0.000000625P10YP2YP4Y0.0000006250.0000006250.0000006250.000000625falseFYtrue0001329099E9E9Baidu Campus No. 10 Shangdi 10th StreetBaidu Campus No. 10 Shangdi 10th Street0.0000006250.0000006250.0000006250.0000006250.000000625Par value per share and the number of shares as of December 31, 2019 and 2020 have been retrospectively adjusted for the Share Subdivision and the ADS Ratio Change that became effective on March 1, 2021 as detailed in Note 1 and Note 21.Basic and diluted earnings per share and the number of shares for the years ended December 31, 2018, 2019 and 2020 have been retrospectively adjusted for the Share Subdivision and the ADS Ratio Change that were effective on March 1, 2021 as detailed in Note 1 and Note 21.The financial services business (“Du Xiaoman”) was disposed in the year of 2018. Please see Note 4 for further information.The number of shares has been retrospectively adjusted for the Share Subdivision and the ADS Ratio Change that became effective on March 1, 2021 as detailed in Note 1 and Note 21.Gross unrealized losses (downward adjustments excluding impairment) were RMB2.4 billion, RMB863 million and RMB378 million (US$58 million) for the years ended December 31, 2018, 2019 and 2020, respectively.The Company adopted a one-quarter lag in reporting its share of equity income (loss) in Trip.Trip adopted ASC 606, on a fully retrospective basis, and ASC 321 (collectively “new standards”) from January 1, 2018. The impact of the new standards on the Company’s financial statements was immaterial, and prior period financial information of Trip was not restated.The Company adopted a one-quarter lag in reporting its share of losses in all of its equity investees.(i) Disposition during the year ended December 31, 2019 was primarily related to the disposal of a subsidiary (Note 4).The allowance for credit losses on contract assets was RMB7 million and RMB27 million (US$4 million) as of December 31, 2019 and December 31, 2020, respectively. The amounts charged to expenses for credit losses of contract assets and write-offs charged against the allowance were RMB9 million (US$1 million) and nil, respectively, for the year ended December 31, 2020. The effect of adopting ASU 2016-13 was RMB11 million (US$2 million ) to the opening balance of contract assets, net.Effect of preferential tax rates inside the PRC on basic earnings per Class A and Class B ordinary share for the years ended December 31, 2018, 2019 and 2020 have been retrospectively adjusted for the Share Subdivision and the ADS Ratio Change that became effective on March 1, 2021, as detailed in Note 1 and Note 21* Adjustment of net unrealized gains related to available-for-sale equity investments from accumulated other comprehensive income to opening retained earnings as a result of the adoption of ASU 2016-13 on January 1, 2018.Basic and diluted net income per ordinary share, weighted average number of shares and the adjustments for dilutive restricted share and share options for the years ended December 31, 2018, 2019 and 2020 have been retrospectively adjusted for the Share Subdivision and the ADS Ratio Change that became effective on March 1, 2021, as detailed in Note 1The number of share options and weighted average exercise price has been retrospectively adjusted for the Share Subdivision that became effective on March 1, 2021 as detailed in Note 1 and Note 21.The number of restricted shares and weighted average grant date fair value has been retrospectively adjusted for the Share Subdivision that became effective on March 1, 2021 as detailed in Note 1 and Note 21.The balances mainly represent amounts arising from services the Company provided to Trip. The balances represent non-trade long-term loans due from Du Xiaoman with interest rates ranging from 0.00% to 0.50% in 2020, and amounts arising from services the Company provided to Du Xiaoman. The balance mainly represents a non-trade interest-bearing loan provided to Investee A, which was an equity investee as of December 31, 2019. The Company acquired Investee A on July 16, 2020, and accordingly, all corresponding outstanding balance has been eliminated in the consolidated balance sheet. The balances mainly represent amounts arising from services including online marketing services and cloud services the Company provided to Investee C. The balances mainly represent amounts arising from services the Company provided to its investees in ordinary course of business. The balance consists of amount due from the Company’s investees in the ordinary course of business. The balances mainly represent amounts arising from services provided by Trip. The balance represents amount due to Du Xiaoman arising from services provided by Du Xiaoman to the Company in the ordinary course of business and non-trade loans provided by Du Xiaoman with interest rates of nil in 2020. The balances mainly represent amounts arising from hardware products purchased from Investee A, and a non-trade interest-bearing loan provided by the Investee A, as of December 31, 2019. The Company acquired Investee A on July 16, 2020, and accordingly, all corresponding outstanding balances have been eliminated in the consolidated balance sheet. The balances mainly represent deferred revenue relating to the future services to be provided by the Company to Investee B which is an equity method investee. The balances mainly represent amounts arising from services including advertising services and licensing of content assets provided by the Company’s investees and non-trade amounts payable for acquiring the equity interest of the Company’s investees. The balances mainly represent non-trade interest-free long-term loans provided by Du Xiaoman. The balance represents mainly deferred revenue relating to the future services to be provided by the Company to investees. Due to factors such as the outbreak of coronavirus (COVID-19) resulting in declined financial performances and changes in business circumstances of certain investees, the Company recognized impairment charges of long-term investments as of March 31, 2020 June 30, 2020 and December 31, 2020. For equity securities accounted for under the measurement alternative, when there are observable price changes in orderly transactions for identical or similar investments of the same issuer, the investments are re-measured to fair value. The Company also recognized impairment loss on intangible assets as of March 31, 2020. The outbreak of COVID-19 during the first quarter of 2020 also has resulted in a downward adjustment to forecasted advertising revenues for the Mainland China film group. As a result, the Company performed an assessment to determine whether the fair value of the Mainland China film group was less than its unamortized film costs as of March 31, 2020 with the assistance of a third-party valuation firm. The Company uses a discounted cash flow approach to estimate the fair value. The Company estimated the most likely future cash flows based on historical results, economic useful lives or license periods and perception of future performance. The Company has incorporated those cash outflows necessary to generate the cash inflows, including future production, operation, exploitation and administrative costs, which were estimated at 32%-37% of revenue in aggregate. The discount rate was determined to be the weighted average cost of capital of the Mainland China film group at 15%. As of March 31, 2020, the fair value of the Mainland China film group was less than its corresponding carrying value and resulted in the Company recognizing an impairment charge of RMB390 million (US$60 million) related to licensed copyrights and RMB210 million (US$32 million) related to produced content, respectively. The impairment charge was recognized as cost of revenues in the condensed consolidated statement of comprehensive income for the year ended December 31, 2020. In addition, due to adverse changes in the expected performance of certain produced content and the reduced amount of ultimate revenue expected to be recognized, an impairment charge of RMB205 million (US$31 million) was recognized for produced content predominantly monetized on its own and was recognized as cost of revenues in the consolidated statement of comprehensive income for the year ended December 31, 2020. Investee C is one of the Company’ investees, over which the Company has significant influence. The revenues were presented as “Others” in the consolidated statements of comprehensive income (loss)The revenues were presented as “Online Marketing Revenue” in the consolidated statements of comprehensive income (loss) 0001329099 2018-01-01 2018-12-31 0001329099 2019-01-01 2019-12-31 0001329099 2020-01-01 2020-12-31 0001329099 2019-12-31 0001329099 2020-12-31 0001329099 2018-12-31 0001329099 2018-06-27 0001329099 2019-05-16 0001329099 2018-06-27 2018-06-27 0001329099 2020-01-01 2020-03-31 0001329099 2021-03-01 0001329099 2017-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-12-31 0001329099 bidu:TripComMember 2019-12-31 0001329099 bidu:OtherEquityMethodInvesteesExcludingCtripComMember 2019-12-31 0001329099 us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember 2019-12-31 0001329099 bidu:TripMember 2019-12-31 0001329099 bidu:DuXiaomanMember 2019-12-31 0001329099 bidu:InvesteeAMember 2019-12-31 0001329099 bidu:InvesteeCMember 2019-12-31 0001329099 bidu:OtherRelatedPartiesMember 2019-12-31 0001329099 us-gaap:ObligationsMember 2019-12-31 0001329099 bidu:OnlinePaymentAgenciesMember 2019-12-31 0001329099 bidu:InvesteeBMember 2019-12-31 0001329099 us-gaap:CommonClassAMember 2019-12-31 0001329099 us-gaap:CommonClassBMember 2019-12-31 0001329099 us-gaap:ShortTermInvestmentsMember us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001329099 us-gaap:ConstructionInProgressMember 2019-12-31 0001329099 us-gaap:LeaseholdImprovementsMember 2019-12-31 0001329099 us-gaap:OfficeEquipmentMember 2019-12-31 0001329099 us-gaap:VehiclesMember 2019-12-31 0001329099 us-gaap:BuildingImprovementsMember 2019-12-31 0001329099 us-gaap:BuildingMember 2019-12-31 0001329099 us-gaap:ComputerEquipmentMember 2019-12-31 0001329099 us-gaap:TechnologyBasedIntangibleAssetsMember 2019-12-31 0001329099 us-gaap:OtherIntangibleAssetsMember 2019-12-31 0001329099 bidu:OnlineLiteratureMember 2019-12-31 0001329099 us-gaap:IntellectualPropertyMember 2019-12-31 0001329099 us-gaap:TrademarksMember 2019-12-31 0001329099 us-gaap:CashEquivalentsMember 2019-12-31 0001329099 us-gaap:CashEquivalentsMember us-gaap:FairValueInputsLevel2Member 2019-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001329099 bidu:iQIYIMember bidu:OtherLoansMember 2019-12-31 0001329099 bidu:AgroupOf21ArrangersMember bidu:JpmorganMember 2019-12-31 0001329099 us-gaap:CashEquivalentsMember us-gaap:FairValueInputsLevel1Member 2019-12-31 0001329099 us-gaap:ShortTermInvestmentsMember 2019-12-31 0001329099 us-gaap:ShortTermInvestmentsMember us-gaap:FairValueInputsLevel2Member 2019-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember 2019-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:FairValueInputsLevel2Member 2019-12-31 0001329099 us-gaap:FairValueInputsLevel2Member 2019-12-31 0001329099 us-gaap:OtherCurrentAssetsMember 2019-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember bidu:ThirdPartyMember 2019-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:FairValueInputsLevel1Member 2019-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:CommonStockMember 2019-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0001329099 us-gaap:OtherNoncurrentAssetsMember 2019-12-31 0001329099 us-gaap:OtherNoncurrentAssetsMember us-gaap:FairValueInputsLevel2Member 2019-12-31 0001329099 us-gaap:FairValueInputsLevel1Member 2019-12-31 0001329099 us-gaap:FairValueInputsLevel3Member 2019-12-31 0001329099 srt:ParentCompanyMember 2019-12-31 0001329099 bidu:TwoThousandAndTenStockIncentivePlanMember bidu:iQIYIMember 2019-12-31 0001329099 us-gaap:FairValueInputsLevel3Member us-gaap:AccountsPayableAndAccruedLiabilitiesMember 2019-12-31 0001329099 us-gaap:AccountsPayableAndAccruedLiabilitiesMember 2019-12-31 0001329099 bidu:AmountsDueToRelatedPartiesNoncurrentMember 2019-12-31 0001329099 bidu:AmountsDueToRelatedPartiesNoncurrentMember us-gaap:FairValueInputsLevel2Member 2019-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember bidu:AmountsDueToTheCompanyAndItsNonVieSubsidiariesNetMember 2019-12-31 0001329099 bidu:iQIYIMember 2019-12-31 0001329099 bidu:JPMorganChaseBankNAMember us-gaap:HeldtomaturitySecuritiesMember 2019-12-31 0001329099 bidu:LongTermInvestmentsMember 2019-12-31 0001329099 us-gaap:FairValueInputsLevel1Member bidu:LongTermInvestmentsMember 2019-12-31 0001329099 bidu:LongTermInvestmentsMember us-gaap:FairValueInputsLevel2Member 2019-12-31 0001329099 us-gaap:FairValueInputsLevel3Member bidu:LongTermInvestmentsMember 2019-12-31 0001329099 us-gaap:FiniteLivedIntangibleAssetsMember 