Supplemental Financial Information (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	$ 32	$ 7	$ 82	$ 23
Cost of product revenue [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	55	13	148	42
Other operating expenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	32	7	82	23
All Other Segments [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization Of Purchased Intangible Assets	$ 87	$ 20	$ 230	$ 65