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Business Segments (Summary Of Company's Operations) (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Revenues | $ 284 | [1] | $ 265 | [1] | $ 802 | [1] | $ 940 | [1] |
Realized gains and other settlements on insured derivatives | (53) |  | 552 |  | (599) |  | 454 |  |
Unrealized gains (losses) on insured derivatives | 776 |  | (1,044) |  | (531) |  | (1,717) |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 13 |  | 12 |  | (114) |  | (36) |  |
Net investment losses related to other-than-temporary impairments | (11) |  | 0 |  | (44) |  | (43) |  |
Net gains (losses) on extinguishment of debt |  |  | 10 |  | 26 |  | 28 |  |
Other net realized gains (losses) | 1 |  | (1) |  | 6 |  | 18 |  |
Revenues of consolidated VIEs | 110 |  | 15 |  | 64 |  | 386 |  |
Total revenues | 1,120 |  | (191) |  | (390) |  | 30 |  |
Loss and loss adjustment expense | 190 |  | (20) |  | 204 |  | 122 |  |
Operating expenses | 88 |  | 84 |  | 277 |  | 251 |  |
Interest expense | 75 |  | 81 |  | 225 |  | 246 |  |
Expenses of consolidated VIEs | 22 |  | 20 |  | 69 |  | 58 |  |
Total expenses | 375 |  | 165 |  | 775 |  | 677 |  |
Income (loss) before income taxes | 745 |  | (356) |  | (1,165) |  | (647) |  |
Identifiable assets | 29,370 |  | 33,272 |  | 29,370 |  | 33,272 |  | 32,279
Non Variable Interest Entities [Member] |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Realized gains and other settlements on insured derivatives | (53) |  | 552 |  | (599) |  | 454 |  |
Unrealized gains (losses) on insured derivatives | 776 |  | (1,044) |  | (531) |  | (1,717) |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 13 |  | 12 |  | (114) |  | (36) |  |
Net investment losses related to other-than-temporary impairments | (11) |  |  |  | (44) |  | (43) |  |
Net gains (losses) on extinguishment of debt |  |  | 10 |  | 26 |  | 28 |  |
Other net realized gains (losses) | 1 |  | (1) |  | 6 |  | 18 |  |
Loss and loss adjustment expense | 190 |  | (20) |  | 204 |  | 122 |  |
Interest expense | 75 |  | 81 |  | 225 |  | 246 |  |
U.S. Public Finance Insurance [Member] |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 181 | [1] | 143 | [1] | 455 | [1] | 459 | [1] |
Realized gains and other settlements on insured derivatives |  |  | 0 |  | 2 |  | 0 |  |
Unrealized gains (losses) on insured derivatives |  |  | 0 |  |  |  | 0 |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 6 |  | 45 |  | 24 |  | 49 |  |
Other net realized gains (losses) |  |  |  |  |  |  | 0 |  |
Inter-segment revenues | 21 | [2] | 18 | [2] | 56 | [2] | 66 | [2] |
Total revenues | 208 |  | 206 |  | 537 |  | 574 |  |
Loss and loss adjustment expense | 10 |  | 6 |  | 4 |  | 42 |  |
Operating expenses | 10 |  | 11 |  | 36 |  | 31 |  |
Inter-segment expenses | 31 | [2] | 22 | [2] | 84 | [2] | 74 | [2] |
Total expenses | 51 |  | 39 |  | 124 |  | 147 |  |
Income (loss) before income taxes | 157 |  | 167 |  | 413 |  | 427 |  |
Identifiable assets | 8,015 |  | 8,616 |  | 8,015 |  | 8,616 |  |
Structured Finance And International Insurance [Member] |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 72 | [1] | 89 | [1] | 253 | [1] | 370 | [1] |
Realized gains and other settlements on insured derivatives | (53) |  | 552 |  | (601) |  | 454 |  |
Unrealized gains (losses) on insured derivatives | 776 |  | (1,044) |  | (531) |  | (1,717) |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (12) |  | 145 |  | 21 |  | 131 |  |
Net investment losses related to other-than-temporary impairments |  |  | 0 |  | (4) |  | (4) |  |
Other net realized gains (losses) | 1 |  | (1) |  | 2 |  | 18 |  |
Revenues of consolidated VIEs | 105 |  | (19) |  | 39 |  | 310 |  |
Inter-segment revenues | 25 | [2] | 19 | [2] | 55 | [2] | 69 | [2] |
Total revenues | 914 |  | (259) |  | (766) |  | (369) |  |
Loss and loss adjustment expense | 180 |  | (26) |  | 200 |  | 80 |  |
Operating expenses | 38 |  | 31 |  | 124 |  | 102 |  |
Interest expense | 33 |  | 34 |  | 99 |  | 102 |  |