2019-12-31 0001329099 us-gaap:FiniteLivedIntangibleAssetsMember us-gaap:FairValueInputsLevel3Member 2019-12-31 0001329099 bidu:SublicensingRightsMember 2019-12-31 0001329099 bidu:BroadcastingRightsMember 2019-12-31 0001329099 bidu:LongTermInvestmentsMember us-gaap:CorporateDebtSecuritiesMember 2019-12-31 0001329099 bidu:BusinessCombinationsTwoThousandAndNineteenMember 2019-12-31 0001329099 bidu:DeferredRevenueMember 2019-12-31 0001329099 bidu:LongTermInvestmentsMember 2019-12-31 0001329099 bidu:LqiyiTwoThousandTwentyThreeConvertibleNotesAndTwoThousandTwentyFiveConvertibleNotesAndTwoThousandTwentySixConvertibleNotesCollectivelyMember 2019-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2020-12-31 0001329099 bidu:BaiduNetcomMember 2020-12-31 0001329099 bidu:BeijingPerusalMember 2020-12-31 0001329099 bidu:TripComMember 2020-12-31 0001329099 bidu:OtherEquityMethodInvesteesExcludingCtripComMember 2020-12-31 0001329099 bidu:TwoThousandsTwentyFourNotesIssuedOnNovember2018Member 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyFiveFiveYearNotesMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandThirtyAprilMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyTwoTenYearNotesMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwentyNineteenMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyFiveTenYearNotesMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyTwoFiveYearNotesMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentySevenMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyThreeMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyEightMarchMember 2020-12-31 0001329099 bidu:TwoThousandsTwentyFourNotesIssuedOnDecember2018Member 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyEightNovemberMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentySixMember 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandThirtyOctoberMember 2020-12-31 0001329099 bidu:IqiyiTwoThousandTwentySixConvertibleNotesMember 2020-12-31 0001329099 bidu:NetworkInfrastructureAndBuildingsMember 2020-12-31 0001329099 us-gaap:CommonClassAMember 2020-12-31 0001329099 us-gaap:CommonClassBMember 2020-12-31 0001329099 srt:ScenarioPreviouslyReportedMember 2020-12-31 0001329099 srt:ScenarioPreviouslyReportedMember us-gaap:CommonClassAMember 2020-12-31 0001329099 srt:ScenarioPreviouslyReportedMember us-gaap:CommonClassBMember 2020-12-31 0001329099 bidu:iQIYIMember bidu:TwoThousandAndTenStockIncentivePlanMember 2020-12-31 0001329099 bidu:iQIYIMember 2020-12-31 0001329099 bidu:FactoringArrangementsMember 2020-12-31 0001329099 us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember 2020-12-31 0001329099 bidu:DuXiaomanMember bidu:ServiceProvidersMember srt:MinimumMember 2020-12-31 0001329099 bidu:DuXiaomanMember bidu:ServiceProvidersMember srt:MaximumMember 2020-12-31 0001329099 srt:ParentCompanyMember 2020-12-31 0001329099 bidu:TripMember 2020-12-31 0001329099 bidu:DuXiaomanMember 2020-12-31 0001329099 bidu:InvesteeCMember 2020-12-31 0001329099 bidu:OtherRelatedPartiesMember 2020-12-31 0001329099 us-gaap:CopyrightsMember 2020-12-31 0001329099 us-gaap:LongTermDebtMember 2020-12-31 0001329099 us-gaap:ObligationsMember 2020-12-31 0001329099 bidu:OutstandingNotesMember 2020-12-31 0001329099 bidu:OnlinePaymentAgenciesMember 2020-12-31 0001329099 us-gaap:PreferredStockMember srt:ScenarioPreviouslyReportedMember 2020-12-31 0001329099 us-gaap:PreferredStockMember 2020-12-31 0001329099 bidu:InvesteeBMember 2020-12-31 0001329099 srt:ParentCompanyMember bidu:EmployeeHoldingMoreThanTenPercentVotingPowerMember srt:MinimumMember 2020-12-31 0001329099 us-gaap:ShortTermInvestmentsMember us-gaap:CorporateDebtSecuritiesMember 2020-12-31 0001329099 us-gaap:ConstructionInProgressMember 2020-12-31 0001329099 us-gaap:LeaseholdImprovementsMember 2020-12-31 0001329099 us-gaap:OfficeEquipmentMember 2020-12-31 0001329099 us-gaap:VehiclesMember 2020-12-31 0001329099 us-gaap:BuildingImprovementsMember 2020-12-31 0001329099 us-gaap:BuildingMember 2020-12-31 0001329099 us-gaap:ComputerEquipmentMember 2020-12-31 0001329099 us-gaap:OtherIntangibleAssetsMember 2020-12-31 0001329099 bidu:OnlineLiteratureMember 2020-12-31 0001329099 us-gaap:IntellectualPropertyMember 2020-12-31 0001329099 us-gaap:TechnologyBasedIntangibleAssetsMember 2020-12-31 0001329099 us-gaap:TrademarksMember 2020-12-31 0001329099 us-gaap:BuildingAndBuildingImprovementsMember 2020-12-31 0001329099 us-gaap:EmployeeStockOptionMember srt:ParentCompanyMember 2020-12-31 0001329099 srt:ParentCompanyMember us-gaap:RestrictedStockMember 2020-12-31 0001329099 bidu:TwentyTwentySharesRepurchaseProgramMember 2020-12-31 0001329099 us-gaap:CashEquivalentsMember 2020-12-31 0001329099 us-gaap:CashEquivalentsMember us-gaap:FairValueInputsLevel2Member 2020-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:CorporateDebtSecuritiesMember 2020-12-31 0001329099 bidu:OtherLoansMember bidu:iQIYIMember 2020-12-31 0001329099 bidu:AgroupOf21ArrangersMember bidu:JpmorganMember 2020-12-31 0001329099 us-gaap:CashEquivalentsMember us-gaap:FairValueInputsLevel1Member 2020-12-31 0001329099 us-gaap:ShortTermInvestmentsMember 2020-12-31 0001329099 us-gaap:ShortTermInvestmentsMember us-gaap:FairValueInputsLevel2Member 2020-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember 2020-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:FairValueInputsLevel2Member 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyFourNotesMember bidu:TwoThousandsTwentyFourNotesIssuedOnNovember2018Member 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyFourMember bidu:TwoThousandsTwentyFourNotesIssuedOnDecember2018Member 2020-12-31 0001329099 us-gaap:FairValueInputsLevel2Member 2020-12-31 0001329099 us-gaap:OtherCurrentAssetsMember 2020-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember bidu:ThirdPartyMember 2020-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:FairValueInputsLevel1Member 2020-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:CommonStockMember 2020-12-31 0001329099 us-gaap:OtherLongTermInvestmentsMember us-gaap:FairValueInputsLevel3Member 2020-12-31 0001329099 us-gaap:FairValueInputsLevel1Member 2020-12-31 0001329099 us-gaap:FairValueInputsLevel3Member 2020-12-31 0001329099 us-gaap:AccountsPayableAndAccruedLiabilitiesMember 2020-12-31 0001329099 us-gaap:AccountsPayableAndAccruedLiabilitiesMember us-gaap:FairValueInputsLevel2Member 2020-12-31 0001329099 bidu:AmountsDueToRelatedPartiesCurrentMember 2020-12-31 0001329099 