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Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period $ 800 $ 721
Provision (release) 589 231
Charge-offs, net of recoveries (128) (105)
Balance, end of period 1,261 847
Commercial Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 537 367
Provision (release) 527 212
Charge-offs, net of recoveries (120) (28)
Balance, end of period 944 551
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 179 182
Provision (release) 46 (21)
Charge-offs, net of recoveries 0 0
Balance, end of period 225 161
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 84 172
Provision (release) 16 40
Charge-offs, net of recoveries (8) (77)
Balance, end of period $ 92 $ 135