Balance Sheet Components (Details) - USD ($) $ in Millions		12 Months Ended
		Jan. 29, 2017		Jan. 31, 2016		Jan. 25, 2015	Jan. 26, 2014
Inventories
Raw Materials		$ 252		$ 105
Work in-process		176		103
Finished goods		366		210
Total inventories		794		418
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		1,191		1,100
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		(670)		(634)
Property, Plant and Equipment, Net		521		466
Outstanding Inventory Purchase Obligation		1,000
Depreciation Expenses		118		124		$ 143
Accumulated amortization of LHI and capital lease		164		155
Accrued Liabilities
Deferred revenue	[1]	85		322
Customer related liabilities	[2]	197		160
Accrued payroll and related expenses		137		79
Accrued restructuring and other charges		13	[3]	23	[3]	0
Professional service fees		13		23
Warranty Accrual		8	[4]	11	[4]	$ 8	$ 8
Accrued Royalties, Current		7		1
Capital Lease Obligations, Current		4		4
Coupon interest on Notes		21		3
Taxes payable, short-term		4		2
Charitable contribution payable		4		3
Other		14		11
Total accrued liabilities and other		507		642
Other Long-term Liabilities
Deferred income tax liability	[5]	141		301
Income taxes payable		96		78
Charitable Contribution Payable, Long-term		10		13
Deferred Revenue	[6]	4		44
Other		20		17
Total other long-term liabilities		271		453
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	[7]	218		218
Building
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 13		13
Property, Plant and Equipment, Estimated Useful Lives		25-30
Test equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 427		354
Property, Plant and Equipment, Estimated Useful Lives		3-5
Software and licenses
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 63		98
Property, Plant and Equipment, Estimated Useful Lives		3-5
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	[8]	$ 176		174
Computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 188		155
Property, Plant and Equipment, Estimated Useful Lives		3-5
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross		$ 49		48
Property, Plant and Equipment, Estimated Useful Lives		5
Capital leases
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	[8]	$ 28		28
Construction in process
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	[9]	$ 29		$ 12

[1] Deferred revenue under our patent cross licensing agreement with Intel Corporation will expire in March 2017. We will be recognizing revenue under this agreement through the first quarter of fiscal year 2018.

[2] Customer related liabilities primarily includes accrued rebates and marketing development funds.

[3] Please refer to Note 17 of these Notes to the Consolidated Financial Statements for a discussion regarding restructuring and other charges.

[4] Please refer to Note 10 of these Notes to the Consolidated Financial Statements for a discussion regarding warranties.

[5] Please refer to the “Recently Adopted Accounting Pronouncement” section of Note 1 of these Notes to the Consolidated Financial Statements for a discussion regarding the impact of a recently adopted accounting pronouncement related to stock-based compensation.

[6] Deferred revenue under our patent cross licensing agreement with Intel Corporation is now located in short term deferred revenue as less than twelve months remains on the agreement.

[7] Land is a non-depreciable asset.

[8] Leasehold improvements and capital leases are amortized based on the lesser of either the asset’s estimated useful life or the remaining expected lease term.

[9] Construction in process represents assets that are not in service as of the balance sheet date.