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Equity Method Investments - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jan. 01, 2019
Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]              
Income from equity method investments $ 109,000,000 $ 80,000,000 $ 221,000,000 $ 150,000,000      
Unamortized basis differences included in equity investments 88,000,000   88,000,000   $ 92,000,000    
Amortization expense (income) 2,000,000 1,000,000 4,000,000 2,000,000      
Equity method investments $ 1,069,000,000   $ 1,069,000,000   $ 926,000,000    
Poseidon              
Schedule of Equity Method Investments [Line Items]              
Ownership 36.00%   36.00%   36.00%    
Equity method investments $ 0   $ 0   $ 0   $ 0
Investment, excess distribution $ 9,000,000 9,000,000 $ 18,000,000 17,000,000      
Mars              
Schedule of Equity Method Investments [Line Items]              
Ownership 71.50%   71.50%   71.50%    
Income from equity method investments $ 28,000,000 29,000,000 $ 59,000,000 58,000,000      
Equity method investments 153,000,000   153,000,000   $ 161,000,000    
Amberjack – Series A / Series B              
Schedule of Equity Method Investments [Line Items]              
Income from equity method investments 29,000,000 31,000,000 58,000,000 63,000,000      
Equity method investments $ 414,000,000   $ 414,000,000   $ 426,000,000    
Amberjack – Series A / Series B | Accounting Standards Update 2014-09 | Cumulative Effect, Period of Adoption, Adjustment              
Schedule of Equity Method Investments [Line Items]              
Decrease in retained earnings           $ 9,000,000  
Crestwood Permian Basin LLC (“Permian Basin”)              
Schedule of Equity Method Investments [Line Items]              
Ownership 50.00%   50.00%   50.00%    
Equity method investments $ 89,000,000   $ 89,000,000   $ 91,000,000    
Capital contribution $ 0 5,000,000 $ 0 10,000,000      
Mattox Pipeline Company LLC ("Mattox")              
Schedule of Equity Method Investments [Line Items]              
Ownership 79.00%   79.00%        
Mattox              
Schedule of Equity Method Investments [Line Items]              
Ownership 79.00%   79.00%   0.00%    
Income from equity method investments $ 15,000,000 $ 0 $ 15,000,000 $ 0      
Distribution from equity method investment 18,000,000            
Equity method investments $ 171,000,000   $ 171,000,000   $ 0