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Share-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
May 05, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 18,000,000        
Cash retention incentives capitalized to other current assets 15,000,000        
Difference between cash and cash retention incentives $ 10,000,000        
Participating securities          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Intrinsic value of restricted stock, vested       $ 1,000,000  
Unrecognized compensation expense   $ 1,000,000   $ 1,000,000  
Share-based compensation expense, weighted average period for recognition       1 year 1 month 20 days  
Stock option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense   0   $ 0  
Stock option | Management          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, award vesting period       3 years  
Stock option | Management | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period       7 years  
Stock option | Management | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period       10 years  
Performance Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, award vesting period       3 years  
Share-based compensation expense   $ 0 $ 0 $ (4,000,000) $ 12,000,000
Cash Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation, award vesting period       3 years