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SEGMENT REPORTING - Additional Information (Detail)	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of operating segment	1

X

- Definition

The number of operating segment the entity has.

+ References

No definition available.

+ Details

Name:	bidu_NumberOfOperatingSegment
Namespace Prefix:	bidu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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