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Net Income Per Common Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic Net Income per Common Unit                      
Net income attributable to PAA $ 247 $ 249 $ 124 $ 283 $ 389 $ 323 $ 287 $ 384 $ 903 $ 1,384 $ 1,361
Less: Distributions to general partner                 (608) (502) (392)
Less: Distributions to participating securities                 (6) (6) (5)
Less: Undistributed (earnings)/loss allocated to general partner and participating securities                 16 2 (4)
Net income attributable to common unitholders in accordance with application of the two-class method for MLPs                 $ 305 $ 878 $ 960
Basic weighted average common units outstanding (in units)                 394 367 341
Basic net income/(loss) per common unit (in dollars per unit) $ 0.24 $ 0.25 $ (0.06) $ 0.36 $ 0.67 $ 0.52 $ 0.45 $ 0.74 $ 0.78 $ 2.39 $ 2.82
Diluted Net Income per Common Unit                      
Net income attributable to PAA $ 247 $ 249 $ 124 $ 283 $ 389 $ 323 $ 287 $ 384 $ 903 $ 1,384 $ 1,361
Less: Distributions to general partner                 (608) (502) (392)
Less: Distributions to participating securities                 (6) (6) (5)
Less: Undistributed (earnings)/loss allocated to general partner and participating securities                 16 2 (3)
Net income attributable to common unitholders in accordance with application of the two-class method for MLPs                 $ 305 $ 878 $ 961
Basic weighted average common units outstanding (in units)                 394 367 341
Effect of dilutive securities: Weighted average LTIP units                 2 2 2
Diluted weighted average common units outstanding                 396 369 343
Diluted net income/(loss) per common unit (in dollars per unit) $ 0.24 $ 0.24 $ (0.06) $ 0.35 $ 0.67 $ 0.52 $ 0.45 $ 0.73 $ 0.77 $ 2.38 $ 2.80