LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Policyholder Account Balance And Liability For Unpaid Claims And Claims Adjustment Expense (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	$ 17,557	$ 17,613	$ 17,433
Future policyholder benefits total
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	15,275	15,508
Subtotal
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	9,277	9,403
Term
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	1,287	1,285
Payout
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	4,936	5,050
Group Pension - Benefit Reserve & DPL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	447	460
Health
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	1,336	1,362
UL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	1,271	1,246
Whole Life Closed Block and Open Block products
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	5,083	5,204
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	915	901
Other policyholder funds and dividends payable
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	$ 2,282	$ 2,105