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Investments - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
JWH Midstream LLC (JWH)        
Schedule of Equity Method Investments [Line Items]        
Business acquisition, percent acquired 50.00% 50.00%    
Equity method investments     $ 17  
Payments to terminate involvement in partnership $ 7      
Impairment expense   $ 24    
FTS International, Inc.        
Schedule of Equity Method Investments [Line Items]        
Investment, ownership percentage 20.00% 20.00%   29.00%
Investment, realized gain (loss)   $ 61    
Number of shares sold (in shares)   4.3    
Proceeds from sale of equity method investments   $ 74    
Shares held (in shares) 22.0 22.0    
Book value $ 65 $ 65    
FTS International, Inc. | IPO        
Schedule of Equity Method Investments [Line Items]        
Investment, ownership percentage 24.00% 24.00%    
Investment, realized gain (loss)   $ 78