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Acquisition (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Sep. 01, 2021
Nov. 13, 2020
Sep. 30, 2021
Aug. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 02, 2021
Dec. 31, 2020
Business Acquisition [Line Items]                
Cash consideration         $ 373 $ 0    
Long-term debt     $ 4,237   4,237      
Obligation under transportation agreements     9,797   9,797      
Indigo Agreement                
Business Acquisition [Line Items]                
Obligation under transportation agreements     34   34      
Liability for the estimated future payments     17   17      
Purchase or volume commitments with gathering fresh water and sand                
Business Acquisition [Line Items]                
Obligation under transportation agreements     $ 81   $ 81      
Minimum                
Business Acquisition [Line Items]                
Contractual commitments payments, term (in years)         2 years      
Maximum                
Business Acquisition [Line Items]                
Contractual commitments payments, term (in years)         7 years      
Indigo Natural Resources, LLC                
Business Acquisition [Line Items]                
Cash consideration $ 373              
Shares of Southwestern common stock issued 337,827,171   337,827,171          
Value of Southwestern's stock issued as consideration $ 1,588              
NYSE closing price per share of Southwestern common shares (in dollars per share) $ 4.70              
Senior unsecured notes $ 726              
Revolving credit facility $ 95              
Percentage of voting interest 67.00%              
Evaluated oil and gas properties $ 2,724              
Unevaluated oil and gas properties 676              
Other property, plant and equipment $ 4              
Operating revenues acquired through the merger     $ 132          
Operating income acquired through the merger     $ 75          
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]                
Shares of Southwestern common stock issued   69,740,848            
Value of Southwestern's stock issued as consideration   $ 213            
NYSE closing price per share of Southwestern common shares (in dollars per share)   $ 3.05            
Senior unsecured notes   $ 522            
Revolving credit facility   $ 200            
Percentage of voting interest   90.00%            
Evaluated oil and gas properties   $ 1,012            
Unevaluated oil and gas properties   90            
Other property, plant and equipment   $ 28            
Operating revenues acquired through the merger         $ 414      
Operating income acquired through the merger         $ 219      
Number of Southwestern Energy common stock for each share of Montage Resources Corporation common stock converted (in shares)   1.8656            
Montage Resources Corporation | Public Stock Offering                
Business Acquisition [Line Items]                
NYSE closing price per share of Southwestern common shares (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 | 5.375% Senior Notes due February 2029                
Business Acquisition [Line Items]                
Stated interest rate 5.375%   5.375%   5.375%   5.375%  
Long-term debt $ 700           $ 700  
Senior Notes | 8.375% Senior Notes due September 2028                
Business Acquisition [Line Items]                
Stated interest rate     8.375% 8.375% 8.375%     8.375%
Senior notes       $ 350        
Senior Notes | Montage Resources Corporation | 8.375% Senior Notes due September 2028                
Business Acquisition [Line Items]                
Senior notes       $ 510        
Senior Notes | Montage Resources Corporation | 8.875% Senior Notes due September 2023                
Business Acquisition [Line Items]                
Stated interest rate       8.875%        
Senior notes       $ 510        
Senior Notes | Indigo Natural Resources, LLC | 5.375% Senior Notes due February 2029                
Business Acquisition [Line Items]                
Senior note assumed in merger agreement $ 700   $ 700   $ 700      
Stated interest rate 5.375%   5.375%   5.375%      
Senior Notes | Montage Resources Corporation | 8.375% Senior Notes due September 2028                
Business Acquisition [Line Items]                
Stated interest rate       8.375%        
Senior notes       $ 350