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Acquisitions, Goodwill and Intangible Assets (Details) (USD $)
6 Months Ended 0 Months Ended 1 Months Ended
Apr. 30, 2015
item
May 31, 2015
May 31, 2015
Oct. 31, 2014
Acquisitions        
Number of acquisitions 2us-gaap_NumberOfBusinessesAcquired      
Goodwill $ 31,218,000,000us-gaap_Goodwill      
Goodwill        
Balance at beginning of period 31,139,000,000us-gaap_Goodwill      
Goodwill acquired during period 98,000,000us-gaap_GoodwillAcquiredDuringPeriod      
Goodwill adjustments (19,000,000)us-gaap_GoodwillTranslationAdjustments      
Balance at end of period 31,218,000,000us-gaap_Goodwill      
Accumulated impairment loss 14,500,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss     14,500,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Acquisitions        
Acquisitions        
Total purchase price 162,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= hpq_AcquisitionsMember
     
Goodwill 98,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hpq_AcquisitionsMember
     
Intangible assets 50,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hpq_AcquisitionsMember
     
Goodwill        
Balance at end of period 98,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hpq_AcquisitionsMember
     
Aruba | Subsequent event        
Acquisitions        
Price payable per share   $ 24.67us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= hpq_ArubaNetworksIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
$ 24.67us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= hpq_ArubaNetworksIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Equity value of the transaction   3,000,000,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1
/ us-gaap_BusinessAcquisitionAxis
= hpq_ArubaNetworksIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Equity value net of cash and debt acquired   2,700,000,000hpq_EquityValueNetOfCashAndDebtAcquired
/ us-gaap_BusinessAcquisitionAxis
= hpq_ArubaNetworksIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
H3C | Tsinghua Holdings Subsidiary | Subsequent event        
Acquisitions        
Total purchase price     2,300,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= hpq_H3CMember
/ dei_LegalEntityAxis
= hpq_TsinghuaHoldingsSubsidiaryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Equity interest acquired (as a percent)   51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hpq_H3CMember
/ dei_LegalEntityAxis
= hpq_TsinghuaHoldingsSubsidiaryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= hpq_H3CMember
/ dei_LegalEntityAxis
= hpq_TsinghuaHoldingsSubsidiaryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Ownership percentage   100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= hpq_H3CMember
/ dei_LegalEntityAxis
= hpq_TsinghuaHoldingsSubsidiaryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= hpq_H3CMember
/ dei_LegalEntityAxis
= hpq_TsinghuaHoldingsSubsidiaryMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Personal Systems        
Acquisitions        
Goodwill 2,588,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PersonalSystemsMember
    2,588,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PersonalSystemsMember
Goodwill        
Balance at beginning of period       2,588,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PersonalSystemsMember
Balance at end of period 2,588,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PersonalSystemsMember
    2,588,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PersonalSystemsMember
Printing        
Acquisitions        
Goodwill 2,591,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PrintingMember
    2,591,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PrintingMember
Goodwill        
Balance at beginning of period       2,591,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PrintingMember
Balance at end of period 2,591,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PrintingMember
    2,591,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_PrintingMember
Enterprise Group        
Acquisitions        
Goodwill 16,851,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_EnterpriseStorageServersAndNetworkingMember
     
Goodwill        
Balance at beginning of period 16,867,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_EnterpriseStorageServersAndNetworkingMember
     
Goodwill adjustments (16,000,000)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_EnterpriseStorageServersAndNetworkingMember
     
Balance at end of period 16,851,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_EnterpriseStorageServersAndNetworkingMember
     
Enterprise Services segment        
Acquisitions        
Goodwill 94,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_ServicesSegmentMember
     
Goodwill        
Balance at beginning of period 97,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_ServicesSegmentMember
     
Goodwill adjustments (3,000,000)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_ServicesSegmentMember
     
Balance at end of period 94,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_ServicesSegmentMember
     
Accumulated impairment loss 8,000,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_ServicesSegmentMember
    8,000,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_ServicesSegmentMember
Number of reporting units within ES segment 2us-gaap_NumberOfReportingUnits
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_ServicesSegmentMember
     
Software        
Acquisitions        
Goodwill 8,950,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_SoftwareServicesMember
     
Goodwill        
Balance at beginning of period 8,852,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_SoftwareServicesMember
     
Goodwill acquired during period 98,000,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_SoftwareServicesMember
     
Balance at end of period 8,950,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_SoftwareServicesMember
     
Accumulated impairment loss 5,700,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_SoftwareServicesMember
    5,700,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_SoftwareServicesMember
HP Financial Services        
Acquisitions        
Goodwill 144,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_FinancialServicesMember
    144,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_FinancialServicesMember
Goodwill        
Balance at beginning of period       144,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_FinancialServicesMember
Balance at end of period 144,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_FinancialServicesMember
    144,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_FinancialServicesMember
Corporate Investments        
Goodwill        
Accumulated impairment loss $ 800,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_CorporateInvestmentsMember
    $ 800,000,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= hpq_CorporateInvestmentsMember