Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense	$ 8	$ 5	$ 13	$ 10
Business acquisitions total consideration	24		24
Patents
Goodwill and Intangible Assets Disclosure [Line Items]
Purchased patents for cash	633		633
Patents | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated remaining useful lives of intangible assets acquired			3 years
Patents | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated remaining useful lives of intangible assets acquired			18 years
Patents | Microsoft Corporation
Goodwill and Intangible Assets Disclosure [Line Items]
Cash payment for patents acquired			550
Deferred tax liability	$ 49		$ 49
Patents | Microsoft Corporation | U S
Goodwill and Intangible Assets Disclosure [Line Items]
Number of patents acquired			615
Patents | Microsoft Corporation | Foreign Tax Authority
Goodwill and Intangible Assets Disclosure [Line Items]
Number of patents acquired			170
Patents | Current Period Acquisition | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated remaining useful lives of intangible assets acquired			3 years
Patents | Current Period Acquisition | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated remaining useful lives of intangible assets acquired			17 years
Non-compete agreements
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated remaining useful lives of intangible assets acquired			2 years
Average useful lives of intangible assets acquired			2 years
Acquired Technology and Other
Goodwill and Intangible Assets Disclosure [Line Items]
Average useful lives of intangible assets acquired			3 years
Acquired Technology and Other | Minimum
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated remaining useful lives of intangible assets acquired			2 years
Acquired Technology and Other | Maximum
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated remaining useful lives of intangible assets acquired			10 years