INCOME TAXES - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 147	$ 21	$ (69)
State	30	1	(5)
Foreign	64	10	61
Total current	241	32	(13)
Deferred:
Federal	(66)	(137)	45
State	(1)	(31)	12
Foreign	11	(1)	15
Total deferred	(56)	(169)	72
Total income tax provision (benefit)	$ 185	$ (137)	$ 59