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LEASES - Operating Lease Costs (Details) - USD ($)
$ in Millions
 2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Operating lease costs      
Operating lease costs $ 2 $ 23 $ 52
Short-term lease costs 7 25 74
Variable lease costs 0 4 21
Total operating lease costs 9 52 147
Finance lease costs 0 1 0
Sublease income 0 (1) (1)
Total lease costs $ 9 52 146
Property, Plant and Equipment      
Operating lease costs      
Variable lease costs   $ 3 $ 19