Taxes on Earnings	9 Months Ended
Jul. 31, 2018
Income Tax Disclosure [Abstract]
Taxes on Earnings	Taxes on Earnings Provision for Taxes On December 22, 2017, the TCJA was signed by the President of the United States and enacted into law. The law includes significant changes to the U.S. corporate income tax system, including a federal corporate rate reduction from 35% to 21%, limitations on the deductibility of interest expense and executive compensation, and the transition of U.S. international taxation from a worldwide tax system to a territorial tax system. ASC 740, Accounting for Income Taxes, requires companies to recognize the effect of tax law changes in the period of enactment even though the effective date for most provisions is for tax years beginning after December 31, 2017 (the “Effective Date”), or in the case of certain other provisions, January 1, 2018. When a U.S. federal tax rate change occurs during a fiscal year, taxpayers are required to compute a weighted daily average rate for the fiscal year of enactment. As a result of the TCJA, HP has calculated a blended U.S. federal statutory corporate income tax rate of 23% for the fiscal year ending October 31, 2018 and applied this rate in computing the first, second and third quarters’ income tax provision for fiscal year 2018. The blended U.S. federal statutory corporate income tax rate of 23% is the weighted daily average rate between the pre-enactment U.S. federal statutory tax rate of 35% applicable to HP’s 2018 fiscal year prior to the Effective Date and the post-enactment U.S. federal statutory tax rate of 21% applicable to the 2018 fiscal year thereafter. HP expects the U.S. federal statutory rate to be 21% for fiscal years beginning after October 31, 2018. Given the significance of the legislation, the SEC staff issued Staff Accounting Bulletin No. 118 (SAB 118), which allows registrants to record provisional amounts during a one year “measurement period”. During the measurement period, impacts of the TCJA are expected to be recorded at the time a reasonable estimate for all or a portion of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared or analyzed. SAB 118 summarizes a three-step process to be applied at each reporting period to account for and qualitatively disclose: (1) the effects of the change in tax law for which accounting is complete; (2) provisional amounts (or adjustments to provisional amounts) for the effects of the tax law where accounting is not complete, but that a reasonable estimate has been determined; and (3) a reasonable estimate cannot yet be made and therefore taxes are reflected in accordance with law prior to the enactment of the TCJA. As of July 31, 2018, HP has not completed its accounting for the tax effects of the TCJA, however, in certain cases HP has made a reasonable estimate of the effects for remeasurement on its existing deferred tax balances and the one-time transition tax. With respect to the Global Intangible Low Taxed Income (“Global Minimum Tax”) provisions, further discussed below, HP has not been able to make a reasonable estimate and continues to account for this item based on its existing accounting under ASC 740, Income Taxes, and the provisions of the tax laws that were in effect immediately prior to enactment. The impact of the TCJA may differ materially from this estimate due to changes in interpretations and assumptions HP has made, additional guidance that may be issued and actions HP may take as a result of the TCJA. The impacts of HP's estimates are described further below. While HP has not yet completed its analysis to the impact on its deferred tax balances, in the first quarter of fiscal year 2018 HP recorded provisional income tax expense of $1.2 billion related to the remeasurement of its deferred tax assets and liabilities at the new statutory rate. In addition, in the second quarter of fiscal year 2018, due to additional information and a subsequent refinement of its analysis HP recorded provisional tax expense of $379 million related to remeasurement of its U.S. deferred tax assets that are expected to be realized at a lower rate by recording a valuation allowance. HP is still analyzing certain aspects of the TCJA and refining its calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The TCJA also includes a one-time mandatory deemed repatriation transition tax on the net accumulated post-1986 earnings and profits (“E&P”) of a U.S. taxpayer’s foreign subsidiaries. HP has computed a provisional deemed repatriation tax of approximately $3.1 billion, of which more than half is expected to be offset with existing and future tax attributes, reducing HP’s cash outlay. The U.S. Treasury Department recently issued proposed regulations related to this one-time mandatory deemed repatriation. While HP has not yet completed its analysis of these proposed regulations, it believes there will be no material changes to its provisional amount reported earlier in the year. Once the regulations are in effect or HP completes its evaluation of the potential impact of the proposed regulations, HP may update its provisional amount accordingly within the measurement period. Companies may elect to pay this tax over 8 years, and HP intends to make this election. HP has not yet completed its calculation of the total post-1986 E&P for its foreign subsidiaries. Further, the transition tax is based, in part, on the amount of those earnings held in cash and other specified assets. This amount may change when HP finalizes the calculation of post-1986 E&P previously deferred from U.S. federal taxation and finalizes the amounts held in cash or other specified assets. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax, or any additional outside basis difference inherent in these entities, as these amounts continue to be indefinitely reinvested in foreign operations. As a result of the deemed repatriation tax noted above, which is based on HP’s total post-1986 deferred foreign income, HP redetermined $5.5 billion of its U.S. deferred tax liability on those unremitted earnings with a provisional tax payable of $3.1 billion, as noted above. This resulted in a net benefit. This tax benefit is provisional as HP is still analyzing certain aspects of the legislation and refining calculations, which could potentially materially affect the measurement of these amounts. Upon further analysis of certain aspects of the TCJA and refinement of the calculations during the three months ended July 31, 2018, HP has made certain immaterial adjustments to its provisional estimate due to additional tax charges resulting from state legislation updates. During the nine months ended July 31, 2018, HP remeasured its deferred taxes to reflect the reduced rate that will