Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 25, 2015
Amortizable intangible assets components [Line Items]
Gross Carrying Amount	$ 661	$ 655
Accumulated Amortization	(557)	(489)
Net Carrying Amount	104	166
Amortization expense associated with intangible assets
Amortization expense	68	73	$ 77
Future amortization expense associated with intangible assets
Fiscal 2018	54
Fiscal 2019	26
Fiscal 2020	16
Fiscal 2021	7
Fiscal 2022	1
Acquisition-related intangible assets
Amortizable intangible assets components [Line Items]
Gross Carrying Amount	193	193
Accumulated Amortization	(167)	(152)
Net Carrying Amount	26	41
Patents and Licensed Technology [Member]
Amortizable intangible assets components [Line Items]
Gross Carrying Amount	468	462
Accumulated Amortization	(390)	(337)
Net Carrying Amount	$ 78	$ 125