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Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $)
12 Months Ended 3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Intangible assets        
Amortizable intangible assets, accumulated amortization $ (4,790,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ (4,886,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization    
Finite-lived Intangible Assets, Accumulated Impairment Losses (4,330,000,000)hpq_AccumulatedImpairmentOfIntangibleAssetsFinitelived (4,330,000,000)hpq_AccumulatedImpairmentOfIntangibleAssetsFinitelived    
Amortizable intangible assets, net 2,128,000,000us-gaap_FiniteLivedIntangibleAssetsNet      
Intangible assets, gross 11,248,000,000hpq_AcquiredFiniteLivedAndIndefiniteLivedIntangibleAssetsGross 12,385,000,000hpq_AcquiredFiniteLivedAndIndefiniteLivedIntangibleAssetsGross    
Intangible assets 2,128,000,000us-gaap_IntangibleAssetsNetExcludingGoodwill 3,169,000,000us-gaap_IntangibleAssetsNetExcludingGoodwill    
Amount of fully amortized intangible assets 855,000,000hpq_FiniteLivedIntangibleAssetsFullyAmortized 1,700,000,000hpq_FiniteLivedIntangibleAssetsFullyAmortized    
Intangible asset impairment charges     4,300,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived  
Impairment of goodwill and intangible assets     18,035,000,000us-gaap_GoodwillAndIntangibleAssetImpairment  
Autonomy        
Intangible assets        
Intangible asset impairment charges     3,100,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_BusinessAcquisitionAxis
= hpq_AcquisitionOfAutonomyMember
 
Impairment of goodwill and intangible assets     8,800,000,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_BusinessAcquisitionAxis
= hpq_AcquisitionOfAutonomyMember
 
In-process research and development        
Intangible assets        
Indefinite-lived intangible assets   3,000,000us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember
   
Customer contracts, customer lists and distribution agreements        
Intangible assets        
Amortizable intangible assets, gross 5,289,000,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
5,321,000,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
   
Amortizable intangible assets, accumulated amortization (3,228,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
(2,709,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
   
Finite-lived Intangible Assets, Accumulated Impairment Losses (856,000,000)hpq_AccumulatedImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
(856,000,000)hpq_AccumulatedImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
   
Amortizable intangible assets, net 1,205,000,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
1,756,000,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
   
Weighted-Average Useful Lives 8 years      
Developed and core technology and patents        
Intangible assets        
Amortizable intangible assets, gross 4,266,000,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
5,331,000,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
   
Amortizable intangible assets, accumulated amortization (1,301,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
(1,966,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
   
Finite-lived Intangible Assets, Accumulated Impairment Losses (2,138,000,000)hpq_AccumulatedImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
(2,138,000,000)hpq_AccumulatedImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
   
Amortizable intangible assets, net 827,000,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
1,227,000,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
   
Weighted-Average Useful Lives 8 years      
Trade name and trade marks        
Intangible assets        
Amortizable intangible assets, gross 1,693,000,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
1,730,000,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
   
Amortizable intangible assets, accumulated amortization (261,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
(211,000,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
   
Intangible Assets, Accumulated Impairment Losses (1,336,000,000)hpq_IntangibleAssetsAccumulatedImpairmentLosses
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
(1,336,000,000)hpq_IntangibleAssetsAccumulatedImpairmentLosses
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
   
Amortizable intangible assets, net 96,000,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
183,000,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
   
Weighted-Average Useful Lives 7 years      
Compaq        
Intangible assets        
Intangible asset impairment charges     1,200,000,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Impairment of goodwill and intangible assets       $ 1,200,000,000us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember