Stock Based Compensation (Tables)

12 Months Ended

Jan. 31, 2016

Notes to financial statements [Abstract]

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

	Year Ended
	January 31, 2016		January 25, 2015		January 26, 2014
	(In millions)
Cost of revenue	$	15	$	12	$	11
Research and development	115		88		83
Sales, general and administrative	74		58		42
Total	$	204	$	158	$	136

Summary of equity awards granted under equity incentive plans

	Year Ended
	January 31,		January 25,		January 26,
	2016		2015		2014
	(In millions, except per share data)
Stock Options
Awards granted	—		—		6
Estimated total grant-date fair value	$	—	$	—	$	21
Weighted average grant-date fair value (per share)	$	—	$	—	$	3.47
RSUs, PSUs and Market-based PSUs
Awards granted	13		13		11
Estimated total grant-date fair value	$	296	$	228	$	145
Weighted average grant-date fair value (per share)	$	22.01	$	17.68	$	13.46
ESPP
Shares purchased	6		7		6
Weighted average price (per share)	$	13.67	$	10.99	$	10.79
Weighted average grant-date fair value (per share)	$	4.53	$	4.99	$	5.60

Summary of unearned stock-based compensation expense

	January 31,		January 25,
	2016		2015
	(In millions)
Unearned stock-based compensation expense	$	381	$	291
Estimated weighted average remaining amortization period	(In years)
Stock Options	1.1		1.8
RSUs, PSUs and Market-based PSUs	2.7		2.8
ESPP	0.7		0.5

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

	Year Ended
	January 31, 2016	January 25, 2015	January 26, 2014
	(Using a binomial model)
Stock Options
Weighted average expected life (in years)	—	—	2.4-3.5
Risk-free interest rate	—	—	1.8%-3.0%
Volatility	—	—	28%-37%
Dividend yield	—	—	1.9%-2.4%

	Year Ended
	January 31, 2016	January 25, 2015	January 26, 2014
	(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	0.1%-0.7%	0.1%-0.5%	0.1%-0.4%
Volatility	24%-34%	23%-31%	32%-37%
Dividend yield	1.5%-1.8%	1.7%-1.9%	2.0%-2.4%

Schedule of Share-based Compensation, Activity

	RSUs, PSUs and Market-based PSUs Outstanding				Options Outstanding
	Number of Shares		Weighted Average Grant-Date Fair Value		Numberof Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining   Contractual Life	Aggregate Intrinsic Value (3)
	(In millions, except years and per share data)
Balances, January 25, 2015	23		$	15.94	21		$	14.61
Granted (1)(2)	13		$	22.01	—		$	—
Exercised	—		—		(7	)	$	14.60
Vested restricted stock	(8	)	$	15.56	—		—
Canceled and forfeited	(2	)	$	16.63	(1	)	$	17.28
Balances, January 31, 2016	26		$	19.12	13		$	14.49	5.9	$	197
Exercisable as of January 31, 2016					11		$	14.51	5.6	$	159
Vested and expected to vest after January 31, 2016	22		$	19.14	13		$	14.50	5.8	$	191

(1) Includes the total number of PSUs that became eligible to vest based on the corporate financial performance level achieved for fiscal year 2016.

(2) Includes the market-based PSUs that become 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 that become eligible to vest could range from 0 to 0.4 million shares. We granted market-based PSUs during the first quarter of fiscal year 2016 to our CEO and senior management as approved by our Compensation Committee.

(3) The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value for in-the-money options at January 31, 2016, based on the $29.29 closing price of our common stock on January 29, 2016.