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Partners' Capital and Distributions (Details 3) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Partners' Capital and Distributions              
Cash distributions paid to common unitholders $ 147 $ 145 $ 135        
Cash distribution paid to General Partner - Incentive 52 50 46 50 39 97 77
Cash distributions paid to General Partner - 2% 3 3 3        
Distributions paid to common unitholders and general partner 202 198 184     382 335
Cash distributions per limited partner unit (in dollars per unit) $ 0.9825 $ 0.9700 $ 0.9575        
Remaining reduction in incentive distributions in 2011           $ 1  
General partner ownership interest (as a percent)           2.00%