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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
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       ¥ 100,000,000bidu_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 842,090,000us-gaap_OperatingLossCarryforwards 5,220,000,000us-gaap_OperatingLossCarryforwards                              
Beginning expiration date of net operating loss                   Jan. 01, 2017       Jan. 01, 2015      
Accrued withholding tax 95,789,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 594,336,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 580,720,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings                            
Undistributed earnings no withholding tax has accrued $ 7,970,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries 49,440,000,000us-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