likely apply when these deferred taxes are settled or realized in future periods. HP has not yet completed the accounting for the remeasurement of deferred taxes. To calculate the remeasurement of deferred taxes, HP has estimated when the existing deferred taxes will be settled or realized. The remeasurement of deferred taxes included in the financial statements will be subject to further revisions if the current estimates are different from the actual future operating results. In January 2018, the FASB released guidance on the accounting for tax on the Global Minimum Tax provisions of TCJA. The Global Minimum Tax provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to Global Minimum Tax inclusions or to treat any taxes on Global Minimum Tax inclusions as period cost are both acceptable methods subject to an accounting policy election. HP is still evaluating whether to make a policy election to treat the Global Minimum Tax as a period cost or to provide U.S. deferred taxes on foreign temporary differences that are expected to generate Global Minimum Tax income when they reverse in future years. There could be additional changes to HP's deferred taxes once it completes its evaluations. As a result of U.S. tax reform, HP revised its estimated annual effective tax rate to reflect the change in the U.S. federal statutory tax rate from 35% to 21%. Since HP has a fiscal year ending October 31, it is subject to transitional tax rate rules. Therefore, a blended rate of 23% was computed as effective for the current fiscal year. HP’s effective tax rate was 13.6% and 22.5% for the three months ended July 31, 2018 and 2017, respectively, and (93.2%) and 23.1% for the nine months ended July 31, 2018 and 2017, respectively. The difference between the current fiscal year blended U.S. federal statutory tax rate of 23% and HP’s effective tax rate for the three and nine months ended July 31, 2018 is primarily due to favorable tax rates associated with certain earnings from HP’s operations in lower-tax jurisdictions throughout the world and, for the nine month period only, transitional impacts of U.S. tax reform and resolution of various audits and tax litigation. For the three and nine months ended July 31, 2017, HP’s effective tax rate generally differs from the U.S. federal statutory rate of 35% due to favorable tax rates associated with certain earnings from HP’s operations in lower-tax jurisdictions throughout the world. HP has not provided U.S. taxes for all foreign earnings because HP plans to reinvest some of those earnings indefinitely outside the United States. During the three and nine months ended July 31, 2018, HP recorded $7.0 million and $2.2 billion, respectively, of net tax benefits related to discrete items in the provision for taxes. As noted above, HP has not yet completed its analysis of the full impact of TCJA. However, for the three months ended January 31, 2018, HP recorded a provisional tax benefit of $1.1 billion related to $5.5 billion net benefit for the decrease in its deferred tax liability on unremitted foreign earnings, partially offset by $3.2 billion net expense for the deemed repatriation tax payable in installments over eight years and $1.2 billion net expense for the remeasurement of its deferred assets and liabilities to the new U.S. statutory tax rate. For the three months ended April 30, 2018, HP recorded provisional tax expense of $379 million related to remeasurement of its U.S. deferred tax assets that are expected to be realized at a lower rate and a $43 million tax benefit as an adjustment to the provisional deemed repatriation tax amount due to further analysis and additional guidance. For the three months ended July 31, 2018, HP recorded net tax benefits of $12 million related to acquisition costs offset by other charges of $5 million. The nine months ended July 31, 2018 also included tax benefits related to audit settlements of $1.5 billion, loss on debt extinguishment of $33 million, acquisition costs of $13 million and other tax benefits of $10 million. These tax benefits were offset by uncertain tax position charges of $56 million. During the three and nine months ended July 31, 2018, in addition to the discrete items mentioned above, HP recorded excess tax benefits of $2 million and $36 million, respectively, on stock options, restricted stock units and performance-adjusted restricted stock units. During the three and nine months ended July 31, 2017, HP recorded $27 million and $31 million, respectively, of net tax benefit related to discrete items in the provision for taxes for continuing operations. These amounts included a tax benefit of $14 million and $45 million related to restructuring and other charges, and a tax benefit of $15 million and $28 million related to acquisition-related charges, offset by uncertain tax position charges of $19 million and $25 million, for the three and nine months ended July 31, 2017, respectively. The three months and nine months ended July 31, 2017 included a net tax benefit of $12 million related to provision to return adjustments due to the filing of HP’s U.S. Federal tax return. The nine months ended July 31, 2017 also included a tax charge of $26 million related to state provision to return adjustments. Uncertain Tax Positions As of July 31, 2018, the amount of unrecognized tax benefits was $8.0 billion, of which up to $1.7 billion would affect HP’s effective tax rate if realized. The amount of unrecognized tax benefits decreased by $2.8 billion for the nine months ended July 31, 2018, primarily related to the resolution of various audits. 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. As of July 31, 2018, HP had accrued $149 million for interest and penalties. HP engages in continuous discussions and negotiations with taxing authorities regarding tax matters in various jurisdictions. HP expects to complete resolution of certain tax years with various tax authorities within the next 12 months. It is also possible that other federal, foreign and state tax issues may be concluded within the next 12 months. HP believes it is reasonably possible that its existing unrecognized tax benefits may be reduced by up to $6.4 billion within the next 12 months. These unrecognized tax benefits have associated gain contingencies which will be settled in the same period resulting in a net release of $822 million. HP is subject to income tax in the United States and approximately 58 other countries and is subject to routine corporate income tax audits in many of these jurisdictions. In addition, HP is subject to numerous ongoing audits by federal, state and foreign tax authorities. The U.S. Internal Revenue Service is conducting an audit of HP’s 2013, 2014 and 2015 income tax returns.

