OPERATING LEASES - Other Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease, Cash paid for amounts included in the measurement of lease liabilities, operating	$ 19	$ 19
Operating lease, right-of-use assets obtained in exchange for lease obligations	$ 5	$ 22
Operating lease, weighted average remaining lease term (in years)	9 years 6 months 3 days	9 years 9 months 10 days
Operating lease, weighted average discount rate, percent	2.80%	3.00%