LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Policyholder Account Balance And Liability For Unpaid Claims And Claims Adjustment Expense (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025	Sep. 30, 2025
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	$ 16,949	$ 17,660
Future policyholder benefits total
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	14,936	15,476
Subtotal
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	9,227	9,560
Whole Life Closed Block and Open Block products
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	4,782	4,980
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	927	936
Other policyholder funds and dividends payable
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	2,013	2,184
Retirement \| Payout
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	5,160	5,243	$ 5,119
Corporate & Other \| Term
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	1,138	1,241	1,263
Corporate & Other \| Group Pension - Benefit Reserve & DPL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	380	432	442
Corporate & Other \| Health
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	1,180	1,316	1,336
Corporate & Other \| UL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	$ 1,369	$ 1,328	$ 1,309