LEASES - Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 73	$ 77	$ 77
Variable operating lease cost	10	11	10
Sublease income	(18)	(18)	(16)
Short-term lease expense	0	0	2
Net lease cost	$ 65	$ 70	$ 72