LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Policyholder Account Balance And Liability For Unpaid Claims And Claims Adjustment Expense (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	$ 15,929	$ 15,935
All Future Policyholder Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	14,469	14,373
Subtotal - Products
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	8,323	8,078
Term
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	1,258	1,359
Payout - Non-Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	789	828
Payout - Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	3,192	2,689
Group Pension - Benefit Reserve & DPL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	475	523
Health
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	1,437	1,560
UL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	1,172	1,119
Whole Life Closed Block and Open Block products
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	5,524	5,687
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	622	608
Other policyholder funds and dividends payable
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	$ 1,460	$ 1,562