LIABILITIES FOR FUTURE POLICYHOLDER BENEFITS - Policyholder Account Balance And Liability For Unpaid Claims And Claims Adjustment Expense (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	$ 17,441	$ 17,660
Future policyholder benefits total
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	15,336	15,476
Subtotal
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	9,490	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	4,913	4,980
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	933	936
Other policyholder funds and dividends payable
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	2,105	2,184
Retirement \| Payout
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	5,243	5,243	$ 4,782
Corporate & Other \| Term
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	1,209	1,241	1,292
Corporate & Other \| Group Pension - Benefit Reserve & DPL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	417	432	454
Corporate & Other \| Health
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	1,274	1,316	1,353
Corporate & Other \| UL
Liability for Future Policy Benefit, Activity [Line Items]
Future policy benefits and other policyholders’ liabilities	$ 1,347	$ 1,328	$ 1,264