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Partners' Capital and Distributions - Noncontrolling Interest in Subsidiaries (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Noncontrolling Interest [Line Items]    
Distributions to noncontrolling interests $ 185 $ 311
Noncontrolling Interests    
Noncontrolling Interest [Line Items]    
Distributions to noncontrolling interests 6  
Red River LLC | Noncontrolling Interests    
Noncontrolling Interest [Line Items]    
Distributions to noncontrolling interests $ 6