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Financial Instruments (Detail 2) (USD $)
In Millions, unless otherwise specified
Oct. 31, 2014
Oct. 31, 2013
Cost    
Due in one year $ 129us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due in one to five years 3us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due in more than five years 360hpq_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsAmortizedCost  
Total 492us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Fair Value    
Due in one year 129us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due in one to five years 3us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due in more than five years 436hpq_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsFairValue  
Total 568us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Investment Holdings    
Investment amount 717us-gaap_AvailableForSaleSecurities 770us-gaap_AvailableForSaleSecurities
Equity securities in privately held companies | Long-term Financing Receivables and Other Assets    
Investment Holdings    
Investment amount $ 97us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= hpq_LongTermFinancingReceivablesAndOtherAssetsMember
/ us-gaap_InvestmentTypeAxis
= hpq_EquitySecuritiesInPrivatelyHeldCompaniesMember		 $ 50us-gaap_AvailableForSaleSecurities
/ us-gaap_BalanceSheetLocationAxis
= hpq_LongTermFinancingReceivablesAndOtherAssetsMember
/ us-gaap_InvestmentTypeAxis
= hpq_EquitySecuritiesInPrivatelyHeldCompaniesMember