EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expenses associated with plans	$ 9	$ 21	$ 60
Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Expenses associated with plans	32	47	70
Equitable 401(k) Plan
Defined Benefit Plan Disclosure [Line Items]
Expenses associated with plans	$ 19	$ 22	$ 19