Employee Benefit Plans - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Stock-based compensation expense | $ 101 | $ 88 |
| Cost of net revenues | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Stock-based compensation expense | 11 | 7 |
| Sales and marketing | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Stock-based compensation expense | 21 | 21 |
| Product development | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Stock-based compensation expense | 36 | 31 |
| Capitalized in product development | 3 | 3 |
| General and administrative | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Stock-based compensation expense | $ 33 | $ 29 |