OPERATING LEASES - Other Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease, Cash paid for amounts included in the measurement of lease liabilities, operating	$ 13	$ 13
Operating lease, right-of-use assets obtained in exchange for lease obligations	$ 4	$ 4
Operating lease, weighted average remaining lease term (in years)	9 years 7 months 2 days	8 years 8 months 23 days
Operating lease, weighted average discount rate, percent	2.90%	3.10%