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Investments (Rollforward of the Allowance for Credit Losses for Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, beginning of period $ 94 $ 66
Current period provision 4 24
PCD credit allowance 2 2
Financing receivable, allowance for credit losses, end of period 100 90
Commercial    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, beginning of period 44 27
Current period provision 6 17
PCD credit allowance 0  
Financing receivable, allowance for credit losses, end of period 50 44
Agricultural    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, beginning of period 15 17
Current period provision (2) (1)
PCD credit allowance 0  
Financing receivable, allowance for credit losses, end of period 13 16
Residential    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Financing receivable, allowance for credit losses, beginning of period 35 22
Current period provision 0 8
PCD credit allowance 2  
Financing receivable, allowance for credit losses, end of period $ 37 $ 30