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Goodwill and Intangible Assets - Additional Information (Detail) ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 CNY (¥) Unit | Dec. 31, 2023 USD ($) Unit | Dec. 31, 2022 CNY (¥) Unit | Dec. 31, 2021 CNY (¥)
Amortization Of Intangible Assets Disclosure [Abstract] |  |  |  |
Number of reporting units the company | 3 | 3 | 3 |
Amortization expense of intangible assets | ¥ 403 | $ 57 | ¥ 467 | ¥ 471

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- Definition Amortization expense of intangible assets. + References No definition available. + Details
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Period Type: | duration

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- Definition Amortization Of Intangible Assets Disclosure [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The number of reporting units the company split Baidu reporting unit into. + References No definition available. + Details
Name: | bidu_NumberOfReportingUnitsCompanySplitBaiduReportingUnitInto
Namespace Prefix: | bidu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration