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Partners' Capital and Distributions - Distributions Paid (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 14, 2017
Jan. 09, 2017
Nov. 14, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Partners Capital and Distributions            
Percentage of available cash distributed       100.00%    
Number of days after end of quarter within which distributions must be paid to unitholders       45 days    
Total distributions paid during the period       $ 1,631 $ 1,674 $ 1,410
Distributions per common unit (in dollars per unit)       $ 2.65 $ 2.76 $ 2.55
Reduction in incentive distributions       $ 18 $ 22 $ 23
Cash distributions paid       1,062 1,081 934
Subsequent Event | Fourth quarter distribution            
Partners Capital and Distributions            
Distribution declared, date   Jan. 09, 2017        
Distribution per common unit declared (in dollars per unit)   $ 0.55        
Cash distributions paid $ 371          
Distribution paid, date Feb. 14, 2017          
Unitholders of record, date Jan. 31, 2017          
Partners' Capital Excluding Noncontrolling Interests            
Partners Capital and Distributions            
Total distributions paid during the period       1,627 1,671 1,407
General Partner Distribution - Level One            
Partners Capital and Distributions            
Percent of distribution amount to the general partner before incentive distributions     2.00%      
General Partner Distribution - Level Two            
Partners Capital and Distributions            
Quarterly incentive distribution threshold amount (in dollars per unit)     $ 0.2250      
Percent of distribution amount to the general partner above threshold     15.00%      
General Partner Distribution - Level Three            
Partners Capital and Distributions            
Quarterly incentive distribution threshold amount (in dollars per unit)     $ 0.2475      
Percent of distribution amount to the general partner above threshold     25.00%      
General Partner Distribution - Level Four            
Partners Capital and Distributions            
Quarterly incentive distribution threshold amount (in dollars per unit)     $ 0.3375      
Percent of distribution amount to the general partner above threshold     50.00%      
Unit Distribution | Series A Preferred Units            
Partners Capital and Distributions            
Distributions paid to Common Unitholders       $ 89    
Unit distributions paid (in units)       3,358,726    
Unit Distribution | Series A Preferred Units | Subsequent Event            
Partners Capital and Distributions            
Distributions paid to Common Unitholders $ 34          
Unit distributions paid (in units) 1,287,773          
Cash Distribution            
Partners Capital and Distributions            
Distributions paid to General Partner       $ 565 590 473
Total distributions paid during the period       1,627 1,671 1,407
Cash Distribution | Common Units            
Partners Capital and Distributions            
Distributions paid to Common Unitholders       $ 1,062 $ 1,081 $ 934