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Loss and Loss Adjustment Expense Reserves (Schedule of Losses and Loss Adjustment Expenses Reserves and Recoveries) (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Loss And Lae Reserves [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Loss and loss adjustment expense reserves $ 526 [1] $ 473 [1] $ 439
Insurance Loss Recoverable [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Insurance Loss Recoverable 185 183 $ 137
Non Variable Interest Entity [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Insurance Loss Recoverable 185 183  
Loss and loss adjustment expense reserves 526 473  
US Public Finance Insurance [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Insurance Loss Recoverable 165 152  
Loss and loss adjustment expense reserves [1] 299 230  
International And Structured Finance Insurance [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Insurance Loss Recoverable 23 32  
Loss and loss adjustment expense reserves [1] 238 335  
International And Structured Finance Insurance [Member] | Non Variable Interest Entity [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Insurance Loss Recoverable 20 31  
Loss and loss adjustment expense reserves [1] 227 243  
Consolidation Elimination [Member] | International And Structured Finance Insurance [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
Loss And Loss Adjustment Expense Reserves [Line Items]      
Insurance Loss Recoverable (3) (1)  
Loss and loss adjustment expense reserves [1] $ (11) $ (92)  
[1] Amounts are net of estimated recoveries of expected future claims.