POLICYHOLDER ACCOUNT BALANCES - Aggregate Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 3,867	$ 3,374
Life Insurance & Employee Benefits Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	2,268	2,096
Individual Variable Annuity Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,586	1,265
Employer - Sponsored Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	0	0
Other
Policyholder Account Balance [Line Items]
Separate Accounts assets	13	13
Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	3,867	3,374
Mutual Funds | Life Insurance & Employee Benefits Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	2,268	2,096
Mutual Funds | Individual Variable Annuity Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,586	1,265
Mutual Funds | Employer - Sponsored Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	0	0
Mutual Funds | Other
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 13	$ 13