LEASES - Summary of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease costs	$ 20	$ 21	$ 20
Financing lease costs	9	12	15
Total lease costs	$ 29	$ 33	$ 35