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Employee Defined Combination Plan - Additional Information (Detail) $ in Millions, ¥ in Billions | 12 Months Ended
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Retirement Benefits [Abstract] |  |  |  |
Amounts incurred for employee defined contribution plan | ¥ 4.6 | $ 647 | ¥ 4.3 | ¥ 4.1

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- Definition Full time employees of the Group in the PRC participate in a government mandated multi-employer defined contribution plan pursuant to which certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees.The line item represents the total amounts expensed as incurred for such employee defined contribution plan. + References No definition available. + Details
Name: | bidu_EmployeeDefinedContributionPlanAmountsExpensed
Namespace Prefix: | bidu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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