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Investments (Loan Valuation Allowance for Mortgage Loans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]      
Balance beginning $ 51 $ 35 $ 64
Provision 16 16 29
Balance ending $ 67 $ 51 $ 35