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Other Assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
Other assets |  |  |
Restricted cash | $ 584 | $ 4,172 |
Deferred tax assets, net | 2,875 | 3,397 |
Goodwill | 3,172 | 2,639 | 2,328
Prepaid expenses | 2,378 | 1,802 |
Derivative assets | 915 | 1,071 |
Other intangible assets, at amortized cost | 1,149 | 972 |
Other | 1,582 | 1,315 |
Other assets (includes restricted cash of consolidated variable interest entities) | 12,655 | 15,368 |
Prepaid Miles And Reward Points [Member] |  |  |
Other assets |  |  |
Prepaid expenses | $ 1,800 | $ 1,200 |

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