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Disclosure - Note 12 - c) Long-term debt, in Brazil (Detail) Sheet http://www.petrobras.com.br/role/DisclosureIssuanceOfLongTermDebtInBrazil Note 12 - c) Long-term debt, in Brazil (Detail) false false R89.htm 19972 - Disclosure - Note 12 - d.1) Issuance of long-term debt, foreign (Detail) Sheet http://www.petrobras.com.br/role/LongTermDebtIssuance Note 12 - d.1) Issuance of long-term debt, foreign (Detail) false false R90.htm 19974 - Disclosure - Note 12 - d.2) Issuance of long-term debt in Brazil (Detail) Sheet http://www.petrobras.com.br/role/LongTermDebtIssuanceInBrazil Note 12 - d.2) Issuance of long-term debt in Brazil (Detail) false false R91.htm 19976 - Disclosure - Note 12 - Financing, Additional Information (Detail) Sheet http://www.petrobras.com.br/role/FinancingsAdditionalInformation Note 12 - Financing, Additional Information (Detail) false false R92.htm 19977 - Disclosure - Note 13 - Financial Income (Expenses), Net (Detail) Sheet http://www.petrobras.com.br/role/FinancialIncomeExpenseNet Note 13 - Financial Income (Expenses), Net (Detail) false false R93.htm 19978 - Disclosure - Note 14 - Capital Lease Obligations (Detail) Sheet http://www.petrobras.com.br/role/CapitalLeaseObligations Note 14 - Capital Lease Obligations (Detail) false false R94.htm 19979 - Disclosure - Note 14 - Capital Lease Obligations, Additional Information (Detail) Sheet http://www.petrobras.com.br/role/CapitalLeaseObligationsAdditionalInformation Note 14 - Capital Lease Obligations, Additional Information (Detail) false false R95.htm 19980 - Disclosure - Note 15 - Employees' Postretirement Benefits and Other Benefits, Employees' postretirement benefits balances (Detail) Sheet http://www.petrobras.com.br/role/PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilities Note 15 - Employees' Postretirement Benefits and Other Benefits, Employees' postretirement benefits balances (Detail) false false R96.htm 19981 - Disclosure - Note 15.4 - Employees' Postretirement Benefits and Other Benefits, Plan Assets (Detail) Sheet http://www.petrobras.com.br/role/DefinedBenefitPlanInformationAboutPlanAssets Note 15.4 - 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Disclosure - Note 15.6 b) - Employees' Postretirement Benefits and Other Benefits, Net periodic benefit cost (Detail) Sheet http://www.petrobras.com.br/role/DefinedBenefitPlanNetPeriodicBenefitCost Note 15.6 b) - Employees' Postretirement Benefits and Other Benefits, Net periodic benefit cost (Detail) false false R101.htm 19986 - Disclosure - Note 15.6 c) - Employees' Postretirement Benefits and Other Benefits, Changes in amounts recorded in accumulated other comprehensive income (Detail) Sheet http://www.petrobras.com.br/role/DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax Note 15.6 c) - Employees' Postretirement Benefits and Other Benefits, Changes in amounts recorded in accumulated other comprehensive income (Detail) false false R102.htm 19987 - Disclosure - Note 15.6 c) - Employees' Postretirement Benefits and Other Benefits, Amounts included in accumulated other comprehensive income that are expected to be amortized into net periodic postretirement cost during the next year (Detail) Sheet http://www.petrobras.com.br/role/DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYear Note 15.6 c) - 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Disclosure - Note 15 - Employees' Postretirement Benefits and Other Benefits, Additional Information (Detail) Sheet http://www.petrobras.com.br/role/PensionAndOtherPostretirementBenefitsDisclosureAdditionalInformation Note 15 - Employees' Postretirement Benefits and Other Benefits, Additional Information (Detail) false false R106.htm 19990 - Disclosure - Note 16 - Shareholders' Equity, Basic and diluted earnings per share (Detail) Sheet http://www.petrobras.com.br/role/EarningsPerShare Note 16 - Shareholders' Equity, Basic and diluted earnings per share (Detail) false false R107.htm 19991 - Disclosure - Note 16 - Shareholders' Equity, Dividends and interest on shareholders' equity (Detail) Sheet http://www.petrobras.com.br/role/DividendsAndInterestOnShareholdersEquity Note 16 - Shareholders' Equity, Dividends and interest on shareholders' equity (Detail) false false R108.htm 19992 - Disclosure - Note 16 - Shareholders' Equity, Additional Information (Detail) Sheet http://www.petrobras.com.br/role/ShareholdersEquityAdditionalinformation Note 16 - 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Disclosure - Note 19 - Derivative Instruments, Hedging and Risk Management Activities, Cash flow hedge (Detail) Sheet http://www.petrobras.com.br/role/CrossCurrencySwaps Note 19 - Derivative Instruments, Hedging and Risk