bidu:AmountsDueToRelatedPartiesCurrentMember us-gaap:FairValueInputsLevel2Member 2020-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember bidu:AmountsDueToTheCompanyAndItsNonVieSubsidiariesNetMember 2020-12-31 0001329099 bidu:iQIYITwoThousandTwentyThreeConvertibleNotesMember 2020-12-31 0001329099 bidu:IqiyiTwoThousandTwentyFiveConvertibleNotesMember 2020-12-31 0001329099 bidu:JPMorganChaseBankNAMember us-gaap:HeldtomaturitySecuritiesMember 2020-12-31 0001329099 us-gaap:FairValueInputsLevel1Member bidu:LongTermInvestmentsMember 2020-12-31 0001329099 bidu:LongTermInvestmentsMember 2020-12-31 0001329099 us-gaap:FairValueInputsLevel3Member bidu:LongTermInvestmentsMember 2020-12-31 0001329099 us-gaap:FiniteLivedIntangibleAssetsMember 2020-12-31 0001329099 us-gaap:FiniteLivedIntangibleAssetsMember us-gaap:FairValueInputsLevel3Member 2020-12-31 0001329099 bidu:SublicensingRightsMember 2020-12-31 0001329099 bidu:BroadcastingRightsMember 2020-12-31 0001329099 bidu:LongTermInvestmentsMember us-gaap:CorporateDebtSecuritiesMember 2020-12-31 0001329099 bidu:BusinessCombinationsTwoThousandAndNineteenMember 2020-12-31 0001329099 bidu:ReleasedLessAmortizationAndImpairmentMember 2020-12-31 0001329099 bidu:InProductionLessImpairmentMember 2020-12-31 0001329099 bidu:InDevelopmentLessImpairmentMember 2020-12-31 0001329099 bidu:DeferredRevenueMember 2020-12-31 0001329099 bidu:LongTermInvestmentsMember 2020-12-31 0001329099 bidu:FactoringArrangementsMember bidu:iQIYIMember 2020-12-31 0001329099 bidu:LqiyiTwoThousandTwentyThreeConvertibleNotesAndTwoThousandTwentyFiveConvertibleNotesAndTwoThousandTwentySixConvertibleNotesCollectivelyMember 2020-12-31 0001329099 us-gaap:AssetBackedSecuritiesMember srt:MinimumMember 2020-12-31 0001329099 us-gaap:AssetBackedSecuritiesMember srt:MaximumMember 2020-12-31 0001329099 bidu:ProducedContentMember 2020-12-31 0001329099 us-gaap:FairValueInputsLevel3Member bidu:ProducedContentMember 2020-12-31 0001329099 us-gaap:CommonClassAMember 2018-01-01 2018-12-31 0001329099 us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember 2018-01-01 2018-12-31 0001329099 us-gaap:ShortTermInvestmentsMember 2018-01-01 2018-12-31 0001329099 bidu:BaiduJapanMember 2018-01-01 2018-12-31 0001329099 us-gaap:CommonClassBMember 2018-01-01 2018-12-31 0001329099 us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2018-01-01 2018-12-31 0001329099 us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2018-01-01 2018-12-31 0001329099 us-gaap:IntersegmentEliminationMember 2018-01-01 2018-12-31 0001329099 us-gaap:CostOfSalesMember 2018-01-01 2018-12-31 0001329099 us-gaap:SellingGeneralAndAdministrativeExpensesMember 2018-01-01 2018-12-31 0001329099 us-gaap:ResearchAndDevelopmentExpenseMember 2018-01-01 2018-12-31 0001329099 bidu:iQIYIMember us-gaap:CostOfSalesMember 2018-01-01 2018-12-31 0001329099 bidu:iQIYIMember us-gaap:SellingGeneralAndAdministrativeExpensesMember 2018-01-01 2018-12-31 0001329099 bidu:iQIYIMember us-gaap:ResearchAndDevelopmentExpenseMember 2018-01-01 2018-12-31 0001329099 bidu:iQIYIMember 2018-01-01 2018-12-31 0001329099 srt:ParentCompanyMember 2018-01-01 2018-12-31 0001329099 bidu:KeySoftwareEnterpriseMember bidu:BaiduInternationalMember 2018-01-01 2018-12-31 0001329099 bidu:CertainPrcSubsidiariesAndViesMember bidu:HighAndNewTechnologyEnterpriseMember 2018-01-01 2018-12-31 0001329099 bidu:AmericanDepositaryShareMember us-gaap:CommonClassAMember 2018-01-01 2018-12-31 0001329099 bidu:OtherEquityMethodInvesteesExcludingCtripComMember 2018-01-01 2018-12-31 0001329099 bidu:TripComMember 2018-01-01 2018-12-31 0001329099 us-gaap:AccumulatedTranslationAdjustmentMember 2018-01-01 2018-12-31 0001329099 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-01-01 2018-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-12-31 0001329099 srt:ParentCompanyMember us-gaap:EmployeeStockOptionMember 2018-01-01 2018-12-31 0001329099 us-gaap:CommonStockMember 2018-01-01 2018-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember 2018-01-01 2018-12-31 0001329099 us-gaap:RetainedEarningsMember 2018-01-01 2018-12-31 0001329099 us-gaap:NoncontrollingInterestMember 2018-01-01 2018-12-31 0001329099 bidu:OtherLoansMember srt:MinimumMember 2018-01-01 2018-12-31 0001329099 bidu:OtherLoansMember srt:MaximumMember 2018-01-01 2018-12-31 0001329099 bidu:iQIYILicensedCopyrightMember 2018-01-01 2018-12-31 0001329099 srt:ScenarioPreviouslyReportedMember 2018-01-01 2018-12-31 0001329099 srt:ParentCompanyMember us-gaap:RestrictedStockMember 2018-01-01 2018-12-31 0001329099 bidu:CommonClassAAndClassBMember 2018-01-01 2018-12-31 0001329099 us-gaap:CommonClassAMember bidu:AmericanDepositaryShareMember 2018-01-01 2018-12-31 0001329099 us-gaap:ProductAndServiceOtherMember 2018-01-01 2018-12-31 0001329099 bidu:OnlineMarketingServicesMember 2018-01-01 2018-12-31 0001329099 bidu:OtherLoansMember bidu:iQIYIMember bidu:TwoThousandsEighteenFactoredReceivablesMember 2018-01-01 2018-12-31 0001329099 srt:ParentCompanyMember srt:MaximumMember 2018-01-01 2018-12-31 0001329099 srt:ParentCompanyMember srt:MinimumMember 2018-01-01 2018-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-01-01 2018-12-31 0001329099 bidu:LicensedCopyrightsMember 2018-01-01 2018-12-31 0001329099 bidu:TripMember 2018-01-01 2018-12-31 0001329099 bidu:DuXiaomanMember 2018-01-01 2018-12-31 0001329099 bidu:InvesteeCMember 2018-01-01 2018-12-31 0001329099 bidu:OtherRelatedPartiesMember 2018-01-01 2018-12-31 0001329099 bidu:ProducedContentNetMember 2018-01-01 2018-12-31 0001329099 bidu:LongTermInvestmentsMember 2018-01-01 2018-12-31 0001329099 bidu:OnlineMarketingServicesMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2018-01-01 2018-12-31 0001329099 bidu:OtherRevenueAiCloudMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2018-01-01 2018-12-31 0001329099 bidu:OtherRevenueInterestIncomeEarnedFromProvisionOfFinancialServicesMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2018-01-01 2018-12-31 0001329099 us-gaap:ProductAndServiceOtherMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2018-01-01 2018-12-31 0001329099 us-gaap:MembershipMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2018-01-01 2018-12-31 0001329099 bidu:OnlineAdvertisingServiceMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2018-01-01 2018-12-31 0001329099 bidu:OtherRevenueContentDistributionMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2018-01-01 2018-12-31 0001329099 bidu:OtherRevenueOtherMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2018-01-01 