Taxes on Earnings	9 Months Ended
Taxes on Earnings	Jul. 31, 2020
Income Tax Disclosure [Abstract]
Taxes on Earnings	Taxes on Earnings Provision for Taxes HP’s effective tax rate was 2.2% and (375.4)% for the three months ended July 31, 2020 and 2019, respectively and 11.4% and (36.1)% for the nine months ended July 31, 2020 and 2019, respectively. The difference between the U.S. federal statutory tax rate of 21% and HP’s effective tax rate for the three and nine months ended July 31, 2020 is primarily due to audit settlements in various jurisdictions and favorable tax rates associated with certain earnings from HP’s operations in lower-tax jurisdictions throughout the world. For the three and nine months ended July 31, 2019, HP’s effective tax rate generally differs from the U.S. federal statutory rate of 21% primarily due to the resolution of various audits, transitional impacts of U.S. tax reform, and favorable tax rates associated with certain earnings from HP’s operations in lower-tax jurisdictions throughout the world. During the three and nine months ended July 31, 2020, HP recorded $116 million and $182 million, respectively, of net tax benefits related to discrete items in the provision for taxes. These amounts included tax benefits of $102 million and $143 million related to audit settlements in various jurisdictions, $20 million and $75 million related to restructuring charges, and $4 million and $20 million related to acquisition charges for the three and nine months ended July 31, 2020, respectively. These benefits were partially offset by uncertain tax position charges of $3 million and $54 million for the three and nine months ended July 31, 2020, respectively. For the nine months ended July 31, 2020, excess tax benefits associated with stock options, restricted stock units and performance-adjusted restricted stock units were immaterial. During the three and nine months ended July 31, 2019, HP recorded $1.1 billion of net income tax benefits related to discrete items in the provision for taxes. This amount included tax benefits of $1.0 billion related to various audit settlements, $75 million due to the ability to utilize tax attributes, along with $57 million and $78 million for the three and nine months ended July 31, 2019, respectively, related to U.S. tax reform as a result of new guidance issued by the U.S. Internal Revenue Service (“IRS”). These benefits were partially offset by valuation allowance charges of $98 million for the three and nine months ended July 31, 2019. In addition to the discrete items mentioned above, HP recorded excess tax benefits of $21 million associated with stock options, restricted stock units and performance-adjusted restricted stock units for the nine months ended July 31, 2019. Uncertain Tax Positions As of July 31, 2020, the amount of gross unrecognized tax benefits was $824 million, of which up to $680 million would affect HP’s effective tax rate if realized. Total gross unrecognized tax benefits decreased by $105 million for the nine months ended July 31, 2020, 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, 2020 and 2019, HP had accrued $37 million and $75 million, respectively, 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. HP believes it is reasonably possible that its existing gross unrecognized tax benefits may be reduced by up to $80 million within the next 12 months, affecting HP’s effective tax rate if realized. 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 IRS is conducting an audit of HP’s 2018 and 2019 income tax returns.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.