Management Activities, Cash flow hedge (Detail) false false R121.htm 20005 - Disclosure - Note 19 - Derivative Instruments, Hedging and Risk Management Activities, Sale of ethanol (Detail) Sheet http://www.petrobras.com.br/role/SaleOfEthanol Note 19 - Derivative Instruments, Hedging and Risk Management Activities, Sale of ethanol (Detail) false false R122.htm 20006 - Disclosure - Note 19 - Derivative Instruments, Hedging and Risk Management Activities, Tabular presentation of the location and amounts of derivative fair values (Detail) Sheet http://www.petrobras.com.br/role/DerivativeInstrumentsInStatementOfFinancialPositionFairValueAbstract Note 19 - Derivative Instruments, Hedging and Risk Management Activities, Tabular presentation of the location and amounts of derivative fair values (Detail) false false R123.htm 20007 - 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Financial Instruments, Financial Assets and Liabilities at fair value on a recurring basis (Detail) false false R126.htm 20010 - Disclosure - Note 20 - Financial Instruments, Non financial Assets and Liabilities at fair value on non recurring basis (Detail) Sheet http://www.petrobras.com.br/role/NonFinancialInstrumentsFinancialAssetsAndLiabilitiesAtFairValueOnNonRecurringBasis Note 20 - Financial Instruments, Non financial Assets and Liabilities at fair value on non recurring basis (Detail) false false R127.htm 20011 - Disclosure - Note 20 - Financial Instruments Additional Information (Detail) Sheet http://www.petrobras.com.br/role/FinancialInstrumentsAdditionalInformation Note 20 - Financial Instruments Additional Information (Detail) false false R128.htm 20012 - Disclosure - Note 21 - Reconciliation of assets from segment to consolidated (Detail) Sheet http://www.petrobras.com.br/role/ReconciliationOfAssetsFromSegmentToConsolidated Note 21 - Reconciliation of assets from segment to consolidated (Detail) false false R129.htm 20013 - Disclosure - Note 21 - Reconciliation of assets from segment to consolidated, International (Detail) Sheet http://www.petrobras.com.br/role/ReconciliationOfAssetsFromSegmentToConsolidatedInternational Note 21 - Reconciliation of assets from segment to consolidated, International (Detail) false false R130.htm 20014 - Disclosure - Note 21 - Reconciliation of revenues from segment to consolidated (Detail) Sheet http://www.petrobras.com.br/role/ReconciliationOfRevenueFromSegmentToConsolidated Note 21 - Reconciliation of revenues from segment to consolidated (Detail) false false R131.htm 20015 - Disclosure - Note 21 - Reconciliation of revenues from segment to consolidated, International (Detail) Sheet http://www.petrobras.com.br/role/ReconciliationOfRevenueFromSegmentToConsolidatedInternational Note 21 - Reconciliation of revenues from segment to consolidated, International (Detail) false false R132.htm 20016 - Disclosure - Note 21 - Capital Expenditures Incurred by Segment (Detail) Sheet http://www.petrobras.com.br/role/CapitalExpendituresIncurredBySegment Note 21 - Capital Expenditures Incurred by Segment (Detail) false false R133.htm 20017 - Disclosure - Note 21 - Capital Expenditures Incurred by Geographic Destination (Detail) Sheet http://www.petrobras.com.br/role/CapitalExpendituresIncurredByGeographicDestination Note 21 - Capital Expenditures Incurred by Geographic Destination (Detail) false false R134.htm 20018 - Disclosure - Note 21 - Capital Expenditures Incurred Additional Information (Detail) Sheet http://www.petrobras.com.br/role/CapitalExpendituresIncurredAdditionalInformation Note 21 - Capital Expenditures Incurred Additional Information (Detail) false false R135.htm 20019 - Disclosure - Note 22 - Related Party Transactions (Detail) Sheet http://www.petrobras.com.br/role/RelatedPartyTransactions Note 22 - Related Party Transactions (Detail) false false R136.htm 20020 - Disclosure - Note 22 - Related Party Transactions by Balance Sheet Classification (Detail) Sheet http://www.petrobras.com.br/role/RelatedPartyTransactionsBalanceSheetClassification Note 22 - Related Party Transactions by Balance Sheet Classification (Detail) false false R137.htm 20021 - Disclosure - Note 22 - Related Party Transactions, Business And Financial Operations (Detail) Sheet http://www.petrobras.com.br/role/RelatedPartyTransactionsBusinessAndFinancialOperations Note 22 - Related Party Transactions, Business And Financial Operations (Detail) false false R138.htm 20022 - Disclosure - Note 22 - Related Party Transactions Additional Information (Detail) Sheet http://www.petrobras.com.br/role/RelatedPartyTransactionsAdditionalInformation Note 22 - Related Party Transactions Additional Information (Detail) false false R139.htm 20023 - Disclosure - Note 23 - Accounting for Suspended