2018-12-31 0001329099 bidu:SeniorConvertibleNotesMember 2018-01-01 2018-12-31 0001329099 us-gaap:CommonClassAMember 2019-01-01 2019-12-31 0001329099 us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember 2019-01-01 2019-12-31 0001329099 us-gaap:ShortTermInvestmentsMember 2019-01-01 2019-12-31 0001329099 bidu:BaiduJapanMember 2019-01-01 2019-12-31 0001329099 us-gaap:CommonClassBMember 2019-01-01 2019-12-31 0001329099 us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2019-01-01 2019-12-31 0001329099 us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2019-01-01 2019-12-31 0001329099 us-gaap:IntersegmentEliminationMember 2019-01-01 2019-12-31 0001329099 us-gaap:CostOfSalesMember 2019-01-01 2019-12-31 0001329099 us-gaap:SellingGeneralAndAdministrativeExpensesMember 2019-01-01 2019-12-31 0001329099 us-gaap:ResearchAndDevelopmentExpenseMember 2019-01-01 2019-12-31 0001329099 bidu:iQIYIMember us-gaap:CostOfSalesMember 2019-01-01 2019-12-31 0001329099 bidu:iQIYIMember us-gaap:SellingGeneralAndAdministrativeExpensesMember 2019-01-01 2019-12-31 0001329099 bidu:iQIYIMember us-gaap:ResearchAndDevelopmentExpenseMember 2019-01-01 2019-12-31 0001329099 bidu:iQIYIMember 2019-01-01 2019-12-31 0001329099 bidu:BaiduCoreBusinessMember 2019-01-01 2019-12-31 0001329099 srt:ParentCompanyMember 2019-01-01 2019-12-31 0001329099 bidu:HighAndNewTechnologyEnterpriseMember bidu:CertainPrcSubsidiariesAndViesMember 2019-01-01 2019-12-31 0001329099 bidu:BaiduInternationalMember bidu:KeySoftwareEnterpriseMember 2019-01-01 2019-12-31 0001329099 bidu:IqiyiTwoThousandTwentyFiveConvertibleNotesMember 2019-01-01 2019-12-31 0001329099 bidu:AmericanDepositaryShareMember us-gaap:CommonClassAMember 2019-01-01 2019-12-31 0001329099 bidu:OtherEquityMethodInvesteesExcludingCtripComMember 2019-01-01 2019-12-31 0001329099 bidu:TripComMember 2019-01-01 2019-12-31 0001329099 us-gaap:AccumulatedTranslationAdjustmentMember 2019-01-01 2019-12-31 0001329099 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-01-01 2019-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-12-31 0001329099 srt:ParentCompanyMember us-gaap:EmployeeStockOptionMember 2019-01-01 2019-12-31 0001329099 bidu:JPMorganChaseBankNAMember 2019-01-01 2019-12-31 0001329099 bidu:BankOfChinaShanghaiBranchMember bidu:iQIYIMember 2019-01-01 2019-12-31 0001329099 bidu:OtherLoansMember bidu:iQIYIMember 2019-01-01 2019-12-31 0001329099 us-gaap:CommonStockMember 2019-01-01 2019-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember 2019-01-01 2019-12-31 0001329099 us-gaap:RetainedEarningsMember 2019-01-01 2019-12-31 0001329099 us-gaap:NoncontrollingInterestMember 2019-01-01 2019-12-31 0001329099 bidu:iQIYILicensedCopyrightMember 2019-01-01 2019-12-31 0001329099 srt:ScenarioPreviouslyReportedMember 2019-01-01 2019-12-31 0001329099 srt:ParentCompanyMember us-gaap:RestrictedStockMember 2019-01-01 2019-12-31 0001329099 bidu:CommonClassAAndClassBMember 2019-01-01 2019-12-31 0001329099 us-gaap:CommonClassAMember bidu:AmericanDepositaryShareMember 2019-01-01 2019-12-31 0001329099 bidu:iQIYIMember bidu:TwoThousandAndTenStockIncentivePlanMember 2019-01-01 2019-12-31 0001329099 us-gaap:ProductAndServiceOtherMember 2019-01-01 2019-12-31 0001329099 bidu:OnlineMarketingServicesMember 2019-01-01 2019-12-31 0001329099 bidu:DuXiaomanFinancialMember 2019-01-01 2019-12-31 0001329099 bidu:OtherLoansMember bidu:iQIYIMember bidu:TwoThousandsNineteenFactoredReceivablesMember 2019-01-01 2019-12-31 0001329099 srt:ParentCompanyMember srt:MaximumMember 2019-01-01 2019-12-31 0001329099 srt:ParentCompanyMember srt:MinimumMember 2019-01-01 2019-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-01-01 2019-12-31 0001329099 bidu:InvestmentAccountedFairValueMember 2019-01-01 2019-12-31 0001329099 us-gaap:AvailableforsaleSecuritiesMember 2019-01-01 2019-12-31 0001329099 bidu:LicensedCopyrightsMember 2019-01-01 2019-12-31 0001329099 bidu:TripMember 2019-01-01 2019-12-31 0001329099 bidu:DuXiaomanMember 2019-01-01 2019-12-31 0001329099 bidu:InvesteeCMember 2019-01-01 2019-12-31 0001329099 bidu:OtherRelatedPartiesMember 2019-01-01 2019-12-31 0001329099 bidu:ProducedContentNetMember 2019-01-01 2019-12-31 0001329099 bidu:LongTermInvestmentsMember 2019-01-01 2019-12-31 0001329099 bidu:OnlineMarketingServicesMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2019-01-01 2019-12-31 0001329099 bidu:OtherRevenueAiCloudMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2019-01-01 2019-12-31 0001329099 us-gaap:ProductAndServiceOtherMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2019-01-01 2019-12-31 0001329099 us-gaap:MembershipMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2019-01-01 2019-12-31 0001329099 bidu:OnlineAdvertisingServiceMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2019-01-01 2019-12-31 0001329099 bidu:OtherRevenueContentDistributionMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2019-01-01 2019-12-31 0001329099 bidu:OtherRevenueOtherMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2019-01-01 2019-12-31 0001329099 bidu:SeniorConvertibleNotesMember 2019-01-01 2019-12-31 0001329099 bidu:LongTermInvestmentsMember 2019-01-01 2019-12-31 0001329099 us-gaap:FiniteLivedIntangibleAssetsMember 2019-01-01 2019-12-31 0001329099 us-gaap:CommonClassAMember 2020-01-01 2020-12-31 0001329099 us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember 2020-01-01 2020-12-31 0001329099 us-gaap:ShortTermInvestmentsMember 2020-01-01 2020-12-31 0001329099 bidu:BaiduHongKongMember 2020-01-01 2020-12-31 0001329099 bidu:BaiduJapanMember 2020-01-01 2020-12-31 0001329099 us-gaap:CommonClassBMember 2020-01-01 2020-12-31 0001329099 us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2020-01-01 2020-12-31 0001329099 us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 us-gaap:IntersegmentEliminationMember 2020-01-01 2020-12-31 0001329099 us-gaap:CostOfSalesMember 2020-01-01 2020-12-31 0001329099 us-gaap:SellingGeneralAndAdministrativeExpensesMember 2020-01-01 2020-12-31 0001329099 us-gaap:ResearchAndDevelopmentExpenseMember 2020-01-01 2020-12-31 0001329099 bidu:iQIYIMember us-gaap:CostOfSalesMember 2020-01-01 2020-12-31 0001329099 bidu:iQIYIMember us-gaap:SellingGeneralAndAdministrativeExpensesMember 2020-01-01 2020-12-31 0001329099 bidu:iQIYIMember us-gaap:ResearchAndDevelopmentExpenseMember 2020-01-01 2020-12-31 0001329099 bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 bidu:LongTermInvestmentsMember 