INCOME TAXES - DOMESTIC AND FOREIGN COMPONENTS OF INCOME (LOSS) FROM CONTINUING OPERATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (15,322)	$ (1,632)	$ 3,431
Foreign	(383)	1,986	2,177
Income (loss) from continuing operations before income taxes	$ (15,705)	$ 354	$ 5,608