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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Basic and Diluted Net Income per Common Unit        
Net income attributable to PAA $ 293 $ 203 $ 715 $ 390
Amounts allocated to participating securities (5) (1) (8) (1)
Other 1   2  
Net income allocated to common unitholders - Basic 227 153 588 290
Net income allocated to common unitholders - Diluted 227 153 588 290
Series A Preferred Units        
Basic and Diluted Net Income per Common Unit        
Distributions to preferred unitholders $ (44) $ (37) $ (85) $ (74)
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 71 71 71
Series B Preferred Units        
Basic and Diluted Net Income per Common Unit        
Distributions to preferred unitholders $ (18) $ (12) $ (36) $ (25)
Common Units        
Basic and Diluted Net Income per Common Unit        
Basic weighted average common units outstanding (units) 698 702 698 703
Diluted weighted average common units outstanding (units) 698 702 698 703
Basic net income per common unit (usd per unit) $ 0.32 $ 0.22 $ 0.84 $ 0.41
Diluted net income per common unit (usd per unit) $ 0.32 $ 0.22 $ 0.84 $ 0.41