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Subsequent Events - Additional Information (Detail) - Subsequent event - iQiyi $ in Millions	1 Months Ended
	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: