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Partners' Capital and Distributions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Feb. 14, 2014
Mar. 31, 2014
May 15, 2014
Subsequent Event
First Quarter Distribution
Mar. 31, 2014
Subsequent Event
First Quarter Distribution
Incentive Distribution Made to Managing Member or General Partner        
Distributions paid to common unit holders $ 221   $ 229  
Distributions paid to General Partner - Incentive 102   110  
Distributions paid to General Partner - 2% 5   5  
Total distributions paid during the period $ 328   $ 344  
Cash distributions per limited partner unit (in dollars per unit) $ 0.6150   $ 0.6300  
Unitholders of record, date       May 02, 2014
Distribution declared, date   Jan. 09, 2014   Apr. 07, 2014