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Business Segments (Summary Of Company's Segment Results) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Revenues $ 151 [1] $ 225 [2] $ 483 [1] $ 683 [1]  
Net change in fair value of insured derivatives 257 (21) 14 1,053  
Net gains (losses) on financial instruments at fair value and foreign exchange 5 7 62 (18)  
Net investment losses related to other-than-temporary impairments 0 (8) 0 (105)  
Net gains (losses) on extinguishment of debt 6 0 49 0  
Other net realized gains (losses) (29) 1 (29) 7  
Revenues of consolidated VIEs 30 77 172 83  
Inter-segment revenues 0 [3] 0 [3] 0 [3] 0 [3]  
Total revenues 420 281 751 1,703  
Losses and loss adjustment 98 171 92 330  
Operating 80 80 316 343  
Interest 59 69 179 214  
Expenses of consolidated VIEs 12 18 42 57  
Inter-segment expenses 0 [3] 0 [3] 0 [3] 0 [3]  
Total expenses 249 338 629 944  
Income (loss) before income taxes 171 (57) 122 759  
Identifiable assets 17,633 22,132 17,633 22,132 21,724
Reportable Subsegments [Member] | Asset Liability Products Business [Member]
          
Segment Reporting Information [Line Items]          
Revenues 6 [4] 9 [4] 21 [4] 44 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange (29) (40) (38) (160)  
Net investment losses related to other-than-temporary impairments 0 0 0 (56)  
Net gains (losses) on extinguishment of debt 7 0 11 0  
Other net realized gains (losses) 0 0 0 0  
Revenues of consolidated VIEs 0 0 0 0  
Inter-segment revenues (1) [5] (1) [5] (3) [5] (15) [5]  
Total revenues (17) (32) (9) (187)  
Operating 0 1 1 4  
Interest 19 22 59 72  
Expenses of consolidated VIEs 0 0 0 0  
Inter-segment expenses 2 [5] 3 [5] 6 [5] 16 [5]  
Total expenses 21 26 66 92  
Income (loss) before income taxes (38) (58) (75) (279)  
Identifiable assets 1,586 2,219 1,586 2,219  
Reportable Subsegments [Member] | Conduits [Member]
          
Segment Reporting Information [Line Items]          
Revenues 0 [4] 0 [4] 0 [4] 0 [4]  
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 0 0  
Net gains (losses) on extinguishment of debt 0 0 0 0  
Other net realized gains (losses) 0 0 0 0  
Revenues of consolidated VIEs 1 20 8 60  
Inter-segment revenues (2) [5] 0 [5] (8) [5] (2) [5]  
Total revenues (1) 20 0 58  
Operating 0 0 0 0  
Interest 0 0 0 0  
Expenses of consolidated VIEs 0 3 4 11  
Inter-segment expenses 15 [5] 36 [5] 26 [5] 71 [5]  
Total expenses 15 39 30 82  
Income (loss) before income taxes (16) (19) (30) (24)  
Identifiable assets 198 693 198 693  
Intersubsegment Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Revenues 0 [4] 0 [4] 0 [4] 0 [4]  
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 0 0  
Net gains (losses) on extinguishment of debt 0 0 0 0  
Other net realized gains (losses) 0 0 0 0  
Revenues of consolidated VIEs 0 0 0 0  
Inter-segment revenues 0 [5] 0 [5] 6 [5] (2) [5]  
Total revenues 0 0 6 (2)  
Operating 0 0 0 0  
Interest 0 0 0 0  
Expenses of consolidated VIEs 0 0 0 0  
Inter-segment expenses 0 [5] 0 [5] 0 [5] 0 [5]  
Total expenses 0 0 0 0  
Income (loss) before income taxes 0 0 6 (2)  
Identifiable assets 1 (51) 1 (51)  
U S Public Finance Insurance [Member]
          
Segment Reporting Information [Line Items]          
Losses and loss adjustment     105    
Operating Segments [Member] | U S Public Finance Insurance [Member]
          
Segment Reporting Information [Line Items]          
Revenues 93 [1] 149 [2] 314 [1] 419 [1]  
Net change in fair value of insured derivatives 0 0 0 0  
Net gains (losses) on financial instruments at fair value and foreign exchange 0 22 30 43  
Net investment losses related to other-than-temporary impairments 0 0 0 0  
Net gains (losses) on extinguishment of debt 0 0 0 0  
Other net realized gains (losses) (29) 0 (29) 0  
Revenues of consolidated VIEs 0 0 0 0  
Inter-segment revenues 10 [3] 43 [3] 81 [3] 123 [3]  
Total revenues 74 214 396 585  
Losses and loss adjustment 35 4 105 15  
Operating 13 14 57 112  
Interest 0 0 0 0  
Expenses of consolidated VIEs 0 0 0 0  
Inter-segment expenses 20 [3] 32 [3] 72 [3] 91 [3]  
Total expenses 68 50 234 218  
Income (loss) before income taxes 6 164 162 367  
Identifiable assets 6,509 7,134 6,509 7,134  
Operating Segments [Member] | Structured Finance And International Insurance [Member]
          
