LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Schedule of Liability for Future Policy Benefits, Revenue and Interest Accretion (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	$ 234	$ 273
Interest Accretion	212	192
Term
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	173	173
Interest Accretion	50	53
Payout - Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	39	76
Interest Accretion	74	47
Payout - Non-Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	16	17
Interest Accretion	29	30
Group Pension
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	0	0
Interest Accretion	15	16
Health
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premium	6	7
Interest Accretion	$ 44	$ 46