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Components of Income Tax (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY
Income Tax Disclosure [Abstract]
Current income tax	$ 474,192us-gaap_CurrentIncomeTaxExpenseBenefit	2,942,173us-gaap_CurrentIncomeTaxExpenseBenefit	2,006,980us-gaap_CurrentIncomeTaxExpenseBenefit	1,888,378us-gaap_CurrentIncomeTaxExpenseBenefit
Income tax refund due to reduced tax rate	(2,829)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions	(17,553)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions	(508,686)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions	(255,189)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Adjustments of deferred tax assets due to reduced tax rates	4,536us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	28,146us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	21,573us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability	0us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
Deferred income tax (benefit) expense	(116,300)bidu_DeferredIncomeTaxExpenseBenefitExcludeAdjustmentsDueToReducedTaxRates	(721,594)bidu_DeferredIncomeTaxExpenseBenefitExcludeAdjustmentsDueToReducedTaxRates	309,063bidu_DeferredIncomeTaxExpenseBenefitExcludeAdjustmentsDueToReducedTaxRates	(59,030)bidu_DeferredIncomeTaxExpenseBenefitExcludeAdjustmentsDueToReducedTaxRates
Taxation for the year	$ 359,599us-gaap_IncomeTaxExpenseBenefit	2,231,172us-gaap_IncomeTaxExpenseBenefit	1,828,930us-gaap_IncomeTaxExpenseBenefit	1,574,159us-gaap_IncomeTaxExpenseBenefit

X

- Definition

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations exclude adjustments of deferred tax assets due to reduced tax rates.

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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-Name Accounting Standards Codification

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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