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Investments (PCD Mortgage Loans) (Details) - Mortgage Loans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivables purchased with credit deterioration, purchase price $ 62 $ 462
PCD credit allowance 0 2
Financing receivables purchased with credit deterioration, discount or premium attributable to other factors 7 (29)
Financing receivables purchased with credit deterioration, par value $ 69 $ 435