Insurance Liabilities (Reconciliation of Policyholder Account Balances) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 85,015	$ 77,742
Rollforwards Total
Policyholder Account Balance [Line Items]
Policyholder Account Balance	72,251	65,703
Funding agreements classified as investment contracts
Policyholder Account Balance [Line Items]
Policyholder Account Balance	11,502	11,041
Institutional group annuities
Policyholder Account Balance [Line Items]
Policyholder Account Balance	343	0
Other investment contract liabilities
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 919	$ 998