LONG-TERM DEBT AND LEASE OBLIGATIONS - Senior Secured and Senior Secured Notes (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | |
|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| LONG-TERM DEBT AND LEASE OBLIGATIONS | |||
| Loss from early extinguishment of debt | $ 1 | $ 0 | |
| Senior Notes | |||
| LONG-TERM DEBT AND LEASE OBLIGATIONS | |||
| Repurchase of debt | $ 51 | ||
| Repurchase of debt, accrued and unpaid interest | 1 | ||
| Loss from early extinguishment of debt | (1) | ||
| Senior Notes | 6.750% due 2023 | |||
| LONG-TERM DEBT AND LEASE OBLIGATIONS | |||
| Repurchased face amount | $ 28 | $ 28 | |
| Interest rate, stated percentage | 6.75% | 6.75% | |
| Senior Notes | 7.000% due 2025 | |||
| LONG-TERM DEBT AND LEASE OBLIGATIONS | |||
| Repurchased face amount | $ 22 | $ 22 | |
| Interest rate, stated percentage | 7.00% | 7.00% | |