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Stock-Based Plans (Tables)
3 Months Ended
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity
The following table summarizes stock option activity for the three months ended March 31, 2014:  
 
Options
 
(In millions)
Outstanding as of January 1, 2014
14

Granted and assumed

Exercised
(2
)
Forfeited/expired/canceled

Outstanding as of March 31, 2014
12

Schedule of restricted stock unit activity
The following table summarizes restricted stock unit ("RSU") activity for the three months ended March 31, 2014:  
 
Units 
 
(In millions)
Outstanding as of January 1, 2014
34

Awarded and assumed
3

Vested
(5
)
Forfeited
(1
)
Outstanding as of March 31, 2014
31

Schedule of stock-based compensation expense
The impact on our results of operations of recording stock-based compensation expense for the three months ended March 31, 2014 and 2013 was as follows:
 
 
Three Months Ended March 31,
 
2014
 
2013
 
(In millions)
Cost of net revenues
$
17

 
$
13

Sales and marketing
42

 
33

Product development
51

 
32

General and administrative
39

 
33

Total stock-based compensation expense
$
149

 
$
111

Capitalized in product development
$
4

 
$
3

Weighed average assumptions
The following weighted average assumptions were used for the three months ended March 31, 2014 and 2013:
 
 
Three Months Ended March 31,
 
2014
 
2013
Risk-free interest rate
1.06
%
 
0.49
%
Expected life (in years)
3.9

 
3.8

Dividend yield
%
 
%
Expected volatility
29
%
 
34
%