Equity-indexed Compensation Plan Award        
Effect of dilutive securities:        
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 earnings per unit (units)     400,000  
Series A Preferred Units        
Basic Net Income/(Loss) per Common Unit        
Distributions to preferred unitholders $ (37) (37) $ (112) (112)
Diluted Net Income/(Loss) per Common Unit        
Distributions to preferred unitholders $ (37) 0 $ (112) 0
Series A Preferred Units | Weighted average        
Net Income/(Loss) Per Common Unit        
Antidilutive securities excluded from computation of earnings per unit (units) 71,000,000   71,000,000  
Series B Preferred Units        
Basic Net Income/(Loss) per Common Unit        
Distributions to preferred unitholders $ (12) (12) $ (37) (37)
Diluted Net Income/(Loss) per Common Unit        
Distributions to preferred unitholders $ (12) $ (12) $ (37) $ (37)
Common Units        
Basic Net Income/(Loss) per Common Unit        
Basic weighted average common units outstanding (units) 728,000,000 728,000,000 728,000,000 727,000,000
Basic net income/(loss) per common unit (usd per unit) $ 0.13 $ 0.55 $ (3.72) $ 2.35
Diluted Net Income/(Loss) per Common Unit        
Basic weighted average common units outstanding (units) 728,000,000 728,000,000 728,000,000 727,000,000
Effect of dilutive securities:        
Series A preferred units (units) 0 71,000,000 0 71,000,000
Equity-indexed compensation plan awards (units) 0 1,000,000 0 2,000,000
Diluted weighted average common units outstanding (units) 728,000,000 800,000,000 728,000,000 800,000,000
Diluted net income/(loss) per common unit (usd per unit) $ 0.13 $ 0.55 $ (3.72) $ 2.28