LEASES - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 12	$ 34	$ 12
Variable lease cost	1	0	1
Short-term lease cost	0	1	2
Sublease income	(1)	0	(1)
Lease, Cost	12	35	14
Cash paid for amounts included in the measurement of operating lease liabilities	(10)	(13)	(11)
Right-of-use assets obtained in exchange for new or acquired lease liabilities	$ 0	$ 40	$ 58