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Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses Reserves and Recoveries) (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves [1],[2] $ 998 $ 965
Insurance Loss Recoverable [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,623 1,595
U S Public Finance Insurance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 659 571
Loss and loss adjustment expense reserves [2] 577 551
U S Public Finance Insurance [Member] | Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 659 571
Loss and loss adjustment expense reserves [2] 528 551
International And Structured Finance Insurance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable [3] 1,404 1,461
Loss and loss adjustment expense reserves [2],[3] 764 668
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 428 418
International And Structured Finance Insurance [Member] | Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 964 1,024
Loss and loss adjustment expense reserves [2] 470 414
Intersegment Elimination [Member] | U S Public Finance Insurance [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 0 0
Loss and loss adjustment expense reserves (49) [2] 0
Intersegment 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] (440) (437)
Loss and loss adjustment expense reserves [2],[3] $ (294) $ (254)
[1] Amounts are net of expected recoveries of unpaid claims
[2] Amounts are net of expected recoveries.
[3] Includes loan repurchase commitments of $428 million and $418 million as of June 30, 2019 and December 31, 2018, respectively.