LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Policyholder Account Balance And Liability For Unpaid Claims And Claims Adjustment Expense (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	$ 16,474	$ 16,573
All Future Policyholder Benefits
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	15,026	15,140
Subtotal - Products
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	9,105	9,020
Term
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	1,291	1,341
Payout - Non-Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	802	844
Payout - Legacy
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	3,900	3,620
Group Pension - Benefit Reserve & DPL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	457	490
Health
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	1,414	1,505
UL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	1,241	1,220
Whole Life Closed Block and Open Block products
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	5,318	5,463
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	603	657
Other policyholder funds and dividends payable
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders' liabilities	$ 1,448	$ 1,433