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Restricted Net Assets - Additional Information (Detail) ¥ in Billions, $ in Billions | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
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Stockholders' Equity Note [Abstract] |  |  |
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs | $ 3.8 | ¥ 26.1 | ¥ 18.6

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- Definition Amount of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs as of the end of the most recently completed fiscal year. + References No definition available. + Details
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Namespace Prefix: | bidu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration