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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 14, 2019
Nov. 15, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Partners Capital and Distribution [Line Items]          
Number of days after end of quarter within which distributions must be paid to unitholders     45 days    
Series B Preferred Units          
Partners Capital and Distribution [Line Items]          
Dividends paid (in dollars per unit)   $ 5.9549      
Cash Distribution | Series A Preferred Units          
Partners Capital and Distribution [Line Items]          
Preferred unit dividends     $ 112    
Cash Distribution | Series B Preferred Units          
Partners Capital and Distribution [Line Items]          
Preferred unit dividends     $ 49 $ 5  
Unit Distribution | Series A Preferred Units          
Partners Capital and Distribution [Line Items]          
Unit distributions (in units)     1,393,926 5,307,689 3,358,726
Partners’ Capital Excluding Noncontrolling Interests | Unit Distribution | Series A Preferred Units          
Partners Capital and Distribution [Line Items]          
Distributions paid to unitholders     $ 37 $ 139 $ 89
Other current liabilities | Series B Preferred Units          
Partners Capital and Distribution [Line Items]          
Dividends Payable     $ 6    
Other current liabilities | Subsequent Event | Cash Distribution | Series A Preferred Units          
Partners Capital and Distribution [Line Items]          
Preferred unit dividends $ 37