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Summary of Preliminary Allocation of Purchase Price to Net Assets of optionsXpress (Detail) (optionsXpress Holdings, Inc., USD $)
In Millions
Sep. 01, 2011
optionsXpress Holdings, Inc.
 
Business Acquisition [Line Items] 
Fair value of common stock issued$ 710
Fair value of equity awards assumed4
Total consideration paid714
Fair value of net assets acquired207
Preliminary goodwill$ 507[1]
[1]Represents a non-cash investing activity.