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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Basic and Diluted Net Income per Common Unit    
Net income attributable to PAA $ 422 $ 187
Amounts allocated to participating securities (2) (1)
Other 1  
Net income allocated to common unitholders - Basic 361 137
Net income allocated to common unitholders - Diluted $ 361 $ 137
Equity-indexed Compensation Plan Award | Weighted average    
Net Income/(Loss) Per Common Unit    
Dilutive equity-indexed compensation plan awards (units) 4.9 0.7
Series A Preferred Units    
Basic and Diluted Net Income per Common Unit    
Distributions to preferred unitholders $ (42) $ (37)
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
Series B Preferred Units    
Basic and Diluted Net Income per Common Unit    
Distributions to preferred unitholders $ (18) $ (12)
Common Units    
Basic and Diluted Net Income per Common Unit    
Basic weighted average common units outstanding (units) 698.0 705.0
Diluted weighted average common units outstanding (units) 698.0 705.0
Basic net income per common unit (usd per unit) $ 0.52 $ 0.19
Diluted net income per common unit (usd per unit) $ 0.52 $ 0.19