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Partners' Capital and Distributions - Preferred Unit Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 14, 2020
Nov. 15, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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     $ 149 $ 112  
Cash Distribution | Series B Preferred Units          
Partners Capital and Distribution [Line Items]          
Preferred unit dividends     49 $ 49 $ 5
Unit Distribution | Series A Preferred Units          
Partners Capital and Distribution [Line Items]          
Unit distributions (in units)       1,393,926 5,307,689
Distributions paid to unitholders       $ 37 $ 139
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