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Investments (Mortgage Loans by Portfolio Segment) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 92,272   $ 93,227  
Allowance for Credit Loss (814) $ (692) (721) $ (527)
Total mortgage loans $ 91,458   $ 92,506  
Percentage Of mortgage total recorded investment To Mortgage Loans On Real Estate Commercial And Consumer Net 100.90%   100.80%  
Percentage of Allowance for Credit Losses for Financing Receivables (0.90%)   (0.80%)  
Percentage Of Mortgage Loans On Real Estate To Mortgage Loans On Real Estate Commercial And Consumer Net 100.00%   100.00%  
Other liabilities $ 36,158   $ 35,805  
Investment Income, Investment Expense 568 461    
Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 8,100   8,500  
Allowance for Credit Loss (77)   (73)  
Other liabilities 8,100   8,500  
Mortgage Income On Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross Investment Income, Operating 94      
Mortgage Expense On Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investment Income, Investment Expense 94      
Commercial Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 59,359   60,326  
Allowance for Credit Loss $ (461) (319) $ (367) (218)
Percentage Of Mortgage Loans, Gross 64.90%   65.20%  
Commercial Mortgage Loans | Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 7,800   $ 8,200  
Residential Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 13,201   13,096  
Allowance for Credit Loss $ (165) (212) $ (182) (190)
Percentage Of Mortgage Loans, Gross 14.40%   14.20%  
Agricultural Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 19,712   $ 19,805  
Allowance for Credit Loss $ (188) $ (161) $ (172) $ (119)
Percentage Of Mortgage Loans, Gross 21.60%   21.40%  
Agricultural Mortgage Loans | Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 251   $ 246