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Investments (Mortgage Loans by Portfolio Segment) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 89,812 $ 93,227    
Allowance for Credit Loss (800) (721) $ (527) $ (634)
Total mortgage loans $ 89,012 $ 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 $ 36,843 $ 35,805    
Investment Income, Investment Expense 2,248 2,262 1,284  
Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 7,500 8,500    
Allowance for Credit Loss (77) (73)    
Other liabilities 7,500 8,500    
Mortgage Income On Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross Investment Income, Operating 355 408    
Mortgage Expense On Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investment Income, Investment Expense 355 408    
Commercial Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 56,310 60,326    
Allowance for Credit Loss $ (537) $ (367) (218) (340)
Percentage Of Mortgage Loans, Gross 63.30% 65.20%    
Commercial Mortgage Loans | Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 7,200 $ 8,200    
Residential Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 14,189 13,096    
Allowance for Credit Loss $ (179) $ (182) (190) (206)
Percentage Of Mortgage Loans, Gross 15.90% 14.20%    
Agricultural Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 19,313 $ 19,805    
Allowance for Credit Loss $ (84) $ (172) $ (119) $ (88)
Percentage Of Mortgage Loans, Gross 21.70% 21.40%    
Agricultural Mortgage Loans | Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 283 $ 246