INCOME TAXES - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal	$ 1,019	$ 560	$ 139
States and Puerto Rico	93	41	58
Total current provision	1,112	601	197
Deferred expense	195	162	194
Provision for income taxes	$ 1,307	$ 763	$ 391