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Net Income Per Limited Partner Unit (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic and Diluted Net Income Per Limited Partner Unit                      
General partner ownership interest (as a percent)                 2.00%    
Numerator for Basic and Diluted Net Income per Limited Partner Unit:                      
Net income attributable to PAA $ 309 $ 231 $ 292 $ 528 $ 320 $ 165 $ 378 $ 230 $ 1,361 $ 1,094 $ 966
Net income available to limited partners                 967 789 730
Denominator for Basic and Diluted Net Income per Limited Partner Unit:                      
Basic weighted average number of limited partner units outstanding (in units)                 341 325 297
Effect of dilutive securities:                      
Weighted average LTIP units (in units)                 2 3 2
Diluted weighted average number of limited partner units outstanding (in units)                 343 328 299
Basic and Diluted Net Income per Limited Partner Unit                      
Basic net income per limited partner unit (in dollars per unit) $ 0.59 $ 0.38 $ 0.58 $ 1.28 $ 0.70 $ 0.27 $ 0.93 $ 0.52 $ 2.82 $ 2.41 $ 2.46
Diluted net income per limited partner unit (in dollars per unit) $ 0.58 $ 0.38 $ 0.57 $ 1.27 $ 0.69 $ 0.27 $ 0.93 $ 0.51 $ 2.80 $ 2.40 $ 2.44
Basic Net Income Per Limited Partner Unit
                      
Numerator for Basic and Diluted Net Income per Limited Partner Unit:                      
Net income attributable to PAA                 1,361 1,094 966
General partner's incentive distribution                 (375) (289) (221)
General partner 2% ownership                 (19) (16) (15)
Net income available to limited partners                 967 789 730
Undistributed earnings allocated and distributions to participating securities                 (7) (5)  
Net income available to limited partners in accordance with the application of the two-class method for MLPs                 960 784 730
Diluted Net Income Per Limited Partner Unit
                      
Numerator for Basic and Diluted Net Income per Limited Partner Unit:                      
Net income attributable to PAA                 1,361 1,094 966
General partner's incentive distribution                 (375) (289) (221)
General partner 2% ownership                 (19) (16) (15)
Net income available to limited partners                 967 789 730
Undistributed earnings allocated and distributions to participating securities                 (6) (4)  
Net income available to limited partners in accordance with the application of the two-class method for MLPs                 $ 961 $ 785 $ 730