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Equity Method Investments - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jan. 01, 2019
Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]              
Income from equity method investments $ 109,000,000 $ 115,000,000 $ 330,000,000 $ 265,000,000      
Distribution from equity method investment 142,000,000 130,000,000 412,000,000 341,000,000      
Unamortized basis differences included in equity investments 86,000,000   86,000,000   $ 92,000,000    
Amortization expense (income) 2,000,000 2,000,000 6,000,000 4,000,000      
Equity method investments $ 1,045,000,000   $ 1,045,000,000   $ 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 $ 7,000,000 8,000,000 $ 25,000,000 25,000,000      
Mars              
Schedule of Equity Method Investments [Line Items]              
Ownership 71.50%   71.50%   71.50%    
Income from equity method investments $ 33,000,000 35,000,000 $ 92,000,000 93,000,000      
Equity method investments 156,000,000   156,000,000   $ 161,000,000    
Amberjack – Series A / Series B              
Schedule of Equity Method Investments [Line Items]              
Income from equity method investments 28,000,000 31,000,000 86,000,000 94,000,000      
Equity method investments $ 395,000,000   $ 395,000,000   $ 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 $ 88,000,000   $ 88,000,000   $ 91,000,000    
Capital contribution $ 0 3,000,000 $ 0 13,000,000      
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 $ 30,000,000 $ 0      
Equity method investments $ 166,000,000   $ 166,000,000   $ 0