LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS -Schedule of Balances of and Changes in Additional Liabilities Related to Insurance Guarantees (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for additional liability	$ 16,507		$ 16,573
Weighted Average Interest Rate	4.50%	4.50%
Assessments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	$ 164	$ 172
Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	14	$ 13
UL
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for additional liability	$ 1,228		1,220
Weighted Average Interest Rate	4.50%	4.50%
UL | Assessments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	$ 164	$ 172
UL | Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	14	13
Protection Solutions | UL
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period	1,220	1,120
Beginning balance before AOCI adjustments	1,230	1,135
Effect of changes in interest rate and cash flow assumptions and model changes			0	$ 0
Effect of actual variances from expected			1	6
Adjusted beginning of period balance			1,231	1,141
Interest accrual	14	13
Net assessments collected	17	18
Benefit payments	(21)	(18)
Ending balance before shadow reserve adjustments	1,241	1,154	$ 1,230	$ 1,135
Effect of reserve adjustment recorded in AOCI	(13)	(12)
Balance, end of period	1,228	1,142
Net liability for additional liability	1,228	1,142
Less: Reinsurance recoverable	(953)	(573)
Net liability for future policy benefits, after reinsurance recoverable	$ 275	$ 569
Weighted-average duration of additional liability - death benefit (years)	19 years 8 months 12 days	21 years 7 months 6 days