2020-01-01 2020-12-31 0001329099 bidu:BaiduMember 2020-01-01 2020-12-31 0001329099 bidu:BaiduCoreBusinessMember 2020-01-01 2020-12-31 0001329099 bidu:OtherVieMember 2020-01-01 2020-12-31 0001329099 bidu:BeijingPerusalMember 2020-01-01 2020-12-31 0001329099 bidu:BaiduNetcomMember 2020-01-01 2020-12-31 0001329099 us-gaap:EquityMethodInvestmentsMember 2020-01-01 2020-12-31 0001329099 srt:ParentCompanyMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandThirtyOctoberMember 2020-01-01 2020-12-31 0001329099 bidu:TwoThousandsTwentyFourNotesIssuedOnNovember2018Member 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyThreeMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentySevenMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyFiveTenYearNotesMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwentyNineteenMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyTwoTenYearNotesMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandThirtyAprilMember 2020-01-01 2020-12-31 0001329099 bidu:TwoThousandsTwentyFourNotesIssuedOnDecember2018Member 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyEightNovemberMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyTwoFiveYearNotesMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyFiveFiveYearNotesMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentySixMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyEightMarchMember 2020-01-01 2020-12-31 0001329099 bidu:HighAndNewTechnologyEnterpriseMember 2020-01-01 2020-12-31 0001329099 bidu:KeySoftwareEnterpriseMember 2020-01-01 2020-12-31 0001329099 bidu:HighAndNewTechnologyEnterpriseMember bidu:CertainPrcSubsidiariesAndViesMember 2020-01-01 2020-12-31 0001329099 bidu:IqiyiTwoThousandTwentySixConvertibleNotesMember 2020-01-01 2020-12-31 0001329099 us-gaap:ObligationsMember 2020-01-01 2020-12-31 0001329099 srt:ParentCompanyMember bidu:TwoThousandAndEightStockIncentivePlanMember bidu:EmployeeHoldingNoMoreThanTenPercentVotingPowerMember srt:MaximumMember 2020-01-01 2020-12-31 0001329099 srt:MaximumMember bidu:EmployeeHoldingMoreThanTenPercentVotingPowerMember bidu:TwoThousandAndEightStockIncentivePlanMember srt:ParentCompanyMember 2020-01-01 2020-12-31 0001329099 bidu:OtherEquityMethodInvesteesExcludingCtripComMemberMember 2020-01-01 2020-12-31 0001329099 us-gaap:CashAndCashEquivalentsMember srt:MaximumMember 2020-01-01 2020-12-31 0001329099 srt:MaximumMember us-gaap:ShortTermInvestmentsMember 2020-01-01 2020-12-31 0001329099 bidu:iQIYITwoThousandTwentyThreeConvertibleNotesMember 2020-01-01 2020-12-31 0001329099 bidu:ExpirationPeriodTwoMember bidu:HighAndNewTechnologyEnterpriseMember bidu:CertainPrcSubsidiariesAndViesMember 2020-01-01 2020-12-31 0001329099 bidu:ExpirationPeriodThreeMember bidu:HighAndNewTechnologyEnterpriseMember bidu:CertainPrcSubsidiariesAndViesMember 2020-01-01 2020-12-31 0001329099 srt:ParentCompanyMember us-gaap:EmployeeStockOptionMember srt:MinimumMember 2020-01-01 2020-12-31 0001329099 bidu:TwoThousandAndTenStockIncentivePlanMember bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 srt:MaximumMember srt:ParentCompanyMember us-gaap:EmployeeStockOptionMember 2020-01-01 2020-12-31 0001329099 bidu:AmericanDepositaryShareMember us-gaap:CommonClassAMember 2020-01-01 2020-12-31 0001329099 bidu:OtherEquityMethodInvesteesExcludingCtripComMember 2020-01-01 2020-12-31 0001329099 bidu:TripComMember 2020-01-01 2020-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-01-01 2020-12-31 0001329099 us-gaap:AccumulatedTranslationAdjustmentMember 2020-01-01 2020-12-31 0001329099 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2020-01-01 2020-12-31 0001329099 us-gaap:BuildingMember srt:MinimumMember 2020-01-01 2020-12-31 0001329099 us-gaap:BuildingMember srt:MaximumMember 2020-01-01 2020-12-31 0001329099 us-gaap:BuildingImprovementsMember 2020-01-01 2020-12-31 0001329099 us-gaap:ComputerEquipmentMember srt:MinimumMember 2020-01-01 2020-12-31 0001329099 us-gaap:ComputerEquipmentMember srt:MaximumMember 2020-01-01 2020-12-31 0001329099 us-gaap:OfficeEquipmentMember srt:MinimumMember 2020-01-01 2020-12-31 0001329099 us-gaap:OfficeEquipmentMember srt:MaximumMember 2020-01-01 2020-12-31 0001329099 us-gaap:VehiclesMember 2020-01-01 2020-12-31 0001329099 us-gaap:LeaseholdImprovementsMember 2020-01-01 2020-12-31 0001329099 us-gaap:TrademarksMember 2020-01-01 2020-12-31 0001329099 us-gaap:TechnologyBasedIntangibleAssetsMember 2020-01-01 2020-12-31 0001329099 us-gaap:IntellectualPropertyMember 2020-01-01 2020-12-31 0001329099 bidu:OnlineLiteratureMember 2020-01-01 2020-12-31 0001329099 us-gaap:OtherIntangibleAssetsMember 2020-01-01 2020-12-31 0001329099 srt:ParentCompanyMember us-gaap:EmployeeStockOptionMember 2020-01-01 2020-12-31 0001329099 us-gaap:NationalTaxAgencyJapanMember 2020-01-01 2020-12-31 0001329099 us-gaap:StateAdministrationOfTaxationChinaMember 2020-01-01 2020-12-31 0001329099 bidu:BankOfChinaShanghaiBranchMember bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 bidu:JPMorganChaseBankNAMember 2020-01-01 2020-12-31 0001329099 bidu:OtherLoansMember bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 us-gaap:RestrictedStockMember srt:ParentCompanyMember 2020-01-01 2020-12-31 0001329099 us-gaap:CommonStockMember 2020-01-01 2020-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember 2020-01-01 2020-12-31 0001329099 us-gaap:RetainedEarningsMember 2020-01-01 2020-12-31 0001329099 us-gaap:NoncontrollingInterestMember 2020-01-01 2020-12-31 0001329099 bidu:iQIYILicensedCopyrightMember 2020-01-01 2020-12-31 0001329099 us-gaap:EarliestTaxYearMember us-gaap:StateAdministrationOfTaxationChinaMember 2020-01-01 2020-12-31 0001329099 us-gaap:LatestTaxYearMember us-gaap:StateAdministrationOfTaxationChinaMember 2020-01-01 2020-12-31 0001329099 srt:ScenarioPreviouslyReportedMember 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyFourMember bidu:TwoThousandsTwentyFourNotesIssuedOnDecember2018Member 2020-01-01 2020-12-31 0001329099 bidu:UnsecuredSeniorNotesDueTwoThousandTwentyFourNotesMember bidu:TwoThousandsTwentyFourNotesIssuedOnNovember2018Member 2020-01-01 2020-12-31 0001329099 bidu:ChinaUnitedNetworkCommunicationLimitedMember us-gaap:OtherAssetsMember 2020-01-01 2020-12-31 0001329099 bidu:CommonClassAAndClassBMember 2020-01-01 2020-12-31 0001329099 us-gaap:CommonClassAMember bidu:AmericanDepositaryShareMember 2020-01-01 2020-12-31 0001329099 bidu:OnshoreChinaMember bidu:FinancialInstrumentsMember us-gaap:CreditConcentrationRiskMember 2020-01-01 2020-12-31 0001329099 us-gaap:CreditConcentrationRiskMember bidu:OffshoreChinaMember bidu:FinancialInstrumentsMember 2020-01-01 2020-12-31 0001329099 bidu:OnshoreChinaMember us-gaap:CreditConcentrationRiskMember bidu:FinancialInstitutionOneMember 2020-01-01 2020-12-31 0001329099 bidu:OnshoreChinaMember us-gaap:CreditConcentrationRiskMember bidu:FinancialInstitutionTwoMember 2020-01-01 2020-12-31 0001329099 bidu:OnshoreChinaMember us-gaap:CreditConcentrationRiskMember bidu:FinancialInstitutionThreeMember 2020-01-01 2020-12-31 0001329099 bidu:OnshoreChinaMember us-gaap:CreditConcentrationRiskMember bidu:FinancialInstitutionFourMember 2020-01-01 2020-12-31 0001329099 srt:MaximumMember us-gaap:SalesRevenueNetMember us-gaap:CreditConcentrationRiskMember 2020-01-01 2020-12-31 0001329099 us-gaap:ProductAndServiceOtherMember 2020-01-01 2020-12-31 0001329099 bidu:OnlineMarketingServicesMember 2020-01-01 2020-12-31 0001329099 dei:AdrMember 2020-01-01 2020-12-31 0001329099 bidu:IqiyiTwoThousandTwentyFiveConvertibleNotesMember 2020-01-01 2020-12-31 0001329099 dei:BusinessContactMember 2020-01-01 2020-12-31 0001329099 srt:ParentCompanyMember srt:MaximumMember 2020-01-01 2020-12-31 0001329099 srt:ParentCompanyMember srt:MinimumMember 2020-01-01 2020-12-31 0001329099 bidu:TwoThousandAndTenStockIncentivePlanMember bidu:iQIYIMember bidu:FirstAnniversaryMember 2020-01-01 2020-12-31 0001329099 bidu:TwoThousandAndTenStockIncentivePlanMember bidu:iQIYIMember bidu:QuarterlyBasisThereafterMember 2020-01-01 2020-12-31 0001329099 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2020-01-01 2020-12-31 0001329099 bidu:BusinessCombinationsIn2020Member 2020-01-01 2020-12-31 0001329099 bidu:InvestmentAccountedFairValueMember 2020-01-01 2020-12-31 0001329099 us-gaap:AvailableforsaleSecuritiesMember 2020-01-01 2020-12-31 0001329099 bidu:DeferredRevenueMember 2020-01-01 2020-12-31 0001329099 bidu:ActiveDirectorsMember bidu:TripComMember 2020-01-01 2020-12-31 0001329099 us-gaap:AccountingStandardsUpdate201902Member bidu:LicensedCopyrightsAndProducedContentMember 2020-01-01 2020-12-31 0001329099 bidu:LicensedCopyrightsAndProducedContentMember bidu:ChangeInAccountingEstimateMember 2020-01-01 2020-12-31 0001329099 bidu:LicensedCopyrightsMember 2020-01-01 2020-12-31 0001329099 bidu:TripMember 2020-01-01 2020-12-31 0001329099 bidu:DuXiaomanMember 2020-01-01 2020-12-31 0001329099 bidu:InvesteeCMember 2020-01-01 2020-12-31 0001329099 bidu:OtherRelatedPartiesMember 2020-01-01 2020-12-31 0001329099 bidu:ProducedContentMember 2020-01-01 2020-12-31 0001329099 us-gaap:AccountingStandardsUpdate201613Member 2020-01-01 2020-12-31 0001329099 bidu:OnlineMarketingServicesMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2020-01-01 2020-12-31 0001329099 bidu:OtherRevenueAiCloudMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2020-01-01 2020-12-31 0001329099 us-gaap:ProductAndServiceOtherMember us-gaap:OperatingSegmentsMember bidu:BaiduCoreBusinessMember 2020-01-01 2020-12-31 0001329099 us-gaap:MembershipMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 bidu:OnlineAdvertisingServiceMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 bidu:OtherRevenueContentDistributionMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 bidu:OtherRevenueOtherMember us-gaap:OperatingSegmentsMember bidu:iQIYIMember 2020-01-01 2020-12-31 0001329099 bidu:MainLandChinaFilmGroupMember srt:MinimumMember 2020-01-01 2020-12-31 0001329099 bidu:MainLandChinaFilmGroupMember srt:MaximumMember 2020-01-01 2020-12-31 0001329099 bidu:MainLandChinaFilmGroupMember 2020-01-01 2020-12-31 0001329099 bidu:SeniorConvertibleNotesMember 2020-01-01 2020-12-31 0001329099 us-gaap:OperatingSegmentsMember 2020-01-01 2020-12-31 0001329099 bidu:LongTermInvestmentsMember 2020-01-01 2020-12-31 0001329099 us-gaap:FairValueMeasurementsNonrecurringMember 2020-01-01 2020-12-31 0001329099 us-gaap:FiniteLivedIntangibleAssetsMember 2020-01-01 2020-12-31 0001329099 bidu:CostOfRevenueMember 2020-01-01 2020-12-31 0001329099 us-gaap:AccountingStandardsUpdate201613Member 2020-01-01 0001329099 us-gaap:AccountingStandardsUpdate201601Member us-gaap:CommonStockMember 2018-01-01 0001329099 bidu:iQIYITwoThousandTwentyThreeConvertibleNotesMember 2018-12-31 0001329099 us-gaap:SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember 2018-12-31 0001329099 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0001329099 bidu:TripComMember 2018-12-31 0001329099 bidu:OtherLoansMember bidu:iQIYIMember bidu:TwoThousandsEighteenFactoredReceivablesMember 2018-12-31 0001329099 bidu:iQIYITwoThousandTwentyThreeConvertibleNotesMember us-gaap:CallOptionMember 2018-12-31 0001329099 bidu:TripComMember 2019-07-01 2019-09-30 0001329099 bidu:TripComMember 2019-10-01 2019-10-31 0001329099 bidu:DuXiaomanFinancialMember 2018-08-01 2018-08-31 0001329099 bidu:DuXiaomanFinancialMember 2018-08-31 0001329099 bidu:AgroupOf21ArrangersMember 2016-06-01 2016-06-30 0001329099 bidu:AgroupOf21ArrangersMember bidu:UnsecuredDebtOneMember 2016-06-01 2016-06-30 0001329099 bidu:AgroupOf21ArrangersMember bidu:UnsecuredDebtTwoMember 2016-06-01 2016-06-30 0001329099 bidu:AgroupOf21ArrangersMember bidu:UnsecuredDebtTwoMember 2016-06-30 0001329099 bidu:AgroupOf21ArrangersMember bidu:UnsecuredDebtOneMember 2016-06-30 0001329099 bidu:AgroupOf21ArrangersMember bidu:DebtInstrumentTrancheOneMember bidu:UnsecuredDebtOneMember 2016-06-30 0001329099 bidu:AgroupOf21ArrangersMember bidu:DebtInstrumentTrancheTwoMember bidu:UnsecuredDebtOneMember 2016-06-30 0001329099 bidu:UnsecuredDebtOneMember bidu:AgroupOf21ArrangersMember bidu:DebtInstrumentTrancheTwoMember 2016-11-30 0001329099 bidu:AgroupOf21ArrangersMember bidu:UnsecuredDebtOneMember bidu:DebtInstrumentTrancheOneMember 2016-11-30 0001329099 bidu:AgroupOf21ArrangersMember bidu:UnsecuredDebtTwoMember 2016-11-30 0001329099 bidu:BankOfChinaShanghaiBranchMember bidu:iQIYIMember 2017-04-01 2017-04-30 0001329099 bidu:BankOfChinaShanghaiBranchMember bidu:iQIYIMember 2017-04-30 0001329099 bidu:JPMorganChaseBankNAMember 2019-09-01 2019-09-30 0001329099 bidu:JPMorganChaseBankNAMember 2019-09-30 0001329099 bidu:TwoThousandsNineteenFactoredReceivablesMember bidu:iQIYIMember bidu:OtherLoansMember 2019-11-30 0001329099 bidu:iQIYITwoThousandTwentyThreeConvertibleNotesMember 2018-12-01 2018-12-31 0001329099 bidu:IqiyiTwoThousandTwentyFiveConvertibleNotesMember 2019-01-01 2019-03-31 0001329099 bidu:IqiyiTwoThousandTwentyFiveConvertibleNotesMember 2019-03-31 0001329099 bidu:IqiyiTwoThousandTwentyFiveConvertibleNotesMember us-gaap:CallOptionMember 2019-03-31 0001329099 us-gaap:PreferredStockMember 2018-10-31 0001329099 bidu:SubsidaryMember 2018-10-31 0001329099 bidu:SmartLivingGroupMember us-gaap:PreferredStockMember 2020-09-30 0001329099 us-gaap:PreferredStockMember 2020-09-30 0001329099 bidu:TwentyTwentySharesRepurchaseProgramMember 2020-05-13 0001329099 bidu:TwentyTwentySharesRepurchaseProgramMember 2020-08-31 0001329099 srt:ParentCompanyMember bidu:TwoThousandAndEightStockIncentivePlanMember srt:RevisionOfPriorPeriodReclassificationAdjustmentMember us-gaap:CommonClassAMember 2008-12-31 0001329099 srt:ParentCompanyMember bidu:TwoThousandAndEightStockIncentivePlanMember us-gaap:CommonClassAMember 2008-12-31 0001329099 srt:ParentCompanyMember bidu:TwoThousandAndEighteenStockIncentivePlanMember srt:RevisionOfPriorPeriodReclassificationAdjustmentMember 2018-07-31 0001329099 srt:ParentCompanyMember bidu:TwoThousandAndEighteenStockIncentivePlanMember 2018-07-31 0001329099 bidu:iQIYIMember bidu:TwoThousandAndSeventeenStockIncentivePlanMember 2017-11-30 0001329099 bidu:IqiyiTwoThousandTwentySixConvertibleNotesMember us-gaap:SubsequentEventMember 2021-01-08 2021-01-08 0001329099 bidu:IqiyiPublicOfferingOfAdssMember us-gaap:SubsequentEventMember 2021-01-08 2021-01-08 0001329099 bidu:IqiyiTwoThousandTwentySixConvertibleNotesMember us-gaap:SubsequentEventMember 2021-01-08 0001329099 bidu:MainlandChinaFilmGroupMember bidu:LicensedCopyrightsMember 2020-01-01 2020-03-31 0001329099 bidu:MainlandChinaFilmGroupMember bidu:ProducedContentMember 2020-01-01 2020-03-31 0001329099 bidu:ChinaUnitedNetworkCommunicationLimitedMember 2017-12-31 0001329099 bidu:MainlandChinaFilmGroupMember bidu:LicensedCopyrightsMember 2020-03-31 0001329099 us-gaap:FairValueInputsLevel3Member bidu:MainlandChinaFilmGroupMember bidu:LicensedCopyrightsMember 2020-03-31 0001329099 bidu:MainlandChinaFilmGroupMember bidu:ProducedContentMember 2020-03-31 0001329099 us-gaap:FairValueInputsLevel3Member bidu:MainlandChinaFilmGroupMember bidu:ProducedContentMember 2020-03-31 0001329099 bidu:JoyysDomesticVideobasedEntertainmentLiveStreamingBusinessMember 2020-11-30 0001329099 bidu:JoyysDomesticVideobasedEntertainmentLiveStreamingBusinessMember 2020-11-01 2020-11-30 0001329099 us-gaap:SubsequentEventMember bidu:UnsecuredUsDollarFloatingRateTermLoanMember 2021-02-28 0001329099 us-gaap:RevolvingCreditFacilityMember us-gaap:SubsequentEventMember 2021-02-28 0001329099 us-gaap:SubsequentEventMember bidu:UnsecuredUsDollarFloatingRateTermLoanMember 2021-02-01 2021-02-28 0001329099 us-gaap:SubsequentEventMember us-gaap:RevolvingCreditFacilityMember 2021-02-01 2021-02-28 0001329099 bidu:iQIYIMember bidu:TwoThousandAndTenStockIncentivePlanMember 2020-09-15 2020-09-15 0001329099 bidu:JoyysDomesticVideobasedEntertainmentLiveStreamingBusinessMember 2020-11-30 2020-11-30 0001329099 bidu:iQIYIMember bidu:TwoThousandAndSeventeenStockIncentivePlanMember 2017-11-30 2017-11-30 0001329099 srt:ParentCompanyMember 2018-07-31 2018-07-31 0001329099 bidu:iQIYIMember bidu:TwoThousandAndTenStockIncentivePlanMember 2010-10-31 2010-10-31 0001329099 bidu:OtherLoansMember bidu:iQIYIMember 2020-10-01 2020-10-31 0001329099 us-gaap:AccumulatedTranslationAdjustmentMember 2017-12-31 0001329099 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2017-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-12-31 0001329099 us-gaap:CommonStockMember 2017-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember 2017-12-31 0001329099 us-gaap:RetainedEarningsMember 2017-12-31 0001329099 us-gaap:NoncontrollingInterestMember 2017-12-31 0001329099 us-gaap:CommonStockMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2017-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2017-12-31 0001329099 us-gaap:RetainedEarningsMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2017-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2017-12-31 0001329099 us-gaap:NoncontrollingInterestMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2017-12-31 0001329099 srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2017-12-31 0001329099 us-gaap:AccumulatedTranslationAdjustmentMember 2018-12-31 0001329099 us-gaap:CommonStockMember 2018-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0001329099 us-gaap:RetainedEarningsMember 2018-12-31 0001329099 us-gaap:NoncontrollingInterestMember 2018-12-31 0001329099 bidu:iQIYIMember 2018-12-31 0001329099 bidu:BaiduCoreBusinessMember 2018-12-31 0001329099 bidu:BaiduCoreBusinessMember 2019-12-31 0001329099 us-gaap:AccumulatedTranslationAdjustmentMember 2019-12-31 0001329099 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-12-31 0001329099 bidu:InvestmentAccountedFairValueMember 2018-12-31 0001329099 us-gaap:AvailableforsaleSecuritiesMember 2018-12-31 0001329099 bidu:InvestmentAccountedFairValueMember 2019-12-31 0001329099 us-gaap:AvailableforsaleSecuritiesMember 2019-12-31 0001329099 us-gaap:CommonStockMember 2019-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember 2019-12-31 0001329099 us-gaap:RetainedEarningsMember 2019-12-31 0001329099 us-gaap:NoncontrollingInterestMember 2019-12-31 0001329099 bidu:BaiduCoreBusinessMember 2020-12-31 0001329099 us-gaap:CommonStockMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2019-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2019-12-31 0001329099 us-gaap:RetainedEarningsMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2019-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2019-12-31 0001329099 us-gaap:NoncontrollingInterestMember srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2019-12-31 0001329099 srt:CumulativeEffectPeriodOfAdoptionAdjustmentMember 2019-12-31 0001329099 us-gaap:AccumulatedTranslationAdjustmentMember 2020-12-31 0001329099 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2020-12-31 0001329099 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2020-12-31 0001329099 bidu:InvestmentAccountedFairValueMember 2020-12-31 0001329099 us-gaap:AvailableforsaleSecuritiesMember 2020-12-31 0001329099 us-gaap:CommonStockMember 2020-12-31 0001329099 us-gaap:AdditionalPaidInCapitalMember 2020-12-31 0001329099 us-gaap:RetainedEarningsMember 2020-12-31 0001329099 us-gaap:NoncontrollingInterestMember 2020-12-31 iso4217:CNY iso4217:USD xbrli:pure xbrli:shares utr:Year utr:Month bidu:Unit bidu:Segment iso4217:USD xbrli:shares bidu:Tranche iso4217:CNY xbrli:shares bidu:Customer bidu:Directors iso4217:USD utr:A