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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Basic and Diluted Net Income per Common Unit      
Net income attributable to PAA $ 1,230 $ 1,037 $ 593
Amounts allocated to participating securities (10) (5) (2)
Other 5    
Net income allocated to common unitholders — Basic 976 831 393
Net income allocated to common unitholders — Diluted 976 831 393
Series A Preferred Units      
Basic and Diluted Net Income per Common Unit      
Distributions to preferred unitholders $ (173) $ (149) $ (149)
Series A Preferred Units | Weighted Average      
Net Income Per Common Unit      
Antidilutive securities excluded from computation of net income per common unit (in units) 71 71 71
Series B Preferred Units      
Basic and Diluted Net Income per Common Unit      
Distributions to preferred unitholders $ (76) $ (52) $ (49)
Common Units      
Basic and Diluted Net Income per Common Unit      
Basic weighted average common units outstanding (in units) 699 701 716
Diluted weighted average common units outstanding (in units) 699 701 716
Basic net income per common unit (in dollars per unit) $ 1.40 $ 1.19 $ 0.55
Diluted net income per common unit (in dollars per unit) $ 1.40 $ 1.19 $ 0.55