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Stockholders' Equity (Details) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Oct. 31, 2011
Stockholders' Equity          
Repurchases of common stock (in shares) 18us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 27us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 54us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 48us-gaap_StockRepurchasedAndRetiredDuringPeriodShares  
Payment in connection with repurchases of shares $ 600,000,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 800,000,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 2,230,000,000us-gaap_PaymentsForRepurchaseOfCommonStock $ 1,396,000,000us-gaap_PaymentsForRepurchaseOfCommonStock  
Share repurchase authorization remaining 2,700,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1   2,700,000,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1    
Share repurchase authorization increase after balance sheet date         10,000,000,000hpq_StockRepurchaseAuthorizationIncreaseValueAfterBalanceSheetDate
Tax effects on change in unrealized losses on available-for-sale securities:          
Tax benefit (provision) on unrealized losses arising during the period 18,000,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (2,000,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 3,000,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (1,000,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax  
Tax effect on change in unrealized losses on available for sale securities 18,000,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax (2,000,000)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax 3,000,000us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax (1,000,000)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax  
Tax effects on change in unrealized losses on cash flow hedges:          
Tax benefit (provision) on unrealized (losses) gains arising during the period 20,000,000us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 75,000,000us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax (181,000,000)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 35,000,000us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax  
Tax provision (benefit) on (gains) losses reclassified into earnings 157,000,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax (29,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax 255,000,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax (63,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax  
Tax effect on change in unrealized losses on cash flow hedges 177,000,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax 46,000,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax 74,000,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax (28,000,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax  
Tax effects on change in unrealized components of defined benefit plans:          
Tax benefit on losses arising during the period   21,000,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax   21,000,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax  
Tax provision (benefit) on amortization of actuarial loss and prior service benefit 1,000,000hpq_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossAndNetPriorServiceCostRecognizedInNetPeriodicPensionCostTax (2,000,000)hpq_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossAndNetPriorServiceCostRecognizedInNetPeriodicPensionCostTax (13,000,000)hpq_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossAndNetPriorServiceCostRecognizedInNetPeriodicPensionCostTax (14,000,000)hpq_OtherComprehensiveIncomeAmortizationOfDefinedBenefitPlanActuarialLossAndNetPriorServiceCostRecognizedInNetPeriodicPensionCostTax  
Tax provision on curtailments, settlements and other (1,000,000)us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax (7,000,000)us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax (1,000,000)us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax (7,000,000)us-gaap_OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax  
Tax effect on change in unrealized components of defined benefit plans   12,000,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (14,000,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax    
Tax benefit (provision) on change in cumulative translation adjustment 3,000,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent 12,000,000us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent (44,000,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent (8,000,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationAdjustmentTaxPortionAttributableToParent  
Tax benefit (provision) on other comprehensive loss 198,000,000us-gaap_OtherComprehensiveIncomeLossTax 68,000,000us-gaap_OtherComprehensiveIncomeLossTax 19,000,000us-gaap_OtherComprehensiveIncomeLossTax (37,000,000)us-gaap_OtherComprehensiveIncomeLossTax  
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Amounts reclassified from accumulated other comprehensive income     (432,000,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax    
Other comprehensive (loss) income, before reclassification     311,000,000us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax    
Other comprehensive loss, net of taxes (327,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax (162,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax (121,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax (51,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax  
Net revenue (25,453,000,000)us-gaap_Revenues (27,309,000,000)us-gaap_Revenues (52,292,000,000)us-gaap_Revenues (55,463,000,000)us-gaap_Revenues  
Cost of products 13,070,000,000us-gaap_CostOfGoodsSold 13,464,000,000us-gaap_CostOfGoodsSold 27,145,000,000us-gaap_CostOfGoodsSold 27,989,000,000us-gaap_CostOfGoodsSold  
Interest and other, net 139,000,000us-gaap_NonoperatingIncomeExpense 174,000,000us-gaap_NonoperatingIncomeExpense 313,000,000us-gaap_NonoperatingIncomeExpense 337,000,000us-gaap_NonoperatingIncomeExpense  
Total 556,000,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax (101,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax 890,000,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax (210,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax  
Change in net unrealized gains (losses) on available-for-sale securities          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Other comprehensive (loss) income, before reclassification (41,000,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (2,000,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (10,000,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (2,000,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Other comprehensive loss, net of taxes (41,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (2,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (10,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (3,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Change in net unrealized gains (losses) on available-for-sale securities | Reclassifications of losses (gains) into earnings          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Amounts reclassified from accumulated other comprehensive income       (1,000,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		  
