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Business Segments (Summary Of Company's Segment Results) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 142 | [1] | $ 164 | [1] |
Net change in fair value of insured derivatives | 469 |  | (61) |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (55) |  | 63 |  |
Net investment losses related to other-than-temporary impairments | 0 |  | 0 |  |
Net gains (losses) on extinguishment of debt | 1 |  | 4 |  |
Other net realized gains (losses) | 1 |  | 0 |  |
Revenues of consolidated VIEs | 19 |  | 49 |  |
Inter-segment revenues | 0 | [2] | 0 | [2] |
Total revenues | 577 |  | 219 |  |
Losses and loss adjustment | 50 |  | (194) |  |
Operating | 56 |  | 122 |  |
Interest | 54 |  | 60 |  |
Expenses of consolidated VIEs | 13 |  | 16 |  |
Inter-segment expenses | 0 | [2] | 0 | [2] |
Total expenses | 173 |  | 4 |  |
Income (loss) before income taxes | 404 |  | 215 |  |
Identifiable assets | 16,087 |  | 21,592 |  | 16,953
Reportable Subsegments [Member] | Asset Liability Products Business [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 9 | [3] | 9 | [3] |
Net gains (losses) on financial instruments at fair value and foreign exchange | (38) |  | 3 |  |
Net investment losses related to other-than-temporary impairments | 0 |  | 0 |  |
Net gains (losses) on extinguishment of debt | 1 |  | 4 |  |
Other net realized gains (losses) | 0 |  | 0 |  |
Revenues of consolidated VIEs | 0 |  | 0 |  |
Inter-segment revenues | (2) | [4] | (2) | [4] |
Total revenues | (30) |  | 14 |  |
Operating | 0 |  | 0 |  |
Interest | 18 |  | 20 |  |
Expenses of consolidated VIEs | 0 |  | 0 |  |
Inter-segment expenses | 2 | [4] | 2 | [4] |
Total expenses | 20 |  | 22 |  |
Income (loss) before income taxes | (50) |  | (8) |  |
Identifiable assets | 1,471 |  | 1,822 |  |
Reportable Subsegments [Member] | Conduits [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0 | [3] | 0 | [3] |
Net gains (losses) on financial instruments at fair value and foreign exchange | 0 |  | 0 |  |
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) | 0 |  | 0 |  |
Revenues of consolidated VIEs | 4 |  | 2 |  |
Inter-segment revenues | (1) | [4] | 0 | [4] |
Total revenues | 3 |  | 2 |  |
Operating | 0 |  | 0 |  |
Interest | 0 |  | 0 |  |
Expenses of consolidated VIEs | 0 |  | 2 |  |
Inter-segment expenses | 0 | [4] | 11 | [4] |
Total expenses | 0 |  | 13 |  |
Income (loss) before income taxes | 3 |  | (11) |  |
Identifiable assets | 75 |  | 692 |  |
Intersubsegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0 | [3] | 0 | [3] |
Net gains (losses) on financial instruments at fair value and foreign exchange | 0 |  | 0 |  |
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) | 0 |  | 0 |  |
Revenues of consolidated VIEs | 0 |  | 0 |  |
Inter-segment revenues | 0 | [4] | 0 | [4] |
Total revenues | 0 |  | 0 |  |
Operating | 0 |  | 0 |  |
Interest | 0 |  | 0 |  |
Expenses of consolidated VIEs | 0 |  | 0 |  |
Inter-segment expenses | 0 | [4] | 0 | [4] |
Total expenses | 0 |  | 0 |  |
Income (loss) before income taxes | 0 |  | 0 |  |
Identifiable assets | 2 |  | (30) |  |
U S Public Finance Insurance [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Losses and loss adjustment | (14) |  |  |  |
Operating Segments [Member] | U S Public Finance Insurance [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 88 | [1] | 108 | [1] |
Net change in fair value of insured derivatives | 1 |  | 0 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 4 |  | 32 |  |
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) | 0 |  | 0 |  |
Revenues of consolidated VIEs | 0 |  | 0 |  |
Inter-segment revenues | 12 | [2] | 46 | [2] |
Total revenues | 105 |  | 186 |  |
Losses and loss adjustment | (14) |  | 4 |  |
Operating | 9 |  | 14 |  |
Interest | 0 |  | 0 |  |
Expenses of consolidated VIEs | 0 |  | 0 |  |
Inter-segment expenses | 18 | [2] | 26 | [2] |
Total expenses | 13 |  | 44 |  |
Income (loss) before income taxes | 92 |  | 142 |  |
Identifiable assets | 6,124 |  | 6,874 |  |
Operating Segments [Member] | Structured Finance And International Insurance [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 34 | [1] | 42 | [1] |
Net change in fair value of insured derivatives | 468 |  | (61) |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (3) |  | 22 |  |
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) | 0 |  | 0 |  |
