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Investments (Mortgage Loans by Portfolio Segment) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 93,227 $ 84,290    
Allowance for Credit Loss (721) (527) $ (634) $ (590)
Total mortgage loans $ 92,506 $ 83,763    
Percentage Of mortgage total recorded investment To Mortgage Loans On Real Estate Commercial And Consumer Net 100.80% 100.60%    
Percentage of Allowance for Credit Losses for Financing Receivables 0.80% 0.60%    
Percentage Of Mortgage Loans On Real Estate To Mortgage Loans On Real Estate Commercial And Consumer Net 100.00% 100.00%    
Other liabilities $ 35,805 $ 25,933    
Investment Income, Investment Expense 2,262 1,284 949  
Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 8,500      
Allowance for Credit Loss (73)      
Other liabilities 8,500      
Mortgage Income On Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross Investment Income, Operating 408      
Mortgage Expense On Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Investment Income, Investment Expense 408      
Commercial Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 60,326 52,502    
Allowance for Credit Loss $ (367) $ (218) (340) (252)
Percentage Of Mortgage Loans, Gross 65.20% 62.70%    
Commercial Mortgage Loans | Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 8,200      
Residential Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross 13,096 $ 12,482    
Allowance for Credit Loss $ (182) $ (190) (206) (232)
Percentage Of Mortgage Loans, Gross 14.20% 14.90%    
Agricultural Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 19,805 $ 19,306    
Allowance for Credit Loss $ (172) $ (119) $ (88) $ (106)
Percentage Of Mortgage Loans, Gross 21.40% 23.00%    
Agricultural Mortgage Loans | Loans Originated For Third Party        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Loans, Gross $ 246