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Investments (Mortgage Loans - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ (737)   $ (737)   $ (744)  
Financing Receivable, Purchase $ 221 $ 462 $ 1,200 $ 2,200    
FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification 8 years   9 years      
Financing Receivable Modified Weighted Average Interest Rate Pre Modification     5.80%      
Financing Receivable Modified Weighted Average Interest Rate Post Modification     4.20%      
Mortgage Loans, Gross $ 92,935   $ 92,935   $ 84,290  
Percentage of mortgage loans with LTV ratio in excess of 100% 2.00%   2.00%      
Percentage of Mortgage Loans Classified as Performing 99.00%   99.00%   99.00%  
Financing Receivable, Nonaccrual $ 1,018   $ 1,018   $ 762  
Commercial Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 267   267   219  
Mortgage Loans, Gross 60,051   60,051   52,502  
Financing Receivable, Nonaccrual 365   365   169 $ 155
Financing Receivable, Nonaccrual, No Allowance 150   150   0  
Commercial Mortgage Loans | Extended Maturity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Troubled Debt Restructuring, Postmodification 145   367      
Residential Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 92   92   81  
Mortgage Loans, Gross 12,986   12,986   12,482  
Financing Receivable, Nonaccrual 418   418   462 442
Financing Receivable, Nonaccrual, No Allowance 0   0   0  
Residential Mortgage Loans | Extended Maturity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Troubled Debt Restructuring, Postmodification 1   6      
Residential Mortgage Loans | Extended Maturity And Payment Delay            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Troubled Debt Restructuring, Postmodification 6   15      
Residential Mortgage Loans | Extended Maturity , Payment Delay and Interest Reduction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Troubled Debt Restructuring, Postmodification     4      
Residential Mortgage Loans | Payment Deferral            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, Troubled Debt Restructuring, Postmodification 8   13      
Agricultural Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest Receivable 178   178   176  
Mortgage Loans, Gross 19,898   19,898   19,306  
Financing Receivable, Nonaccrual 235   235   131 $ 225
Financing Receivable, Nonaccrual, No Allowance $ 61   $ 61   $ 7  
Maximum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification     1 year      
Maximum | Commercial Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage Of Modified Loans During The Period 1.00%   1.00%      
Maximum | Residential Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage Of Modified Loans During The Period 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 $ 1,400   $ 1,400