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Partners' Capital and Distributions - Distributions Paid (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 12, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Partners Capital and Distributions        
Total distributions paid during the period   $ 1,674 $ 1,410 $ 1,209
Distributions per common unit (in dollars per unit)   $ 2.755 $ 2.550 $ 2.325
Subsequent Event | Fourth Quarter Distribution        
Partners Capital and Distributions        
Distribution declared, date Jan. 12, 2016      
Distribution per common unit declared (in dollars per unit) $ 0.70      
Distribution paid, date Feb. 12, 2016      
Unitholders of record, date Jan. 29, 2016      
Distribution percentage for general partner interest 2.00%      
Partners' Capital Excluding Noncontrolling Interests        
Partners Capital and Distributions        
Distributions paid to Common Unitholders   $ 1,081 $ 934 $ 791
Distributions paid to General Partner   590 473 369
Total distributions paid during the period   $ 1,671 $ 1,407 $ 1,160
Partners' Capital Excluding Noncontrolling Interests | Subsequent Event | Fourth Quarter Distribution        
Partners Capital and Distributions        
Distributions paid to Common Unitholders $ 278      
Distributions paid to General Partner 155      
Total distributions paid during the period $ 433