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LEASES - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
lease
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]      
Number of leases with option to extend | lease 1    
Renewal term 5 years    
Operating lease expense $ 17 $ 19 $ 20
Operating lease payments 2    
Operating lease liability recognized in exchange for ROU asset $ 2    
Lease term (in years) 5 years 9 months 18 days    
Minimum      
Operating Leased Assets [Line Items]      
Term of contract (in years) 1 year    
Maximum      
Operating Leased Assets [Line Items]      
Term of contract (in years) 8 years