Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2016	Jan. 25, 2015	Jan. 26, 2014
Amortizable intangible assets components [Line Items]
Gross Carrying Amount	$ 655	$ 638
Accumulated Amortization	(489)	(416)
Net Carrying Amount	166	222
Amortization expense associated with intangible assets
Amortization expense	73	77	$ 73
Future amortization expense associated with intangible assets
Fiscal 2017	67
Fiscal 2018	52
Fiscal 2019	24
Fiscal 2020	16
Fiscal 2021	7
Acquisition-related intangible assets
Amortizable intangible assets components [Line Items]
Gross Carrying Amount	193	189
Accumulated Amortization	(152)	(134)
Net Carrying Amount	$ 41	$ 55
Weighted Average Useful Life	7 years	6 years 9 months 17 days
Patents and Licensed Technology [Member]
Amortizable intangible assets components [Line Items]
Gross Carrying Amount	$ 462	$ 449
Accumulated Amortization	(337)	(282)
Net Carrying Amount	$ 125	$ 167
Weighted Average Useful Life	7 years	7 years 2 months 12 days