Exploratory Wells, Unproved oil and gas properties (Detail) Sheet http://www.petrobras.com.br/role/IncreaseDecreaseInCapitalizedExploratoryWellCostsThatArePendingDeterminationOfProvedReservesRollForward Note 23 - Accounting for Suspended Exploratory Wells, Unproved oil and gas properties (Detail) false false R140.htm 20024 - Disclosure - Note 23 - Accounting for Suspended Exploratory Wells, Aging of capitalized exploratory well costs (Detail) Sheet http://www.petrobras.com.br/role/CapitalizedExploratoryWellCosts Note 23 - Accounting for Suspended Exploratory Wells, Aging of capitalized exploratory well costs (Detail) false false R141.htm 20025 - Disclosure - Note 23 - Accounting for Suspended Exploratory Wells, Aging based on drilling completion date of individual wells (Detail) Sheet http://www.petrobras.com.br/role/AgingOfSuspendedExploratoryWellCapitalizedCostBasedOnDrillingCompletionDate Note 23 - Accounting for Suspended Exploratory Wells, Aging based on drilling completion date of individual wells (Detail) false false R142.htm 20026 - Disclosure - Note 23 - Accounting for Suspended Exploratory Wells, Additional Information (Detail) Sheet http://www.petrobras.com.br/role/AccountingforSuspendedExploratoryWellsAdditionalInformation Note 23 - Accounting for Suspended Exploratory Wells, Additional Information (Detail) false false R143.htm 20027 - Disclosure - Note 24 - Subsequent Events, Additional Information (Detail) Sheet http://www.petrobras.com.br/role/SubsequentEventsAdditionalInformation Note 24 - Subsequent Events, Additional Information (Detail) false false R144.htm 20028 - Disclosure - Supplementary Information, Capitalized costs relating to oil and gas producing activities (Detail) Sheet http://www.petrobras.com.br/role/CapitalizedCostsRelatingToOilAndGasProducingActivitiesDisclosureTextBlock Supplementary Information, Capitalized costs relating to oil and gas producing activities (Detail) false false R145.htm 20029 - Disclosure - Supplementary Information, Costs incurred in oil and gas property acquisition, exploration and development activities (Detail) Sheet http://www.petrobras.com.br/role/CostIncurredInOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivitiesDisclosureTextBlock Supplementary Information, Costs incurred in oil and gas property acquisition, exploration and development activities (Detail) false false R146.htm 20030 - Disclosure - Supplementary Information, Results of operations for oil and gas producing activities (Detail) Sheet http://www.petrobras.com.br/role/ResultsOfOperationsForOilAndGasProducingActivitiesDisclosureTextBlock Supplementary Information, Results of operations for oil and gas producing activities (Detail) false false R147.htm 20031 - Disclosure - Supplementary Information, Oil Reserve quantities information (Detail) Sheet http://www.petrobras.com.br/role/ProvedOilAndGasReserveQuantitiesDisclosureTextBlock Supplementary Information, Oil Reserve quantities information (Detail) false false R148.htm 20032 - Disclosure - Supplementary Information, Gas Reserve quantities information (Detail) Sheet http://www.petrobras.com.br/role/ProvedGasReserveQuantitiesDisclosureTextBlock Supplementary Information, Gas Reserve quantities information (Detail) false false R149.htm 20033 - Disclosure - Supplementary Information, Reserve quantities information (Detail) Sheet http://www.petrobras.com.br/role/NetProvedDevelopedReservesTextBlock Supplementary Information, Reserve quantities information (Detail) false false R150.htm 20034 - Disclosure - Supplementary Information, Standardized measure of discounted future net cash flows relating to proved oil and gas quantities and changes therein (Detail) Sheet http://www.petrobras.com.br/role/StandardizedMeasureOfDiscountedFutureCashFlowsRelatingToProvedReservesDisclosureTextBlock Supplementary Information, Standardized measure of discounted future net cash flows relating to proved oil and gas quantities and changes therein (Detail) false false R151.htm 20035 - Disclosure - Supplementary Information, Standardized measure of discounted future net cash flows relating to proved oil and gas quantities and changes therein (Detail) Sheet http://www.petrobras.com.br/role/IncreaseDecreaseInStandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesRollForwardTextBlock Supplementary Information, Standardized measure of discounted future net cash flows relating to proved oil and gas quantities and changes therein (Detail) false false All Reports Book All Reports 'Monetary' elements on report '19997 - Disclosure - Note 17 - Acquisition/Sales of Assets and Interests, Additional Information (Detail)' had a mix of different decimal attribute values. 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