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LEASES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Lessee, Lease, Description [Line Items]      
Short-term lease commitment     $ 1
Rent expense for operating leases $ 12 $ 10  
Minimum      
Lessee, Lease, Description [Line Items]      
Lessee, operating lease, renewal term     1 month
Maximum      
Lessee, Lease, Description [Line Items]      
Lessee, operating lease, renewal term     1 year