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Net Income Per Limited Partner Unit (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 9 Months Ended
Oct. 02, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net Income Per Limited Partner Unit          
Unit split conversion ratio 2        
General partner ownership interest (as a percent)       2.00%  
Numerator for Basic and Diluted Net Income per Limited Partner Unit (prior period adjusted for stock split):          
Net income attributable to Plains   $ 165 $ 281 $ 774 $ 688
Less: General partner's incentive distribution   (74) (55) (208) (158)
Less: General partner 2% ownership   (2) (5) (12) (10)
Net income available to limited partners   89 221 554 520
Less: Undistributed earnings allocated and distributions to participating securities   (1)   (3)  
Net income available to limited partners in accordance with the application of the two-class method for MLPs   $ 88 $ 221 $ 551 $ 520
Denominator for Basic and Diluted Net Income per Limited Partner Unit (prior period adjusted for stock split):          
Basic weighted average number of limited partner units outstanding (in units)   329 299 322 294
Effect of dilutive securities (prior period adjusted for stock split):          
Weighted average LTIP units (in units)   2 1 3 2
Diluted weighted average number of limited partner units outstanding (in units)   331 300 325 296
Basic net income per limited partner unit (in dollars per unit)   $ 0.27 $ 0.74 $ 1.71 $ 1.77
Diluted net income per limited partner unit (in dollars per unit)   $ 0.27 $ 0.74 $ 1.70 $ 1.76