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Schedule of Unrealized and Realized Gains and Losses of Equity Securities Without Readily Determinable Fair Values (Parenthetical) (Detail) - 6 months ended Jun. 30, 2020 ¥ in Millions, $ in Millions | CNY (¥) | USD ($)
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Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract] |  |
Equity securities gross unrealised loss excluding impairment | ¥ 100 | $ 14
Remeasurement loss of previously held equity interest in business combination held in stages | ¥ 278 | $ 39

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- Definition Equity securities gross unrealised loss excluding impairment. + References No definition available. + Details
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Namespace Prefix: | bidu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition In a business combination achieved in stages, this element represents the amount of loss recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References No definition available. + Details
Name: | us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration