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DEBT - Second Lien Notes (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 31, 2014
Debt          
Pre-tax unamortized deferred gain on early extinguishment of debt and deferred issuance costs   $ 126 $ 57 $ 4  
Second Lien Notes (Second Priority Lien)          
Debt          
Interest rate (as a percent)   8.00% 8.00%    
Face value of debt reduction through payment or repurchase   $ 252 $ 183    
Repurchase value of the principal amounts of senior debt   156 159    
Pre-tax unamortized deferred gain on early extinguishment of debt and deferred issuance costs   $ 126 $ 48    
Financial performance covenants          
Percentage of principal amount at which notes can be redeemed in case of change control   101.00%      
Second Lien Notes (Second Priority Lien) | 8% Notes Due 2022          
Debt          
Aggregate principal amount issued $ 2,250        
Interest rate (as a percent) 8.00%        
Second Lien Notes (Second Priority Lien) | 8% Notes Due 2022 | Prior to December 15, 2018          
Financial performance covenants          
Percentage of principal amount at which notes can be redeemed prior to their maturity date   100.00%      
Redemption period start   Dec. 31, 2015      
Redemption period end   Dec. 14, 2018      
Second Lien Notes (Second Priority Lien) | 8% Notes Due 2022 | After December 15, 2020          
Financial performance covenants          
Percentage of principal amount at which notes can be redeemed in case of change control   100.00%      
Redemption period start   Jan. 01, 2021      
Redemption period end   Dec. 15, 2022      
Senior Notes (Unsecured)          
Debt          
Aggregate principal amount issued         $ 5,000
Proceeds from Second Lien Notes used to reduce principal amount of senior note debt through exchange $ 2,800        
Pre-tax unamortized deferred gain on early extinguishment of debt $ 560        
Financial performance covenants          
Percentage of principal amount at which notes can be redeemed in case of change control   101.00%      
Percentage of principal amount at which notes can be redeemed prior to their maturity date   100.00%      
Maximum | Second Lien Notes (Second Priority Lien) | 8% Notes Due 2022 | Between December 15, 2018 and 2020          
Financial performance covenants          
Percentage of principal amount at which notes can be redeemed prior to their maturity date   104.00%      
Minimum | Second Lien Notes (Second Priority Lien) | 8% Notes Due 2022 | Between December 15, 2018 and 2020          
Financial performance covenants          
Percentage of principal amount at which notes can be redeemed prior to their maturity date   102.00%