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OPERATING LEASES - Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost $ 7 $ 6 $ 20 $ 20
Short-term lease cost 1 1 1 1
Variable lease cost 1 1 3 3
Total lease cost $ 9 $ 8 $ 24 $ 24