Change in net unrealized gains (losses) on cash flow hedges          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Amounts reclassified from accumulated other comprehensive income     (635,000,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		    
Other comprehensive (loss) income, before reclassification 2,000,000us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
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/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 432,000,000us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (204,000,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Other comprehensive loss, net of taxes (397,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (162,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (203,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (57,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Change in net unrealized gains (losses) on cash flow hedges | Reclassifications of losses (gains) into earnings          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Amounts reclassified from accumulated other comprehensive income (399,000,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 72,000,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (635,000,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 147,000,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Net revenue (533,000,000)us-gaap_Revenues
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 63,000,000us-gaap_Revenues
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (867,000,000)us-gaap_Revenues
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 126,000,000us-gaap_Revenues
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Cost of products 43,000,000us-gaap_CostOfGoodsSold
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 21,000,000us-gaap_CostOfGoodsSold
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 69,000,000us-gaap_CostOfGoodsSold
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 44,000,000us-gaap_CostOfGoodsSold
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Other operating expenses 3,000,000us-gaap_OtherGeneralExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 3,000,000us-gaap_OtherGeneralExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 7,000,000us-gaap_OtherGeneralExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 7,000,000us-gaap_OtherGeneralExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Interest and other, net (69,000,000)us-gaap_NonoperatingIncomeExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 14,000,000us-gaap_NonoperatingIncomeExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (99,000,000)us-gaap_NonoperatingIncomeExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 33,000,000us-gaap_NonoperatingIncomeExpense
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		  
Total (556,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 101,000,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
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= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember		 (890,000,000)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
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/ us-gaap_StatementEquityComponentsAxis
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/ us-gaap_StatementEquityComponentsAxis
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Change in unrealized components of defined benefit plans          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Amounts reclassified from accumulated other comprehensive income     203,000,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other comprehensive (loss) income, before reclassification     1,000,000us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		    
Other comprehensive loss, net of taxes 108,000,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 7,000,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 204,000,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 58,000,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
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Amortization of actuarial loss and prior service benefit | Reclassifications of losses (gains) into earnings          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Amounts reclassified from accumulated other comprehensive income 105,000,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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= hpq_AccumulatedDefinedBenefitPlansAdjustmentActuarialGainLossAndNetPriorServiceCostCreditMember		 64,000,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= hpq_AccumulatedDefinedBenefitPlansAdjustmentActuarialGainLossAndNetPriorServiceCostCreditMember		 203,000,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementEquityComponentsAxis
= hpq_AccumulatedDefinedBenefitPlansAdjustmentActuarialGainLossAndNetPriorServiceCostCreditMember		 115,000,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
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Curtailments, settlements and other          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Other comprehensive loss, net of taxes 3,000,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= hpq_AccumulatedDefinedBenefitPlansAdjustmentCurtailmentsSettlementsAndOtherMember		 33,000,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= hpq_AccumulatedDefinedBenefitPlansAdjustmentCurtailmentsSettlementsAndOtherMember		 1,000,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
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= hpq_AccumulatedDefinedBenefitPlansAdjustmentCurtailmentsSettlementsAndOtherMember		  
Losses (gains) reclassified into earnings          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Other comprehensive (loss) income, before reclassification   (90,000,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember		   (90,000,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember		  
Change in cumulative translation adjustment          
Changes and reclassifications related to Other Comprehensive Loss, net of taxes          
Other comprehensive (loss) income, before reclassification     (112,000,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		    
Other comprehensive loss, net of taxes $ 3,000,000us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 $ (5,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 $ (112,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember		 $ (49,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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