Stock-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended			6 Months Ended
		Jul. 29, 2018	Jan. 28, 2018	Jul. 30, 2017	Jul. 29, 2018	Jul. 30, 2017
Share-based Compensation
Stock-based compensation expense		$ 132		$ 81	$ 262	$ 158
Number of Shares
RSUs, PSUs, and Market-based PSUs Outstanding, beginning balance (in shares)					22,000
Granted (in shares)	[1],[2]				1,000
Vested restricted stock (in shares)					(5,000)
Canceled and forfeited (in shares)					0
RSUs, PSUs, and Market-based PSUs Outstanding, ending balance (in shares)		18,000	22,000		18,000
Weighted Average Grant-Date Fair Value Per Share
RSUs, PSUs, and Market-based PSUs, beginning balance (in dollars per share)					$ 66.72
Granted (in dollars per share)					240.22
Vested restricted stock (in dollars per share)					39.64
Canceled and forfeited (in dollars per share)					0.00
RSUs, PSUs, and Market-based PSUs, ending balance (in dollars per share)		$ 84.56	$ 66.72		$ 84.56
Maximum number of PSUs issuable (in shares)		300			300
Maximum number of market-based PSUs issuable (in shares)		45			45
Stock-based compensation expense related to equity awards not expected to vest		$ 12		10	$ 31	39
Summary of unearned SBC expense
Aggregate amount of unearned stock-based compensation expense related to equity awards, adjusted for estimated forfeitures		$ 1,048	$ 1,091		$ 1,048
Market-based PSUs
Weighted Average Grant-Date Fair Value Per Share
Measurement period					3 years
RSUs, PSUs, and Market-based PSUs
Summary of unearned SBC expense
Estimated weighted average amortization period		2 years 24 days	2 years 3 months 7 days
Employee Stock Purchase Plan
Summary of unearned SBC expense
Estimated weighted average amortization period		10 months 24 days	8 months 6 days
Cost of revenue
Share-based Compensation
Stock-based compensation expense		$ 8		4	$ 16	8
Research and development
Share-based Compensation
Stock-based compensation expense		76		44	150	85
Sales, general and administrative
Share-based Compensation
Stock-based compensation expense		$ 48		$ 33	$ 96	$ 65

[1] Includes the number of PSUs granted 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 the number of market-based PSUs granted 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.