INCOME TAXES - Components of Earnings Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S.	$ (320)	$ 549	$ 1,311
Non-U.S.	(146)	1,050	1,034
(LOSS) INCOME BEFORE INCOME TAXES	$ (466)	$ 1,599	$ 2,345