Insurance Liabilities (Reconciliation of Policyholder Account Balances) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 87,240	$ 85,015
Rollforwards Total
Policyholder Account Balance [Line Items]
Policyholder Account Balance	75,636	72,251
Funding agreements classified as investment contracts
Policyholder Account Balance [Line Items]
Policyholder Account Balance	10,174	11,502
Institutional group annuities
Policyholder Account Balance [Line Items]
Policyholder Account Balance	566	343
Other investment contract liabilities
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 864	$ 919