Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Segment Reporting Information
Net Revenue	$ 25,453us-gaap_Revenues	$ 27,309us-gaap_Revenues	$ 52,292us-gaap_Revenues	$ 55,463us-gaap_Revenues
Total segment earnings from operations	1,431us-gaap_OperatingIncomeLoss	1,822us-gaap_OperatingIncomeLoss	3,351us-gaap_OperatingIncomeLoss	3,819us-gaap_OperatingIncomeLoss
Stock-based compensation expense	(129)	(130)	(316)	(300)
Amortization of intangible assets	(221)us-gaap_AmortizationOfIntangibleAssets	(264)us-gaap_AmortizationOfIntangibleAssets	(443)us-gaap_AmortizationOfIntangibleAssets	(547)us-gaap_AmortizationOfIntangibleAssets
Restructuring charges	(255)us-gaap_RestructuringCharges	(252)us-gaap_RestructuringCharges	(401)us-gaap_RestructuringCharges	(366)us-gaap_RestructuringCharges
Acquisition-related charges	(19)	(3)	(23)	(6)
Separation costs	(269)hpq_SeparationCosts		(349)hpq_SeparationCosts
Interest and other, net	(139)us-gaap_NonoperatingIncomeExpense	(174)us-gaap_NonoperatingIncomeExpense	(313)us-gaap_NonoperatingIncomeExpense	(337)us-gaap_NonoperatingIncomeExpense
Earnings before taxes	1,292	1,648	3,038	3,482
Operating segments
Segment Reporting Information
Net Revenue	26,270	28,189	54,021	57,173
Total segment earnings from operations	2,476	2,722	5,217	5,410
Elimination of inter-segment net revenue and other
Segment Reporting Information
Net Revenue	(817)	(880)	(1,729)	(1,710)
Significant Reconciling Items
Segment Reporting Information
Corporate and unallocated costs and eliminations	(152)	(251)	(334)	(372)
Stock-based compensation expense	(129)	(130)	(316)	(300)
Amortization of intangible assets	(221)	(264)	(443)	(547)
Restructuring charges	(255)	(252)	(401)	(366)
Acquisition-related charges	(19)	(3)	(23)	(6)
Separation costs	(269)		(349)
Interest and other, net	$ (139)	$ (174)	$ (313)	$ (337)

Amount of reconciling item for corporate and unallocated costs, gains and eliminations.

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Represents information pertaining to expenses associated with the company's plan to separate into two independent publicly-traded companies. The charges are related primarily to third-party consulting fees and other expenses incurred to complete the separation, such as: finance, IT, consulting and legal fees, real estate, and other items.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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