POLICYHOLDER ACCOUNT BALANCES - Aggregate Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 5,754	$ 3,374
Life Insurance & Employee Benefits Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	2,642	2,096
Individual Variable Annuity Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	3,100	1,265
Others
Policyholder Account Balance [Line Items]
Separate Accounts assets	12	13
Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	5,754	3,374
Mutual Funds | Life Insurance & Employee Benefits Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	2,642	2,096
Mutual Funds | Individual Variable Annuity Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	3,100	1,265
Mutual Funds | Others
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 12	$ 13