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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Revenues [1] $ 77 $ 103  
Net change in fair value of insured derivatives (5) (53)  
Net gains (losses) on financial instruments at fair value and foreign exchange (9) 17  
Net investment losses related to other-than-temporary impairments (1) (2)  
Net gains (losses) on extinguishment of debt 0 8  
Other net realized gains (losses) (1) 3  
Revenues of consolidated VIEs 12 1  
Inter-segment revenues [2] 0 0  
Total revenues 73 77  
Losses and loss adjustment 72 94  
Operating 24 36  
Interest 51 48  
Expenses of consolidated VIEs 22 19  
Inter-segment expenses [2] 0 0  
Total expenses 169 197  
Income (loss) before income taxes (96) (120)  
Provision (benefit) for income taxes 2 (48)  
Net income (loss) (98) (72)  
Identifiable assets 8,893 11,017 $ 9,095
U S Public Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Losses and loss adjustment 77 11  
Operating Segments [Member] | U S Public Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Revenues [1] 53 68  
Net change in fair value of insured derivatives 0 0  
Net gains (losses) on financial instruments at fair value and foreign exchange (6) 4  
Net investment losses related to other-than-temporary impairments (1) (2)  
Net gains (losses) on extinguishment of debt 0 0  
Other net realized gains (losses) 0 0  
Revenues of consolidated VIEs 0 0  
Inter-segment revenues [2] 7 5  
Total revenues 53 75  
Losses and loss adjustment 77 11  
Operating 3 10  
Interest 0 0  
Expenses of consolidated VIEs 0 0  
Inter-segment expenses [2] 15 15  
Total expenses 95 36  
Income (loss) before income taxes (42) 39  
Provision (benefit) for income taxes (9) 12  
Net income (loss) (33) 27  
Identifiable assets 4,508 5,128  
Operating Segments [Member] | Corporate Operations [Member]      
Segment Reporting Information [Line Items]      
Revenues [1] 7 8  
Net change in fair value of insured derivatives 0 0  
Net gains (losses) on financial instruments at fair value and foreign exchange 3 16  
Net investment losses related to other-than-temporary impairments 0 0  
Net gains (losses) on extinguishment of debt 0 8  
Other net realized gains (losses) (2) (1)  
Revenues of consolidated VIEs 0 0  
Inter-segment revenues [2] 13 16  
Total revenues 21 47  
Losses and loss adjustment 0 0  
Operating 13 18  
Interest 20 22  
Expenses of consolidated VIEs 0 0  
Inter-segment expenses [2] 6 1  
Total expenses 39 41  
Income (loss) before income taxes (18) 6  
Provision (benefit) for income taxes (33) (4)  
Net income (loss) 15 10  
Identifiable assets 1,159 2,335  
Operating Segments [Member] | International And Structured Finance Insurance [Member]      
Segment Reporting Information [Line Items]      
Revenues [1] 17 27  
Net change in fair value of insured derivatives (5) (53)  
Net gains (losses) on financial instruments at fair value and foreign exchange (6) (3)  
Net investment losses related to other-than-temporary impairments 0 0  
Net gains (losses) on extinguishment of debt 0 0  
Other net realized gains (losses) 1 4  
Revenues of consolidated VIEs 12 1  
Inter-segment revenues [2] 7 9  
Total revenues 26 (15)  
Losses and loss adjustment (5) 83  
Operating 8 8  
Interest 31 26  
Expenses of consolidated VIEs 22 19  
Inter-segment expenses [2] 6 14  
Total expenses 62 150  
Income (loss) before income taxes (36) (165)  
Provision (benefit) for income taxes (5) (57)  
Net income (loss) (31) (108)  
Identifiable assets 5,359 6,502  
Intersegment Elimination [Member]      
Segment Reporting Information [Line Items]      
Inter-segment revenues [2] (27) (30)  
Total revenues (27) (30)  
Inter-segment expenses [2] (27) (30)  
Total expenses (27) (30)  
Income (loss) before income taxes 0 0  
Provision (benefit) for income taxes 49 1  
Net income (loss) (49) (1)  
Identifiable assets $ (2,133) [3] $ (2,948) [4]  
[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 of intercompany reinsurance balances and repurchase agreements.
[4]
Consists of intercompany deferred income taxes, reinsurance balances and repurchase agreements.