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DEBT - Note Repurchases (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Second Lien Notes and 6% Senior Notes due 2024      
Repurchases of debt      
Repurchase value of the principal amounts $ 30 $ 149  
Pre-tax gain on extinguishment of debt, net of a reduction in deferred issuance costs 2 26  
Second Lien Notes (Second Priority Lien)      
Repurchases of debt      
Principal amount of debt reduction through payment or repurchase $ 31 $ 128  
Debt instrument interest rate stated percentage 8.00% 8.00% 8.00%
Senior Notes (Unsecured) | 6% Senior Notes due 2024      
Repurchases of debt      
Principal amount of debt reduction through payment or repurchase $ 1 $ 49  
Debt instrument interest rate stated percentage 6.00% 6.00% 6.00%