Insurance Liabilities (Reconciliation of Policyholder Account Balances) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 87,162	$ 80,193
Rollforwards Total
Policyholder Account Balance [Line Items]
Policyholder Account Balance	74,910	68,095
Funding agreements classified as investment contracts
Policyholder Account Balance [Line Items]
Policyholder Account Balance	11,002	11,115
Institutional group annuities
Policyholder Account Balance [Line Items]
Policyholder Account Balance	370	0
Other investment contract liabilities
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 880	$ 983