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Investments (Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, before allowance for credit losses $ 22,812 $ 22,645    
Financing receivable, allowance for credit losses (142) (137) $ (136) $ (119)
Financing receivable, net of allowance for credit losses $ 22,670 $ 22,508    
Financing receivable, before allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 100.60% 100.60%    
Financing receivable, allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses (0.60%) (0.60%)    
Financing receivable, after allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 100.00% 100.00%    
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, before allowance for credit losses $ 13,208 $ 13,193    
Financing receivable, allowance for credit losses $ (78) $ (69) (64) (49)
Financing receivable, before allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 58.30% 58.60%    
Agricultural        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, before allowance for credit losses $ 4,539 $ 4,445    
Financing receivable, allowance for credit losses $ (19) $ (19) (14) (15)
Financing receivable, before allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 20.00% 19.80%    
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, before allowance for credit losses $ 5,065 $ 5,007    
Financing receivable, allowance for credit losses $ (45) $ (49) $ (58) $ (55)
Financing receivable, before allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 22.30% 22.20%