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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Revenues [1] $ 39 $ 53 $ 82 $ 108  
Net change in fair value of insured derivatives   (1)   13  
Net gains (losses) on financial instruments at fair value and foreign exchange 24 (26) (39) (4)  
Net investment losses related to other-than-temporary impairments   (9)   (37)  
Other net realized gains (losses)   1   2  
Revenues of consolidated VIEs 51 12 65 (2)  
Inter-segment revenues [2] 0 0 0 0  
Total revenues 114 30 108 80  
Losses and loss adjustment 136 140 379 102  
Operating 25 21 45 51  
Interest 45 52 92 104  
Expenses of consolidated VIEs 14 24 31 49  
Inter-segment expenses [2] 0 0 0 0  
Total expenses 220 237 547 306  
Income (loss) before income taxes (106) (207) (439) (226)  
Identifiable assets 6,613   6,613   $ 7,284
Operating Segments [Member] | U S Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 26 38 57 76  
Net change in fair value of insured derivatives   0   0  
Net gains (losses) on financial instruments at fair value and foreign exchange 25 17 7 57  
Net investment losses related to other-than-temporary impairments   (9)   (37)  
Other net realized gains (losses)   0   1  
Revenues of consolidated VIEs 0 20 0 6  
Inter-segment revenues [2] 8 8 14 15  
Total revenues 59 74 78 118  
Losses and loss adjustment 72 106 120 56  
Operating 3 2 5 4  
Interest 0 0 0 0  
Expenses of consolidated VIEs 0 0 0 0  
Inter-segment expenses [2] 11 12 25 27  
Total expenses 86 120 150 87  
Income (loss) before income taxes (27) (46) (72) 31  
Identifiable assets 3,868   3,868    
Operating Segments [Member] | Corporate Operations [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 5 8 11 15  
Net change in fair value of insured derivatives   0   0  
Net gains (losses) on financial instruments at fair value and foreign exchange 0 (33) (56) (51)  
Net investment losses related to other-than-temporary impairments   0   0  
Other net realized gains (losses)   0   (1)  
Revenues of consolidated VIEs 0 0 0 0  
Inter-segment revenues [2] 17 14 35 33  
Total revenues 22 (11) (10) (4)  
Losses and loss adjustment 0 0 0 0  
Operating 19 16 34 38  
Interest 16 20 32 39  
Expenses of consolidated VIEs 0 0 0 0  
Inter-segment expenses [2] 6 5 11 11  
Total expenses 41 41 77 88  
Income (loss) before income taxes (19) (52) (87) (92)  
Identifiable assets 1,021   1,021    
Operating Segments [Member] | International And Structured Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 8 7 14 17  
Net change in fair value of insured derivatives   (1)   13  
Net gains (losses) on financial instruments at fair value and foreign exchange (1) (10) 10 (10)  
Net investment losses related to other-than-temporary impairments   0   0  
Other net realized gains (losses)   1   2  
Revenues of consolidated VIEs 51 (9) 65 (9)  
Inter-segment revenues [2] 3 6 8 9  
Total revenues 61 (6) 97 22  
Losses and loss adjustment 64 34 259 46  
Operating 3 3 6 9  
Interest 29 32 60 65  
Expenses of consolidated VIEs 14 24 31 49  
Inter-segment expenses [2] 11 10 21 18  
Total expenses 121 103 377 187  
Income (loss) before income taxes (60) (109) (280) (165)  
Identifiable assets 4,077   4,077    
Intersegment Elimination [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 0 0 0 0  
Net change in fair value of insured derivatives   0   0  
Net gains (losses) on financial instruments at fair value and foreign exchange 0 0 0 0  
Net investment losses related to other-than-temporary impairments   0   0  
Other net realized gains (losses)   0   0  
Revenues of consolidated VIEs 0 1 0 1  
Inter-segment revenues [2] (28) (28) (57) (57)  
Total revenues (28) (27) (57) (56)  
Losses and loss adjustment 0 0 0 0  
Operating 0 0 0 0  
Interest 0 0 0 0  
Expenses of consolidated VIEs 0 0 0 0  
Inter-segment expenses [2] (28) (27) (57) (56)  
Total expenses (28) (27) (57) (56)  
Income (loss) before income taxes 0 $ 0 0 $ 0  
Identifiable assets [3] $ (2,353)   $ (2,353)    
[1] Represents the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements and other fees.
[2] Represents intercompany premium income and expense and intercompany interest income and expense pertaining to intercompany receivables and payables.
[3] Consists principally of intercompany reinsurance balances.