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Partners' Capital and Distributions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended
May 31, 2012
Feb. 29, 2012
Mar. 31, 2012
Partners' Capital and Distributions      
Cash distributions paid to common unit holders $ 169 $ 159  
Cash distribution paid to General Partner - Incentive 65 63  
Reduction of Incentive Distribution 4    
Cash distributions paid to General Partner - 2% 3 3  
Total distributions paid during the period 237 225  
Cash distributions per limited partner unit (in dollars per unit) $ 1.0450 $ 1.0250  
General partner ownership interest (as a percent)     2.00%
Period for reduction of incentive (in years) 2 years    
Reduction in incentive distributions per year for the first two years (in dollars per year) 15    
Reduction in incentive distributions per year for the third year and thereafter (in dollars per year) $ 10