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Investments (Mortgage Loans - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 792   $ 792   $ 944  
Financing Receivable, Purchase 499 $ 204 1,500 $ 1,900    
Mortgage Loans, Gross $ 81,393   $ 81,393   $ 84,344  
Percentage of mortgage loans with LTV ratio in excess of 100% 1.00%   1.00%      
Percentage of Mortgage Loans Classified as Performing 99.00%   99.00%   99.00%  
Financing Receivable, Nonaccrual $ 848   $ 848   $ 1,117  
Mortgage Loans with LTV ratio in excess of 100% [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Mortgage Loans, Gross 814   814      
Commercial Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 191   191   209  
Deferred mortgage loan interest and principal payments due to COVID-19 42   42      
Mortgage Loans, Gross 51,336   51,336   52,434  
Financing Receivable, Nonaccrual 159   159   317 $ 176
Financing Receivable, Nonaccrual, No Allowance 0   0   168  
Residential Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 93   93   108  
Deferred mortgage loan interest and principal payments due to COVID-19 26   26      
Mortgage Loans, Gross 11,704   11,704   13,782  
Financing Receivable, Nonaccrual 438   438   534 418
Financing Receivable, Nonaccrual, No Allowance 0   0   0  
Agricultural Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 146   146   174  
Deferred mortgage loan interest and principal payments due to COVID-19 4   4      
Mortgage Loans, Gross 18,353   18,353   18,128  
Financing Receivable, Nonaccrual 251   251   266 $ 137
Financing Receivable, Nonaccrual, No Allowance $ 168   $ 168   $ 178