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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 ($) | Dec. 31, 2013 Class B Ordinary Shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 870,400,000 us-gaap_CommonStockSharesAuthorized | 870,400,000 us-gaap_CommonStockSharesAuthorized |  |  |  | 10,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember | 825,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 825,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 35,400,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 35,400,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Par value per share (US$) | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare |  |  | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | $ 0.00005 us-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 | 45,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities | 45,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities | 225,079 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities | 225,079 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities | 40,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  | 27,613,315 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 27,492,452 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 7,492,921 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 7,537,921 us-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 | $ 1.22 bidu_AmountOfRestrictedPaidUpCapitalAndStatutoryReserveFundsOfSubsidiariesAndNetAssetsOfVariableInterestEntities | 7.54 bidu_AmountOfRestrictedPaidUpCapitalAndStatutoryReserveFundsOfSubsidiariesAndNetAssetsOfVariableInterestEntities |  | 3.72 bidu_AmountOfRestrictedPaidUpCapitalAndStatutoryReserveFundsOfSubsidiariesAndNetAssetsOfVariableInterestEntities |  |  |  |  |  |

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