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Net Income Per Limited Partner Unit (Details 2) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Diluted Net Income per Limited Partner Unit        
Net income attributable to Plains $ 378 $ 225 $ 609 $ 408
Less: General partner's incentive distribution (69) (52) (134) (103)
Less: General partner 2% ownership (6) (3) (10) (6)
Net income available to limited partners 303 170 465 299
Less: Undistributed earnings allocated and distributions to participating securities (1)   (2)  
Net income available to limited partners in accordance with application of the two-class method for MLPs $ 302 $ 170 $ 463 $ 299
Basic weighted average number of limited partner units outstanding (in units) 162 149 159 146
Effect of dilutive securities:        
Weighted average LTIP units (in units) 1 1 2 1
Diluted weighted average number of limited partner units outstanding (in units) 163 150 161 147
Diluted net income per limited partner unit (in dollars per unit) $ 1.85 $ 1.13 $ 2.88 $ 2.03
Impact to basic and diluted net income per limited partner unit (in dollars per unit) $ 0.38 $ 0.08 $ 0.37 $ 0.02