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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Employee Benefit Plans Employee Benefit Plans

Restricted Stock Unit Activity

The following table presents restricted stock unit (“RSU”) activity (including performance-based RSUs that have been earned) under our equity incentive plans as of and for the six months ended June 30, 2018 (in millions):  
 
Units 
Outstanding as of January 1, 2018
42

Awarded
17

Vested
(12
)
Forfeited
(3
)
Outstanding as of June 30, 2018
44



The weighted average grant date fair value for RSUs awarded during the six months ended June 30, 2018 was $40.19 per share.

Stock-Based Compensation Expense

The impact on our results of operations of recording stock-based compensation expense for the three and six months ended June 30, 2018 and 2017 was as follows (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Cost of net revenues
$
16

 
$
15

 
$
29

 
$
26

Sales and marketing
31

 
28

 
56

 
49

Product development
58

 
50

 
103

 
86

General and administrative
46

 
44

 
83

 
77

Total stock-based compensation expense
$
151

 
$
137

 
$
271

 
$
238

Capitalized in product development
$
4

 
$
3

 
$
7

 
$
6