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Investments - Short-term Investments - Additional information (Detail) ¥ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 30, 2017 CNY (¥) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 30, 2017 CNY (¥)
Schedule of Investments [Line Items] |  |  |  |  |  |
Investment interest income | $ 183 | ¥ 1,258 | ¥ 876 | $ 431 | ¥ 2,961 | ¥ 2,237
Short-term Investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Investment interest income | $ 160 | ¥ 1,100 | ¥ 823 | $ 391 | ¥ 2,700 | ¥ 2,100

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- Details
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