INCOME TAXES - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal	$ 560	$ 139	$ 1,324
States and Puerto Rico	41	58	116
Total current provision	601	197	1,440
Deferred expense	162	194	132
Provision for income taxes	$ 763	$ 391	$ 1,572