LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS -Schedule of Balances of and Changes in Additional Liabilities Related to Insurance Guarantees (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	$ 15,929		$ 15,935
Less: Reinsurance recoverable					$ (2,209)
Net liability for future policy benefits, after reinsurance recoverable					$ 6,252
Weighted Average Interest Rate	4.50%	4.50%
Assessments
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	$ 487	$ 473
Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	38	$ 36
UL
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Net liability for future policy benefits	$ 1,172		1,119
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	$ 487	$ 473
UL | Interest Accretion
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Revenue and Interest Accretion	38	36
Protection Solutions | UL
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]
Balance, beginning of period	1,120	1,082
Beginning balance before AOCI adjustments	1,135	1,076
Effect of changes in interest rate and cash flow assumptions and model changes			(12)	$ 8
Effect of actual variances from expected			14	11
Adjusted beginning of period balance			1,137	1,095
Interest accrual	38	36
Net assessments collected	49	49
Benefit payments	(38)	(45)
Ending balance before shadow reserve adjustments	1,186	1,135	$ 1,135	$ 1,076
Effect of reserve adjustment recorded in AOCI	(14)	(27)
Balance, end of period	1,172	1,108
Net liability for future policy benefits	1,172	1,108
Less: Reinsurance recoverable	(927)	(571)
Net liability for future policy benefits, after reinsurance recoverable	$ 245	$ 537
Weighted-average duration of liability for future policyholder benefits (years)	19 years 2 months 12 days	22 years