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EARNINGS PER SHARE ("EPS") - Additional Information (Detail)	12 Months Ended	16 Months Ended	20 Months Ended
	Dec. 31, 2010	May 12, 2010	Dec. 31, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Previous Ratio of ADS-to-Class A Ordinary Share		one ADS for one share
Current Ratio of ADS-to-Class A Ordinary Share			ten ADSs for one share
The split whose effect is the same with the entity's change of the ADS to Class A ordinary share ratio	ten-for-one ADS split

X

- Definition

The current ratio of the entity's American depositary shares ("ADSs") representing Class A ordinary shares, which is effective from May 12, 2010 to Dec. 31, 2011.

+ References

No definition available.

+ Details

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

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- Definition

The previous ratio of the entity's American depositary shares ("ADSs") representing Class A ordinary shares, which is effective from the time of the entity's IPO to May 11, 2010.

+ References

No definition available.

+ Details

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

X

- Definition

The split whose effect is the same with the entity's change of the ADS to Class A ordinary share ratio.

+ References

No definition available.

+ Details

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

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- Details

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