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Employee Defined Combination Plan - Additional Information (Detail) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total amounts incurred for employee defined contribution plan | $ 101.32 | 631.25 | 381.74 | 218.88

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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. + References No definition available. + Details
Name: | bidu_EmployeeDefinedContributionPlan
Namespace Prefix: | bidu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration