Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Jul. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Consolidated Condensed Financial Statements of HP and its wholly-owned subsidiaries are prepared in conformity with United States (“U.S.”) generally accepted accounting principles (“GAAP”). The interim financial information is unaudited but reflects all normal adjustments that are necessary to provide a fair statement of results for the interim periods presented. This interim information should be read in conjunction with the Consolidated Condensed Financial Statements for the fiscal year ended October 31, 2017 in the Annual Report on Form 10-K, filed on December 14, 2017. The Consolidated Condensed Balance Sheet for October 31, 2017 was derived from audited financial statements.
Principles of Consolidation	Principles of Consolidation The Consolidated Condensed Financial Statements include the accounts of HP and its subsidiaries and affiliates in which HP has a controlling financial interest or is the primary beneficiary. All intercompany balances and transactions have been eliminated.
Reclassifications	Reclassifications HP implemented an organizational change to align its segment and business unit financial reporting more closely with its current business structure. HP reflected this change to its segment and business unit information in prior reporting periods on an as-if basis. The reporting changes had no impact on previously reported consolidated net revenue, earnings from operations, net earnings or net earnings per share (“EPS”). See Note 2, “Segment Information”, for a further discussion of HP’s segment and business unit realignments.
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in HP’s Consolidated Condensed Financial Statements and accompanying notes. Actual results could differ materially from those estimates.
Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Issued Accounting Pronouncements Not Yet Adopted In February 2018, the Financial Accounting Standards Board (“FASB”) issued guidance, which eliminates the stranded tax effects in other comprehensive income resulting from the Tax Cuts and Jobs Act (the “TCJA”). Because the amendments only relate to the reclassification of the income tax effects of the TCJA, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. HP is required to adopt the guidance in the first quarter of fiscal year 2020. Earlier adoption is permitted. HP is currently evaluating the timing and the impact of this guidance on the Consolidated Condensed Financial Statements. In August 2017, the FASB issued guidance, which amends the existing accounting standards for derivatives and hedging. The amendment improves the financial reporting of hedging relationships to better represent the economic results of an entity’s risk management activities in its financial statements and made certain targeted improvements to simplify the application of the hedge accounting guidance in current U.S. GAAP. HP is required to adopt the guidance in the first quarter of fiscal year 2020. Earlier adoption is permitted. HP is currently evaluating the timing and impact of this guidance on the Consolidated Condensed Financial Statements. In January 2017, the FASB issued guidance, which amends the existing accounting standards for business combinations. The amendments clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. HP is required to adopt the guidance in the first quarter of fiscal year 2019. Earlier adoption is permitted. HP currently expects to early adopt this guidance in the fourth quarter of fiscal year 2018. HP expects that the implementation of this guidance will not have a material impact on its Consolidated Condensed Financial Statements. In November 2016, the FASB issued guidance, which addresses the presentation of restricted cash in the statement of cash flows. The guidance requires entities to present the changes in the total of cash, cash equivalents, restricted cash, and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. HP is required to adopt the guidance retrospectively in the first quarter of fiscal year 2019. Earlier adoption is permitted. HP will adopt this guidance in the first quarter of fiscal year 2019. HP expects that the implementation of this guidance will not have a material impact on its Consolidated Condensed Financial Statements. In October 2016, the FASB issued guidance, which amends the existing accounting for Intra-Entity Transfers of Assets Other Than Inventory. The guidance requires an entity to recognize the income tax consequences of intra-entity transfers, other than inventory, when the transfer occurs. It also requires modified retrospective transition with a cumulative catch-up adjustment to opening retained earnings in the period of adoption. HP is required to adopt the guidance in the first quarter of fiscal year 2019. Earlier adoption is permitted. HP will adopt this guidance in the first quarter of fiscal year 2019. HP expects that the implementation of this guidance will not have a material impact on its Consolidated Condensed Financial Statements. In August 2016, the FASB issued guidance, which amends the existing accounting standards for the classification of certain cash receipts and cash payments on the statement of cash flows. HP is required to adopt the guidance in the first quarter of fiscal year 2019. Earlier adoption is permitted. HP will adopt this guidance in the first quarter of fiscal year 2019. HP expects that the implementation of this guidance will not have a material impact on its Consolidated Condensed Financial Statements. In June 2016, the FASB issued guidance, which requires credit losses