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Subsequent Events - Additional Information (Detail) - Sep. 30, 2020 ¥ in Billions, $ in Billions | CNY (¥) | USD ($)
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Subsequent Event [Member] | Obligations [Member] |  |
Subsequent Event [Line Items] |  |
Investment commitments | ¥ 20 | $ 2.9

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- Definition Amount of funds committed to investment company from investors. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10491-115837 + Details
Name: | us-gaap_InvestmentCompanyCommittedCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bidu_CommitmentAndContingenciesAxis=us-gaap_ObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |