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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Basic and Diluted Net Income per Common Unit    
Net income attributable to PAA $ 266 $ 422
Amounts allocated to participating securities (1) (2)
Other 1 1
Net income allocated to common unitholders - Basic 203 361
Net income allocated to common unitholders - Diluted 203 361
Series A Preferred Units    
Basic and Diluted Net Income per Common Unit    
Distributions to preferred unitholders $ (44) $ (42)
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
Series B Preferred Units    
Basic and Diluted Net Income per Common Unit    
Distributions to preferred unitholders $ (19) $ (18)
Common Units    
Basic and Diluted Net Income per Common Unit    
Basic weighted average common units outstanding (units) 701 698
Diluted weighted average common units outstanding (units) 701 698
Basic net income per common unit (usd per unit) $ 0.29 $ 0.52
Diluted net income per common unit (usd per unit) $ 0.29 $ 0.52