Name:	bidu_EquityPledgeAgreementExpirationPeriod
Namespace Prefix:	bidu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The amount of interest-free loans provided by a subsidiary of the entity to the shareholders of the variable interest entities controlled by the entity.

No definition available.

Name:	bidu_InterestFreeLoansProvidedBySubsidiaryOfEntityToShareholdersOfItsVariableInterestEntities
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Non controlling interest increase from subsidiary equity issuance percentage.

No definition available.

Name:	bidu_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuancePercentage
Namespace Prefix:	bidu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Organization.

No definition available.

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

Percentage of enlarged registered capital in iqiyi by third party.

No definition available.

Name:	bidu_PercentageOfEnlargedRegisteredCapitalInIQIYIByThirdParty
Namespace Prefix:	bidu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Value of investment in iqiyi by third party.

No definition available.

Name:	bidu_ValueOfInvestmentInIqiyiBythirdparty
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of net assets (liabilities).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 30
-Topic 205
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479910/205-30-50-1

Name:	us-gaap_AssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=bidu_BeijingPerusalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=bidu_BaiduNetcomMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: