INCOME TAXES - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unrecognized tax benefits
Unrecognized tax benefit — January 1	$ 84	$ 56	$ 45
Gross increases — tax positions in current period	14	2	3
Gross increases — tax positions in prior periods	44	48	11
Gross decreases — tax positions in prior periods	(19)	(11)	(3)
Reduction due to settlements during the current period	(3)	(11)	0
Unrecognized tax benefit — December 31	$ 120	$ 84	$ 56