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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified | Jul. 31, 2011 | Mar. 15, 2011 | Jan. 26, 2011
--- | --- | --- | ---
Commitments And Contingencies |  |  |
Number of causes of actions purported |  |  | 7
Plaintiffs, number of domestic and international financial institutions |  | 19 |
Securities litigation settlement | $ 68 |  |

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