LEASES - Components of lease expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease costs	$ 11	$ 10	$ 10
Variable lease costs	20	16	20
Short-term lease costs	7	1	2
Finance lease cost
Amortization of right-of-use assets	4	4	2
Interest on lease liabilities	1	1	1
Total lease cost, net	$ 43	$ 32	$ 35