OPERATING LEASES - Other Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease, Cash paid for amounts included in the measurement of lease liabilities, operating	$ 6	$ 7
Operating lease, right-of-use assets obtained in exchange for lease obligations	$ 4	$ 1
Operating lease, weighted average remaining lease term (in years)	9 years 7 months 20 days	8 years 10 months 9 days
Operating lease, weighted average discount rate, percent	2.90%	3.10%