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Investments (Mortgage Loans - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 887   $ 887   $ 944
Financing Receivable, Purchase $ 1,100 $ 724 $ 3,000 $ 1,700  
Percentage of Mortgage Loans Classified as Performing 99.00%   99.00%   99.00%
Commercial Mortgage Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired Financing Receivable, Average Recorded Investment $ 0 0 $ 0 0  
Residential Mortgage Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired Financing Receivable, Average Recorded Investment 409 370 401 350  
Agricultural Mortgage Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impaired Financing Receivable, Average Recorded Investment $ 214 $ 124 $ 188 $ 104