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Partners' Capital and Distributions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended
May 15, 2013
Feb. 14, 2013
Aug. 14, 2013
Subsequent Event
Aug. 02, 2013
Subsequent Event
Incentive Distribution Made to Managing Member or General Partner        
Cash distributions paid to common unit holders $ 195 $ 189 $ 201  
Cash distribution paid to General Partner - Incentive 86 81 91  
Cash distributions paid to General Partner - 2% 4 4 4  
Total distributions paid during the period $ 285 $ 274 $ 296  
Cash distributions per limited partner unit (in dollars per unit) $ 0.5750 $ 0.5625 $ 0.5875  
Unitholders of record, date       Aug. 02, 2013