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Unaudited Interim Condensed Consolidated Statements Of Comprehensive Income (Parenthetical)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Class A Ordinary Shares
Number of American depositary shares (ADSs) representing one Class A ordinary share	10	10	10	10

X

- Definition

The number of American Depositary Shares ("ADSs") that represents one Class A ordinary share.

+ References

No definition available.

+ Details

Name:	bidu_AmericanDepositorySharesToSharesRatio
Namespace Prefix:	bidu_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: