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Employee Benefit Plans
 9 Months Ended
Sep. 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 nine months ended September 30, 2018 (in millions):  
 
Units 
Outstanding as of January 1, 2018
42

Awarded
18

Vested
(15
)
Forfeited
(7
)
Outstanding as of September 30, 2018
38



The weighted average grant date fair value for RSUs awarded during the nine months ended September 30, 2018 was $39.92 per share.

Stock-Based Compensation Expense

The impact on our results of operations of recording stock-based compensation expense for the three and nine months ended September 30, 2018 and 2017 was as follows (in millions):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Cost of net revenues
$
14

 
$
14

 
$
43

 
$
40

Sales and marketing
26

 
19

 
82

 
68

Product development
45

 
45

 
148

 
131

General and administrative
40

 
40

 
123

 
117

Total stock-based compensation expense
$
125

 
$
118

 
$
396

 
$
356

Capitalized in product development
$
3

 
$
4

 
$
10

 
$
10