Additional debt principal amount offered.

No definition available.

Name:	bidu_AdditionalDebtPrincipalAmountOffered
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Aggregate principal amount of the 2023 notes outstanding.

+ References

No definition available.

+ Details

Name:	bidu_AggregatePrincipalAmountOfThe2023NotesOutstanding
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cap exercise price of capped call options.

+ References

No definition available.

+ Details

Name:	bidu_CapExercisePriceOfCappedCallOptions
Namespace Prefix:	bidu_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt default event trigger interest default period from due date.

+ References

No definition available.

+ Details

Name:	bidu_DebtDefaultEventTriggerInterestDefaultPeriodFromDueDate
Namespace Prefix:	bidu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Accretion Of Principal Amount Over Remaining Period.

+ References

No definition available.

+ Details

Name:	bidu_DebtInstrumentAccretionOfPrincipalAmountOverRemainingPeriod
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument convertible conversion ratio basis amount.

+ References

No definition available.

+ Details

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

- Definition

Debt Instrument Remaining Accretion Period.

+ References

No definition available.

+ Details

Name:	bidu_DebtInstrumentRemainingAccretionPeriod
Namespace Prefix:	bidu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum period allowed to attend written Notice from trustee or by the trustee at the request of the holders.

+ References

No definition available.

+ Details

Name:	bidu_MaximumPeriodAllowedToAttendWrittenNoticeFromTheTrusteeOrByTheTrusteeAtTheRequestOfTheHolders
Namespace Prefix:	bidu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum percentage of aggregate principal holding by holders.

+ References

No definition available.

+ Details

Name:	bidu_MinimumPercentageOfAggregatePrincipalDebtAmountHoldingByHolders
Namespace Prefix:	bidu_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of business days In which holders Debt conversion right to be enforced.

+ References

No definition available.

+ Details

Name:	bidu_NumberOfBusinessDaysInWhichHoldersDebtConversionRightToBeEnforced
Namespace Prefix:	bidu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of concecutive days for which involuntary case or other proceeding shall remain undismissed and unstayed.

+ References

No definition available.

+ Details

Name:	bidu_NumberOfConcecutiveDaysForWhichInvoluntaryCaseOrOtherProceedingShallRemainUndismissedAndUnstayed
Namespace Prefix:	bidu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Business days In which fundamental change company notice or make whole fundamental change to be issued.

+ References

No definition available.

+ Details

Name:	bidu_NumberOfDaysInWhichFundamentalChangeCompanyNoticeOrMakeWholeFundamentalChangeToBeIssued
Namespace Prefix:	bidu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period In which indebtedness to be cured or discharged.

+ References

No definition available.

+ Details

Name:	bidu_PeriodInWhichIndebtednessToBeCuredOrDischarged
Namespace Prefix:	bidu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of call options on iQIYI's ADS.

+ References

No definition available.

+ Details

Name:	bidu_PriceOfCallOptionsOnIQIYIsADS
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Settlement shares of capped call options.

+ References

No definition available.

+ Details

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

- Definition

The amount of interest cost recognized relating to both the contractual interest coupon and amortization of the discount on the liability component.

+ References

No definition available.

+ Details

Name:	bidu_TheAmountOfInterestCostRecognizedRelatingToBothTheContractualInterestCouponAndAmortizationOfTheDiscountOnTheLiabilityComponent
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Two thousand twenty five convertible notes maturities repayments.

+ References

No definition available.

+ Details

Name:	bidu_TwoThousandTwentyFiveConvertibleNotesMaturitiesRepayments
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Two thousand twenty six convertible notes maturities repayments.

+ References

No definition available.

+ Details

Name:	bidu_TwoThousandTwentySixConvertibleNotesMaturitiesRepayments
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Two thousand twenty three convertible notes maturities repayments.

+ References

No definition available.

+ Details

Name:	bidu_TwoThousandTwentyThreeConvertibleNotesMaturitiesRepayments
Namespace Prefix:	bidu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_DebtDefaultLongtermDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21521-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdTradingDays
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the debt agreement requires the first payment to be made, in YYYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentDateOfFirstRequiredPayment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

+ Details

Name:	us-gaap_DebtInstrumentFrequencyOfPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentPaymentTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the debt instrument was repurchased, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for loan and debt issuance costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bidu_SeniorConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bidu_iQIYITwoThousandTwentyThreeConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=dei_AdrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=bidu_PriorToJune12023DebtConversionConditionOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=bidu_PriorToJune12023DebtConversionConditionTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OptionIndexedToIssuersEquityTypeAxis=us-gaap_CallOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bidu_IqiyiTwoThousandTwentyFiveConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=bidu_PriorToOctober12024DebtConversionConditionOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=bidu_PriorToOctober12024DebtConversionConditionTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bidu_IqiyiTwoThousandTwentySixConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=bidu_PriorToJune152026DebtConversionConditionOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtConversionByUniqueDescriptionAxis=bidu_PriorToJune152026DebtConversionConditionTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bidu_TwoThousandTwentyThreeConvertibleNotesAndTwoThousandTwentyFiveConvertibleNotesAndTwoThousandTwentySixConvertibleNotesCollectivelyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bidu_DebtInstrumentDebtDefaultEventAxis=bidu_DebtDefaultEventTriggerForDelayInPaymentDischargeOfAFinalJudgmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bidu_DebtInstrumentDebtDefaultEventAxis=bidu_DebtDefaultEventTriggerForInvoluntaryCaseOrOtherProceedingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bidu_DebtInstrumentDebtDefaultEventTriggerAxis=bidu_DebtDefaultEventTriggerForDefaultToPayInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bidu_DebtInstrumentDebtDefaultEventTriggerAxis=bidu_DebtDefaultEventTriggerForFailureToEnforceHolderConversionRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bidu_DebtInstrumentDebtDefaultEventTriggerAxis=bidu_DebtDefaultEventTriggerForFailureToIssueFundamentalChangeCompanyNoticeOrMakeWholeFundamentalChangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bidu_DebtInstrumentDebtDefaultEventTriggerAxis=bidu_DebtDefaultEventTriggerForFailureToAttendTrusteeNoticeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bidu_DebtInstrumentDebtDefaultEventTriggerAxis=bidu_DebtDefaultEventTriggerDefaultToDebtUnderMortgageAgreementOrOtherInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Convertible Senior Notes - Additional Information (Detail) $ / shares in Units, ¥ in Millions, $ in Millions							12 Months Ended
	Dec. 31, 2021 USD ($)	Jan. 08, 2021 USD ($)	Dec. 21, 2020 USD ($) Day $ / shares	Dec. 21, 2020 CNY (¥) Day	Mar. 29, 2019 USD ($) Day $ / shares $ / A	Dec. 04, 2018 USD ($) Day $ / shares $ / A	Dec. 31, 2021 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2021 CNY (¥)	Mar. 29, 2019 CNY (¥) $ / A	Dec. 04, 2018 CNY (¥) $ / A
Debt Instrument [Line Items]
Debt maturities repayments in 2023	$ 3						$ 3				¥ 20
Debt maturities repayments in 2025	1,200						1,200				7,600
Debt maturities repayments in 2026	900						900				5,700
Senior Convertible Notes
Debt Instrument [Line Items]
The amount of interest cost recognized relating to both the contractual interest coupon and amortization of the discount on the liability component							$ 175	¥ 1,100	¥ 799	¥ 670
iQIYI 2023 Convertible Senior Notes
Debt Instrument [Line Items]
Debt face amount						$ 750
Interest rate						3.75%							3.75%
Debt, maturity date						Dec. 01, 2023
Debt, put date							Dec. 01, 2021	Dec. 01, 2021
Conversion rate of convertible notes, ADS per US$1,000						37.1830
Effective interest rate						7.04%							7.04%
Aggregate principal amount of the 2023 Notes outstanding	3						$ 3				¥ 20
Debt Instrument Frequency Of Periodic Interest Payment						interest is payable semi-annually
Percentage of principal amount of debt redeemed							100.00%	100.00%
Price of call options on iQIYI's ADS						$ 68
Debt Instrument, convertible, conversion price \| $ / shares						$ 26.89
Repayments of Debt							$ 747	¥ 4,800
Proceeds from Debt, Net ofunderwriting discounts and offering expenses						$ 737
Payment of underwriting discounts and offering expenses						13
Grosss Proceeds from issuance of debt						750
Debt Instrument Convertible Conversion Ratio Basis Amount						$ 1,000
iQIYI 2023 Convertible Senior Notes \| ADR [Member] \| Prior To June 1 2023 Debt Conversion Condition One [Member]
Debt Instrument [Line Items]
Debt Instrument, convertible, threshold trading days \| Day						20
Debt instrument, convertible, threshold consecutive trading days \| Day						30
Debt instrument convertible threshold percentage of stock price trigger						130.00%
iQIYI 2023 Convertible Senior Notes \| ADR [Member] \| Prior To June 1 2023 Debt Conversion Condition Two [Member]
Debt Instrument [Line Items]
Debt Instrument, convertible, threshold trading days \| Day						5
Debt instrument, convertible, threshold consecutive trading days \| Day						10
Debt instrument convertible threshold percentage of stock price trigger						98.00%
iQIYI 2023 Convertible Senior Notes \| Call Option [Member]
Debt Instrument [Line Items]
Price of call options on iQIYI's ADS						$ 68
Cap exercise price of capped call options \| $ / A						38.42							38.42
Settlement Shares Of Capped Call Options \| ¥													¥ 28
iQIYI 2025 Convertible Senior Notes
Debt Instrument [Line Items]
Debt face amount					$ 1,200
Interest rate					2.00%							2.00%
Debt, maturity date					Apr. 01, 2025
Debt, put date							Apr. 01, 2023	Apr. 01, 2023
Conversion rate of convertible notes, ADS per US$1,000					33.0003
Effective interest rate					6.01%							6.01%
Principal amount of liability component	1,200						$ 1,200
Remaining Accretion Period							1 year 3 months	1 year 3 months
Debt Instrument Frequency Of Periodic Interest Payment					interest is payable semi-annually
Percentage of principal amount of debt redeemed							100.00%	100.00%
Price of call options on iQIYI's ADS					$ 85
Settlement Shares Of Capped Call Options \| ¥												¥ 40
Debt instrument, date of first required payment					Oct. 01, 2019
Debt instrument, payment terms					October 1 and April 1 of each year, beginning on October 1, 2019
Proceeds from Debt, Net ofunderwriting discounts and offering expenses					$ 1,200
Payment of underwriting discounts and offering expenses					21
Grosss Proceeds from issuance of debt					1,200
Debt Instrument Convertible Conversion Ratio Basis Amount					$ 1,000
iQIYI 2025 Convertible Senior Notes \| ADR [Member] \| Prior To October 1 2024 Debt Conversion Condition One [Member]
Debt Instrument [Line Items]
Debt Instrument, convertible, conversion price \| $ / shares					$ 30.30
Debt Instrument, convertible, threshold trading days \| Day					20
Debt instrument, convertible, threshold consecutive trading days \| Day					30
Debt instrument convertible threshold percentage of stock price trigger					130.00%
iQIYI 2025 Convertible Senior Notes \| ADR [Member] \| Prior To October 1 2024 Debt Conversion Condition Two [Member]
Debt Instrument [Line Items]
Debt Instrument, convertible, threshold trading days \| Day					5
Debt instrument, convertible, threshold consecutive trading days \| Day					10
Debt instrument convertible threshold percentage of stock price trigger					98.00%
iQIYI 2025 Convertible Senior Notes \| Call Option [Member]
Debt Instrument [Line Items]
Price of call options on iQIYI's ADS					$ 85
Cap exercise price of capped call options \| $ / A					40.02							40.02
IQIYI 2026 Convertible Notes
Debt Instrument [Line Items]
Debt face amount			$ 800
Interest rate			4.00%
Debt, maturity date			Dec. 15, 2026	Dec. 15, 2026
Debt, put date							Aug. 01, 2024	Aug. 01, 2024
Conversion rate of convertible notes, ADS per US$1,000			44.8179	44.8179
Effective interest rate			6.94%
Principal amount of liability component	900						$ 900
Remaining Accretion Period							2 years 7 months 2 days	2 years 7 months 2 days
Debt Instrument Frequency Of Periodic Interest Payment			interest is payable semi-annually	interest is payable semi-annually
Percentage of principal amount of debt redeemed							100.00%	100.00%
Debt instrument, date of first required payment			Jun. 15, 2021	Jun. 15, 2021
Debt instrument, payment terms			June 15 and December 15 of each year, beginning on June 15, 2021	June 15 and December 15 of each year, beginning on June 15, 2021
Proceeds from Debt, Net ofunderwriting discounts and offering expenses			$ 884	¥ 5,800
Payment of underwriting discounts and offering expenses			16	¥ 103
Grosss Proceeds from issuance of debt		$ 100	900
Additional Debt Principal Amount Offered			100
Debt Instrument Convertible Conversion Ratio Basis Amount			$ 1,000
IQIYI 2026 Convertible Notes \| ADR [Member] \| Prior To June 15 2026 Debt Conversion Condition One [Member]
Debt Instrument [Line Items]
Debt Instrument, convertible, conversion price \| $ / shares			$ 22.31
Debt Instrument, convertible, threshold trading days \| Day			20	20
Debt instrument, convertible, threshold consecutive trading days \| Day			30	30
Debt instrument convertible threshold percentage of stock price trigger			130.00%	130.00%
IQIYI 2026 Convertible Notes \| ADR [Member] \| Prior To June 15 2026 Debt Conversion Condition Two [Member]
Debt Instrument [Line Items]
Debt Instrument, convertible, threshold trading days \| Day			5	5
Debt instrument, convertible, threshold consecutive trading days \| Day			10	10
Debt instrument convertible threshold percentage of stock price trigger			98.00%	98.00%
2023, 2025 and 2026 Convertible Notes Collectively [Member] \| Debt Default Event Trigger for Delay in Payment Discharge of a Final Judgment [Member]
Debt Instrument [Line Items]
Debt Instrument minimum debt default amount	$ 60						$ 60
2023, 2025 and 2026 Convertible Notes Collectively [Member] \| Debt Default Event Trigger for Involuntary Case or Other Proceeding [Member]
Debt Instrument [Line Items]
Number of concecutive days for which involuntary case or other proceeding shall remain undismissed and unstayed	30 days
2023, 2025 and 2026 Convertible Notes Collectively [Member] \| Debt Default Event Trigger for Default To Pay Interest [Member]
Debt Instrument [Line Items]
Debt default event trigger interest default period from due date							30 days	30 days
2023, 2025 and 2026 Convertible Notes Collectively [Member] \| Debt Default Event Trigger for Failure to Enforce Holder Conversion Rights [Member]
Debt Instrument [Line Items]
Number of business days In which holders Debt conversion right to be enforced							5 days	5 days
2023, 2025 and 2026 Convertible Notes Collectively [Member] \| Debt Default Event Trigger for Failure to Issue Fundamental Change Company Notice or Make Whole Fundamental Change [Member]
Debt Instrument [Line Items]
Number of Business days In which fundamental change company notice or make whole fundamental change to be issued							5 days	5 days
2023, 2025 and 2026 Convertible Notes Collectively [Member] \| Debt Default Event Trigger for Failure to Attend Trustee Notice [Member]
Debt Instrument [Line Items]
Minimum percentage of aggregate principal holding by holders	25.00%						25.00%				25.00%
Maximum period allowed to attend written Notice from trustee or by the trustee at the request of the holders							60 days	60 days
2023, 2025 and 2026 Convertible Notes Collectively [Member] \| Debt Default Event Trigger Default to Debt Under Mortgage Agreement or Other Instrument [Member]
Debt Instrument [Line Items]
Debt Instrument minimum debt default amount	$ 60						$ 60
Period In which indebtedness to be cured or discharged							30 days	30 days