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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, 2020
Dec. 31, 2019
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves [1],[2] $ 1,018 $ 901
Insurance Loss Recoverable [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,543 1,694
Variable Interest Entity Primary Beneficiary [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loan repurchase commitments 524 486
Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,543 1,694
Loss and loss adjustment expense reserves 1,018 901
U S Public Finance Insurance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 950 911
Loss and loss adjustment expense reserves [2] 495 432
International And Structured Finance Insurance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable [3] 1,140 1,286
Loss and loss adjustment expense reserves [2],[3] 782 749
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 524 486
International And Structured Finance Insurance [Member] | Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 593 783
Loss and loss adjustment expense reserves [2] 523 469
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] (547) (503)
Loss and loss adjustment expense reserves [2],[3] $ (259) $ (280)
[1] Amounts are net of expected recoveries of unpaid claims.
[2] Amounts are net of expected recoveries.
[3] Includes loan repurchase commitments of $524 million and $486 million as of June 30, 2020 and December 31, 2019, respectively.