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Partners' Capital and Distributions (Details 2) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 9 Months Ended
Oct. 02, 2012
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Sep. 30, 2012
Partners' Capital and Distributions            
Cash distributions paid to common unit holders   $ 181 $ 174 $ 169 $ 159  
Cash distribution paid to General Partner - Incentive   74 69 65 63  
Cash distributions paid to General Partner - 2%   4 4 3 3  
Total distributions paid during the period   259 247 237 225  
Cash distributions per limited partner unit (in dollars per unit)   $ 0.5425 $ 0.5325 $ 0.5225 $ 0.5125  
Unitholders of record, date   Nov. 02, 2012        
Unit split conversion ratio 2          
Reduction of Incentive Distribution           7.5
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