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Loss and Loss Adjustment Expense Reserves (Schedule of Loss and Loss Adjustment Expenses Reserves) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Loss And Loss Adjustment Expense Reserves [Line Items]      
Changes in unearned premium revenue $ 33 $ 34 $ 56
Loss And Lae Reserves [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Gross loss and LAE reserve, beginning balance 473 [1] 439  
Loss payments for cases (157) (214)  
Accretion of claim liability discount 19 15  
Changes in discount rates (19) (4)  
Changes in assumptions 212 [2] 235 [3]  
Changes in unearned premium revenue (2) 2  
Gross loss and LAE reserve, ending balance $ 526 [1] $ 473 [1] $ 439
[1] Amounts are net of estimated recoveries of expected future claims.
[2] Includes changes in amount and timing of estimated payments and recoveries.
[3] includes changes in amount and timing of estimated payments and recoveries.