XML 60 R62.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Allocation of Purchase Price to Net Assets of optionsXpress (Detail) (OptionsXpress Holdings, Inc., USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Sep. 01, 2011
OptionsXpress Holdings, Inc.
   
Business Acquisition [Line Items]    
Fair value of common stock issued $ 710 $ 710
Fair value of equity awards assumed 4 4
Total consideration paid 714 [1] 714
Fair value of net assets acquired 203 203
Acquisition-related goodwill $ 511 $ 511
[1] Represents a non-cash investing activity.