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Acquisitions and Divestitures (Narrative) (Details) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Nov. 13, 2020
Aug. 31, 2020
Jul. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale of property and equipment             $ 12,000,000 $ 54,000,000 $ 1,643,000,000
Gain on sale of assets, net             0 (2,000,000) 17,000,000
Impairments             2,830,000,000 16,000,000 171,000,000
Montage Resources Corporation                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Number of Southwestern Energy common stock for each share of Montage Resources Corporation common stock converted (in shares) 1.8656 1.8656              
Offering price (in dollars per share) $ 3.05 $ 2.50              
Percentage of voting interest 90.00%                
Proved property acquired $ 1,000,000,000.0                
Unproved property acquired 90,000,000                
Other property, plant and equipment $ 28,000,000                
Revenues associated with the operations acquired through the Merger         $ 63,000,000        
Net income attributable to common stockholders associated with the operations acquired through the Merger         $ 28,000,000        
Impairments             0    
Montage Resources Corporation | Public Stock Offering                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Underwritten public offering of common stock (in shares)   63,250,000              
Net proceeds from public offering   $ 152,000,000              
Montage Resources Corporation | Montage Resources Corporation                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Percentage of voting interest 10.00%                
Other non-core assets                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale of property and equipment               38,000,000  
Impairments           $ 1,000,000 $ 5,000,000 $ 16,000,000 11,000,000
Land                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale of property and equipment     $ 16,000,000            
Gain on sale of assets, net     $ 2,000,000            
Discontinued operations, held-for-sale                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairments           161,000,000     $ 160,000,000
Senior Notes | Eight Point Three Seven Five Percent Senior Notes Due September 2028                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Senior notes   350,000,000              
Stated interest rate         8.375%   8.375%    
Senior Notes | Montage Resources Corporation | Eight Point Eight Seven Five Percent Senior Notes Due 2023                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Senior notes   $ 510,000,000              
Stated interest rate   8.875%              
Senior Notes | Montage Resources Corporation | Eight Point Three Seven Five Percent Senior Notes Due September 2028                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Senior notes   $ 350,000,000              
Stated interest rate   8.375%              
Marketing | Discontinued operations, held-for-sale                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairments           145,000,000      
Exploration and Production | Discontinued operations, held-for-sale                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Impairments           $ 15,000,000      
Fayetteville Shale                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale of oil and gas property and equipment       $ 1,650,000,000          
Adjustment due to differences from economic effective date to close date       215,000,000          
Gain on the sale of non-full cost pool assets       17,000,000          
Reduction of full cost pool assets       $ 887,000,000