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Subsequent Events - Additional Information (Detail) - Subsequent event - iQiyi $ in Millions | 1 Months Ended
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Feb. 29, 2016 USD ($)
Subsequent Event [Line Items] |
Disposal of a subsidiary, enterprise valuation | $ 2,800
Disposal of a subsidiary, percent of ownership disposed | 100.00%

X
- Definition The percentage of ownership the Company losses in the previous subsidiary in the disposal. + References No definition available. + Details
Name: | bidu_DisposalGroupPercentOfOwnershipDisposed
Namespace Prefix: | bidu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

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

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bidu_iQiYiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |