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Debt (Senior Notes - Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2015
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Apr. 07, 2020
Dec. 31, 2019
Jul. 31, 2016
Debt Instrument [Line Items]                
Gain on extinguishment of debt   $ 7 $ 0 $ 35 $ 0      
Senior Notes                
Debt Instrument [Line Items]                
Gain on extinguishment of debt       $ 35        
Senior Notes | LIBOR                
Debt Instrument [Line Items]                
Incremental increase in basis points resulting from downgrades 0.25%              
Incremental decrease in basis points resulting from upgrades 0.25%              
4.95% Senior Notes due January 2025 | Senior Notes                
Debt Instrument [Line Items]                
Senior notes $ 1,000              
Stated interest rate 4.95% 6.20%   6.20%   6.45% 4.95%  
Stated interest rate cap               6.95%
Repurchased amount   $ 36   $ 36        
4.10% Senior Notes due March 2022 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate   4.10%   4.10%     4.10%  
Repurchased amount   $ 6   $ 6        
7.50% Senior Notes Due April 2026 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate   7.50%   7.50%        
Repurchased amount   $ 21   $ 21        
7.75% Senior Notes due October 2027 | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate   7.75%   7.75%        
Repurchased amount   $ 44   $ 44        
4.50% Senior Notes due January 2020 | Senior Notes                
Debt Instrument [Line Items]                
Repurchased amount   $ 72   $ 72