Revenues of consolidated VIEs | 20 |  | 47 |  |
Inter-segment revenues | 12 | [2] | 20 | [2] |
Total revenues | 531 |  | 70 |  |
Losses and loss adjustment | 64 |  | (198) |  |
Operating | 16 |  | 34 |  |
Interest | 27 |  | 28 |  |
Expenses of consolidated VIEs | 13 |  | 14 |  |
Inter-segment expenses | 19 | [2] | 56 | [2] |
Total expenses | 139 |  | (66) |  |
Income (loss) before income taxes | 392 |  | 136 |  |
Identifiable assets | 10,875 |  | 17,149 |  |
Operating Segments [Member] | Advisory Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 3 | [1] | 4 | [1] |
Net change in fair value of insured derivatives | 0 |  | 0 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (4) |  | 0 |  |
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) | 0 |  | 0 |  |
Revenues of consolidated VIEs | 0 |  | 0 |  |
Inter-segment revenues | 6 | [2] | 7 | [2] |
Total revenues | 5 |  | 11 |  |
Losses and loss adjustment | 0 |  | 0 |  |
Operating | 11 |  | 10 |  |
Interest | 0 |  | 0 |  |
Expenses of consolidated VIEs | 0 |  | 0 |  |
Inter-segment expenses | 1 | [2] | 2 | [2] |
Total expenses | 12 |  | 12 |  |
Income (loss) before income taxes | (7) |  | (1) |  |
Identifiable assets | 34 |  | 34 |  |
Operating Segments [Member] | Corporate Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 8 | [1] | 1 | [1] |
Net change in fair value of insured derivatives | 0 |  | 0 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (14) |  | 6 |  |
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 |  | 0 |  |
Revenues of consolidated VIEs | (5) |  | 0 |  |
Inter-segment revenues | 16 | [2] | 26 | [2] |
Total revenues | 6 |  | 33 |  |
Losses and loss adjustment | 0 |  | 0 |  |
Operating | 20 |  | 64 |  |
Interest | 9 |  | 12 |  |
Expenses of consolidated VIEs | 0 |  | 0 |  |
Inter-segment expenses | 5 | [2] | 3 | [2] |
Total expenses | 34 |  | 79 |  |
Income (loss) before income taxes | (28) |  | (46) |  |
Identifiable assets | 1,233 |  | 861 |  |
Operating Segments [Member] | Wind Down Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 9 | [1],[3] | 9 | [1],[3] |
Net change in fair value of insured derivatives | 0 |  | 0 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (38) |  | 3 |  |
Net investment losses related to other-than-temporary impairments | 0 |  | 0 |  |
Net gains (losses) on extinguishment of debt | 1 |  | 4 |  |
Other net realized gains (losses) | 0 |  | 0 |  |
Revenues of consolidated VIEs | 4 |  | 2 |  |
Inter-segment revenues | (3) | [2],[4] | (2) | [2],[4] |
Total revenues | (27) |  | 16 |  |
Losses and loss adjustment | 0 |  | 0 |  |
Operating | 0 |  | 0 |  |
Interest | 18 |  | 20 |  |
Expenses of consolidated VIEs | 0 |  | 2 |  |
Inter-segment expenses | 2 | [2],[4] | 13 | [2],[4] |
Total expenses | 20 |  | 35 |  |
Income (loss) before income taxes | (47) |  | (19) |  |
Identifiable assets | 1,548 |  | 2,484 |  |
Intersegment Elimination [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 0 | [1] | 0 | [1] |
Net change in fair value of insured derivatives | 0 |  | 0 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 0 |  | 0 |  |
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) | 0 |  | 0 |  |
Revenues of consolidated VIEs | 0 |  | 0 |  |
Inter-segment revenues | (43) | [2] | (97) | [2] |
Total revenues | (43) |  | (97) |  |
Losses and loss adjustment | 0 |  | 0 |  |
Operating | 0 |  | 0 |  |
Interest | 0 |  | 0 |  |
Expenses of consolidated VIEs | 0 |  | 0 |  |
Inter-segment expenses | (45) | [2] | (100) | [2] |
Total expenses | (45) |  | (100) |  |
Income (loss) before income taxes | 2 |  | 3 |  |
Identifiable assets | $ (3,727) | [5] | $ (5,810) | [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] | Represents intercompany premium income and expense, intercompany asset management fees and expenses, and intercompany interest income and expense pertaining to intercompany receivables and payables.
[3] | Represents the sum of third-party interest income, investment management services fees and other fees.
[4] | Represents intercompany asset management fees and expenses plus intercompany interest income and expense pertaining to intercompany debt.
[5] | Consists of intercompany reinsurance balances, repurchase agreements and deferred income taxes.
[6] | Consists of intercompany reinsurance balances, repurchase agreements and loans.

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