POLICYHOLDER ACCOUNT BALANCES - Reconciliation of Separate Account Liabilities to Separate Account Liability balance (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	$ 5,754	$ 3,374
VUL
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	2,128	1,653	$ 1,832
GMxB Core
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	2,166	756	315
IE
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	226	26
Reinsured
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	1,022	913	$ 1,244
Others
Liability for Future Policy Benefit, Activity [Line Items]
Separate Accounts liabilities	$ 212	$ 26