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Investments (Net realized investment gains (losses)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fixed maturity securities:      
Gross gains $ 42 $ 48 $ 75
Gross losses (125) (150) (166)
Net investment gains (losses) on fixed maturity securities (83) (102) (91)
Equity securities 7 21 4
Derivatives 0 0 (1)
Mortgage loans (5) 0 (11)
Net investment gains (losses) $ (81) $ (81) $ (99)