ACCRUED EXPENSES AND OTHER LIABILITIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accrued Liabilities and Other Liabilities [Abstract]
Benefit (charge) within operating expense	$ (18)	$ (18)	$ (1)