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Total Share-Based Compensation Cost Recognized (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Capitalized as part of internal-used software | $ 0 | ¥ 0 | ¥ 0 | ¥ 1
Cost of revenues |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 28 | 183 | 103 | 49
Cost of revenues | iQIYI |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 5 | 35 | 9 | 6
Selling, general and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 150 | 973 | 429 | 487
Selling, general and administrative | iQIYI |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 20 | 131 | 30 | 21
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 321 | 2,088 | 1,228 | 851
Research and development | iQIYI |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | $ 11 | ¥ 67 | ¥ 23 | ¥ 17

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