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Income Taxes (Deferred Tax Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Total gross deferred tax assets | $ 1,700 |
Non Variable Interest Entities [Member] |  |
Unearned premium revenue | 174 | 61
Loss and loss adjustment expense reserves | 31 | 493
Deferral of cancellation of indebtedness income | 119 | 119
Deferred acquisition costs | 123 | 144
Investments in VIEs | 154 | 173
Other |  | 216
Total gross deferred tax liabilities | 601 | 1,206
Compensation and employee benefits | 40 | 40
Net operating loss and tax credit carryforwards | 330 | 274
Capital loss carryforwards and other-than- temporary impairments | 236 | 376
Net unrealized losses on insured derivatives | 1,614 | 1,442
Net losses on financial instruments at fair value and foreign exchange | 58 | 41
Net unrealized losses in accumulated other comprehensive income | 105 | 229
Alternative minimum tax credit carryforward | 22 | 45
Net deferred taxes on VIEs | 73 | 43
Other (includes adjustment to deferred taxes for VIEs) | 104 |
Total gross deferred tax assets | 2,582 | 2,490
Valuation allowance | 236 | 376
Net deferred tax asset | $ 1,745 | $ 908

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