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Shareholder's Equity - Additional Information (Detail)
In Billions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2012
Dec. 31, 2014
Preferred Stock
USD ($)
Dec. 31, 2014
Class A Ordinary Shares
USD ($)
Dec. 31, 2013
Class A Ordinary Shares
Dec. 31, 2014
Class B Ordinary Shares
USD ($)
Dec. 31, 2013
Class B Ordinary Shares
Stockholders Equity Note [Line Items]                    
Common stock, shares authorized 870,400,000us-gaap_CommonStockSharesAuthorized 870,400,000us-gaap_CommonStockSharesAuthorized       10,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember		 825,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 825,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 35,400,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 35,400,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Par value per share (US$) $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare   $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare     $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_PreferredStockMember		 $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		  
Number of votes per share             1   10  
Transfer of Class B ordinary shares to Class A Ordinary shares 45,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 45,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 225,079us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 225,079us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 40,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities          
Common stock, shares outstanding             27,613,315us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 27,492,452us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 7,492,921us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 7,537,921us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Allocation of after-tax profits to general reserve fund, percentage 10.00%bidu_AppropriationOfAfterTaxProfitToGeneralReserveFundRequiredMinimumPercentage 10.00%bidu_AppropriationOfAfterTaxProfitToGeneralReserveFundRequiredMinimumPercentage                
Limit of general reserve fund as a percentage of registered capital, after which allocations to general reserve fund are no longer required 50.00%bidu_AppropriationOfAfterTaxProfitToGeneralReserveFundLimitRegisteredCapitalPercentage 50.00%bidu_AppropriationOfAfterTaxProfitToGeneralReserveFundLimitRegisteredCapitalPercentage                
Allocation of after-tax profits to statutory surplus fund, percentage 10.00%bidu_AppropriationOfAfterTaxProfitToStatutorySurplusFundRequiredMinimumPercentage 10.00%bidu_AppropriationOfAfterTaxProfitToStatutorySurplusFundRequiredMinimumPercentage                
Limit of statutory surplus fund as a percentage of registered capital, after which allocations to statutory surplus fund are no longer required 50.00%bidu_AppropriationOfAfterTaxProfitToStatutorySurplusFundLimitRegisteredCapitalPercentage 50.00%bidu_AppropriationOfAfterTaxProfitToStatutorySurplusFundLimitRegisteredCapitalPercentage                
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs $ 1.22bidu_AmountOfRestrictedPaidUpCapitalAndStatutoryReserveFundsOfSubsidiariesAndNetAssetsOfVariableInterestEntities 7.54bidu_AmountOfRestrictedPaidUpCapitalAndStatutoryReserveFundsOfSubsidiariesAndNetAssetsOfVariableInterestEntities   3.72bidu_AmountOfRestrictedPaidUpCapitalAndStatutoryReserveFundsOfSubsidiariesAndNetAssetsOfVariableInterestEntities