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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 |
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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 |  |  |  | 3,428,777 us-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 |  |  |  |  | $ 36.23 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 224.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 114.21 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 200.91 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |
Total fair value of options vested |  |  |  |  | 24.05 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 149.22 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 123.44 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 53.56 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation cost |  |  |  |  | 44.07 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 273.44 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  | 217.84 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,350.00 us-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 |  |  |  |  | $ 755.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 419.80 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 323.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested during respective years, restricted shares |  |  |  |  |  |  |  |  |  |  | $ 52.28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 324.41 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 247.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 128.70 us-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 |  |  | $ 1,815.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | $ 1,815.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 1,137.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 1,152.10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |

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- Definition The minimum percentage of a share option's exercise over the fair value of the ordinary share on the date of that grant. + References No definition available. + Details
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- Definition The minimum percentage of voting power held by an employee whose granted incentive share option's term are subject to a maximum of five years, and the exercise price cannot be less than 110% of the fair market value of the company's ordinary shares on the date of that grant. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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