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Share Based Award Plan - Additional Information of Baidu, Inc. (Detail)
In Millions, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2014
Stock Options
2008 Plan
Maximum
Dec. 31, 2014
Stock Options
2008 Plan
Minimum
Dec. 31, 2014
Parent Company
USD ($)
Dec. 31, 2014
Parent Company
2008 Plan
Dec. 31, 2014
Parent Company
Stock Options
USD ($)
Dec. 31, 2014
Parent Company
Stock Options
CNY
Dec. 31, 2013
Parent Company
Stock Options
USD ($)
Dec. 31, 2013
Parent Company
Stock Options
CNY
Dec. 31, 2012
Parent Company
Stock Options
USD ($)
Dec. 31, 2012
Parent Company
Stock Options
CNY
Dec. 31, 2014
Parent Company
Restricted Stock
USD ($)
Dec. 31, 2014
Parent Company
Restricted Stock
CNY
Dec. 31, 2013
Parent Company
Restricted Stock
USD ($)
Dec. 31, 2013
Parent Company
Restricted Stock
CNY
Dec. 31, 2012
Parent Company
Restricted Stock
USD ($)
Dec. 31, 2012
Parent Company
Restricted Stock
CNY
Dec. 31, 2014
Parent Company
Restricted Stock
Maximum
Dec. 31, 2014
Parent Company
Restricted Stock
Minimum
Dec. 31, 2014
Parent Company
Employee Holding No More Than Ten Percent Voting Power
Maximum
Dec. 31, 2014
Parent Company
Employee Holding More Than Ten Percent Voting Power
Maximum
Dec. 31, 2014
Parent Company
Employee Holding More Than Ten Percent Voting Power
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Number of shares authorized for issuance       3,428,777us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_PlanNameAxis
= bidu_StockIncentivePlanTwentyZeroEightMember
                                 
Contractual term of share-based awards granted                                     10 years 5 years  
Percentage of voting power     10.00%bidu_MinimumPercentageOfVotingPowerOfEntitysShareCapital
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                                   
Shares vesting term 4 years 2 years                             4 years 2 years      
Percentage of the fair market value of the entity's ordinary shares                                         110.00%bidu_ExercisePriceAsPercentageOfFairValueOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ bidu_ShareBasedAwardsGranteeAxis
= bidu_EmployeeHoldingMoreThanTenPercentVotingPowerMember
Total intrinsic value of options exercised         $ 36.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
224.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  114.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  200.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                     
Total fair value of options vested         24.05us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
149.22us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  123.44us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  53.56us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                     
Unrecognized share-based compensation cost         44.07us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
273.44us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
        217.84us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,350.00us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                 
A weighted-average vesting period over which the deferred cost is expected to be recognized         2 years 4 months 6 days 2 years 4 months 6 days         3 years 7 days 3 years 7 days                  
The weighted-average grant-date fair value of options granted during respective years         $ 755.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  $ 419.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  $ 323.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                       
Total fair value of shares vested during respective years, restricted shares                     $ 52.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
324.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  247.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  128.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
         
The weighted-average grant-date fair value of restricted shares granted during respective years     $ 1,815.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
              $ 1,815.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  $ 1,137.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  $ 1,152.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember