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Stock Based Compensation (Tables)
 6 Months Ended
Jul. 31, 2016
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]  
Stock-based compensation expense, net of amounts capitalized as inventory
 
Three Months Ended
 
Six Months Ended
 
July 31,
2016
 
July 26,
2015
 
July 31,
2016
 
July 26,
2015
 
(In millions)
Cost of revenue
$
4

 
$
3

 
$
8

 
$
6

Research and development
30

 
27

 
59

 
54

Sales, general and administrative
24

 
17

 
44

 
33

Total
$
58

 
$
47

 
$
111

 
$
93
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
 
RSUs, PSUs and Market-based PSUs Outstanding
 
Options Outstanding
 
Number of Shares
 
Weighted Average Grant-Date Fair Value Per Share
 
Number of Shares
 
Weighted Average Exercise Price Per Share
 
(In millions, except per share data)
Balances, January 31, 2016
26

 
$
19.12

 
13

 
$
14.49

Granted (1) (2)
4

 
$
33.80

 
—

 
$
—

Exercised
—

 
$
—

 
(3
)
 
$
14.26

Vested restricted stock
(4
)
 
$
16.68

 
—

 
$
—

Canceled and forfeited
—

 
$
—

 
—

 
$
—

Balances, July 31, 2016
26

 
$
21.89

 
10

 
$
14.57



(1)
Includes PSUs that will be issued and eligible to vest if the corporate financial performance maximum target level for fiscal year 2017 is achieved. Depending on the actual level of achievement of the corporate performance target at the end of fiscal year 2017, the PSUs issued could range from 0 to 2 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 range from 0 to 0.3 million shares.
Summary of unearned stock-based compensation expense
 
July 31,
 
January 31,
 
2016
 
2016
 
(In millions)
Aggregate unearned stock-based compensation expense
$
392

 
$
381

 
 
 
 
Estimated weighted average amortization period
(In years)
Stock options
0.8

 
1.1

RSUs, PSUs and market-based PSUs
2.6

 
2.7

ESPP
0.6

 
0.7