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LEASES - Supplemental Cash Flows (Details) - USD ($)
$ in Millions
 2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating cash outflows from operating leases $ 2 $ 9 $ 14
Investing cash outflows from operating leases 0 14 40
Financing cash outflows from finance leases 0 1 0
ROU assets obtained in exchange for new operating lease liabilities 0 0 122
ROU assets obtained in exchange for new finance lease liabilities 0 0 2
Impairment charges related to ROU assets $ 0 $ 2 $ 3
Weighted-average remaining lease term (in years) 6 years 9 months 21 days   4 years 9 months
Weighted-average discount rate 4.50%   12.20%
Weighted-average remaining lease term (in years) 1 year 3 months 29 days   2 years 3 months 29 days
Weighted-average discount rate 4.00%   8.50%