Insurance Liabilities (Reconciliation of Policyholder Account Balances) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 80,193	$ 72,602
Rollforwards Total
Policyholder Account Balance [Line Items]
Policyholder Account Balance	68,095	60,883
Funding agreements classified as investment contracts
Policyholder Account Balance [Line Items]
Policyholder Account Balance	11,115	10,689
Other investment contract liabilities
Policyholder Account Balance [Line Items]
Policyholder Account Balance	$ 983	$ 1,030