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Partners' Capital and Distributions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 6 Months Ended
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Jun. 30, 2012
Partners' Capital and Distributions        
Cash distributions paid to common unit holders $ 174 $ 169 $ 159  
Cash distribution paid to General Partner - Incentive 69 65 63  
Reduction of Incentive Distribution       3.75
Cash distributions paid to General Partner - 2% 4 3 3  
Total distributions paid during the period 247 237 225  
Cash distributions per limited partner unit (in dollars per unit) $ 1.0650 $ 1.0450 $ 1.0250  
Unitholders of record, date Aug. 03, 2012      
Reduction in incentive distributions per quarter through February 2014 (in dollars per quarter)       3.75
Reduction in incentive distributions per quarter after February 2014 (in dollars per quarter)       $ 2.5