Stock Based Compensation (Tables)

12 Months Ended

Jan. 28, 2018

Notes to financial statements [Abstract]

Stock-based compensation expense, net of amounts capitalized as inventory

	Year Ended
	January 28, 2018		January 29, 2017		January 31, 2016
	(In millions)
Cost of revenue	$	21	$	15	$	15
Research and development	219		134		115
Sales, general and administrative	151		98		74
Total	$	391	$	247	$	204

Summary of equity awards granted under equity incentive plans

	Year Ended
	January 28, 2018		January 29, 2017		January 31, 2016
	(In millions, except per share data)
RSUs, PSUs and Market-based PSUs
Awards granted	6		12		13
Estimated total grant-date fair value	$	929	$	591	$	296
Weighted average grant-date fair value (per share)	$	145.91	$	50.57	$	22.01
ESPP
Shares purchased	5		4		6
Weighted average price (per share)	$	21.24	$	18.51	$	13.67
Weighted average grant-date fair value (per share)	$	7.12	$	5.80	$	4.53

Summary of unearned stock-based compensation expense

	January 28, 2018		January 29, 2017
	(In millions)
Aggregate unearned stock-based compensation expense	$	1,091	$	627
Estimated weighted average remaining amortization period	(In years)
RSUs, PSUs and market-based PSUs	2.3		2.6
ESPP	0.7		0.6

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

	Year Ended
	January 28, 2018	January 29, 2017	January 31, 2016
	(Using the Black-Scholes model)
ESPP
Weighted average expected life (in years)	0.5-2.0	0.5-2.0	0.5-2.0
Risk-free interest rate	0.8%-1.4%	0.5%-0.9%	0.1%-0.7%
Volatility	40%-54%	30%-39%	24%-34%
Dividend yield	0.3%-0.5%	0.7%-1.4%	1.5%-1.8%

Schedule of Share-based Compensation, Activity

	RSUs, PSUs and Market-based PSUs Outstanding
	Number of Shares		Weighted Average Grant-Date Fair Value
	(In millions, except years and per share data)
Balances, January 29, 2017	27		$	32.84
Granted (1)(2)	6		$	145.91
Vested restricted stock	(11	)	$	28.80
Canceled and forfeited	—		$	—
Balances, January 28, 2018	22		$	66.72
Vested and expected to vest after January 28, 2018	18		$	66.43

(1) Includes PSUs that will be issued and eligible to vest based on the corporate financial performance maximum target level achieved for fiscal year 2018.

(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 that period, the market-based PSUs issued could be up to 0.1 million shares.