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Investments (Loan Valuation Allowance for Mortgage Loans) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Allowance For Loan And Lease Losses Roll Forward    
Balance, Beginning of Period $ 64 $ 12
Provision (release) 0 14
Allowance for Loan and Lease Losses, Foreign Currency Translation (25) 38
Balance, End of Period $ 39 $ 64