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Pro Forma Results of Operations (Detail) (OptionsXpress Holdings, Inc., USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
OptionsXpress Holdings, Inc.
Business Acquisition [Line Items]
Net revenues	$ 1,222	$ 3,744
Net income	$ 231	$ 726
Basic EPS	$ 0.18	$ 0.57
Diluted EPS	$ 0.18	$ 0.57

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details