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Summary of Fair Values of Assets Acquired and Liabilities Assumed as of Acquisition Date (Detail) (OptionsXpress Holdings, Inc., USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Sep. 01, 2011
OptionsXpress Holdings, Inc.
    
Assets    
Cash and cash equivalents   $ 84
Cash and investments segregated and on deposit for regulatory purposes   1,074
Receivables from brokers, dealers, and clearing organizations   40
Receivables from brokerage clients   185
Other securities owned - at fair value   32
Intangible assets   285
Other assets   25
Total assets acquired   1,725 [1]
Liabilities    
Payables to brokerage clients   1,221
Deferred tax liability   95
Long-term debt   110 [2]
Accrued expenses and other liabilities   96
Total liabilities assumed   1,522 [1]
Net assets acquired $ 203 $ 203
[1] All assets and liabilities, except for cash and cash equivalents, represent non-cash investing activities.
[2] The Company paid off long-term debt acquired from optionsXpress subsequent to the date of acquisition in September 2011.