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NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER - Reorganization Items, net (Details) - USD ($)
$ in Millions
 2 Months Ended 10 Months Ended 12 Months Ended
Oct. 31, 2020
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
NATURE OF BUSINESS, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND OTHER          
Gain on settlement of liabilities subject to compromise   $ 0 $ 4,022    
Unamortized deferred gain and issuance costs, net   0 125    
Junior debtor-in-possession exit fee   0 (12)    
Acceleration of unrecognized compensation expense on cancelled stock-based compensation awards   0 (5)    
Write-off of prepaid directors and officers' insurance premiums   0 (2)    
Total non-cash reorganization items   0 4,128 $ 0 $ 0
Legal, professional and other, net $ (15) (3) (43)    
Debtor-in-possession financing costs   0 (25)    
Total reorganization items, net   $ (3) $ 4,060 $ 0 $ 0