LEASES - Operating Leases Recognized in the Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Lease expense	$ 185	$ 194	$ 183
Variable lease expense	46	46	56
Less: Sublease income	(3)	(2)	(2)
Total lease expense, net of sublease income	$ 228	$ 238	$ 237