INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current (expense) benefit	$ (112)	$ 295	$ 234
Deferred (expense) benefit	739	284	222
Total	$ 627	$ 579	$ 456