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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Gain (Loss) on Securities [Line Items]          
Mortgage loan losses due to changes in expected credit losses $ 0 $ 0 $ 5 $ 0  
Commitments to purchase or fund privately placed debt securities 1,775   1,775    
Commitments to sell various privately placed debt securities 60   60    
Fixed maturity securities          
Gain (Loss) on Securities [Line Items]          
Debt securities, available-for-sale, accrued interest, after allowance for credit loss 469 $ 451 469 $ 451 $ 442
Mortgage loans          
Gain (Loss) on Securities [Line Items]          
Financing receivable, accrued interest, after allowance for credit loss $ 5   $ 5