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Commitments and Contingencies, Legal Proceedings (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Year
issuers
day
month
investments
Loss Contingencies [Line Items] 
Number of other issuers included in IPO lawsuit allegations300
Estimated Incremental Tax Liability Excluding Interest And Penalties Related to PNOD$ 92
Estimated incremental tax liability excluding interest and penalties related to NOPA$ 807