POLICYHOLDER ACCOUNT BALANCES - Aggregate Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 112,787	$ 111,479
Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	80	84
Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	2,107	2,189
Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	109,357	108,021
Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,243	1,185
Life Insurance & Employee Benefits Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	12,509	11,620
Life Insurance & Employee Benefits Products | Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	53	58
Life Insurance & Employee Benefits Products | Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	59	41
Life Insurance & Employee Benefits Products | Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	12,302	11,402
Life Insurance & Employee Benefits Products | Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	95	119
Individual Variable Annuity Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	66,676	68,256
Individual Variable Annuity Products | Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	1	1
Individual Variable Annuity Products | Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	33	32
Individual Variable Annuity Products | Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	66,639	68,220
Individual Variable Annuity Products | Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	3	3
Employer - Sponsored Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	30,210	28,087
Employer - Sponsored Products | Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	19	17
Employer - Sponsored Products | Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	457	430
Employer - Sponsored Products | Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	29,733	27,639
Employer - Sponsored Products | Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	1	1
Other
Policyholder Account Balance [Line Items]
Separate Accounts assets	3,392	3,516
Other | Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	7	8
Other | Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,558	1,686
Other | Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	683	760
Other | Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 1,144	$ 1,062