LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Balances of and Changes in Additional Liabilities Related to Insurance Guarantees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Apr. 01, 2023
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for additional liability	$ 1,653	$ 669
Net liability for additional liability, after reinsurance recoverable				$ 446
Weighted-average duration of additional liability - death benefit (years)	7 years 8 months 12 days
Assessments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	$ 477	18	$ 16
Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	11	3	$ 2
UL
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for additional liability	344
UL | Assessments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	477
UL | Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	$ 11
Universal Life
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for additional liability		$ 58
Weighted Average Interest Rate	4.50%	5.50%	5.50%
Universal Life | Assessments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion		$ 18	$ 16
Universal Life | Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion		3	2
Life Insurance & Employee Benefits Products | UL
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of year	$ 0
Beginning balance before AOCI adjustments	0
Effect of changes in interest rate and cash flow assumptions and model changes		6
Effect of actual variances from expected experience		2
Adjusted beginning of period balance		8
Issuances	322
Interest accrual	7
Net assessments collected	12
Benefit payments	(5)
Ending balance before shadow reserve adjustments	344	0
Effect of shadow reserve adjustment	0
Balance, end of year	344	0
Net liability for additional liability	344
Effect of reserve adjustment recorded in AOCI	0
Net liability for additional liability, after reinsurance recoverable	$ 344
Weighted-average duration of additional liability - death benefit (years)	17 years 8 months 12 days
Life Insurance & Employee Benefits Products | Universal Life
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of year	$ 58	57
Beginning balance before AOCI adjustments	$ 66	55
Effect of changes in interest rate and cash flow assumptions and model changes			1
Effect of actual variances from expected experience			(3)
Adjusted beginning of period balance			53
Issuances		0
Interest accrual		3
Net assessments collected		10
Benefit payments		0
Ending balance before shadow reserve adjustments		66	55
Effect of shadow reserve adjustment		(8)
Balance, end of year		58	$ 57
Net liability for additional liability		58
Effect of reserve adjustment recorded in AOCI		0
Net liability for additional liability, after reinsurance recoverable		$ 58
Weighted-average duration of additional liability - death benefit (years)		28 years 4 months 24 days