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Retirement and Post-Retirement Benefit Plans (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2012
Defined Contribution Plan Disclosure [Line Items]      
Total defined contribution expense $ 573us-gaap_DefinedContributionPlanCostRecognized $ 603us-gaap_DefinedContributionPlanCostRecognized $ 628us-gaap_DefinedContributionPlanCostRecognized
HP 401(k) Plan      
Defined Contribution Plan Disclosure [Line Items]      
Percent of equal 401(k) match to employees effective during the period 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_DefinedContributionPlanNameAxis
= hpq_HPDefinedContributionPlanMember		    
Percentage of maximum matching contribution 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedContributionPlanNameAxis
= hpq_HPDefinedContributionPlanMember