on financial assets measured at amortized cost basis to be presented at the net amount expected to be collected, not based on incurred losses. Further, credit losses on available-for-sale debt securities should be recorded through an allowance for credit losses limited to the amount by which fair value is below amortized cost. HP is required to adopt the guidance in the first quarter of fiscal year 2021. Earlier adoption is permitted. HP is currently evaluating the timing and the impact of this guidance on the Consolidated Condensed Financial Statements. In February 2016, the FASB issued guidance, which amends the existing accounting standards for leases. Consistent with current guidance, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification. Under the new guidance, a lessee will be required to recognize assets and liabilities for all leases with lease terms of more than twelve months. HP will adopt the new lease standard in the first quarter of fiscal year 2020 using a modified retrospective approach. HP is currently evaluating the impact of this guidance on the Consolidated Condensed Financial Statements. In January 2016, the FASB issued guidance, which amends the existing accounting standards for the recognition and measurement of financial assets and financial liabilities. The guidance primarily addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. HP is required to adopt the guidance in the first quarter of fiscal year 2019. The amendments should be applied by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption, with other amendments related specifically to equity securities without readily determinable fair values applied prospectively. Earlier adoption is permitted. HP will adopt this guidance in the first quarter of fiscal year 2019. HP expects that the implementation of this guidance will not have a material impact on its Consolidated Condensed Financial Statements. In May 2014, the FASB issued guidance, which amends the existing accounting standards for revenue recognition. The amendments (Topic 606) are based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendments may be applied retrospectively to each prior period presented (“full retrospective method”) or retrospectively with the cumulative effect recognized as of the date of initial application (“modified retrospective method”). HP will adopt the new revenue standard in the first quarter of fiscal year 2019 and intends to apply the modified retrospective method. Based on the assessment, it is not anticipated that the adoption will have a material impact on the amount or timing of revenue recognized in the Consolidated Condensed Financial Statements. We continue to make progress on assessing the overall impact of adoption of the standard on our business processes, systems and controls.
Segment Information	The accounting policies HP uses to derive segment results are substantially the same as those used in preparing these financial statements. HP derives the results of the business segments directly from its internal management reporting system. HP does not allocate certain operating expenses, which it manages at the corporate level, to its segments. These unallocated amounts include certain corporate governance costs and market-related retirement credits, stock-based compensation expense, restructuring and other charges, acquisition-related charges, amortization of intangible assets, defined benefit plan settlement charges
Employer Contributions and Funding Policy	Employer Contributions and Funding Policy HP’s policy is to fund its pension plans so that it makes at least the minimum contribution required by local government, funding and taxing authorities.
Stock-Based Compensation	HP uses the closing stock price on the grant date to estimate the fair value of service-based restricted stock units. HP did not grant any restricted stock units subject to performance-adjusted vesting conditions for the three months ended July 31, 2017. HP estimates the fair value of restricted stock units subject to performance-adjusted vesting conditions using a combination of the closing stock price on the grant date and a Monte Carlo simulation model. Stock Options HP utilizes the Black-Scholes-Merton option pricing model to estimate the fair value of stock options subject to service-based vesting conditions. HP estimates the fair value of stock options subject to performance-contingent vesting conditions using a combination of a Monte Carlo simulation model and a lattice model, as these awards contain market conditions.
Taxes on Earnings	HP recognizes interest income from favorable settlements and interest expense and penalties accrued on unrecognized tax benefits in the provision for taxes in the Consolidated Condensed Statements of Earnings.
Transfers and Servicing Trade Receivables Policy	HP has third-party arrangements, consisting of revolving short-term financing, which provide liquidity to certain partners in order to facilitate their working capital requirements. These financing arrangements, which in certain circumstances may contain partial recourse, result in a transfer of HP’s receivables and risk to the third party. As these transfers qualify as true sales under the applicable accounting guidance, the receivables are derecognized from the Consolidated Condensed Balance Sheets upon transfer, and HP receives a payment for the receivables from the third party within a mutually agreed upon time period. For arrangements involving an element of recourse, the recourse obligation is measured using market data from the similar transactions and reported as a current liability in the Consolidated Condensed Balance Sheets.