Segment Reporting Information [Line Items]          
Revenues 39 [1] 59 [2] 120 [1] 194 [1]  
Net change in fair value of insured derivatives 257 (21) 14 1,053  
Net gains (losses) on financial instruments at fair value and foreign exchange (3) 14 31 80  
Net investment losses related to other-than-temporary impairments 0 (4) 0 (45)  
Net gains (losses) on extinguishment of debt 0 0 0 0  
Other net realized gains (losses) 0 0 0 1  
Revenues of consolidated VIEs 30 57 174 23  
Inter-segment revenues 20 [3] 29 [3] 52 [3] 10 [3]  
Total revenues 343 134 391 1,316  
Losses and loss adjustment 63 167 (13) 315  
Operating 22 29 91 120  
Interest 27 33 84 99  
Expenses of consolidated VIEs 12 15 38 46  
Inter-segment expenses 23 [3] 54 [3] 115 [3] 154 [3]  
Total expenses 147 298 315 734  
Income (loss) before income taxes 196 (164) 76 582  
Identifiable assets 12,096 17,399 12,096 17,399  
Operating Segments [Member] | Advisory Services [Member]
          
Segment Reporting Information [Line Items]          
Revenues 3 [1] 5 [2] 13 [1] 16 [1]  
Net change in fair value of insured derivatives 0 0 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 0 0  
Net gains (losses) on extinguishment of debt 0 0 0 0  
Other net realized gains (losses) 0 0 0 0  
Revenues of consolidated VIEs 0 0 0 0  
Inter-segment revenues 8 [3] 8 [3] 20 [3] 26 [3]  
Total revenues 11 13 33 42  
Losses and loss adjustment 0 0 0 0  
Operating 16 12 42 38  
Interest 0 0 0 0  
Expenses of consolidated VIEs 0 0 0 0  
Inter-segment expenses 3 [3] 3 [3] 6 [3] 10 [3]  
Total expenses 19 15 48 48  
Income (loss) before income taxes (8) (2) (15) (6)  
Identifiable assets 47 53 47 53  
Operating Segments [Member] | Corporate Operations [Member]
          
Segment Reporting Information [Line Items]          
Revenues 10 [1] 3 [2] 15 [1] 10 [1]  
Net change in fair value of insured derivatives 0 0 0 0  
Net gains (losses) on financial instruments at fair value and foreign exchange 37 11 39 19  
Net investment losses related to other-than-temporary impairments 0 (4) 0 (4)  
Net gains (losses) on extinguishment of debt 0 0 0 0  
Other net realized gains (losses) 0 1 0 6  
Revenues of consolidated VIEs (1) 0 (10) 0  
Inter-segment revenues 35 [3] 53 [3] 56 [3] 132 [3]  
Total revenues 81 64 100 163  
Losses and loss adjustment 0 0 0 0  
Operating 29 24 125 69  
Interest 13 14 36 43  
Expenses of consolidated VIEs 0 0 0 0  
Inter-segment expenses 3 [3] 4 [3] 8 [3] 10 [3]  
Total expenses 45 42 169 122  
Income (loss) before income taxes 36 22 (69) 41  
Identifiable assets 910 843 910 843  
Operating Segments [Member] | Wind Down Operations [Member]
          
Segment Reporting Information [Line Items]          
Revenues 6 [1],[4] 9 [2],[4] 21 [1],[4] 44 [1],[4]  
Net change in fair value of insured derivatives 0 0 0 0  
Net gains (losses) on financial instruments at fair value and foreign exchange (29) (40) (38) (160)  
Net investment losses related to other-than-temporary impairments 0 0 0 (56)  
Net gains (losses) on extinguishment of debt 7 0 11 0  
Other net realized gains (losses) 0 0 0 0  
Revenues of consolidated VIEs 1 20 8 60  
Inter-segment revenues (3) [3],[5] (1) [3],[5] (5) [3],[5] (19) [3],[5]  
Total revenues (18) (12) (3) (131)  
Losses and loss adjustment 0 0 0 0  
Operating 0 1 1 4  
Interest 19 22 59 72  
Expenses of consolidated VIEs 0 3 4 11  
Inter-segment expenses 17 [3],[5] 39 [3],[5] 32 [3],[5] 87 [3],[5]  
Total expenses 36 65 96 174  
Income (loss) before income taxes (54) (77) (99) (305)  
Identifiable assets 1,785 2,861 1,785 2,861  
Intersegment Elimination [Member]
          
Segment Reporting Information [Line Items]          
Revenues 0 [1] 0 [2] 0 [1] 0 [1]  
Net change in fair value of insured derivatives 0 0 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 0 0  
Net gains (losses) on extinguishment of debt (1) 0 38 0  
Other net realized gains (losses) 0 0 0 0  
Revenues of consolidated VIEs 0 0 0 0  
Inter-segment revenues (70) [3] (132) [3] (204) [3] (272) [3]  
Total revenues (71) (132) (166) (272)  
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 (66) [3] (132) [3] (233) [3] (352) [3]  
Total expenses (66) (132) (233) (352)  
Income (loss) before income taxes (5) 0 67 80  
Identifiable assets $ (3,714) [6] $ (6,158) [6] $ (3,714) [6] $ (6,158) [6]  
[1] 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.
[2] Unobservable inputs are either not developed by the Company or do not significantly impact the overall fair values of the aggregate financial assets and liabilities.
[3] Represents intercompany premium income and expense, intercompany asset management fees and expenses, and intercompany interest income and expense pertaining to intercompany receivables and payables.
[4] Represents the sum of third-party interest income, investment management services fees and other fees.
[5] Represents intercompany asset management fees and expenses plus intercompany interest income and expense pertaining to intercompany debt.
[6] Consists of intercompany reinsurance balances, repurchase agreements and loans.