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Partners' Capital and Distributions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended
Feb. 14, 2013
May 15, 2013
Subsequent Event
May 03, 2013
Subsequent Event
Incentive Distribution Made to Managing Member or General Partner      
Cash distributions paid to common unit holders $ 189 $ 195  
Cash distribution paid to General Partner - Incentive 81 86  
Cash distributions paid to General Partner - 2% 4 4  
Total distributions paid during the period $ 274 $ 285  
Cash distributions per limited partner unit (in dollars per unit) $ 0.5625 $ 0.5750  
Unitholders of record, date     May 03, 2013