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Other Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Other Assets Details [Abstract] |  |  |
Goodwill | $ 3,181 | $ 3,172 | $ 2,639
Deferred tax assets, net | 2,458 | 2,875 |
Prepaid expenses | 1,960 | 2,378 |
Other intangible assets, at amortized cost | 993 | 1,149 |
Derivative assets | 593 | 915 |
Restricted cash | 568 | 584 |
Other | 1,665 | 1,582 |
Other assets (includes restricted cash of consolidated variable interest entities) | $ 11,418 | $ 12,655 |

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