Taxes on Earnings	9 Months Ended
Jul. 31, 2016
Income Tax Disclosure [Abstract]
Taxes on Earnings	Taxes on Earnings Tax Matters Agreement and Other Income Tax Matters In connection with the Separation, HP entered into the TMA with Hewlett Packard Enterprise, effective on November 1, 2015, that governs the rights and obligations of HP and Hewlett Packard Enterprise for certain pre-Separation tax liabilities. The TMA provides that HP and Hewlett Packard Enterprise will share certain pre-Separation income tax liabilities. In certain jurisdictions, HP and Hewlett Packard Enterprise have joint and several liability for past income tax liabilities and accordingly, HP could be legally liable under applicable tax law for such liabilities and required to make additional tax payments. In addition, if the distribution of Hewlett Packard Enterprise's common shares to the HP stockholders is determined to be taxable, Hewlett Packard Enterprise and HP would share the tax liability equally, unless the taxability of the distribution is the direct result of action taken by either Hewlett Packard Enterprise or HP subsequent to the distribution, in which case the party causing the distribution to be taxable would be responsible for any taxes imposed on the distribution. Upon completion of the Separation on November 1, 2015, HP recorded income tax indemnification receivables from Hewlett Packard Enterprise for certain income tax liabilities that HP is jointly and severally liable for, but for which it is indemnified by Hewlett Packard Enterprise under the TMA. The actual amount that Hewlett Packard Enterprise may be obligated to pay HP could vary depending upon the outcome of certain unresolved tax matters, which may not be resolved for several years. The net receivable as of July 31, 2016 was $1.1 billion. Provision for Taxes HP's effective tax rate for continuing operations was 22.0% and 23.7% for the three months ended July 31, 2016 and 2015, respectively, and 21.7% and 22.2% for the nine months ended July 31, 2016 and 2015, respectively. 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 U.S. In the three and nine months ended July 31, 2016, HP recorded discrete items resulting in net tax expense of $14 million and net tax benefit of $72 million, respectively, for continuing operations. These amounts included a tax benefit of $8 million and $46 million, for the three and nine months ended July 31, 2016, respectively, on restructuring and other charges. The nine months ended July 31, 2016 also included a tax benefit of $41 million arising from the retroactive research and development credit provided by the Consolidated Appropriations Act of 2016 signed into law in December 2015. In the three and nine months ended July 31, 2015, HP recorded discrete items resulting in net tax expense of $28 million and $12 million, respectively. These amounts included a tax benefit of $1 million and $8 million for the three and nine months ended July 31, 2015, respectively, on restructuring and other charges, and tax expense of $7 million and $36 million for the three and nine months ended July 31, 2015, respectively, related to provision to return adjustments and other tax expense of $22 million and $12 million for the three and nine months ended July 31, 2015, respectively. The nine months ended July 31, 2015 also included a tax benefit of $28 million arising from the retroactive research and development credit provided by the Tax Increase Prevention Act of 2014 signed into law in December 2014. Uncertain Tax Positions As of July 31, 2016, the amount of unrecognized tax benefits was $9.6 billion, of which up to $3.4 billion would affect HP's effective tax rate if realized. The amount of unrecognized tax benefits increased by $385 million for the nine months ended July 31, 2016, primarily related to advanced royalty payments, the majority of which are indemnified by Hewlett Packard Enterprise. HP continues to record its tax liabilities related to uncertain tax positions and certain liabilities for which it has joint and several liability with Hewlett Packard Enterprise. During the nine months ended July 31, 2016, as part of the Separation, HP distributed liabilities related solely to uncertain tax positions associated with Hewlett Packard Enterprise aggregating $732 million. HP and Hewlett Packard Enterprise have contractually agreed to share the responsibility of certain tax exposures, and as such have recorded indemnification assets and liabilities pursuant to the TMA. 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, 2016, HP had accrued $153 million for interest and penalties. HP engages in continuous discussion and negotiation with taxing authorities regarding tax matters in various jurisdictions. HP does not expect complete resolution of any IRS audit cycle within the next 12 months. However, it is reasonably possible that certain federal, foreign and state tax issues may be concluded in the next 12 months, including issues involving transfer pricing and other matters. Accordingly, HP believes it is reasonably possible that its existing unrecognized tax benefits may be reduced by an amount up to $5 million within the next 12 months. Deferred Tax Assets and Liabilities In 2015, the FASB issued Accounting Standards Update ("ASU") 2015-17, "Balance Sheet Classification of Deferred Taxes", which simplifies the presentation of deferred income taxes. This guidance requires that deferred tax liabilities and assets be classified as non-current in a classified statement of financial position. HP early adopted the FASB's new accounting guidance prospectively for the interim period beginning November 1, 2015; thus, the prior reporting period was not retrospectively adjusted. HP periodically engages in intercompany advanced royalty payment arrangements that may result in advance payments between subsidiaries in different tax jurisdictions. When the local tax treatment of the intercompany licensing arrangements differs from U.S. GAAP treatment, deferred taxes are recognized. During the nine months ended July 31, 2016, HP executed intercompany advanced royalty payment arrangements resulting in advanced payments of $1.1 billion. During fiscal 2015, HP executed an intercompany advanced royalty payment arrangement which resulted in advanced payments of $3.8 billion, with a deferral of intercompany revenues over the term of the arrangements, which is approximately 5 years. There was no recognition of any net U.S. deferred tax assets as a result of this transaction. In these transactions, the payments were received in the U.S. from a foreign consolidated affiliate, with a deferral of intercompany revenues over the term of the arrangement, which is approximately 5 years. Intercompany royalty revenue is eliminated in consolidation.

