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Debt (Senior Notes - Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2015
Mar. 31, 2020
Mar. 31, 2019
Apr. 07, 2020
Dec. 31, 2019
Jul. 31, 2018
Jul. 31, 2016
Debt Instrument [Line Items]              
Gain on extinguishment of debt   $ 28 $ 0        
Senior Notes              
Debt Instrument [Line Items]              
Gain on extinguishment of debt   $ 28          
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%            
4.10% Senior Notes due March 2022 | Senior Notes              
Debt Instrument [Line Items]              
Stated interest rate   4.10%     4.10%    
Repurchased amount   $ 3          
4.95% Senior Notes due January 2025 | Senior Notes              
Debt Instrument [Line Items]              
Senior notes $ 1,000            
Stated interest rate   4.95%     4.95% 6.20%  
Stated interest rate cap             6.95%
Repurchased amount   $ 28          
4.95% Senior Notes due January 2025 | Senior Notes | Subsequent event              
Debt Instrument [Line Items]              
Stated interest rate       6.45%      
7.50% Senior Notes Due April 2026 | Senior Notes              
Debt Instrument [Line Items]              
Stated interest rate   7.50%     7.50%    
Repurchased amount   $ 18          
7.75% Senior Notes due October 2027 | Senior Notes              
Debt Instrument [Line Items]              
Stated interest rate   7.75%     7.75%    
Repurchased amount   $ 31          
4.50% Senior Notes due January 2020 | Senior Notes              
Debt Instrument [Line Items]              
Repurchased amount   $ 52