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Employee Defined Combination Plan - Additional Information (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Total amounts incurred for employee defined contribution plan	$ 263.86bidu_EmployeeDefinedContributionPlanTotalAmountsExpensed	1,640.00bidu_EmployeeDefinedContributionPlanTotalAmountsExpensed	1,050.00bidu_EmployeeDefinedContributionPlanTotalAmountsExpensed	631.25bidu_EmployeeDefinedContributionPlanTotalAmountsExpensed

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- Definition

Full time employees of the Group in the PRC participate in a government mandated multi-employer defined contribution plan pursuant to which certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees.The line item represents the total amounts expensed as incurred for such employee defined contribution plan.

+ References

No definition available.

+ Details

Name:	bidu_EmployeeDefinedContributionPlanTotalAmountsExpensed
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

Name:	us-gaap_DefinedContributionPensionAndOtherPostretirementPlansDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration