FRESH-START ACCOUNTING, Reconciliation of Enterprise Value to Reorganization Value (Details) $ in Millions  | 
 Oct. 31, 2019  
USD ($) 
 | 
|---|---|
| Reconciliation of Enterprise Value to Reorganization Value [Abstract] | |
| Enterprise Value | $ 1,250 | 
| Plus: Cash, cash equivalents and restricted cash | 251 | 
| Plus: Current Liabilities and other, noninterest bearing | 209 | 
| Plus: Other Long-term Liabilities, noninterest bearing (including Deferred Tax Liability) | 409 | 
| Total Reorganization Value | $ 2,119 | 
| X | ||||||||||
- Definition Amount of current restricted cash and cash equivalents at the balance sheet date after fresh-start adjustments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition Amount attributed to the reconstituted entity, as well as the expected net realizable value of those assets that will be disposed before reconstitution occurs. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
  | 
| X | ||||||||||
- Definition The enterprise value. No definition available. 
  | 
| X | ||||||||||
- Definition Total current liabilities and non-interest bearing at the balance sheet date after fresh-start adjustments. No definition available. 
  | 
| X | ||||||||||
- Definition Amount of other long-term liabilities, noninterest bearing including deferred tax liability at the balance sheet date after fresh-start adjustments. No definition available. 
  | 
| X | ||||||||||
- References No definition available. 
  |