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Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses Reserves and Recoveries) (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves $ 806 $ 934
Insurance Loss Recoverable [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,583 1,564
U S Public Finance Insurance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 630 571
Loss and loss adjustment expense reserves 478 551
U S Public Finance Insurance [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves (75)  
U S Public Finance Insurance [Member] | Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 630  
Loss and loss adjustment expense reserves 403  
International And Structured Finance Insurance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable [1] 1,389 1,430
Loss and loss adjustment expense reserves [1] 668 637
International And Structured Finance Insurance [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable [1] (436) (437)
Loss and loss adjustment expense reserves [1] (265) (254)
International And Structured Finance Insurance [Member] | Variable Interest Entity Primary Beneficiary [Member] | Loan Repurchase Commitments [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loan repurchase commitments 420 418
International And Structured Finance Insurance [Member] | Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 953 993
Loss and loss adjustment expense reserves $ 403 $ 383
[1]
Includes loan repurchase commitments of $420 million and $418 million as of March 31, 2019 and December 31, 2018, respectively.