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Organization and Summary of Significant Accounting Policies (Narrative) (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Sep. 01, 2021
USD ($)
$ / shares
shares
Nov. 13, 2020
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Aug. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
segment
subsidiary
$ / shares
shares
Dec. 31, 2020
USD ($)
subsidiary
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Number of segments | segment           2        
Cash and cash equivalents $ 28,000,000         $ 28,000,000 $ 13,000,000      
Outstanding checks included in accounts payable 21,000,000         $ 21,000,000 16,000,000      
Natural gas, oil and NGL reserves discount           10.00%        
Net book value adjusted for market differentials             2,825,000,000      
Impairments           $ 6,000,000 2,830,000,000 $ 16,000,000    
Net unevaluated costs excluded from amortization, cumulative 2,231,000,000         2,231,000,000 1,472,000,000      
Other long-term assets $ 84,000,000         $ 84,000,000 $ 69,000,000      
Treasury stock acquired               $ 21,000,000 $ 180,000,000  
Treasury stock (in shares) | shares               5,260,687 39,061,268  
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares               $ 3.84 $ 4.63  
Shares held in trust (in shares) | shares 2,035         2,035 3,632      
Marketing-Related Intangible Assets                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Intangible assets, current $ 48,000,000         $ 48,000,000 $ 57,000,000      
Other long-term assets 43,000,000         43,000,000 48,000,000      
Amortization of intangible asset           8,000,000 9,000,000 $ 9,000,000    
Expected amortization in year one 5,000,000         5,000,000        
Expected amortization in year two 5,000,000         5,000,000        
Expected amortization in year three 5,000,000         5,000,000        
Expected amortization in year four 5,000,000         5,000,000        
Expected amortization in year five $ 5,000,000         5,000,000        
WPX Property Acquisition                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Percentage of interest acquired                   86.00%
GEPH Merger                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Shares of Southwestern common stock issued in respect of outstanding common stock and stock-based awards (in shares) | shares 99,337,748                  
Total consideration (fair value of Southwestern common shares issued) $ 463,000,000         $ 463,000,000        
Offering price (in dollars per share) | $ / shares $ 4.66         $ 4.66        
GEPH Merger | Common Stock                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Shares of Southwestern common stock issued in respect of outstanding common stock and stock-based awards (in shares) | shares           99,337,748        
Total consideration (fair value of Southwestern common shares issued) $ 463,000,000         $ 463,000,000        
Offering price (in dollars per share) | $ / shares $ 4.66         $ 4.66        
Indigo Natural Resources, LLC                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Shares of Southwestern common stock issued in respect of outstanding common stock and stock-based awards (in shares) | shares   337,827,171                
Total consideration (fair value of Southwestern common shares issued)   $ 1,588,000,000                
Offering price (in dollars per share) | $ / shares   $ 4.70                
Indigo Natural Resources, LLC | Common Stock                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Shares of Southwestern common stock issued in respect of outstanding common stock and stock-based awards (in shares) | shares       337,827,171            
Total consideration (fair value of Southwestern common shares issued)       $ 1,588,000,000            
Offering price (in dollars per share) | $ / shares   $ 4.70                
Montage Resources Corporation                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Impairments           $ 0 0      
Unamortized cost of properties acquired             1,087,000,000      
Net unevaluated costs excluded from amortization, cumulative $ 117,000,000         $ 117,000,000        
Shares of Southwestern common stock issued in respect of outstanding common stock and stock-based awards (in shares) | shares     69,740,848              
Total consideration (fair value of Southwestern common shares issued)     $ 213,000,000              
Offering price (in dollars per share) | $ / shares     $ 3.05   $ 2.50          
Number of Southwestern Energy common stock for each share of common stock converted (in shares) | shares     1.8656              
Montage Resources Corporation | Pro Forma                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Impairments             539,000,000      
Montage Resources Corporation | Common Stock                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Shares of Southwestern common stock issued in respect of outstanding common stock and stock-based awards (in shares) | shares     69,740,848              
Total consideration (fair value of Southwestern common shares issued)     $ 213,000,000              
Offering price (in dollars per share) | $ / shares     $ 3.05              
Number of Southwestern Energy common stock for each share of common stock converted (in shares) | shares     1.8656              
Montage Resources Corporation | Public Stock Offering                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Underwritten public offering of common stock (in shares) | shares         63,250,000          
Net proceeds from public offering         $ 152,000,000          
Non-full cost pool assets | Minimum                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Long lived assets, useful life           3 years        
Non-full cost pool assets | Maximum                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Long lived assets, useful life           30 years        
Other non-core assets                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Impairments           $ 6,000,000 $ 5,000,000      
Revenue Benchmark | Customer concentration risk | One Customer                    
Organization, Consolidation and Presentation of Financial Statements [Line Items]                    
Number of subsidiaries of major customer with which business is conducted | subsidiary           1 1      
Concentration percentage           12.00% 10.00%