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Net Income Per Limited Partner Unit (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net Income Per Limited Partner Unit        
General partner ownership interest (as a percent)     2.00%  
Basic Net Income per Limited Partner Unit        
Net income attributable to PAA $ 323 $ 231 $ 994 $ 1,052
Less: General partner's incentive distribution (124) (95) (351) (272)
Less: General partner 2% ownership (4) (3) (13) (16)
Net income available to limited partners 195 133 630 764
Less: Undistributed earnings allocated and distributions to participating securities (1) (1) (5) (5)
Net income available to limited partners in accordance with application of the two-class method for MLPs 194 132 625 759
Basic weighted average limited partner units outstanding (in units) 370 343 365 340
Basic net income per limited partner unit (in dollars per unit) $ 0.52 $ 0.38 $ 1.71 $ 2.23
Diluted Net Income per Limited Partner Unit        
Net income attributable to PAA 323 231 994 1,052
Less: General partner's incentive distribution (124) (95) (351) (272)
Less: General partner 2% ownership (4) (3) (13) (16)
Net income available to limited partners 195 133 630 764
Less: Undistributed earnings allocated and distributions to participating securities (1) (1) (5) (4)
Net income available to limited partners in accordance with application of the two-class method for MLPs $ 194 $ 132 $ 625 $ 760
Basic weighted average limited partner units outstanding (in units) 370 343 365 340
Effect of dilutive securities:        
Weighted average LTIP units (in units) 1 2 2 2
Diluted weighted average limited partner units outstanding (in units) 371 345 367 342
Diluted net income per limited partner unit (in dollars per unit) $ 0.52 $ 0.38 $ 1.70 $ 2.22