Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Narrative) (Details)

v3.20.2
Borrowings (Narrative) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2020
May 07, 2020
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2019
Oct. 03, 2016
Line of Credit Facility [Line Items]            
Total principal outstanding $ 3,225,000,000   $ 3,225,000,000   $ 3,185,000,000  
Period prior to maturity     182 days      
Minimum            
Line of Credit Facility [Line Items]            
Outstanding principal amount of issuance 100,000,000.0   $ 100,000,000.0      
New Credit Facility            
Line of Credit Facility [Line Items]            
Credit facility borrowing base 1,600,000,000 $ 1,700,000,000 1,600,000,000      
Increase limit   $ 1,600,000,000        
Total principal outstanding $ 1,030,000,000.00   $ 1,030,000,000.00      
Interest rate at period end (as a percent) 2.93%   2.93%      
Letters of credit outstanding $ 24,200,000   $ 24,200,000      
Extinguishment of debt 288,600,000          
Reduction in commitments due to issuance of notes 1,600,000,000   1,600,000,000      
New Credit Facility | LIBOR            
Line of Credit Facility [Line Items]            
Debt instrument interest rate (as a percent)   1.00%        
New Credit Facility | Federal Funds Rate            
Line of Credit Facility [Line Items]            
Debt instrument interest rate (as a percent)   0.50%        
New Credit Facility | Maximum            
Line of Credit Facility [Line Items]            
Leverage ratio   300.00%        
Unused capacity, commitment fee (as a percent)   0.50%        
New Credit Facility | Maximum | Base Rate            
Line of Credit Facility [Line Items]            
Debt instrument interest rate (as a percent)   2.00%        
New Credit Facility | Maximum | Eurodollar            
Line of Credit Facility [Line Items]            
Debt instrument interest rate (as a percent)   3.00%        
New Credit Facility | Minimum            
Line of Credit Facility [Line Items]            
Leverage ratio   100.00%        
Unused capacity, commitment fee (as a percent)   0.375%        
New Credit Facility | Minimum | Base Rate            
Line of Credit Facility [Line Items]            
Debt instrument interest rate (as a percent)   1.00%        
New Credit Facility | Minimum | Eurodollar            
Line of Credit Facility [Line Items]            
Debt instrument interest rate (as a percent)   2.00%        
6.25% Senior Notes due 2023            
Line of Credit Facility [Line Items]            
Total principal outstanding $ 650,000,000   $ 650,000,000   650,000,000  
Debt instrument, interest rate, stated (as a percent)           6.25%
6.25% Senior Notes due 2023 | Unsecured debt            
Line of Credit Facility [Line Items]            
Debt instrument, interest rate, stated (as a percent) 6.25%   6.25%     6.25%
6.125% Senior Notes due 2024            
Line of Credit Facility [Line Items]            
Total principal outstanding $ 600,000,000   $ 600,000,000   600,000,000  
Debt instrument, interest rate, stated (as a percent)           6.125%
6.125% Senior Notes due 2024 | Unsecured debt            
Line of Credit Facility [Line Items]            
Debt instrument, interest rate, stated (as a percent) 6.125%   6.125%      
9.00% Second Lien Senior Secured Notes due 2025            
Line of Credit Facility [Line Items]            
Total principal outstanding $ 300,000,000   $ 300,000,000   $ 0  
Debt instrument, interest rate, stated (as a percent) 9.00%   9.00%      
Debt instrument aggregate principal amount $ 300,000,000.0 $ 400,000,000.0 $ 300,000,000.0      
First Amendment to the Credit Agreement            
Line of Credit Facility [Line Items]            
Amount of cash held to lesser   $ 125,000,000.0        
Percent of borrowing base   7.50%        
Period required for entering into and maintain minimum hedges   12 months        
First Amendment to the Credit Agreement | LIBOR            
Line of Credit Facility [Line Items]            
Increase in applicable margins   0.75%        
First Amendment to the Credit Agreement | Base Rate            
Line of Credit Facility [Line Items]            
Increase in applicable margins   0.75%        
First Amendment to the Credit Agreement | Maximum            
Line of Credit Facility [Line Items]            
Total funded debt to EBITDAX ratio   400.00%        
Leverage ratio   100.00%        
Leverage ratio for certain investments and cash distributions   250.00%        
First Amendment to the Credit Agreement | Maximum | Forecast            
Line of Credit Facility [Line Items]            
Total funded debt to EBITDAX ratio       300.00%    
First Amendment to the Credit Agreement | Minimum            
Line of Credit Facility [Line Items]            
Net notional volumes, percent of reasonably anticipated production   40.00%        
Mortgage and title coverage as percent of total value of proved oil and gas properties   90.00%        
Second Amendment to the Credit Agreement            
Line of Credit Facility [Line Items]            
Credit facility borrowing base $ 1,700,000,000   $ 1,700,000,000