POLICYHOLDER ACCOUNT BALANCES - Aggregate Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 125,406	$ 121,497
Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	78	76
Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	2,260	2,213
Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	121,708	117,829
Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,360	1,379
Life Insurance & Employee Benefits Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	14,890	13,761
Life Insurance & Employee Benefits Products | Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	51	48
Life Insurance & Employee Benefits Products | Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	67	65
Life Insurance & Employee Benefits Products | Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	14,662	13,557
Life Insurance & Employee Benefits Products | Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	110	91
Individual Variable Annuity Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	71,040	70,854
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	35	34
Individual Variable Annuity Products | Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	71,000	70,815
Individual Variable Annuity Products | Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	4	4
Employer - Sponsored Products
Policyholder Account Balance [Line Items]
Separate Accounts assets	35,861	33,249
Employer - Sponsored Products | Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	7	21
Employer - Sponsored Products | Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	452	447
Employer - Sponsored Products | Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	35,388	32,780
Employer - Sponsored Products | Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	14	1
Other
Policyholder Account Balance [Line Items]
Separate Accounts assets	3,615	3,633
Other | Debt securities
Policyholder Account Balance [Line Items]
Separate Accounts assets	19	6
Other | Common Stock
Policyholder Account Balance [Line Items]
Separate Accounts assets	1,706	1,667
Other | Mutual Funds
Policyholder Account Balance [Line Items]
Separate Accounts assets	658	677
Other | Bonds and Notes
Policyholder Account Balance [Line Items]
Separate Accounts assets	$ 1,232	$ 1,283