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Debt - Public Debt (Details) - USD ($)
3 Months Ended 6 Months Ended
May 21, 2020
Apr. 06, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Apr. 24, 2020
Debt Instrument [Line Items]            
Payment for early redemption of debt       $ 59,000,000 $ 0  
Early termination premium     $ 35,000,000      
Interest expense     $ 17,000,000      
6.150% Notes, due 2020            
Debt Instrument [Line Items]            
Early redemption of debt   $ 1,000,000,000        
Long-term debt, interest rate (percentage)   6.15% 6.15% 6.15%    
Payment for early redemption of debt   $ 1,020,000,000        
5.400% Notes due 2021            
Debt Instrument [Line Items]            
Early redemption of debt $ 589,000,000 $ 300,000,000        
Long-term debt, interest rate (percentage) 5.40% 5.40% 5.40% 5.40%    
Payment for early redemption of debt   $ 315,000,000        
Interest expense     $ 24,000,000      
6.875% Notes, due 2025            
Debt Instrument [Line Items]            
Long-term debt, interest rate (percentage)     6.875% 6.875%   6.875%
Aggregate principal amount           $ 1,200,000,000
Deferred financing costs     $ 14,000,000 $ 14,000,000    
5.870% Notes, due 2022            
Debt Instrument [Line Items]            
Early redemption of debt $ 151,000,000          
Long-term debt, interest rate (percentage) 5.87%   5.87% 5.87%    
Interest expense     $ 4,000,000