Goodwill and Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Acquired patents	$ 684		$ 684		$ 51
Accumulated amortization	(76)		(76)		(32)
Net acquired intangible assets	833		833		80
Goodwill	590		590		82
Goodwill and other intangible assets	1,423		1,423		162
Amortization expense	31	5	44	15
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
The remainder of 2012	34		34
2013	126		126
2014	120		120
2015	112		112
2016	101		101
2017	85		85
Thereafter	255		255
Net acquired intangible assets	833		833		80
Acquired technology
Goodwill and Intangible Assets Disclosure [Line Items]
Other Finite-Lived Intangible Assets, Gross	131		131		38
Tradename and other
Goodwill and Intangible Assets Disclosure [Line Items]
Other Finite-Lived Intangible Assets, Gross	$ 94		$ 94		$ 23
Minimum | Acquired Patents
Goodwill and Intangible Assets Disclosure [Line Items]
Useful lives from date of acquisitions (in years)			3 years
Minimum | Acquired technology
Goodwill and Intangible Assets Disclosure [Line Items]
Useful lives from date of acquisitions (in years)			2 years
Minimum | Tradename and other
Goodwill and Intangible Assets Disclosure [Line Items]
Useful lives from date of acquisitions (in years)			2 years
Maximum | Acquired Patents
Goodwill and Intangible Assets Disclosure [Line Items]
Useful lives from date of acquisitions (in years)			18 years
Maximum | Acquired technology
Goodwill and Intangible Assets Disclosure [Line Items]
Useful lives from date of acquisitions (in years)			10 years
Maximum | Tradename and other
Goodwill and Intangible Assets Disclosure [Line Items]
Useful lives from date of acquisitions (in years)			7 years