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Debt (Senior Notes - Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Apr. 26, 2018
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2016
Jan. 31, 2015
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jul. 31, 2018
Dec. 31, 2015
Debt Instrument [Line Items]                      
Stated interest rate   7.75%       7.75% 7.75%        
Gain (Loss) on Early Extinguishment of Debt             $ 8,000,000 $ (17,000,000) $ (70,000,000)    
Extinguishment of debt $ 1,191,000,000                    
Senior Notes                      
Debt Instrument [Line Items]                      
Gain (Loss) on Early Extinguishment of Debt     $ (9,000,000)     $ 8,000,000          
Payment of premiums     2,000,000                
Repayments of long-term debt     $ 900,000,000     $ 54,000,000          
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%            
Increase in basis spread       1.75%              
Senior Notes | 4.05% Senior Notes Due January 2020                      
Debt Instrument [Line Items]                      
Senior notes                     $ 850,000,000
Stated interest rate   4.05% 4.05% 5.80% 4.05% 4.05% 4.05% 4.05%   5.30%  
Debt stated interest rate cap       6.05%              
Debt repurchased face amount     $ 40,000,000         $ 40,000,000      
Extinguishment of debt   $ 52,000,000                  
Senior Notes | 4.95% Senior Notes Due January 2025                      
Debt Instrument [Line Items]                      
Senior notes         $ 1,000,000,000.0            
Stated interest rate   4.95%   6.70% 4.95% 4.95% 4.95%     6.20%  
Debt stated interest rate cap       6.95%              
Debt repurchased face amount   $ 35,000,000 73,000,000     $ 35,000,000 $ 35,000,000 73,000,000      
Senior Notes | 4.10% Senior Notes Due January March 2022                      
Debt Instrument [Line Items]                      
Stated interest rate   4.10%       4.10% 4.10%        
Debt repurchased face amount     $ 787,000,000         $ 787,000,000      
Senior Notes | 7.75% Senior Notes Due October 2027                      
Debt Instrument [Line Items]                      
Stated interest rate   7.75%       7.75% 7.75%        
Debt repurchased face amount   $ 16,000,000       $ 16,000,000 $ 16,000,000        
Senior Notes | 7.50% Senior Notes Due April 2026                      
Debt Instrument [Line Items]                      
Stated interest rate   7.50%       7.50% 7.50%        
Debt repurchased face amount   $ 11,000,000       $ 11,000,000 $ 11,000,000