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Organization and Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
segment
Jun. 30, 2011
Organization and Basis of Presentation        
Operating segments number     3  
Partner Income Allocation        
General partner ownership interest (as a percent)     2.00%  
Net Income Attributable to Plains $ 378 $ 225 $ 609 $ 408
Limited Partner
        
Partner Income Allocation        
Limited partner ownership interest (as a percent)     98.00%  
Net Income Attributable to Plains   170   299
General Partner
        
Partner Income Allocation        
General partner ownership interest (as a percent)     2.00%  
Net Income Attributable to Plains   55   109
Total Net Income Attributable to Plains
        
Partner Income Allocation        
Net Income Attributable to Plains   225   408
Amounts Previously Reported | Limited Partner
        
Partner Income Allocation        
Net Income Attributable to Plains   171   305
Amounts Previously Reported | General Partner
        
Partner Income Allocation        
Net Income Attributable to Plains   $ 54   $ 103