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Business Segments (Summary Of Segments Within Wind-Down Operations) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | $ 168 | [1] | $ 251 | [1] | $ 332 | [1] | $ 458 | [1] |
Net gains (losses) on financial instruments at fair value and foreign exchange | (6) |  | (6) |  | 57 |  | (25) |  |
Net investment losses related to other-than-temporary impairments | 0 |  | (3) |  | 0 |  | (97) |  |
Net gains (losses) on extinguishment of debt | 39 |  | 0 |  | 43 |  | 0 |  |
Other net realized gains (losses) | 0 |  | 6 |  | 0 |  | 6 |  |
Revenues of consolidated VIEs | 93 |  | 16 |  | 142 |  | 6 |  |
Inter-segment revenues | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] |
Total revenues | 112 |  | 1,039 |  | 331 |  | 1,422 |  |
Operating | 114 |  | 93 |  | 236 |  | 263 |  |
Interest | 60 |  | 71 |  | 120 |  | 145 |  |
Expenses of consolidated VIEs | 14 |  | 18 |  | 30 |  | 39 |  |
Inter-segment expenses | 0 | [2] | 0 | [2] | 0 | [2] | 0 | [2] |
Total expenses | 376 |  | 244 |  | 380 |  | 606 |  |
Income (loss) before income taxes | (264) |  | 795 |  | (49) |  | 816 |  |
Identifiable assets | 18,122 |  | 22,295 |  | 18,122 |  | 22,295 |  | 21,724
Non Variable Interest Entity [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | (6) |  | (6) |  | 57 |  | (25) |  |
Net investment losses related to other-than-temporary impairments | 0 |  | (3) |  | 0 |  | (97) |  |
Net gains (losses) on extinguishment of debt | 39 |  | 0 |  | 43 |  | 0 |  |
Other net realized gains (losses) | 0 |  | 6 |  | 0 |  | 6 |  |
Interest | 60 |  | 71 |  | 120 |  | 145 |  |
Variable Interest Entity Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 78 |  | (34) |  | 111 |  | (61) |  |
Net gains (losses) on extinguishment of debt | 0 |  | 33 |  | 0 |  | 33 |  |
Other net realized gains (losses) | 1 |  | 0 |  | 1 |  | 0 |  |
Interest | 12 |  | 15 |  | 24 |  | 30 |  |
Asset Liability Products Business [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 6 | [3] | 16 | [3] | 15 | [3] | 35 | [3] |
Net gains (losses) on financial instruments at fair value and foreign exchange | (12) |  | (40) |  | (9) |  | (120) |  |
Net investment losses related to other-than-temporary impairments | 0 |  | (2) |  | 0 |  | (56) |  |
Net gains (losses) on extinguishment of debt | 0 |  | 0 |  | 4 |  | 0 |  |
Other net realized gains (losses) | 0 |  | 0 |  | 0 |  | 0 |  |
Revenues of consolidated VIEs | 0 |  | 0 |  | 0 |  | 0 |  |
Inter-segment revenues | 0 | [4] | (18) | [4] | (2) | [4] | (15) | [4] |
Total revenues | (6) |  | (44) |  | 8 |  | (156) |  |
Operating | 1 |  | 3 |  | 1 |  | 3 |  |
Interest | 20 |  | 23 |  | 40 |  | 50 |  |
Expenses of consolidated VIEs | 0 |  | 0 |  | 0 |  | 0 |  |
Inter-segment expenses | 2 | [4] | 6 | [4] | 4 | [4] | 12 | [4] |
Total expenses | 23 |  | 32 |  | 45 |  | 65 |  |
Income (loss) before income taxes | (29) |  | (76) |  | (37) |  | (221) |  |
Identifiable assets | 1,638 |  | 2,439 |  | 1,638 |  | 2,439 |  |
Conduits [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 0 | [3] | 0 | [3] | 0 | [3] | 0 | [3] |
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 | 5 |  | 36 |  | 7 |  | 40 |  |
Inter-segment revenues | (7) | [4] | (1) | [4] | (7) | [4] | (2) | [4] |
Total revenues | (2) |  | 35 |  | 0 |  | 38 |  |
Operating | 0 |  | 0 |  | 0 |  | 0 |  |
Interest | 0 |  | 0 |  | 0 |  | 0 |  |
Expenses of consolidated VIEs | 2 |  | 4 |  | 4 |  | 8 |  |
Inter-segment expenses | 0 | [4] | 34 | [4] | 11 | [4] | 35 | [4] |
Total expenses | 2 |  | 38 |  | 15 |  | 43 |  |
Income (loss) before income taxes | (4) |  | (3) |  | (15) |  | (5) |  |
Identifiable assets | 359 |  | 819 |  | 359 |  | 819 |  |
Wind Down Eliminations [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 0 | [3] | 0 | [3] | 0 | [3] | 0 | [3] |
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 |  |
Other net realized gains (losses) | 0 |  | 0 |  | 0 |  | 0 |  |
Revenues of consolidated VIEs | 0 |  | 0 |  | 0 |  | 0 |  |
Inter-segment revenues | 7 | [4] | (2) | [4] | 7 | [4] | (2) | [4] |
Total revenues | 7 |  | (2) |  | 7 |  | (2) |  |
Operating |  |  | 0 |  | 0 |  | 0 |  |
Interest | 0 |  | 0 |  | 0 |  | 0 |  |
Expenses of consolidated VIEs | 0 |  | 0 |  | 0 |  | 0 |  |
Inter-segment expenses | 0 | [4] | 0 | [4] | 0 | [4] | 0 | [4] |
Total expenses | 0 |  | 0 |  | 0 |  | 0 |  |
Income (loss) before income taxes | 7 |  | (2) |  | 7 |  | (2) |  |
Identifiable assets | 12 |  | (53) |  | 12 |  | (53) |  |
Wind Down Eliminations [Member] | Non Variable Interest Entity [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Net gains (losses) on extinguishment of debt | 0 |  |  |  |  |  |  |  |
Operating | 0 |  |  |  |  |  |  |  |
Wind Down Operations [Member] |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Revenues | 6 | [1],[3] | 16 | [1] | 15 | [1],[3] | 35 | [1],[3] |
Net gains (losses) on financial instruments at fair value and foreign exchange | (12) |  | (40) |  | (9) |  | (120) |  |
Net investment losses related to other-than-temporary impairments | 0 |  | (2) |  | 0 |  | (56) |  |
Net gains (losses) on extinguishment of debt | 0 |  | 0 |  | 4 |  | 0 |  |
Other net realized gains (losses) | 0 |  | 0 |  | 0 |  | 0 |  |
Revenues of consolidated VIEs | 5 |  | 36 |  | 7 |  | 40 |  |
Inter-segment revenues | 0 | [2],[4] | (21) | [2],[4] | (2) | [2],[4] | (19) | [2],[4] |
Total revenues | (1) |  | (11) |  | 15 |  | (120) |  |
Operating | 1 |  | 3 |  | 1 |  | 3 |  |
Interest | 20 |  | 23 |  | 40 |  | 50 |  |
Expenses of consolidated VIEs | 2 |  | 4 |  | 4 |  | 8 |  |
Inter-segment expenses | 2 | [2],[4] | 40 | [2],[4] | 15 | [2],[4] | 47 | [2],[4] |
Total expenses | 25 |  | 70 |  | 60 |  | 108 |  |
Income (loss) before income taxes | (26) |  | (81) |  | (45) |  | (228) |  |
Identifiable assets | $ 2,009 |  | $ 3,205 |  | $ 2,009 |  | $ 3,205 |  |
[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.

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