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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.

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- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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- Definition Fees and other service revenues recognized in the period that are not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311 + Details
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