Fair Value	Valuation Techniques Cash Equivalents and Investments: HP holds time deposits, money market funds, mutual funds, other debt securities primarily consisting of corporate and government notes and bonds, and common stock and equivalents. HP values cash equivalents and equity investments using quoted market prices, alternative pricing sources, including net asset value, or models utilizing market observable inputs. The fair value of debt investments is based on quoted market prices or model-driven valuations using inputs primarily derived from or corroborated by observable market data, and, in certain instances, valuation models that utilize assumptions which cannot be corroborated with observable market data. Derivative Instruments: From time to time, HP uses forward contracts, interest rate and total return swaps and option contracts to hedge certain foreign currency and interest rate exposures. HP uses industry standard valuation models to measure fair value. Where applicable, these models project future cash flows and discount the future amounts to present value using market-based observable inputs, including interest rate curves, HP and counterparty credit risk, foreign exchange rates, and forward and spot prices for currencies and interest rates. See Note 9, “Financial Instruments” for a further discussion of HP’s use of derivative instruments. Other Fair Value Disclosures Short- and Long-Term Debt: HP estimates the fair value of its debt primarily using an expected present value technique, which is based on observable market inputs using interest rates currently available to companies of similar credit standing for similar terms and remaining maturities, and considering its own credit risk. The portion of HP’s debt that is hedged is reflected in the Consolidated Condensed Balance Sheets as an amount equal to the debt’s carrying amount and a fair value adjustment representing changes in the fair value of the hedged debt obligations arising from movements in benchmark interest rates. The fair value of HP’s short- and long-term debt was $7.3 billion as of July 31, 2018, compared to its carrying amount of $7.2 billion at that date. The fair value of HP’s short- and long-term debt was $8.1 billion as of October 31, 2017, compared to its carrying value of $7.8 billion at that date. If measured at fair value in the Consolidated Condensed Balance Sheets, short and long-term debt would be classified in Level 2 of the fair value hierarchy. Other Financial Instruments: For the balance of HP’s financial instruments, primarily accounts receivable, accounts payable and financial liabilities included in Other accrued liabilities on the Consolidated Condensed Balance Sheets, the carrying amounts approximate fair value due to their short maturities. If measured at fair value in the Consolidated Condensed Balance Sheets, these other financial instruments would be classified in Level 2 or Level 3 of the fair value hierarchy. Non-Marketable Equity Investments and Non-Financial Assets: HP’s non-marketable equity investments and non-financial assets, such as goodwill, intangible assets and property, plant and equipment, are recorded at fair value in the period of acquisition and a subsequent impairment charge is recognized. If measured at fair value in the Consolidated Condensed Balance Sheets, non-marketable equity investments and non-financial assets would generally be classified within Level 3 of the fair value hierarchy. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. Fair Value Hierarchy HP uses valuation techniques that are based upon observable and unobservable inputs. Observable inputs are developed using market data such as publicly available information and reflect the assumptions market participants would use, while unobservable inputs are developed using the best information available about the assumptions market participants would use. Assets and liabilities are classified in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement: Level 1—Quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2—Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and market-corroborated inputs. Level 3—Unobservable inputs for the asset or liability. The fair value hierarchy gives the highest priority to observable inputs and lowest priority to unobservable inputs.
Cash Equivalents and Available-for-Sale Investments	All highly liquid investments with original maturities of three months or less at the date of acquisition are considered cash equivalents.
Debt and Marketable Equity Securities	Equity securities in privately held companies include cost basis and equity method investments and are included in Other non-current assets on the Consolidated Condensed Balance Sheets.
Financial Instruments	Derivative Instruments HP uses derivatives to offset business exposure to foreign currency and interest rate risk on expected future cash flows and on certain existing assets and liabilities. As part of its risk management strategy, HP uses derivative instruments, primarily forward contracts, interest rate swaps, total return swaps and, at times, option contracts to hedge certain foreign currency, interest rate and, to a lesser extent, equity exposures. HP may designate its derivative contracts as fair value hedges or cash flow hedges and classifies the cash flows with the activities that correspond to the underlying hedged items. Additionally, for derivatives not designated as hedging instruments, HP categorizes those economic hedges as other derivatives. HP recognizes all derivative instruments at fair value in the Consolidated Condensed Balance Sheets. As a result of its use of derivative instruments, HP is exposed to the risk that its counterparties will fail to meet their contractual obligations. Master netting agreements mitigate credit exposure to counterparties by permitting HP to net amounts due from HP to counterparty against amounts due to HP from the same counterparty under certain conditions. To further limit credit risk, HP has collateral security agreements that allow HP to hold collateral from, or require HP to post collateral to, counterparties when aggregate derivative fair values exceed contractually established thresholds which are generally based on the credit ratings of HP and its counterparties. If HP’s or the counterparty’s credit rating falls below a specified credit rating, either party has the right to request full collateralization of the derivatives’ net liability position. The fair value of derivatives with credit contingent