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Debt (Senior Notes - Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2020
Jan. 31, 2015
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Apr. 07, 2020
Dec. 31, 2019
Jul. 31, 2018
Jul. 31, 2016
Debt Instrument [Line Items]                    
Gain on extinguishment of debt     $ 0 $ 7 $ 35 $ 7        
Senior Notes                    
Debt Instrument [Line Items]                    
Gain on extinguishment of debt         35          
Senior Notes | LIBOR                    
Debt Instrument [Line Items]                    
Incremental increase in basis points resulting from downgrades   0.25%                
Incremental decrease in basis points resulting from upgrades   0.25%                
4.95% Senior Notes due January 2025 | Senior Notes                    
Debt Instrument [Line Items]                    
Senior notes   $ 1,000                
Stated interest rate   4.95%         6.45% 4.95% 6.20%  
Stated interest rate cap                   6.95%
Repurchased amount     $ 36   $ 36          
4.10% Senior Notes due March 2022 | Senior Notes                    
Debt Instrument [Line Items]                    
Stated interest rate     4.10%   4.10%     4.10%    
Repurchased amount     $ 6   $ 6          
7.50% Senior Notes Due April 2026 | Senior Notes                    
Debt Instrument [Line Items]                    
Stated interest rate     7.50%   7.50%          
Repurchased amount     $ 21   $ 21          
7.75% Senior Notes due October 2027 | Senior Notes                    
Debt Instrument [Line Items]                    
Stated interest rate     7.75%   7.75%          
Repurchased amount     $ 44   $ 44          
4.50% Senior Notes due January 2020 | Senior Notes                    
Debt Instrument [Line Items]                    
Repurchased amount     $ 72   $ 72          
8.375% Senior Notes due September 2028 (3) | Senior Notes                    
Debt Instrument [Line Items]                    
Senior notes $ 350                  
Stated interest rate     8.375%   8.375%          
Proceeds from issuance of long-term debt $ 345                  
Percentage price of face value of the notes sold to the public 100.00%                  
Eight Point Eight Seven Five Percent Senior Notes Due 2023 | Senior Notes | Montage Resources Corporation                    
Debt Instrument [Line Items]                    
Senior notes     $ 510   $ 510          
Stated interest rate     8.875%   8.875%