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FAIR VALUE MEASUREMENT- Additional Information (Detail) (CNY) In Millions, unless otherwise specified | 12 Months Ended
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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