INCOME TAXES - Summary of Valuation Allowance Against Certain Foreign Net Deferred Tax Assets and State Net Operating Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement in Valuation Allowance of Deferred Tax Assets [Roll Forward]
Balance at beginning of year	$ 5,991	$ 4,959	$ 3,947
State	1	67	41
U.S.	(97)	960	971
Foreign	7	5	0
Balance at end of year	$ 5,902	$ 5,991	$ 4,959