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Fair Value Measurements - 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 (¥)
Disclosure Reconciliation Of Changes In Fair Value [Abstract] |  |  |  |  |  |
Long-term investments impartment charges | $ 45 | ¥ 298 | ¥ 197 | $ 58 | ¥ 396 | ¥ 197

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- Definition Disclosure Reconciliation Of Changes In Fair Value [Abstract] + References No definition available. + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
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