XML 48 R37.htm IDEA: XBRL DOCUMENT v3.21.1
Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses Reserves and Recoveries) (Detail) - USD ($)
$ in Millions
Mar. 31, 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] $ 990 $ 990
Insurance Loss Recoverable [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,622 1,677
Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,622 1,677
Loss and loss adjustment expense reserves 990 990
US Public Finance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 1,216 1,220
Loss and loss adjustment expense reserves [1] 524 469
International And Structured Finance Insurance [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable [3] 426 1,082
Loss and loss adjustment expense reserves [1],[3] 705 780
International And Structured Finance Insurance [Member] | Non Variable Interest Entity [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Insurance Loss Recoverable 406 457
Loss and loss adjustment expense reserves [1] 466 521
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] (20) (625)
Loss and loss adjustment expense reserves [1],[3] $ (239) $ (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.