v3.24.2.u1
Loss and Loss Adjustment Expense Reserves (Loss and LAE Activity) (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Loss And Loss Adjustment Expense Reserves [Line Items]          
Weighted average risk-free rates used to discount claim liability     4.47%   3.97%
Lae [Member]          
Loss And Loss Adjustment Expense Reserves [Line Items]          
Losses and loss adjustment $ 9 $ 3 $ 11 $ 5  
Loss and loss adjustment expense reserves $ 15   $ 15   $ 8
Changes in Loss and LAE Reserves     one-year