POLICYHOLDER ACCOUNT BALANCES - Reconciliation of Separate Account Liabilities to Separate Account Liability balance (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	$ 6,830	$ 5,754
Separate Accounts assets	6,830	5,754
Mutual Funds
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts assets	6,830	5,754
VUL
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	2,317	2,128	$ 1,792	$ 1,653
GMxB Core
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	2,710	2,166	950	756
IE
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	319	226	88	26
Reinsured
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	1,085	1,022	$ 966	$ 913
Other
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	399	212
Separate Accounts assets	12	12
Other | Mutual Funds
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts assets	12	$ 12
Employer - Sponsored Products
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts assets	38
Employer - Sponsored Products | Mutual Funds
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts assets	$ 38