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Investments (PCD Mortgage Loans) (Details) - Mortgage Loans
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Financing receivables purchased with credit deterioration, purchase price $ 77
Financing receivables purchased with credit deterioration, allowance at acquisition date 2
Financing receivables purchased with credit deterioration, discount or premium attributable to other factors 2
Financing receivables purchased with credit deterioration, par value $ 81