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Investments (Loan Valuation Allowance for Mortgage Loans) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Allowance For Loan And Lease Losses Roll Forward        
Balance, Beginning of Period $ 57 $ 38 $ 51 $ 35
Provision (release) 17 5 23 8
Balance, End of Period $ 74 $ 43 $ 74 $ 43