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Business Segments (Summary Of Segments Within Wind-Down Operations) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total revenues | $ 2,435 |  | $ (1,557) |  | $ 894 |
Total expenses | 837 |  | 682 |  | 989 |
Income (loss) before income taxes | 1,598 |  | (2,239) |  | (95) |
Identifiable assets | 21,724 |  | 26,873 |  | 32,279 |
Net gains (losses) on extinguishment of debt | 49 |  | 26 |  | 60 |
Non Variable Interest Entities [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 880 | [1] | 1,038 | [1] | 1,211 | [2]
Net gains (losses) on financial instruments at fair value and foreign exchange | 55 |  | (99) |  | 88 |
Net investment losses related to other-than-temporary impairments | (105) |  | (101) |  | (64) |
Net gains (losses) on extinguishment of debt |  |  | 26 |  | 35 |
Other net realized gains (losses) | 7 |  | (1) |  | 29 |
Operating | 431 |  | 371 |  | 349 |
Interest | 284 |  | 300 |  | 325 |
Variable Interest Entity [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Identifiable assets | 8,300 |  | 10,900 |  |  |
Net gains (losses) on financial instruments at fair value and foreign exchange | 18 |  | 59 |  | 342 |
Net gains (losses) on extinguishment of debt | 49 |  |  |  | 25 |
Other net realized gains (losses) |  |  | 263 |  | (76) |
Revenues of consolidated VIEs | 134 |  | 392 |  | 364 |
Interest | 55 |  | 62 |  | 59 |
Expenses of consolidated VIEs | 72 |  | 91 |  | 83 |
Asset/Liability Products [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Inter-segment revenues | (10) | [3] | (19) | [3] | (13) | [3]
Total revenues | (186) |  | (197) |  | 40 |
Inter-segment expenses | 19 | [3] | 29 | [3] | 58 | [3]
Total expenses | 119 |  | 143 |  | 188 |
Income (loss) before income taxes | (305) |  | (340) |  | (148) |
Identifiable assets | 1,877 |  | 3,752 |  | 5,125 |
Asset/Liability Products [Member] | Non Variable Interest Entities [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 53 | [4] | 90 | [4] | 109 | [4]
Net gains (losses) on financial instruments at fair value and foreign exchange | (176) |  | (276) |  | (76) |
Net investment losses related to other-than-temporary impairments | (56) |  | (31) |  | (59) |
Net gains (losses) on extinguishment of debt | 2 |  | 24 |  | 35 |
Other net realized gains (losses) | 1 |  | 4 |  |  |
Operating | 5 |  | 3 |  | 5 |
Interest | 95 |  | 109 |  | 125 |
Asset/Liability Products [Member] | Variable Interest Entity [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues of consolidated VIEs |  |  | 11 |  | 44 |
Expenses of consolidated VIEs |  |  | 2 |  |  |
Conduits [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Inter-segment revenues | (2) | [3] | (4) | [3] | (4) | [3]
Total revenues | 61 |  | 16 |  | 52 |
Inter-segment expenses | 97 | [3] | 66 | [3] | 3 | [3]
Total expenses | 110 |  | 85 |  | 21 |
Income (loss) before income taxes | (49) |  | (69) |  | 31 |
Identifiable assets | 694 |  | 1,531 |  | 1,565 |
Conduits [Member] | Non Variable Interest Entities [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  |  |  |  | 4 | [4]
Operating |  |  |  |  | (1) |
Conduits [Member] | Variable Interest Entity [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues of consolidated VIEs | 63 |  | 20 |  | 52 |
Expenses of consolidated VIEs | 13 |  | 19 |  | 19 |
Eliminations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Inter-segment revenues | (2) | [3] |  |  | (1) | [3]
Total revenues | (2) |  |  |  | (1) |
Inter-segment expenses |  |  |  |  | (1) | [3]
Total expenses |  |  |  |  | (1) |
Income (loss) before income taxes | (2) |  |  |  |  |
Identifiable assets | (32) |  | (80) |  | (258) |
Wind-Down Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Inter-segment revenues | (14) | [3],[5] | (23) | [3],[6] | (18) | [3],[7]
Total revenues | (127) |  | (181) |  | 91 |
Inter-segment expenses | 116 | [3],[5] | 95 | [3],[8] | 60 | [3],[7]
Total expenses | 229 |  | 228 |  | 208 |
Income (loss) before income taxes | (356) |  | (409) |  | (117) |
Identifiable assets | 2,539 |  | 5,203 |  | 6,432 |
Wind-Down Operations [Member] | Non Variable Interest Entities [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 53 | [1],[4] | 90 | [1],[4] | 113 | [2],[4]
Net gains (losses) on financial instruments at fair value and foreign exchange | (176) |  | (276) |  | (76) |
Net investment losses related to other-than-temporary impairments | (56) |  | (31) |  | (59) |
Net gains (losses) on extinguishment of debt | 2 |  | 24 |  | 35 |
Other net realized gains (losses) | 1 |  | 4 |  |  |
Operating | 5 |  | 3 |  | 4 |
Interest | 95 |  | 109 |  | 125 |
Wind-Down Operations [Member] | Variable Interest Entity [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues of consolidated VIEs | 63 |  | 31 |  | 96 |
Expenses of consolidated VIEs | $ 13 |  | $ 21 |  | $ 19 |
[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 the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements, investment management fees and other fees.
[3] | Represents intercompany asset management fees and expenses plus intercompany interest income and expense pertaining to intercompany debt.
[4] | Represents the sum of third-party interest income, investment management services fees and other fees.
[5] | Represents intercompany premium income and expense, intercompany asset management fees and expenses, intercompany interest income, expenses pertaining to intercompany receivables and payables and intercompany loans.
[6] | Represents intercompany premium income and expense, intercompany asset management fees and expenses, and intercompany interest income and expense pertaining to intercompany receivables and payables.
[7] | Represents intercompany premium income and expense, intercompany asset management fees and expenses, and intercompany interest income and expense pertaining to intercompany receivables and payables.
[8] | Consists of intercompany reinsurance balances, repurchase agreements, deferred taxes, and loans.

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