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Income Taxes - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended | 36 Months Ended | 12 Months Ended | 24 Months Ended | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2014 Baidu Japan JPY (¥) | Dec. 31, 2014 Certain PRC Subsidiaries and VIEs High And New Technology Enterprise | Dec. 31, 2014 Certain PRC Subsidiaries and VIEs Expiration Period One High And New Technology Enterprise | Dec. 31, 2014 Certain PRC Subsidiaries and VIEs Expiration Period Two High And New Technology Enterprise | Dec. 31, 2014 Certain PRC Subsidiaries and VIEs Expiration Period Three High And New Technology Enterprise | Dec. 31, 2014 Baidu Online Key Software Enterprise | Dec. 31, 2014 China | Dec. 31, 2014 China Maximum | Dec. 31, 2014 China Earliest Tax Year | Dec. 31, 2014 China Latest Tax Year | Dec. 31, 2014 Japan | Dec. 31, 2014 Japan Maximum | Dec. 31, 2014 Japan Earliest Tax Year | Dec. 31, 2014 Japan Latest Tax Year
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum paid-in capital required for a specified Japan national income tax rate |  |  |  | ¥ 100,000,000 bidu_MinimumAmountOfPaidInCapitalForSpecifiedNationalIncomeTaxRateOfForeignCountry / dei_LegalEntityAxis = bidu_BaiduJapanMember |  |  |  |  |  |  |  |  |  |  |  |  |
A specified Japan national income tax rate |  |  |  | 30.00%bidu_SpecifiedNationalIncomeTaxRateOfForeignCountry / dei_LegalEntityAxis = bidu_BaiduJapanMember |  |  |  |  |  |  |  |  |  |  |  |  |
Unified statutory income tax rate under current EIT law | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferential enterprise income tax rate, effective period |  |  |  |  | 3 years |  |  |  | 2 years |  |  |  |  |  |  |  |
A preferential enterprise income tax rate |  |  |  |  | 15.00%bidu_IncomeTaxPreferentialTaxRate / dei_LegalEntityAxis = bidu_CertainPrcSubsidiariesAndViesMember / bidu_QualificationSubjectToPreferentialEnterpriseIncomeTaxRateAxis = bidu_HighAndNewTechnologyEnterpriseMember |  |  |  | 10.00%bidu_IncomeTaxPreferentialTaxRate / dei_LegalEntityAxis = bidu_BaiduOnlineMember / bidu_QualificationSubjectToPreferentialEnterpriseIncomeTaxRateAxis = bidu_KeySoftwareEnterpriseMember |  |  |  |  |  |  |  |
Tax holiday, expiration date |  |  |  |  |  | Jan. 01, 2015 | Jan. 01, 2016 | Jan. 01, 2017 | Jan. 01, 2015 |  |  |  |  |  |  |  |
Statutory withholding tax rate to which dividends paid by a FIE to any of its foreign non-resident enterprise investors are subject | 10.00%bidu_StatutoryWithholdingTaxRateForDividend | 10.00%bidu_StatutoryWithholdingTaxRateForDividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special withholding tax rate to which dividends paid by a FIE to its foreign non-resident enterprise investors of certain jurisdictions are subject | 5.00%bidu_SpecialWithholdingTaxRateForDividend | 5.00%bidu_SpecialWithholdingTaxRateForDividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carry forwards | 842,090,000 us-gaap_OperatingLossCarryforwards | 5,220,000,000 us-gaap_OperatingLossCarryforwards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning expiration date of net operating loss |  |  |  |  |  |  |  |  |  | Jan. 01, 2017 |  |  |  | Jan. 01, 2015 |  |  |
Accrued withholding tax | 95,789,000 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | 594,336,000 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | 580,720,000 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undistributed earnings no withholding tax has accrued | $ 7,970,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries | 49,440,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time period that tax authorities could conduct examinations of entity's tax filings |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  | 7 years |  |
Tax years remain open to examination by respective taxing jurisdictions |  |  |  |  |  |  |  |  |  |  |  | 2010 | 2014 |  |  | 2008 | 2014

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- Definition The minimum amount of Paid in Capital in connection with a specified national income tax rate in jurisdictions other than China. + References No definition available. + Details
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- Definition The special withholding tax rate to which dividends paid by a foreign-invested enterprise onshore in China to any of its Hong Kong non-resident enterprise investors offshore are subject. These Hong Kong investors must meet the requirements stipulated by China's tax regulations. + References No definition available. + Details
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- Definition The statutory withholding tax rate to which dividends paid by a foreign-invested enterprise onshore China to any of its foreign non-resident enterprise investors offshore are subject. + References No definition available. + Details
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