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Investments (Mortgage Loans - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 945   $ 945   $ 852  
Financing Receivable, Purchase $ 204 $ 815 $ 1,400 $ 2,600    
Percentage of Mortgage Loans Classified as Performing 99.00%   99.00%   99.00%  
Financing Receivable, Nonaccrual $ 992   $ 992   $ 681  
Mortgage Loans, Gross $ 66,378   $ 66,378   65,591  
Percentage of mortgage loans with LTV ratio in excess of 100% 1.00%   1.00%      
Mortgage Loans with LTV ratio in excess of 100% [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Mortgage Loans, Gross $ 542   $ 542      
Commercial Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 167   167   155  
Deferred mortgage loan interest and principal payments due to COVID-19 46   46      
Financing Receivable, Nonaccrual 302   302   167 $ 167
Financing Receivable, Nonaccrual, No Allowance 156   156   0  
Mortgage Loans, Gross 38,124   38,124   37,311  
Residential Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 98   98   89  
Deferred mortgage loan interest and principal payments due to COVID-19 20   20      
Financing Receivable, Nonaccrual 496   496   377 402
Financing Receivable, Nonaccrual, No Allowance 0   0   0  
Mortgage Loans, Gross 12,381   12,381   12,575  
Agricultural Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 152   152   176  
Deferred mortgage loan interest and principal payments due to COVID-19 5   5      
Financing Receivable, Nonaccrual 194   194   137 $ 105
Financing Receivable, Nonaccrual, No Allowance 139   139   93  
Mortgage Loans, Gross $ 15,873   $ 15,873   $ 15,705