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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Unit
Segment
Dec. 31, 2014
CNY
Dec. 31, 2013
CNY
Unit
Dec. 31, 2012
CNY
Dec. 31, 2014
Online Payment Agencies
CNY
Dec. 31, 2013
Online Payment Agencies
CNY
Dec. 31, 2014
Cash and cash equivalents
Maximum
Dec. 31, 2014
Short-term Investments
Maximum
Dec. 31, 2014
Short-term Investments
Minimum
Dec. 31, 2014
Other Long-term Investments
Minimum
Dec. 31, 2014
Credit Concentration Risk
Sales Revenue, Net
Maximum
Dec. 31, 2014
Onshore China
Credit Concentration Risk
Financial Instruments
Dec. 31, 2014
Offshore China
Credit Concentration Risk
Financial Instruments
Dec. 31, 2014
Office building related facility, machinery and equipment
Dec. 31, 2014
Bank of China
Credit Concentration Risk
Financial Instruments
Dec. 31, 2014
China Merchants Bank
Credit Concentration Risk
Financial Instruments
Accounting Policies [Abstract]                                
Number of operating segment 1us-gaap_NumberOfOperatingSegments 1us-gaap_NumberOfOperatingSegments                            
Maturity period used to classify cash and cash equivalent and investments             3 months 12 months 3 months 12 months            
Allowance for doubtful accounts of online payment agencies         0us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bidu_OnlinePaymentAgenciesMember		 0us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bidu_OnlinePaymentAgenciesMember		                    
Fair value long-term notes payable 3,515,403,000us-gaap_NotesPayableFairValueDisclosure 21,811,666,000us-gaap_NotesPayableFairValueDisclosure 14,797,937,000us-gaap_NotesPayableFairValueDisclosure                          
Internal use software development costs capitalized during the period 0us-gaap_CapitalizedComputerSoftwareAdditions 0us-gaap_CapitalizedComputerSoftwareAdditions 2,680,000us-gaap_CapitalizedComputerSoftwareAdditions 38,130,000us-gaap_CapitalizedComputerSoftwareAdditions                        
Amortization expense for capitalized software costs 4,550,000us-gaap_CapitalizedComputerSoftwareAmortization 28,240,000us-gaap_CapitalizedComputerSoftwareAmortization 31,650,000us-gaap_CapitalizedComputerSoftwareAmortization 19,720,000us-gaap_CapitalizedComputerSoftwareAmortization                        
Unamortized amount of capitalized internal use software developed costs (included in intangible assets, net) 2,130,000us-gaap_CapitalizedComputerSoftwareNet 13,240,000us-gaap_CapitalizedComputerSoftwareNet 41,480,000us-gaap_CapitalizedComputerSoftwareNet                          
Property, plant and equipment, salvage value, percentage                           4.00%us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember		    
Number of reporting units the Company has 3us-gaap_NumberOfReportingUnits 3us-gaap_NumberOfReportingUnits 3us-gaap_NumberOfReportingUnits                          
Sale tax and surcharges in cost of revenues 579,850,000us-gaap_ExciseAndSalesTaxes 3,600,000,000us-gaap_ExciseAndSalesTaxes 2,330,000,000us-gaap_ExciseAndSalesTaxes 1,570,000,000us-gaap_ExciseAndSalesTaxes                        
Advertising expenses 62,060,000us-gaap_AdvertisingExpense 385,060,000us-gaap_AdvertisingExpense 191,610,000us-gaap_AdvertisingExpense 326,830,000us-gaap_AdvertisingExpense                        
Cash and cash equivalents, restricted cash and short-term investments $ 9,450,000,000bidu_CashCashEquivalentsRestrictedCashAndShortTermInvestments 58,630,000,000bidu_CashCashEquivalentsRestrictedCashAndShortTermInvestments                            
Concentration risk by percentage                     10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 86.37%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= bidu_FinancialInstrumentsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ bidu_FinancialInstitutionByLocationAxis
= bidu_OnshoreChinaMember		 13.63%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= bidu_FinancialInstrumentsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ bidu_FinancialInstitutionByLocationAxis
= bidu_OffshoreChinaMember		   17.54%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= bidu_FinancialInstrumentsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ bidu_FinancialInstitutionByLegalEntityAxis
= bidu_BankOfChinaMember		 31.26%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= bidu_FinancialInstrumentsMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ bidu_FinancialInstitutionByLegalEntityAxis
= bidu_ChinaMerchantBankMember
Appreciation of US$ against RMB, as a percentage 2.49%bidu_AppreciationOrDepreciationOfReportingCurrencyAgainstFunctionalCurrencyByPercentage 2.49%bidu_AppreciationOrDepreciationOfReportingCurrencyAgainstFunctionalCurrencyByPercentage