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DEBT - Note Repurchases (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Repurchases of debt      
Pre-tax gain on extinguishment of debt, net of a reduction in deferred issuance costs $ 5 $ 6  
Second Lien Notes (Second Priority Lien)      
Repurchases of debt      
Debt instrument, repurchased face amount $ 7 18  
Debt instrument, interest rate, stated percentage 8.00%   8.00%
Repurchase value of the principal amounts $ 3 14  
Pre-tax gain on extinguishment of debt, net of a reduction in deferred issuance costs $ 5 $ 6