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Loss and Loss Adjustment Expense Reserves (Schedule of Loss and Loss Adjustment Expenses Reserves) (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Loss And Loss Adjustment Expense Reserves [Line Items]    
Changes in unearned premium revenue $ (21) $ (24)
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Gross loss and LAE reserve, beginning balance [1] 526  
Loss payments for cases (134)  
Accretion of claim liability discount 15  
Changes in discount rates 11  
Changes in assumptions [2] 24  
Changes in unearned premium revenue 1  
Gross loss and LAE reserve, ending balance [1] $ 443  
[1] Amounts are net of estimated recoveries of expected future claims.
[2] Includes changes in amount and timing of estimated payments and recoveries.