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Stock Based Compensation (Tables)
 6 Months Ended
Jul. 26, 2015
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 26,
2015
 
July 27,
2014
 
July 26,
2015
 
July 27,
2014
 
(In millions)
Cost of revenue
$
3

 
$
3

 
$
6

 
$
6

Research and development
27

 
21

 
54

 
42

Sales, general and administrative
17

 
14

 
33

 
26

Total
$
47

 
$
38

 
$
93

 
$
74
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
 
Awards Outstanding
 
Weighted Average Exercise Price
Stock Options
(In millions)
 
(Per share)
Balances, January 25, 2015
21

 
$14.61
Granted
—

 
—

Exercised
(4
)
 
$14.16
Cancelled
—

 
—

Balances, July 26, 2015
17

 
$14.61
 
Awards Outstanding
 
Weighted Average Grant-Date Fair Value
RSUs, PSUs and Market-based PSUs
(In millions)
 
(Per share)
Balances, January 25, 2015
23

 
$15.94
Granted (1) (2)
4

 
$21.65
Vested
(4
)
 
$15.04
Cancelled
(1
)
 
$15.99
Balances, July 26, 2015
22

 
$17.12

(1)
Includes the total PSUs issuable if the corporate financial performance maximum target level for fiscal year 2016 is achieved. Depending on the actual level of achievement of the corporate performance target at the end of fiscal year 2016, the PSUs issued could range from 0 to 2 million shares. We granted PSUs during the first quarter of fiscal year 2016 to our CEO and senior management as approved by our Compensation Committee.
(2)
Includes the market-based PSUs issuable 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 0.4 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.
Summary of unearned stock-based compensation expense
 
July 26,
 
January 25,
 
2015
 
2015
 
(In millions)
Aggregated unearned stock-based compensation expense
$288
 
$291
 
 
 
 
Estimated weighted average amortization period
(In years)
Stock options
1.5
 
1.8
RSUs, PSUs and market-based PSUs
2.6
 
2.8
ESPP
0.7
 
0.5