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Summary of Estimated Fair Value and Useful Lives of Intangible Assets (Detail) (OptionsXpress Holdings, Inc., USD $)
In Millions, unless otherwise specified |
1 Months Ended |
|---|---|
|
Sep. 01, 2011
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|
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Estimated Fair Value | $ 285 |
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Customer Relationships
|
|
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Estimated Fair Value | 200 |
| Estimated Useful Life (In Years) | 11 years |
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Technology
|
|
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Estimated Fair Value | 70 |
| Estimated Useful Life (In Years) | 9 years |
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Trade Name
|
|
| Acquired Finite-Lived Intangible Assets [Line Items] | |
| Estimated Fair Value | $ 15 |
| Estimated Useful Life (In Years) | 9 years |