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Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses Reserves and Recoveries) (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Loss And Lae Reserves [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Loss and loss adjustment expense reserves [1],[2] $ 850 $ 990
Insurance Loss Recoverable [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,537 1,677
Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,537 1,677
Loss and loss adjustment expense reserves 850 990
US Public Finance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,286 1,220
Loss and loss adjustment expense reserves [1] 386 469
International And Structured Finance Insurance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable [3] 254 1,082
Loss and loss adjustment expense reserves [1],[3] 682 780
International And Structured Finance Insurance [Member] | Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 251 457
Loss and loss adjustment expense reserves [1] 464 521
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] (3) (625)
Loss and loss adjustment expense reserves [1],[3] $ (218) $ (259)
[1] Amounts are net of expected recoveries.
[2] Includes changes in amount and timing of estimated payments and recoveries.
[3] Includes loan repurchase commitments of $604 million as of December 31, 2020.