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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Revenues $ 123 [1] $ 177 [2] $ 392 [1] $ 454 [2]  
Net change in fair value of insured derivatives 3 24 91 446  
Net gains (losses) on financial instruments at fair value and foreign exchange (55) 57 20 63  
Net investment losses related to other-than-temporary impairments (3) (14) (10) (14)  
Net gains (losses) on extinguishment of debt 0   (1) 3  
Other net realized gains (losses) (1) 30 18 31  
Revenues of consolidated VIEs 25 17 46 72  
Inter-segment revenues 0 [3] 0 [4] 0 [3] 0 [4]  
Total revenues 92 291 556 1,055  
Losses and loss adjustment 39 20 79 82  
Operating 46 59 139 172  
Interest 49 52 149 158  
Expenses of consolidated VIEs 13 12 39 36  
Inter-segment expenses 0 [3] 0 [4] 0 [3] 0 [4]  
Total expenses 147 143 406 448  
Income (loss) before income taxes (55) 148 150 607  
Provision (benefit) for income taxes (20) (25) 52 58  
Net income (loss) (35) 173 98 549  
Identifiable assets 15,051 16,201 15,051 16,201 $ 16,284
U S Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Losses and loss adjustment (7) (8) (5) (5)  
Operating Segments [Member] | U S Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues 90 [1] 100 [2] 288 [1] 272 [2]  
Net change in fair value of insured derivatives       1  
Net gains (losses) on financial instruments at fair value and foreign exchange 1 2 4 21  
Net investment losses related to other-than-temporary impairments (3) (14) (9) (14)  
Other net realized gains (losses) 0 18 (4) 18  
Inter-segment revenues 8 [3] 7 [4] 26 [3] 30 [4]  
Total revenues 96 113 305 328  
Losses and loss adjustment (7) (8) (5) (5)  
Operating 11 9 29 29  
Inter-segment expenses 21 [3] 18 [4] 67 [3] 56 [4]  
Total expenses 25 19 91 80  
Income (loss) before income taxes 71 94 214 248  
Provision (benefit) for income taxes 25 38 74 90  
Net income (loss) 46 56 140 158  
Identifiable assets 5,432 6,132 5,432 6,132  
Operating Segments [Member] | Corporate Operations [Member]          
Segment Reporting Information [Line Items]          
Revenues 5 [1] 7 [2] 18 [1] 30 [2]  
Net gains (losses) on financial instruments at fair value and foreign exchange (45) 68 35 56  
Net investment losses related to other-than-temporary impairments 0   (1)    
Net gains (losses) on extinguishment of debt 0   (1) 3  
Other net realized gains (losses) (1) 1 22 2  
Inter-segment revenues 16 [3] 12 [4] 53 [3] 38 [4]  
Total revenues (25) 88 126 129  
Losses and loss adjustment     0    
Operating 18 25 56 64  
Interest 24 26 73 78  
Inter-segment expenses 1 [3]   3 [3] 7 [4]  
Total expenses 43 51 132 149  
Income (loss) before income taxes (68) 37 (6) (20)  
Provision (benefit) for income taxes (25) (70) 0 (167)  
Net income (loss) (43) 107 (6) 147  
Identifiable assets 2,514 2,735 2,514 2,735  
Operating Segments [Member] | International And Structured Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues 28 [1] 67 [2] 86 [1] 142 [2]  
Net change in fair value of insured derivatives 3 24 91 445  
Net gains (losses) on financial instruments at fair value and foreign exchange (11) (13) (19) (11)  
Other net realized gains (losses)   11   11  
Revenues of consolidated VIEs 25 21 46 72  
Inter-segment revenues 15 [3] 12 [4] 48 [3] 36 [4]  
Total revenues 60 122 252 695  
Losses and loss adjustment 46 28 84 87  
Operating 17 17 54 49  
Interest 25 26 76 80  
Expenses of consolidated VIEs 13 12 39 36  
Inter-segment expenses 17 [3] 16 [4] 50 [3] 51 [4]  
Total expenses 118 99 303 303  
Income (loss) before income taxes (58) 23 (51) 392  
Provision (benefit) for income taxes (20) 9 (19) 137  
Net income (loss) (38) 14 (32) 255  
Identifiable assets 10,084 10,373 10,084 10,373  
Operating Segments [Member] | Advisory Services [Member]          
Segment Reporting Information [Line Items]          
Revenues [2]   3   10  
Net gains (losses) on financial instruments at fair value and foreign exchange       (3)  
Revenues of consolidated VIEs   (4)   (4)  
Inter-segment revenues [4]   5   17  
Total revenues   4   20  
Operating   8   30  
Inter-segment expenses [4]   2   5  
Total expenses   10   35  
Income (loss) before income taxes   (6)   (15)  
Provision (benefit) for income taxes   (2)   (3)  
Net income (loss)   (4)   (12)  
Identifiable assets   481   481  
Operating Segments [Member] | Conduit [Member]          
Segment Reporting Information [Line Items]          
Revenues of consolidated VIEs       4  
Inter-segment revenues [4]       (1)  
Total revenues   0   3  
Inter-segment expenses [4]   0   9  
Total expenses   0   9  
Income (loss) before income taxes   0   (6)  
Provision (benefit) for income taxes   0   (2)  
Net income (loss)   0   (4)  
Intersegment Elimination [Member]          
Segment Reporting Information [Line Items]          
Inter-segment revenues (39) [3] (36) [4] (127) [3] (120) [4]  
Total revenues (39) (36) (127) (120)  
Inter-segment expenses (39) [3] (36) [4] (120) [3] (128) [4]  
Total expenses (39) (36) (120) (128)  
Income (loss) before income taxes 0 0 (7) 8  
Provision (benefit) for income taxes 0 0 (3) 3  
Net income (loss) 0 0 (4) 5  
Identifiable assets [5] $ (2,979) $ (3,520) $ (2,979) $ (3,520)  
[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 the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements, investment management fees and other fees.
[3] Represents intercompany premium income and expense and intercompany interest income and expense pertaining to intercompany receivables and payables.
[4] Represents intercompany premium income and expense, intercompany asset management fees and expenses and intercompany interest income and expense pertaining to intercompany receivables and payables.
[5] Consists of intercompany reinsurance balances, repurchase agreements and deferred income taxes.