Taxes on Earnings

Provision for Taxes

On December 22, 2017, the TCJA was signed by the President of the United States and enacted into law. The law includes significant changes to the U.S. corporate income tax system, including a federal corporate rate reduction from 35% to 21%, limitations on the deductibility of interest expense and executive compensation, and the transition of U.S. international taxation from a worldwide tax system to a territorial tax system. ASC 740, Accounting for Income Taxes, requires companies to recognize the effect of tax law changes in the period of enactment even though the effective date for most provisions is for tax years beginning after December 31, 2017 (the “Effective Date”), or in the case of certain other provisions, January 1, 2018.

When a U.S. federal tax rate change occurs during a fiscal year, taxpayers are required to compute a weighted daily average rate for the fiscal year of enactment. As a result of the TCJA, HP has calculated a blended U.S. federal statutory corporate income tax rate of 23% for the fiscal year ending October 31, 2018 and applied this rate in computing the first, second and third quarters’ income tax provision for fiscal year 2018. The blended U.S. federal statutory corporate income tax rate of 23% is the weighted daily average rate between the pre-enactment U.S. federal statutory tax rate of 35% applicable to HP’s 2018 fiscal year prior to the Effective Date and the post-enactment U.S. federal statutory tax rate of 21% applicable to the 2018 fiscal year thereafter. HP expects the U.S. federal statutory rate to be 21% for fiscal years beginning after October 31, 2018.

Given the significance of the legislation, the SEC staff issued Staff Accounting Bulletin No. 118 (SAB 118), which allows registrants to record provisional amounts during a one year “measurement period”. During the measurement period, impacts of the TCJA are expected to be recorded at the time a reasonable estimate for all or a portion of the effects can be made, and provisional amounts can be recognized and adjusted as information becomes available, prepared or analyzed.

SAB 118 summarizes a three-step process to be applied at each reporting period to account for and qualitatively disclose: (1) the effects of the change in tax law for which accounting is complete; (2) provisional amounts (or adjustments to provisional amounts) for the effects of the tax law where accounting is not complete, but that a reasonable estimate has been determined; and (3) a reasonable estimate cannot yet be made and therefore taxes are reflected in accordance with law prior to the enactment of the TCJA.

