INCOME TAXES - Schedule of Provision for Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Other change in tax reserves	$ 2	$ 17	$ 4
Current income tax expense:
Current income tax expense	48	99	113
Deferred income tax (benefit) expense, net:
Deferred income tax expense (benefit), net	9	(108)	(7)
Total income tax expense (benefit)	$ 57	$ (9)	$ 106