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Investments - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Feb. 01, 2019
Schedule of Equity Method Investments [Line Items]          
Proceeds from sales of investments $ 0 $ 74 $ 0    
Share price (in usd per share)         $ 568
JWH midstream LLC (JWH)          
Schedule of Equity Method Investments [Line Items]          
Business acquisition, percent acquired 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% 29.00%    
Investment, realized gain (loss)   $ 61      
Number of shares sold (in shares)   4.3      
Proceeds from sales of investments   $ 74      
Shares owned (in shares)   22.0      
Equity securities, cost $ 65        
Share price (in usd per share) $ 1.04        
Impairments of investments $ 43        
FTS international, inc. | IPO          
Schedule of Equity Method Investments [Line Items]          
Investment, ownership percentage   24.00%      
Investment, realized gain (loss)   $ 78