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Organization, Consolidation and Presentation of Financial Statements - Additional Information (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 29, 2017
Variable Interest Entity [Line Items]
Net assets of VIEs	$ 780.0	¥ 5,100
Creditors of the VIEs'third-party liabilities with no recourse to the general credit of the primary beneficiaries	No
Exchange rate used for conversion of financial statements from RMB to US dollar			6.5063
Beijing Perusal
Variable Interest Entity [Line Items]
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities	$ 491.0	3,200
Equity pledge agreement expiration period	2 years
Baidu Pay
Variable Interest Entity [Line Items]
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities	$ 33.0	217
Equity pledge agreement expiration period	2 years
Baidu Netcom
Variable Interest Entity [Line Items]
Interest-free loans provided by a subsidiary of the entity to the shareholders of its variable interest entities	$ 334.0	¥ 2,200
Equity pledge agreement expiration period	2 years

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685

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Namespace Prefix:	us-gaap_
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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=77990344&loc=d3e5710-111685

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Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Period Type: