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Business Segments (Summary Of Company's Operations) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Variable Interest Entity [Line Items] |  |  |  |  |  |
Unrealized gains (losses) on insured derivatives | $ (441) |  | $ (607) |  | $ 1,650 |
Net gains (losses) on extinguishment of debt | 26 |  | 60 |  | 269 |
Revenues of consolidated VIEs | 392 |  | 364 |  | (19) |
Total revenues | (1,557) |  | 894 |  | 2,954 |
Expenses of consolidated VIEs | 91 |  | 83 |  | 102 |
Total expenses | 682 |  | 989 |  | 1,737 |
Income (loss) before income taxes | (2,239) |  | (95) |  | 1,217 |
Identifiable assets | 26,873 |  | 32,279 |  | 25,701 |
U.S. Public Finance Insurance [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Inter-segment revenues | 79 | [1] | 93 | [1] | 146 | [1]
Total revenues | 745 |  | 750 |  | 808 |
Inter-segment expenses | 114 | [1] | 104 | [1] | 125 | [1]
Total expenses | 170 |  | 220 |  | 257 |
Income (loss) before income taxes | 575 |  | 530 |  | 551 |
Identifiable assets | 7,848 |  | 8,436 |  | 8,184 |
Structured Finance And International Insurance [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues of consolidated VIEs | 361 |  | 246 |  | (58) |
Inter-segment revenues | 91 | [1] | 113 | [1] | 177 | [1]
Total revenues | (2,046) |  | 211 |  | 2,194 |
Expenses of consolidated VIEs | 70 |  | 64 |  | 88 |
Inter-segment expenses | 124 | [1] | 135 | [1] | 116 | [1]
Total expenses | 409 |  | 642 |  | 1,370 |
Income (loss) before income taxes | (2,455) |  | (431) |  | 824 |
Identifiable assets | 19,985 |  | 23,980 |  | 16,447 |
Advisory Services [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Inter-segment revenues | 41 | [1] | 38 | [1] | 22 | [1]
Total revenues | 67 |  | 70 |  | 54 |
Inter-segment expenses | 6 | [1] | 7 | [1] | 1 | [1]
Total expenses | 64 |  | 71 |  | 49 |
Income (loss) before income taxes | 3 |  | (1) |  | 5 |
Identifiable assets | 53 |  | 54 |  | 125 |
Corporate Operations [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Inter-segment revenues | 152 | [1] | 94 | [1] | 19 | [1]
Total revenues | 196 |  | 70 |  | 24 |
Inter-segment expenses | 22 | [1] | 14 | [1] |  |
Total expenses | 172 |  | 168 |  | 93 |
Income (loss) before income taxes | 24 |  | (98) |  | (69) |
Identifiable assets | 829 |  | 653 |  | 1,276 |
Wind-Down Operations [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues | 90 | [2] | 113 | [2] | 193 | [2]
Net gains (losses) on financial instruments at fair value and foreign exchange | (276) |  | (76) |  | 146 |
Net investment losses related to other-than-temporary impairments | (31) |  | (59) |  | (352) |
Net gains (losses) on extinguishment of debt | 24 |  | 35 |  | 203 |
Other net realized gains (losses) | 4 |  | 0 |  | 4 |
Revenues of consolidated VIEs | 31 |  | 96 |  | 39 |
Inter-segment revenues | (23) | [1],[3] | (18) | [1],[3] | (3) | [1],[3]
Total revenues | (181) |  | 91 |  | 230 |
Operating expenses | 3 |  | 4 |  | 27 |
Interest | 109 |  | 125 |  | 169 |
Expenses of consolidated VIEs | 21 |  | 19 |  | 14 |
Inter-segment expenses | 95 | [1],[3] | 60 | [1],[3] | 116 | [1],[3]
Total expenses | 228 |  | 208 |  | 326 |
Income (loss) before income taxes | (409) |  | (117) |  | (96) |
Identifiable assets | 5,203 |  | 6,432 |  | 8,092 |
Eliminations [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues of consolidated VIEs |  |  | 22 |  |  |
Inter-segment revenues | (340) | [1] | (320) | [1] | (361) | [1]
Total revenues | (338) |  | (298) |  | (356) |
Inter-segment expenses | (361) | [1] | (320) | [1] | (358) | [1]
Total expenses | (361) |  | (320) |  | (358) |
Income (loss) before income taxes | 23 |  | 22 |  | 2 |
Identifiable assets | (7,045) | [4] | (7,276) | [4] | (8,423) | [4]
Non Variable Interest Entities [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues | 1,038 | [5] | 1,211 | [5] | 1,460 | [5]
Realized gains (losses) and other settlements on insured derivatives | (2,371) |  | (162) |  | (166) |
Unrealized gains (losses) on insured derivatives | (441) |  | (607) |  | 1,650 |
Net gains (losses) on financial instruments at fair value and foreign exchange | (99) |  | 88 |  | 225 |
Net investment losses related to other-than-temporary impairments | (101) |  | (64) |  | (361) |
Net gains (losses) on extinguishment of debt | 26 |  | 35 |  | 225 |
Other net realized gains (losses) | (1) |  | 29 |  | (60) |
Loss and loss adjustment expense | (80) |  | 232 |  | 864 |
Operating expenses | 371 |  | 349 |  | 397 |
Interest | 300 |  | 325 |  | 374 |
Non Variable Interest Entities [Member] | U.S. Public Finance Insurance [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues | 599 | [5] | 601 | [5] | 638 | [5]
Realized gains (losses) and other settlements on insured derivatives | 2 |  | 1 |  | 1 |
Net gains (losses) on financial instruments at fair value and foreign exchange | 96 |  | 55 |  | 23 |
Other net realized gains (losses) | (31) |  |  |  |  |
Loss and loss adjustment expense | 4 |  | 73 |  | 94 |
Operating expenses | 52 |  | 43 |  | 38 |
Non Variable Interest Entities [Member] | Structured Finance And International Insurance [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues | 319 | [5] | 463 | [5] | 593 | [5]
Realized gains (losses) and other settlements on insured derivatives | (2,373) |  | (163) |  | (167) |
Unrealized gains (losses) on insured derivatives | (441) |  | (607) |  | 1,650 |
Net gains (losses) on financial instruments at fair value and foreign exchange | 58 |  | 135 |  | 59 |
Net investment losses related to other-than-temporary impairments | (62) |  | (5) |  | (9) |
Net gains (losses) on extinguishment of debt |  |  |  |  | 13 |
Other net realized gains (losses) | 1 |  | 29 |  | (64) |
Loss and loss adjustment expense | (84) |  | 159 |  | 770 |
Operating expenses | 166 |  | 149 |  | 260 |
Interest | 133 |  | 135 |  | 136 |
Non Variable Interest Entities [Member] | Advisory Services [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues | 26 | [5] | 30 | [5] | 32 | [5]
Net gains (losses) on financial instruments at fair value and foreign exchange |  |  | 2 |  |  |
Operating expenses | 58 |  | 64 |  | 48 |
Non Variable Interest Entities [Member] | Corporate Operations [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues | 4 | [5] | 4 | [5] | 4 | [5]
Net gains (losses) on financial instruments at fair value and foreign exchange | 23 |  | (28) |  | (3) |
Net investment losses related to other-than-temporary impairments | (8) |  |  |  |  |
Net gains (losses) on extinguishment of debt |  |  |  |  | 4 |
Other net realized gains (losses) | 25 |  |  |  |  |
Operating expenses | 92 |  | 89 |  | 24 |
Interest | 58 |  | 65 |  | 69 |
Non Variable Interest Entities [Member] | Wind-Down Operations [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Revenues | 90 | [5] | 113 | [5] | 193 | [5]
Net gains (losses) on financial instruments at fair value and foreign exchange | (276) |  | (76) |  | 146 |
Net investment losses related to other-than-temporary impairments | (31) |  | (59) |  | (352) |
Net gains (losses) on extinguishment of debt | 24 |  | 35 |  | 203 |
Other net realized gains (losses) | 4 |  |  |  | 4 |
Operating expenses | 3 |  | 4 |  | 27 |
Interest | 109 |  | 125 |  | 169 |
Non Variable Interest Entities [Member] | Eliminations [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Net gains (losses) on extinguishment of debt | 2 |  |  |  | 5 |
Variable Interest Entities [Member] |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 59 |  | 342 |  | (4) |
Net investment losses related to other-than-temporary impairments |  |  |  |  | (106) |
Net gains (losses) on extinguishment of debt |  |  | 25 |  | 44 |
Other net realized gains (losses) | 263 |  | (76) |  | (41) |
Interest | 62 |  | 59 |  | 101 |
Identifiable assets | $ 10,900 |  | $ 14,100 |  |  |
[1] | Represents intercompany premium income and expense, intercompany asset management fees and expenses, and intercompany interest income and expense pertaining to intercompany receivable and payables.
[2] | Represents the sum of third-party interest income, investment management services fees and other fees.
[3] | Represents intercompany asset management fees and expenses plus intercompany interest income and expense pertaining to intercompany debt.
[4] | Consists of intercompany reinsurance balances, repurchase agreements and loans.
[5] | Represents the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements, investment fees and other fees.

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