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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic Net Income per Common Unit        
Net income attributable to PAA $ 297 $ 249 $ 599 $ 657
Distributions to Series A preferred units (33)   (88)  
Distributions to general partner (102) (154) (412) (454)
Distributions to participating securities (1) (1) (3) (4)
Undistributed loss allocated to general partner 1 4 14 12
Net income allocated to common unitholders in accordance with application of the two-class method for MLPs 162 98 110 211
Diluted Net Income per Common Unit        
Net income attributable to PAA 297 249 599 657
Distributions to Series A preferred units (33)   (88)  
Distributions to general partner (102) (154) (412) (454)
Distributions to participating securities (1) (1) (3) (4)
Undistributed loss allocated to general partner 1 4 14 12
Net income allocated to common unitholders in accordance with application of the two-class method for MLPs $ 162 $ 98 $ 110 $ 211
Common Units        
Basic Net Income per Common Unit        
Basic weighted average common units outstanding (units) 401 398 399 393
Basic net income per common unit (usd per unit) $ 0.40 $ 0.25 $ 0.27 $ 0.54
Diluted Net Income per Common Unit        
Basic weighted average common units outstanding (units) 401 398 399 393
Effect of dilutive securities: Weighted average LTIP units (units) 1 1 1 2
Diluted weighted average common units outstanding (units) 402 399 400 395
Diluted net income per common unit (usd per unit) $ 0.40 $ 0.24 $ 0.27 $ 0.53