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Investments (Rollforward of the Allowance for Credit Losses for Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, beginning of period $ 119 $ 123
Current period provision 17 4
Financing receivable, allowance for credit losses, end of period 136 127
Commercial    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, beginning of period 49 67
Current period provision 15 2
Financing receivable, allowance for credit losses, end of period 64 69
Agricultural    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, beginning of period 15 12
Current period provision (1) 3
Financing receivable, allowance for credit losses, end of period 14 15
Residential    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, beginning of period 55 44
Current period provision 3 (1)
Financing receivable, allowance for credit losses, end of period $ 58 $ 43