Expenses of consolidated VIEs | 17 |  | 15 |  | 54 |  | 46 |  |
Inter-segment expenses | 33 | [2] | 28 | [2] | 91 | [2] | 103 | [2] |
Total expenses | 301 |  | 82 |  | 568 |  | 433 |  |
Income (loss) before income taxes | 613 |  | (341) |  | (1,334) |  | (802) |  |
Identifiable assets | 21,251 |  | 24,321 |  | 21,251 |  | 24,321 |  |
Advisory Services [Member] |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 9 | [1] | 7 | [1] | 22 | [1] | 21 | [1] |
Net gains (losses) on financial instruments at fair value and foreign exchange |  |  | 1 |  |  |  | 2 |  |
Other net realized gains (losses) |  |  |  |  |  |  | 0 |  |
Inter-segment revenues | 5 | [2] | 10 | [2] | 24 | [2] | 29 | [2] |
Total revenues | 14 |  | 18 |  | 46 |  | 52 |  |
Operating expenses | 14 |  | 17 |  | 48 |  | 45 |  |
Inter-segment expenses | 1 | [2] | 2 | [2] | 4 | [2] | 5 | [2] |
Total expenses | 15 |  | 19 |  | 52 |  | 50 |  |
Income (loss) before income taxes | (1) |  | (1) |  | (6) |  | 2 |  |
Identifiable assets | 53 |  | 51 |  | 53 |  | 51 |  |
Corporate Operations [Member] |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 1 | [1] | 1 | [1] | 2 | [1] | 3 | [1] |
Net gains (losses) on financial instruments at fair value and foreign exchange | 8 |  | (62) |  | 47 |  | (80) |  |
Net investment losses related to other-than-temporary impairments | (10) |  |  |  | (10) |  |  |  |
Net gains (losses) on extinguishment of debt |  |  | 0 |  |  |  | 0 |  |
Other net realized gains (losses) |  |  |  |  |  |  | 0 |  |
Inter-segment revenues | 22 | [2] | 24 | [2] | 66 | [2] | 74 | [2] |
Total revenues | 21 |  | (37) |  | 105 |  | (3) |  |
Operating expenses | 24 |  | 23 |  | 67 |  | 69 |  |
Interest expense | 14 |  | 16 |  | 44 |  | 49 |  |
Inter-segment expenses | 4 | [2] | 4 | [2] | 11 | [2] | 10 | [2] |
Total expenses | 42 |  | 43 |  | 122 |  | 128 |  |
Income (loss) before income taxes | (21) |  | (80) |  | (17) |  | (131) |  |
Identifiable assets | 652 |  | 1,308 |  | 652 |  | 1,308 |  |
Wind-Down Operations [Member] |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 21 | [1],[3] | 25 | [1],[3] | 70 | [1],[3] | 87 | [1],[3] |
Net gains (losses) on financial instruments at fair value and foreign exchange | 11 |  | (117) |  | (206) |  | (138) |  |
Net investment losses related to other-than-temporary impairments | (1) |  | 0 |  | (30) |  | (39) |  |
Net gains (losses) on extinguishment of debt |  |  | 10 |  | 24 |  | 28 |  |
Other net realized gains (losses) |  |  |  |  | 4 |  | 0 |  |
Revenues of consolidated VIEs | 5 |  | 34 |  | 25 |  | 76 |  |
Inter-segment revenues | (4) | [2],[4] | (5) | [2],[4] | (12) | [2],[4] | (15) | [2],[4] |
Total revenues | 32 |  | (53) |  | (125) |  | (1) |  |
Operating expenses | 2 |  | 2 |  | 2 |  | 4 |  |
Interest expense | 28 |  | 31 |  | 82 |  | 95 |  |
Expenses of consolidated VIEs | 5 |  | 5 |  | 15 |  | 12 |  |
Inter-segment expenses | 6 | [2],[4] | 13 | [2],[4] | 24 | [2],[4] | 47 | [2],[4] |
Total expenses | 41 |  | 51 |  | 123 |  | 158 |  |
Income (loss) before income taxes | (9) |  | (104) |  | (248) |  | (159) |  |
Identifiable assets | 5,556 |  | 7,008 |  | 5,556 |  | 7,008 |  |
Eliminations [Member] |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Net gains (losses) on extinguishment of debt |  |  |  |  | 2 |  |  |  |
Inter-segment revenues | (69) | [2] | (66) | [2] | (189) | [2] | (223) | [2] |
Total revenues | (69) |  | (66) |  | (187) |  | (223) |  |
Inter-segment expenses | (75) | [2] | (69) | [2] | (214) | [2] | (239) | [2] |
Total expenses | (75) |  | (69) |  | (214) |  | (239) |  |
Income (loss) before income taxes | 6 |  | 3 |  | 27 |  | 16 |  |
Identifiable assets | $ (6,157) | [5] | $ (8,032) | [5] | $ (6,157) | [5] | $ (8,032) | [5] |
[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] |
[4] | Represents intercompany asset management fees and expenses plus intercompany interest income and expense.
[5] | Consists of intercompany reinsurance balances, repurchase agreements and loans.

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