v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Realized gains (losses) and changes in unrealized appreciation (depreciation) related to fixed maturity and equity security investments        
Realized gains (losses) on securities $ 16 $ 2 $ (2) $ 5
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 16 2 5 10
Impairment allowance on securities (2) 0 (6) (6)
Realized gains (losses) on securities 14 2 (1) 4
Change in unrealized (12) 40 (90) 101
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 19 2 6 12
Impairment allowance on securities (3) 0 (8) (7)
Realized gains (losses) on securities 16 2 (2) 5
Change in unrealized (16) 51 (114) 127
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 (11) (8) (12) (7)
Impairment allowance on fixed maturity securities (3) 0 (8) (7)
Realized gains (losses) on securities (14) (8) (20) (14)
Change in unrealized (16) 51 (114) 127
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 30 10 18 19
Realized gains (losses) on securities 30 10 18 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 (3) 0 (1) (2)
Impairment allowance on securities 1 0 2 1
Realized gains (losses) on securities (2) 0 1 (1)
Change in unrealized $ 4 $ (11) $ 24 $ (26)