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Investments (Invested Assets on Deposit, Held In Trust and Pledged as Collateral) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Invested assets on deposit (regulatory deposits) $ 8,529 $ 8,593
Invested assets held in trust (reinsurance agreements) 7,151 7,142
Invested assets pledged as collateral 14,155 13,979
Total invested assets on deposit, held in trust and pledged as collateral $ 29,835 $ 29,714