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Investments (Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, before allowance for credit losses $ 22,959 $ 23,055    
Financing receivable, before allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 100.60% 100.50%    
Financing receivable, allowance for credit losses $ (136) $ (119) $ (127) $ (123)
Financing receivable, allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses (0.60%) (0.50%)    
Financing receivable, net of allowance for credit losses $ 22,823 $ 22,936    
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 $ 13,529 $ 13,574    
Financing receivable, before allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 59.30% 59.20%    
Financing receivable, allowance for credit losses $ (64) $ (49) (69) (67)
Agricultural        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, before allowance for credit losses $ 4,388 $ 4,365    
Financing receivable, before allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 19.20% 19.00%    
Financing receivable, allowance for credit losses $ (14) $ (15) (15) (12)
Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, before allowance for credit losses $ 5,042 $ 5,116    
Financing receivable, before allowance for credit losses as a percentage of financing receivable, net of allowance for credit losses 22.10% 22.30%    
Financing receivable, allowance for credit losses $ (58) $ (55) $ (43) $ (44)