LEASES - Other Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating cash flows from operating leases	$ 7	$ 19
Operating cash flows from finance leases	0	0
Operating lease, right-of-use assets obtained in exchange for lease obligations	7	5
Finance lease, right-of-use assets obtained in exchange for lease obligations	$ 0	$ 0
Operating lease, weighted average remaining lease term (in years)	9 years 18 days	9 years 6 months 3 days
Finance lease, weighted average remaining lease term (in years)	24 years 1 month 17 days	0 years
Operating lease, weighted average discount rate, percent	2.50%	2.80%
Finance lease, weighted average discount rate, percent	1.90%	0.00%