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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables purchased from third parties $ 331 $ 86 $ 488 $ 563  
Accrued interest receivable $ 86   $ 86    
Financing receivables past due, COVID-19 pandemic modified loans 1.00%   1.00%    
Financing receivables in nonaccrual status, COVID-19 pandemic modified loans 1.00%   1.00%    
Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables in nonaccrual status, investment income     $ 1    
Performing | Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, before allowance for credit losses by performance status as a percentage of financing receivables, before allowance for credit losses 99.00%   99.00%   99.00%
Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables in nonaccrual status with no allowance for credit losses $ 8   $ 8