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Organization, Consolidation and Presentation of Financial Statements - Additional Information (Detail) In Millions, unless otherwise specified	1 Months Ended		12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2014 Baidu Netcom CNY	Dec. 31, 2014 Beijing Perusal CNY	Dec. 31, 2014 Baidu Pay CNY
Variable Interest Entity [Line Items]
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities			100.0bidu_InterestFreeLoansProvidedBySubsidiaryOfEntityToShareholdersOfItsVariableInterestEntities / dei_LegalEntityAxis = bidu_BaiduNetcomMember	20.0bidu_InterestFreeLoansProvidedBySubsidiaryOfEntityToShareholdersOfItsVariableInterestEntities / dei_LegalEntityAxis = bidu_BeijingPerusalMember	31.5bidu_InterestFreeLoansProvidedBySubsidiaryOfEntityToShareholdersOfItsVariableInterestEntities / dei_LegalEntityAxis = bidu_BaiduPayMember
Equity pledge agreement expiration period			2 years	2 years	2 years
Net liabilities of VIEs	$ 56.36us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet	349.67us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssetsAndLiabilitiesNet
Creditors of the VIEs'third-party liabilities with no recourse to the general credit of the primary beneficiaries	No	No
Exchange rate used for conversion of financial statements from RMB to US dollar	6.2046us-gaap_ForeignCurrencyExchangeRateTranslation1	6.2046us-gaap_ForeignCurrencyExchangeRateTranslation1

X

- Definition

The period after which the equity pledge agreement between the shareholders of the entity's VIE and the entity's subsidiary will expire after expiration of the term or the fulfillment by the entity's VIE and its shareholders of their respective obligations under the exclusive technology consulting and service agreement and the loan agreement.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.

+ References

No definition available.

+ Details

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

X

- Definition

A statement by the reporting entity that the creditors (or beneficial interest holders) of the consolidated Variable Interest Entity (VIE) have no recourse to the general credit of the primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685

+ Details

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Namespace Prefix:	us-gaap_
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- Details

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