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Notes Payable - Additional Information (Detail)	12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended					12 Months Ended
	Dec. 31, 2014 Unsecured Senior Notes Due Two Thousand Seventeen	Nov. 28, 2012 Unsecured Senior Notes Due Two Thousand Seventeen USD ($)	Dec. 31, 2014 Unsecured Senior Notes Due Two Thousand Twenty Two	Nov. 28, 2012 Unsecured Senior Notes Due Two Thousand Twenty Two USD ($)	Dec. 31, 2014 Unsecured Senior Notes Due Twenty Eighteen	Aug. 06, 2013 Unsecured Senior Notes Due Twenty Eighteen USD ($)	Dec. 31, 2014 Unsecured Senior Notes USD ($)	Dec. 31, 2014 Unsecured Senior Notes CNY	Dec. 31, 2013 Unsecured Senior Notes CNY	Dec. 31, 2012 Unsecured Senior Notes CNY	Nov. 28, 2012 Unsecured Senior Notes Tranche	Dec. 31, 2014 Unsecured Senior Notes Due Twenty Nineteen	Jun. 09, 2014 Unsecured Senior Notes Due Twenty Nineteen USD ($)
Debt Instrument [Line Items]
Number of tranches issued and sold											2bidu_NumberOfTranchesOfDebtIssued / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember
Debt face amount		$ 750,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwoThousandSeventeenMember		$ 750,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwoThousandTwentyTwoMember		$ 1,000,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwentyEighteenMember							$ 1,000,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwentyNineteenMember
Debt, maturity date	Nov. 28, 2017		Nov. 28, 2022		Aug. 06, 2018							Jun. 09, 2019
Interest rate	2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwoThousandSeventeenMember		3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwoThousandTwentyTwoMember		3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwentyEighteenMember							2.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwentyNineteenMember
Net proceeds from issuance of debt							990,000,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember	6,190,000,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember	6,110,000,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember	9,330,000,000us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember
Discount on debt issued							10,130,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember	62,840,000us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember
Debt issuance cost							$ 17,670,000us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember	109,630,000us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesMember
Effective interest rate	2.36%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwoThousandSeventeenMember		3.59%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwoThousandTwentyTwoMember		3.39%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwentyEighteenMember							3.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = bidu_UnsecuredSeniorNotesDueTwentyNineteenMember

X

- Definition

The number of tranches for the debt issued by the Company.

+ References

No definition available.

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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- Definition

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

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- Definition

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

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- Definition

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

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

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- Definition

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

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