Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Non-operated Sale) (Details)

v3.20.2
Subsequent Events (Non-operated Sale) (Details) - USD ($)
$ / shares in Units, shares in Thousands
Nov. 02, 2020
Sep. 30, 2020
Dec. 31, 2019
Oct. 03, 2016
Subsequent Event [Line Items]        
Warrants, term   5 years    
Warrant, exercise price (in dollars per share)   $ 5.60    
Total principal outstanding   $ 3,225,000,000 $ 3,185,000,000  
6.25% Senior Notes due 2023        
Subsequent Event [Line Items]        
Debt instrument, interest rate, stated (as a percent)       6.25%
Total principal outstanding   $ 650,000,000 650,000,000  
6.25% Senior Notes due 2023 | Unsecured debt        
Subsequent Event [Line Items]        
Debt instrument, interest rate, stated (as a percent)   6.25%   6.25%
6.125% Senior Notes due 2024        
Subsequent Event [Line Items]        
Debt instrument, interest rate, stated (as a percent)       6.125%
Total principal outstanding   $ 600,000,000 600,000,000  
6.125% Senior Notes due 2024 | Unsecured debt        
Subsequent Event [Line Items]        
Debt instrument, interest rate, stated (as a percent)   6.125%    
8.25% Senior Notes due 2025        
Subsequent Event [Line Items]        
Total principal outstanding   $ 250,000,000 250,000,000  
8.25% Senior Notes due 2025 | Unsecured debt        
Subsequent Event [Line Items]        
Debt instrument, interest rate, stated (as a percent)   8.25%    
6.375% Senior Unsecured Notes due 2026        
Subsequent Event [Line Items]        
Total principal outstanding   $ 400,000,000 400,000,000  
6.375% Senior Unsecured Notes due 2026 | Unsecured debt        
Subsequent Event [Line Items]        
Debt instrument, interest rate, stated (as a percent)   6.375%    
9.00% Second Lien Senior Secured Notes due 2025        
Subsequent Event [Line Items]        
Debt instrument, interest rate, stated (as a percent)   9.00%    
Total principal outstanding   $ 300,000,000 $ 0  
Subsequent Event        
Subsequent Event [Line Items]        
Exchanged amount $ 286,000,000.0      
Warrants to be issued (in warrants) 1,160      
Warrants, term 5 years      
Warrant, exercise price (in dollars per share) $ 5.60      
Additional face amount that can be exchanged $ 104,000,000.0      
Exchange agreement warrant eligibility cap 375,300,000      
Subsequent Event | Minimum        
Subsequent Event [Line Items]        
Benchmark of face amount exchange to increase number of warrants to be issued $ 286,000,000.0      
Subsequent Event | Maximum        
Subsequent Event [Line Items]        
Warrants to be issued (in warrants) 1,760      
Subsequent Event | 6.25% Senior Notes due 2023 | Unsecured debt        
Subsequent Event [Line Items]        
Amount exchanged per $1000 $ 650      
Subsequent Event | 6.125% Senior Notes due 2024 | Unsecured debt        
Subsequent Event [Line Items]        
Amount exchanged per $1000 575      
Subsequent Event | 8.25% Senior Notes due 2025 | Unsecured debt        
Subsequent Event [Line Items]        
Amount exchanged per $1000 480      
Subsequent Event | 6.375% Senior Unsecured Notes due 2026 | Unsecured debt        
Subsequent Event [Line Items]        
Amount exchanged per $1000 460      
Subsequent Event | 9.00% Second Lien Senior Secured Notes due 2025        
Subsequent Event [Line Items]        
Total principal outstanding $ 158,500,000