features in a net liability position was $108 million and $258 million as of July 31, 2018 and as of October 31, 2017, respectively, all of which were fully collateralized within two business days. Under HP’s derivative contracts, the counterparty can terminate all outstanding trades following a covered change of control event affecting HP that results in the surviving entity being rated below a specified credit rating. This credit contingent provision did not affect HP’s financial position or cash flows as of July 31, 2018 and October 31, 2017. Fair Value Hedges HP enters into fair value hedges, such as interest rate swaps, to reduce the exposure of its debt portfolio to changes in fair value resulting from changes in interest rates by achieving a primarily U.S. dollar London Interbank Offered Rate (“LIBOR”)-based floating interest expense. For derivative instruments that are designated and qualify as fair value hedges, HP recognizes the change in fair value of the derivative instrument, as well as the offsetting change in the fair value of the hedged item, in Interest and other, net on the Consolidated Condensed Statements of Earnings in the period of change. Cash Flow Hedges HP uses forward contracts and at times, option contracts designated as cash flow hedges to protect against the foreign currency exchange rate risks inherent in its forecasted net revenue and, to a lesser extent, cost of revenue, operating expenses, and intercompany loans denominated in currencies other than the U.S. dollar. HP’s foreign currency cash flow hedges mature generally within twelve months. However, hedges related to longer-term procurement arrangements extend several years and forward contracts associated with intercompany loans extend for the duration of the loan term, which typically range from two to five years. For derivative instruments that are designated and qualify as cash flow hedges, HP initially records changes in fair value for the effective portion of the derivative instrument in accumulated other comprehensive loss as a separate component of stockholders’ deficit on the Consolidated Condensed Balance Sheets and subsequently reclassifies these amounts into earnings in the period during which the hedged transaction is recognized in earnings. HP reports the effective portion of its cash flow hedges in the same financial statement line item as the hedged transaction. Other Derivatives Other derivatives not designated as hedging instruments consist primarily of forward contracts used to hedge foreign currency-denominated balance sheet exposures. HP uses total return swaps to hedge its executive deferred compensation plan liability. For derivative instruments not designated as hedging instruments, HP recognizes changes in fair value of the derivative instrument in Interest and other, net in the Consolidated Condensed Statements of Earnings in the period of change. Hedge Effectiveness For interest rate swaps designated as fair value hedges, HP measures hedge effectiveness by offsetting the change in fair value of the hedged item with the change in fair value of the derivative. For foreign currency options and forward contracts designated as cash flow hedges, HP measures hedge effectiveness by comparing the cumulative change in fair value of the hedge contract with the cumulative change in fair value of the hedged item, both of which are based on forward rates. HP recognizes any ineffective portion of the hedge in the Consolidated Condensed Statements of Earnings in the same period in which ineffectiveness occurs. Amounts excluded from the assessment of effectiveness are recognized in the Consolidated Condensed Statements of Earnings in the period they arise.
Offsetting of Derivatives Instruments	Offsetting of Derivative Instruments HP recognizes all derivative instruments on a gross basis in the Consolidated Condensed Balance Sheets. HP does not offset the fair value of its derivative instruments against the fair value of cash collateral posted under its collateral security agreements.
Net Earnings Per Share	HP calculates basic net EPS using net earnings and the weighted-average number of shares outstanding during the reporting period. Diluted net EPS includes any dilutive effect of restricted stock awards, stock options, performance-based awards and shares purchased under the 2011 employee stock purchase plan.
Litigation and Contingencies	HP is involved in lawsuits, claims, investigations and proceedings, including those identified below, consisting of intellectual property, commercial, securities, employment, employee benefits and environmental matters that arise in the ordinary course of business. HP accrues a liability when management believes that it is both probable that a liability has been incurred and the amount of loss can be reasonably estimated. HP believes it has recorded adequate provisions for any such matters and, as of July 31, 2018, it was not reasonably possible that a material loss had been incurred in excess of the amounts recognized in HP’s financial statements. HP reviews these matters at least quarterly and adjusts its accruals to reflect the impact of negotiations, settlements, rulings, advice of legal counsel, and other information and events pertaining to a particular case. Pursuant to the separation and distribution agreement, HP shares responsibility with Hewlett Packard Enterprise for certain matters, as indicated below, and Hewlett Packard Enterprise has agreed to indemnify HP in whole or in part with respect to certain matters. Based on its experience, HP believes that any damage amounts claimed in the specific matters discussed below are not a meaningful indicator of HP’s potential liability. Litigation is inherently unpredictable. However, HP believes it has valid defenses with respect to legal matters pending against it. Nevertheless, cash flows or results of operations could be materially affected in any particular period by the resolution of one or more of these contingencies.
Warranties	Warranties HP accrues the estimated cost of product warranties at the time it recognizes revenue. HP engages in extensive product quality programs and processes, including actively monitoring and evaluating the quality of its component suppliers; however, contractual warranty terms, repair costs, product call rates, average cost per call, current period product shipments and ongoing product failure rates, as well as specific product class failures outside of HP’s baseline experience, affect the estimated warranty obligation.