v3.25.2
Investments - Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments        
Realized gains (losses) on securities $ 2 $ (2) $ 5 $ 12
Net of tax        
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments        
Realized gains (losses) on securities before impairments 2 (2) 10 11
Impairment allowance on securities 0 0 (6) (2)
Realized gains (losses) on securities 2 (2) 4 9
Change in unrealized 40 (12) 101 (3)
Total pretax        
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments        
Realized gains (losses) on securities before impairments 2 (2) 12 14
Impairment allowance on securities 0 0 (7) (2)
Realized gains (losses) on securities 2 (2) 5 12
Change in unrealized 51 (15) 127 (4)
Fixed maturities        
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments        
Realized gains (losses) on securities before impairments (8) (1) (7) (5)
Impairment allowance on fixed maturity securities 0 0 (7) (2)
Realized gains (losses) on securities (8) (1) (14) (7)
Change in unrealized 51 (15) 127 (4)
Equity securities        
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments        
Realized gains (losses) on securities before impairments 10 (1) 19 19
Realized gains (losses) on securities 10 (1) 19 19
Change in unrealized 0 0 0 0
Mortgage loans and other investments        
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments        
Realized gains (losses) on securities before impairments 0 0 0 0
Impairment allowance on mortgage loans and other investments 0 0 0 0
Realized gains (losses) on securities 0 0 0 0
Change in unrealized 0 0 0 0
Total tax effects        
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments        
Realized gains (losses) on securities before impairments 0 0 (2) (3)
Impairment allowance on securities 0 0 1 0
Realized gains (losses) on securities 0 0 (1) (3)
Change in unrealized $ (11) $ 3 $ (26) $ 1