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Investments (Invested Assets on Deposit, Held In Trust and Pledged as Collateral) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Invested assets on deposit (regulatory deposits) $ 8,328 $ 7,999
Invested assets held in trust (reinsurance agreements) 5,857 5,621
Invested assets pledged as collateral 12,829 13,920
Total invested assets on deposit, held in trust and pledged as collateral $ 27,014 $ 27,540