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SUBSEQUENT EVENTS - Additional Information (Detail) (Subsequent Event [Member]) In Millions, unless otherwise specified	Feb. 08, 2012 Amount Received USD ($)	Feb. 08, 2012 Amount Received CNY	Feb. 08, 2012 Total Amount to be Granted USD ($)	Feb. 08, 2012 Total Amount to be Granted CNY
Subsequent Event [Line Items]
Government subsidy	$ 23.83	150.00	$ 63.55	400.00

X

- Definition

The amount of government subsidies.

+ References

No definition available.

+ Details

Name:	bidu_GovernmentSubsidy
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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