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Partners' Capital and Distributions - Noncontrolling Interest in Subsidiaries (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Noncontrolling Interest [Line Items]        
Distributions paid $ 179 $ 184 $ 365 $ 496
Noncontrolling Interests        
Noncontrolling Interest [Line Items]        
Distributions paid   $ 4 6 $ 4
Red River LLC | Noncontrolling Interests        
Noncontrolling Interest [Line Items]        
Distributions paid     $ 6