As of July 31, 2018, HP has not completed its accounting for the tax effects of the TCJA, however, in certain cases HP has made a reasonable estimate of the effects for remeasurement on its existing deferred tax balances and the one-time transition tax. With respect to the Global Intangible Low Taxed Income (“Global Minimum Tax”) provisions, further discussed below, HP has not been able to make a reasonable estimate and continues to account for this item based on its existing accounting under ASC 740, Income Taxes, and the provisions of the tax laws that were in effect immediately prior to enactment. The impact of the TCJA may differ materially from this estimate due to changes in interpretations and assumptions HP has made, additional guidance that may be issued and actions HP may take as a result of the TCJA. The impacts of HP's estimates are described further below.

While HP has not yet completed its analysis to the impact on its deferred tax balances, in the first quarter of fiscal year 2018 HP recorded provisional income tax expense of $1.2 billion related to the remeasurement of its deferred tax assets and liabilities at the new statutory rate. In addition, in the second quarter of fiscal year 2018, due to additional information and a subsequent refinement of its analysis HP recorded provisional tax expense of $379 million related to remeasurement of its U.S. deferred tax assets that are expected to be realized at a lower rate by recording a valuation allowance. HP is still analyzing certain aspects of the TCJA and refining its calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts.

The TCJA also includes a one-time mandatory deemed repatriation transition tax on the net accumulated post-1986 earnings and profits (“E&P”) of a U.S. taxpayer’s foreign subsidiaries. HP has computed a provisional deemed repatriation tax of approximately $3.1 billion, of which more than half is expected to be offset with existing and future tax attributes, reducing HP’s cash outlay. The U.S. Treasury Department recently issued proposed regulations related to this one-time mandatory deemed repatriation. While HP has not yet completed its analysis of these proposed regulations, it believes there will be no material changes to its provisional amount reported earlier in the year. Once the regulations are in effect or HP completes its evaluation of the potential impact of the proposed regulations, HP may update its provisional amount accordingly within the measurement period. Companies may elect to pay this tax over 8 years, and HP intends to make this election. HP has not yet completed its calculation of the total post-1986 E&P for its foreign subsidiaries. Further, the transition tax is based, in part, on the amount of those earnings held in cash and other specified assets. This amount may change when HP finalizes the calculation of post-1986 E&P previously deferred from U.S. federal taxation and finalizes the amounts held in cash or other specified assets. No additional income taxes have been provided for any remaining undistributed foreign earnings not subject to the transition tax, or any additional outside basis difference inherent in these entities, as these amounts continue to be indefinitely reinvested in foreign operations.

As a result of the deemed repatriation tax noted above, which is based on HP’s total post-1986 deferred foreign income, HP redetermined $5.5 billion of its U.S. deferred tax liability on those unremitted earnings with a provisional tax payable of $3.1 billion, as noted above. This resulted in a net benefit. This tax benefit is provisional as HP is still analyzing certain aspects of the legislation and refining calculations, which could potentially materially affect the measurement of these amounts.

Upon further analysis of certain aspects of the TCJA and refinement of the calculations during the three months ended July 31, 2018, HP has made certain immaterial adjustments to its provisional estimate due to additional tax charges resulting from state legislation updates. During the nine months ended July 31, 2018, HP remeasured its deferred taxes to reflect the reduced rate that will likely apply when these deferred taxes are settled or realized in future periods. HP has not yet completed the accounting for the remeasurement of deferred taxes. To calculate the remeasurement of deferred taxes, HP has estimated when the existing deferred taxes will be settled or realized. The remeasurement of deferred taxes included in the financial statements will be subject to further revisions if the current estimates are different from the actual future operating results.

In January 2018, the FASB released guidance on the accounting for tax on the Global Minimum Tax provisions of TCJA. The Global Minimum Tax provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to Global Minimum Tax inclusions or to treat any taxes on Global Minimum Tax inclusions as period cost are both acceptable methods subject to an accounting policy election. HP is still evaluating whether to make a policy election to treat the Global Minimum Tax as a period cost or to provide U.S. deferred taxes on foreign temporary differences that are expected to generate Global Minimum Tax income when they reverse in future years. There could be additional changes to HP's deferred taxes once it completes its evaluations.

