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Debt - Public Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
May 21, 2020
Apr. 06, 2020
Oct. 15, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 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    
1.63% Convertible Notes              
Debt Instrument [Line Items]              
Long-term debt, interest rate (percentage)     1.63%        
Early redemption of debt     $ 403,000,000        
6.150% Notes, due 2020              
Debt Instrument [Line Items]              
Long-term debt, interest rate (percentage)   6.15%     6.15%    
Early redemption of debt   $ 1,000,000,000          
Payment for early redemption of debt   $ 1,020,000,000          
5.400% Notes, due 2021              
Debt Instrument [Line Items]              
Long-term debt, interest rate (percentage) 5.40% 5.40%     5.40%    
Early redemption of debt $ 589,000,000 $ 300,000,000          
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%
Aggregate principal amount             $ 1,200,000,000
Deferred financing costs       $ 14,000,000      
5.870% Notes, due 2022              
Debt Instrument [Line Items]              
Long-term debt, interest rate (percentage) 5.87%       5.87%    
Early redemption of debt $ 151,000,000            
Interest expense         $ 4,000,000