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FAIR VALUE MEASUREMENT- Additional Information (Detail) (CNY) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
The amount of fair value to which the carrying amounts of certain cost and equity method investments (Note 4), goodwill (Note 8) and intangible assets (Note 8) are written down	0

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- Details

Name:	bidu_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems
Namespace Prefix:	bidu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

This element represents the fair value of certain assets measured on a nonrecurring basis.

+ References

No definition available.

+ Details

Name:	bidu_FairValueOfCertainAssetsMeasuredOnNonrecurringBasis
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration