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Share-based Compensation - Schedule of Share-based Compensation Expense (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Share-based compensation | $ 52 | $ 31 | $ 12 |
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Cost of revenue [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Share-based compensation | 2 | 1 | 1 |
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Research and development [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Share-based compensation | 5 | 2 | |
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Selling, general and administrative [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Share-based compensation | $ 45 | $ 28 | $ 11 |