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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Revenues [1] $ 111 $ 130 $ 226 $ 269  
Net change in fair value of insured derivatives (8) 60 (36) 88  
Net gains (losses) on financial instruments at fair value and foreign exchange 14 45 (55) 75  
Net investment losses related to other-than-temporary impairments   (7) (1) (7)  
Net gains (losses) on extinguishment of debt 3 (1) 5 (1)  
Other net realized gains (losses) 0 (1) (1) 19  
Revenues of consolidated VIEs (2) 19 12 21  
Inter-segment revenues   0 0 0  
Total revenues 118 245 150 464  
Losses and loss adjustment 77 46 99 40  
Operating 40 45 85 93  
Interest 49 50 99 100  
Expenses of consolidated VIEs 7 12 23 26  
Inter-segment expenses   0 0 0  
Total expenses 173 153 306 259  
Income (loss) before income taxes (55) 92 (156) 205  
Provision (benefit) for income taxes (28) 28 (51) 72  
Net income (loss) (27) 64 (105) 133  
Identifiable assets 12,064 15,510 12,064 15,510 $ 14,836
U S Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Losses and loss adjustment 9 8 18 2  
Operating Segments [Member] | U S Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 82 93 166 198  
Net gains (losses) on financial instruments at fair value and foreign exchange 25   34 3  
Net investment losses related to other-than-temporary impairments 0 (6) 0 (6)  
Other net realized gains (losses) 0   0 (4)  
Inter-segment revenues [2] 4 8 10 18  
Total revenues 111 95 210 209  
Losses and loss adjustment 9 8 18 2  
Operating 11 8 20 18  
Inter-segment expenses [2] 16 22 34 46  
Total expenses 36 38 72 66  
Income (loss) before income taxes 75 57 138 143  
Provision (benefit) for income taxes 25 20 47 49  
Net income (loss) 50 37 91 94  
Identifiable assets 5,477 5,412 5,477 5,412  
Operating Segments [Member] | Corporate Operations [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 6 8 11 13  
Net gains (losses) on financial instruments at fair value and foreign exchange (19) 48 (103) 80  
Net investment losses related to other-than-temporary impairments 0 (1) (1) (1)  
Net gains (losses) on extinguishment of debt 3 (1) 5 (1)  
Other net realized gains (losses) (1) (1) (2) 23  
Inter-segment revenues [2] 12 21 28 37  
Total revenues 1 74 (62) 151  
Operating 14 19 36 38  
Interest 24 24 47 49  
Inter-segment expenses [2] 1 1 1 2  
Total expenses 39 44 84 89  
Income (loss) before income taxes (38) 30 (146) 62  
Provision (benefit) for income taxes (18) 7 (42) 25  
Net income (loss) (20) 23 (104) 37  
Identifiable assets 2,412 2,707 2,412 2,707  
Operating Segments [Member] | International And Structured Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues [1] 23 29 49 58  
Net change in fair value of insured derivatives (8) 60 (36) 88  
Net gains (losses) on financial instruments at fair value and foreign exchange 8 (3) 14 (8)  
Other net realized gains (losses) 1   1    
Revenues of consolidated VIEs (2) 19 12 21  
Inter-segment revenues [2] 11 15 23 33  
Total revenues 33 120 63 192  
Losses and loss adjustment 68 38 81 38  
Operating 15 18 29 37  
Interest 25 26 52 51  
Expenses of consolidated VIEs 7 12 23 26  
Inter-segment expenses [2] 11 15 25 33  
Total expenses 126 109 210 185  
Income (loss) before income taxes (93) 11 (147) 7  
Provision (benefit) for income taxes (32) 3 (55) 1  
Net income (loss) (61) 8 (92) 6  
Identifiable assets 7,017 10,393 7,017 10,393  
Intersegment Elimination [Member]          
Segment Reporting Information [Line Items]          
Inter-segment revenues [2] (27) (44) (61) (88)  
Total revenues (27) (44) (61) (88)  
Inter-segment expenses [2] (28) (38) (60) (81)  
Total expenses (28) (38) (60) (81)  
Income (loss) before income taxes 1 (6) (1) (7)  
Provision (benefit) for income taxes (3) (2) (1) (3)  
Net income (loss) 4 (4) 0 (4)  
Identifiable assets $ (2,842) [3] $ (3,002) [4] $ (2,842) [3] $ (3,002) [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 deferred income taxes, reinsurance balances and repurchase agreements.
[4] Consists of intercompany reinsurance balances, repurchase agreements and deferred income taxes.