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Acquisition (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 12, 2020
Aug. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]            
Transaction related expneses     $ 3 $ 0 $ 3 $ 0
8.375% Senior Notes due September 2028 (3) | Senior Notes            
Business Acquisition [Line Items]            
Senior notes   $ 350        
Stated interest rate     8.375%   8.375%  
Proceeds from issuance of long-term debt   $ 345        
Montage Resources Corporation | Eight Point Eight Seven Five Percent Senior Notes Due 2023 | Senior Notes            
Business Acquisition [Line Items]            
Senior notes     $ 510   $ 510  
Stated interest rate     8.875%   8.875%  
Montage Resources Corporation            
Business Acquisition [Line Items]            
Number of Southwestern Energy common stock for each share of Montage Resources Corporation common stock converted (in shares) 1.8656          
Percentage of voting interest     90.00%   90.00%  
Offering price (in dollars per share)   $ 2.50        
Transaction related expneses     $ 3   $ 3  
Montage Resources Corporation | Public Stock Offering            
Business Acquisition [Line Items]            
Underwritten public offering of common stock (in shares)   63,250,000        
Net proceeds from public offering   $ 152        
Montage Resources Corporation | 8.375% Senior Notes due September 2028 (3) | Senior Notes            
Business Acquisition [Line Items]            
Senior notes   $ 350        
Stated interest rate   8.375%        
Proceeds from issuance of long-term debt   $ 345        
Montage Resources Corporation | Montage Resources Corporation            
Business Acquisition [Line Items]            
Percentage of voting interest     10.00%   10.00%