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Employee Benefit Plans | 9 Months Ended
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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 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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