As a result of U.S. tax reform, HP revised its estimated annual effective tax rate to reflect the change in the U.S. federal statutory tax rate from 35% to 21%. Since HP has a fiscal year ending October 31, it is subject to transitional tax rate rules. Therefore, a blended rate of 23% was computed as effective for the current fiscal year. HP’s effective tax rate was 13.6% and 22.5% for the three months ended July 31, 2018 and 2017, respectively, and (93.2%) and 23.1% for the nine months ended July 31, 2018 and 2017, respectively. The difference between the current fiscal year blended U.S. federal statutory tax rate of 23% and HP’s effective tax rate for the three and nine months ended July 31, 2018 is primarily due to favorable tax rates associated with certain earnings from HP’s operations in lower-tax jurisdictions throughout the world and, for the nine month period only, transitional impacts of U.S. tax reform and resolution of various audits and tax litigation. For the three and nine months ended July 31, 2017, HP’s effective tax rate generally differs from the U.S. federal statutory rate of 35% due to favorable tax rates associated with certain earnings from HP’s operations in lower-tax jurisdictions throughout the world. HP has not provided U.S. taxes for all foreign earnings because HP plans to reinvest some of those earnings indefinitely outside the United States.

During the three and nine months ended July 31, 2018, HP recorded $7.0 million and $2.2 billion, respectively, of net tax benefits related to discrete items in the provision for taxes. As noted above, HP has not yet completed its analysis of the full impact of TCJA. However, for the three months ended January 31, 2018, HP recorded a provisional tax benefit of $1.1 billion related to $5.5 billion net benefit for the decrease in its deferred tax liability on unremitted foreign earnings, partially offset by $3.2 billion net expense for the deemed repatriation tax payable in installments over eight years and $1.2 billion net expense for the remeasurement of its deferred assets and liabilities to the new U.S. statutory tax rate. For the three months ended April 30, 2018, HP recorded provisional tax expense of $379 million related to remeasurement of its U.S. deferred tax assets that are expected to be realized at a lower rate and a $43 million tax benefit as an adjustment to the provisional deemed repatriation tax amount due to further analysis and additional guidance. For the three months ended July 31, 2018, HP recorded net tax benefits of $12 million related to acquisition costs offset by other charges of $5 million. The nine months ended July 31, 2018 also included tax benefits related to audit settlements of $1.5 billion, loss on debt extinguishment of $33 million, acquisition costs of $13 million and other tax benefits of $10 million. These tax benefits were offset by uncertain tax position charges of $56 million. During the three and nine months ended July 31, 2018, in addition to the discrete items mentioned above, HP recorded excess tax benefits of $2 million and $36 million, respectively, on stock options, restricted stock units and performance-adjusted restricted stock units.

During the three and nine months ended July 31, 2017, HP recorded $27 million and $31 million, respectively, of net tax benefit related to discrete items in the provision for taxes for continuing operations. These amounts included a tax benefit of $14 million and $45 million related to restructuring and other charges, and a tax benefit of $15 million and $28 million related to acquisition-related charges, offset by uncertain tax position charges of $19 million and $25 million, for the three and nine months ended July 31, 2017, respectively. The three months and nine months ended July 31, 2017 included a net tax benefit of $12 million related to provision to return adjustments due to the filing of HP’s U.S. Federal tax return. The nine months ended July 31, 2017 also included a tax charge of $26 million related to state provision to return adjustments.

Uncertain Tax Positions

As of July 31, 2018, the amount of unrecognized tax benefits was $8.0 billion, of which up to $1.7 billion would affect HP’s effective tax rate if realized. The amount of unrecognized tax benefits decreased by $2.8 billion for the nine months ended July 31, 2018, primarily related to the resolution of various audits. 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. As of July 31, 2018, HP had accrued $149 million for interest and penalties.

HP engages in continuous discussions and negotiations with taxing authorities regarding tax matters in various jurisdictions. HP expects to complete resolution of certain tax years with various tax authorities within the next 12 months. It is also possible that other federal, foreign and state tax issues may be concluded within the next 12 months. HP believes it is reasonably possible that its existing unrecognized tax benefits may be reduced by up to $6.4 billion within the next 12 months. These unrecognized tax benefits have associated gain contingencies which will be settled in the same period resulting in a net release of $822 million.

HP is subject to income tax in the United States and approximately 58 other countries and is subject to routine corporate income tax audits in many of these jurisdictions. In addition, HP is subject to numerous ongoing audits by federal, state and foreign tax authorities. The U.S. Internal Revenue Service is conducting an audit of HP’s 2013, 2014 and 2015 income tax returns.