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ACQUISITION (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 28, 2021
Nov. 13, 2020
Aug. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 01, 2021
Dec. 31, 2020
Business Acquisition [Line Items]                    
Transaction related expenses       $ 3 $ 0   $ 4 $ 0    
Indigo Natural Resources, LLC                    
Business Acquisition [Line Items]                    
Value of Southwestern's stock issued as consideration $ 1,600                  
Transaction related expenses       2     2      
Percentage of voting interest                 67.00%  
Indigo Natural Resources, LLC | Forecast                    
Business Acquisition [Line Items]                    
Cash consideration           $ 400        
Number of shares of Southwestern common stock issued during Merger           339,270,568        
Indigo Natural Resources, LLC | Indigo Natural Resources, LLC                    
Business Acquisition [Line Items]                    
Percentage of voting interest                 33.00%  
Montage Resources Corporation                    
Business Acquisition [Line Items]                    
Number of shares of Southwestern common stock issued during Merger   69,740,848                
Value of Southwestern's stock issued as consideration   $ 213                
Number of Southwestern Energy common stock for each share of Montage Resources Corporation common stock converted (in shares)   1.8656                
Offering price (in dollars per share)   $ 3.05                
Percentage of voting interest   90.00%                
Revenues associated with the operations acquired through the Merger             250      
Net income attributable to common stockholders associated with the operations acquired through the Merger             121      
Employee severance and related costs       $ 1     $ 2      
Montage Resources Corporation | Public Stock Offering                    
Business Acquisition [Line Items]                    
Offering price (in dollars per share)     $ 2.50              
Underwritten public offering of common stock (in shares)     63,250,000              
Net proceeds from public offering     $ 152              
Montage Resources Corporation | Montage Resources Corporation                    
Business Acquisition [Line Items]                    
Percentage of voting interest   10.00%                
Senior Notes | 8.375% Senior Notes due September 2028                    
Business Acquisition [Line Items]                    
Senior notes     $ 350              
Stated interest rate     8.375% 8.375%     8.375%     8.375%
Senior Notes | Montage Resources Corporation | Eight Point Eight Seven Five Percent Senior Notes Due 2023                    
Business Acquisition [Line Items]                    
Senior notes     $ 510              
Stated interest rate     8.875%              
Senior Notes | Indigo Natural Resources, LLC | 5.375% Senior Notes due 2029 | Forecast                    
Business Acquisition [Line Items]                    
Stated interest rate           5.375%        
Senior note assumed in merger agreement           $ 700        
Senior Notes | Montage Resources Corporation | 8.375% Senior Notes due September 2028                    
Business Acquisition [Line Items]                    
Senior notes     $ 350              
Stated interest rate     8.375%