Taxes on Earnings

Tax Matters Agreement and Other Income Tax Matters

In connection with the Separation, HP entered into the TMA with Hewlett Packard Enterprise, effective on November 1, 2015, that governs the rights and obligations of HP and Hewlett Packard Enterprise for certain pre-Separation tax liabilities. The TMA provides that HP and Hewlett Packard Enterprise will share certain pre-Separation income tax liabilities. In certain jurisdictions, HP and Hewlett Packard Enterprise have joint and several liability for past income tax liabilities and accordingly, HP could be legally liable under applicable tax law for such liabilities and required to make additional tax payments.

In addition, if the distribution of Hewlett Packard Enterprise's common shares to the HP stockholders is determined to be taxable, Hewlett Packard Enterprise and HP would share the tax liability equally, unless the taxability of the distribution is the direct result of action taken by either Hewlett Packard Enterprise or HP subsequent to the distribution, in which case the party causing the distribution to be taxable would be responsible for any taxes imposed on the distribution.

Upon completion of the Separation on November 1, 2015, HP recorded income tax indemnification receivables from Hewlett Packard Enterprise for certain income tax liabilities that HP is jointly and severally liable for, but for which it is indemnified by Hewlett Packard Enterprise under the TMA. The actual amount that Hewlett Packard Enterprise may be obligated to pay HP could vary depending upon the outcome of certain unresolved tax matters, which may not be resolved for several years. The net receivable as of July 31, 2016 was $1.1 billion.

Provision for Taxes

HP's effective tax rate for continuing operations was 22.0% and 23.7% for the three months ended July 31, 2016 and 2015, respectively, and 21.7% and 22.2% for the nine months ended July 31, 2016 and 2015, respectively. 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 U.S.

In the three and nine months ended July 31, 2016, HP recorded discrete items resulting in net tax expense of $14 million and net tax benefit of $72 million, respectively, for continuing operations. These amounts included a tax benefit of $8 million and $46 million, for the three and nine months ended July 31, 2016, respectively, on restructuring and other charges. The nine months ended July 31, 2016 also included a tax benefit of $41 million arising from the retroactive research and development credit provided by the Consolidated Appropriations Act of 2016 signed into law in December 2015.

In the three and nine months ended July 31, 2015, HP recorded discrete items resulting in net tax expense of $28 million and $12 million, respectively. These amounts included a tax benefit of $1 million and $8 million for the three and nine months ended July 31, 2015, respectively, on restructuring and other charges, and tax expense of $7 million and $36 million for the three and nine months ended July 31, 2015, respectively, related to provision to return adjustments and other tax expense of $22 million and $12 million for the three and nine months ended July 31, 2015, respectively. The nine months ended July 31, 2015 also included a tax benefit of $28 million arising from the retroactive research and development credit provided by the Tax Increase Prevention Act of 2014 signed into law in December 2014.

Uncertain Tax Positions

As of July 31, 2016, the amount of unrecognized tax benefits was $9.6 billion, of which up to $3.4 billion would affect HP's effective tax rate if realized. The amount of unrecognized tax benefits increased by $385 million for the nine months ended July 31, 2016, primarily related to advanced royalty payments, the majority of which are indemnified by Hewlett Packard Enterprise. HP continues to record its tax liabilities related to uncertain tax positions and certain liabilities for which it has joint and several liability with Hewlett Packard Enterprise. During the nine months ended July 31, 2016, as part of the Separation, HP distributed liabilities related solely to uncertain tax positions associated with Hewlett Packard Enterprise aggregating $732 million. HP and Hewlett Packard Enterprise have contractually agreed to share the responsibility of certain tax exposures, and as such have recorded indemnification assets and liabilities pursuant to the TMA. 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, 2016, HP had accrued $153 million for interest and penalties.

HP engages in continuous discussion and negotiation with taxing authorities regarding tax matters in various jurisdictions. HP does not expect complete resolution of any IRS audit cycle within the next 12 months. However, it is reasonably possible that certain federal, foreign and state tax issues may be concluded in the next 12 months, including issues involving transfer pricing and other matters. Accordingly, HP believes it is reasonably possible that its existing unrecognized tax benefits may be reduced by an amount up to $5 million within the next 12 months.

Deferred Tax Assets and Liabilities

In 2015, the FASB issued Accounting Standards Update ("ASU") 2015-17, "Balance Sheet Classification of Deferred Taxes", which simplifies the presentation of deferred income taxes. This guidance requires that deferred tax liabilities and assets be classified as non-current in a classified statement of financial position. HP early adopted the FASB's new accounting guidance prospectively for the interim period beginning November 1, 2015; thus, the prior reporting period was not retrospectively adjusted.

HP periodically engages in intercompany advanced royalty payment arrangements that may result in advance payments between subsidiaries in different tax jurisdictions. When the local tax treatment of the intercompany licensing arrangements differs from U.S. GAAP treatment, deferred taxes are recognized. During the nine months ended July 31, 2016, HP executed intercompany advanced royalty payment arrangements resulting in advanced payments of $1.1 billion. During fiscal 2015, HP executed an intercompany advanced royalty payment arrangement which resulted in advanced payments of $3.8 billion, with a deferral of intercompany revenues over the term of the arrangements, which is approximately 5 years. There was no recognition of any net U.S. deferred tax assets as a result of this transaction. In these transactions, the payments were received in the U.S. from a foreign consolidated affiliate, with a deferral of intercompany revenues over the term of the arrangement, which is approximately 5 years. Intercompany royalty revenue is eliminated in consolidation.