INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 116	$ 93	$ 82	$ 24
Additions based on tax positions related to prior year	16	0	49
Additions based on tax positions related to the current year	7	11	9
Balance at end of year	$ 116	$ 93	$ 82	$ 24