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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic Net Income per Common Unit    
Net income attributable to PAA $ 202 $ 283
Less: Distributions to Series A Preferred Units (23)  
Less: Distributions to general partner (155) (148)
Less: Distributions to participating securities (1) (2)
Less: Undistributed loss allocated to general partner 5 3
Net income attributable to common unitholders in accordance with application of the two-class method for MLPs 28 136
Diluted Net Income per Common Unit    
Net income attributable to PAA 202 283
Less: Distributions to Series A Preferred Units (23)  
Less: Distributions to general partner (155) (148)
Less: Distributions to participating securities (1) (2)
Less: Undistributed loss allocated to general partner 5 3
Net income attributable to common unitholders in accordance with application of the two-class method for MLPs $ 28 $ 136
Common Units    
Basic Net Income per Common Unit    
Basic weighted average common units outstanding (in units) 398 383
Basic net income per common unit (in dollars per unit) $ 0.07 $ 0.36
Diluted Net Income per Common Unit    
Basic weighted average common units outstanding (in units) 398 383
Effect of dilutive securities: Weighted average LTIP units 1 2
Diluted weighted average common units outstanding 399 385
Diluted net income per common unit (in dollars per unit) $ 0.07 $ 0.35