INCOME TAXES - Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Uncertain Tax Positions
Balance at the beginning of the period	$ 74	$ 63
Interest and penalties, beginning balance	10	10
Total balance at beginning of the period	84	73
Current year tax positions: Additions	19	22
Current year tax positions: Reductions	(2)	(2)
Prior year tax positions: Additions	1	2
Prior year tax positions: Reductions	(1)	(2)
Lapse of applicable statute of limitations	(10)	(9)
Interest and penalties recognized in income tax expense	1
Balance at the end of the period	81	74
Interest and penalties, ending balance	11	10
Total balance at the end of the period	$ 92	$ 84