Stock Based Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Apr. 30, 2017	Jan. 29, 2017	May 01, 2016
Share-based Compensation
Cost of revenue		$ 4		$ 4
Research and development		41		29
Sales, general and administrative		31		20
Stock-based compensation expense		$ 76		53
Stock Options
Stock options beginning balance (in shares)		7.0
Stock Options granted (in shares)		0.0
Stock options exercised (in shares)		(1.0)
Stock options canceled (in shares)		0.0
Stock options ending balance (in shares)		6.0	7.0
Weighted average exercise price of stock options at beginning of period		$ 14.47
Weighted average exercise price of stock options granted		0
Weighted average exercise price of stock options exercised		14.73
Weighted average exercise price of stock options canceled		0
Weighted average exercise price of stock options at end of period		$ 14.43	$ 14.47
RSUs, PSUs, and Market-based PSUs
RSUs, PSUs and mkt-based PSUs beginning balance (in shares)		27.0
RSUs, PSUs and mkt-based PSUs granted (in shares)	[1],[2]	2.0
RSUs, PSUs and mkt-based PSUs vested (in shares)		(5.0)
RSUs, PSUs and mkt-based PSUs canceled (in shares)		0.0
RSUs, PSUs, and mkt-based PSUs ending balance (in shares)		24.0	27.0
Weighted average grant date fair value of RSUs, PSUs and mkt-based PSUs at beginning of period		$ 32.84
Weighted avg grant-date FV of RSUs, PSUs and mkt-based PSUs		99.23
Weighted average grant-date fair value of RSUs, PSUs and mkt-based PSUs vested		20.82
Weighted average grant date fair value of RSUs, PSUs and mkt-based PSUs canceled		0.00
Weighted avg grant date FV of RSUs, PSUs and mkt-based PSUs at end of period		$ 40.90	$ 32.84
Maximum number of PSUs issuable		0.6
Maximum number of market-based PSUs issuable		0.1
Stock-based compensation expense related to equity awards not expected to vest		$ 27		$ 10
Summary of unearned SBC expense
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures		$ 708	$ 627
Employee Stock Option
Summary of unearned SBC expense
Estimated weighted average amortization period		4 months 24 days	6 months
RSUs, PSUs, and Market-based PSUs
Summary of unearned SBC expense
Estimated weighted average amortization period		2 years 7 months 6 days	2 years 7 months 6 days
Employee Stock Purchase Plan
Summary of unearned SBC expense
Estimated weighted average amortization period		7 months 5 days	7 months 5 days

[1] Includes PSUs that will be issued and eligible to vest if the corporate financial performance maximum target level for fiscal year 2018 is achieved. Depending on the actual level of achievement of the corporate performance target at the end of fiscal year 2018, the PSUs issued could be up to 0.6 million shares.

[2] Includes market-based PSUs that will be issued and eligible to vest if the maximum target for total shareholder return, or TSR, over the 3-year measurement period is achieved. Depending on the ranking of our TSR compared to the respective TSRs of the companies comprising the Standard & Poor’s 500 Index during a 3-year measurement period, the market-based PSUs issued could be up to 0.1 million shares.