Stock Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended
		Apr. 29, 2018	Jan. 28, 2018	Apr. 30, 2017
Share-based Compensation
Cost of revenue		$ 8		$ 4
Research and development		74		41
Sales, general and administrative		47		31
Stock-based compensation expense		$ 129		76
RSUs, PSUs, and Market-based PSUs
RSUs, PSUs and mkt-based PSUs beginning balance (in shares)		22,000
RSUs, PSUs and mkt-based PSUs granted (in shares)	[1],[2]	1,000
RSUs, PSUs and mkt-based PSUs vested (in shares)		(5,000)
RSUs, PSUs, and mkt-based PSUs ending balance (in shares)		18,000	22,000
Weighted average grant date fair value of RSUs, PSUs and mkt-based PSUs at beginning of period		$ 66.72
Weighted avg grant-date FV of RSUs, PSUs and mkt-based PSUs		235.59
Weighted average grant-date fair value of RSUs, PSUs and mkt-based PSUs vested		33.98
Weighted avg grant date FV of RSUs, PSUs and mkt-based PSUs at end of period		$ 81.82	$ 66.72
Maximum number of PSUs issuable		300
Maximum number of market-based PSUs issuable		45
Stock-based compensation expense related to equity awards not expected to vest		$ 18		$ 27
Summary of unearned SBC expense
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures		$ 1,103	$ 1,091
RSUs, PSUs, and Market-based PSUs
Summary of unearned SBC expense
Estimated weighted average amortization period		2 years 4 months 6 days	2 years 3 months 7 days
Employee Stock Purchase Plan
Summary of unearned SBC expense
Estimated weighted average amortization period		1 year 10 days	8 months 6 days

[1] Includes PSUs that will be issued and eligible to vest if the maximum corporate financial performance goal for fiscal year 2019 is achieved. Depending on the actual level of the corporate performance achievement at the end of fiscal year 2019, the PSUs issued could be up to 0.3 million shares.

[2] Includes market-based PSUs that will be issued and eligible to vest if the maximum goal for total shareholder return, or TSR, over the 3-year measurement period is achieved. Depending on the ranking of our TSR compared to those of the companies comprising the Standard & Poor’s 500 Index during that period, the market-based PSUs issued could be up to 45 thousand shares.