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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic Net Income per Common Unit        
Net income attributable to PAA $ 101 $ 124 $ 302 $ 407
Distributions to Series A preferred units (33)   (55)  
Distributions to general partner (155) (152) (310) (300)
Distributions to participating securities (1) (1) (2) (3)
Undistributed loss allocated to general partner 7 6 12 9
Net income/(loss) allocated to common unitholders in accordance with application of the two-class method for MLPs (81) (23) (53) 113
Diluted Net Income per Common Unit        
Net income attributable to PAA 101 124 302 407
Distributions to Series A preferred units (33)   (55)  
Distributions to general partner (155) (152) (310) (300)
Distributions to participating securities (1) (1) (2) (3)
Undistributed loss allocated to general partner 7 6 12 9
Net income/(loss) allocated to common unitholders in accordance with application of the two-class method for MLPs $ (81) $ (23) $ (53) $ 113
Common Units        
Basic Net Income per Common Unit        
Basic weighted average common units outstanding 398 397 398 390
Basic net income/(loss) per common unit (in dollars per unit) $ (0.20) $ (0.06) $ (0.13) $ 0.29
Diluted Net Income per Common Unit        
Basic weighted average common units outstanding 398 397 398 390
Effect of dilutive securities: Weighted average LTIP units       3
Diluted weighted average common units outstanding 398 397 398 393
Diluted net income/(loss) per common unit (in dollars per unit) $ (0.20) $ (0.06) $ (0.13) $ 0.29