Taxes on Earnings - Uncertain Tax Positions (Narrative) (Details) $ in Millions	12 Months Ended
Oct. 31, 2025 USD ($) country	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Oct. 31, 2022 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 865	$ 1,217	$ 1,137	$ 1,045
Unrecognized tax benefits that would affect effective tax rate if realized	656
Increase in gross unrecognized tax benefits	(352)
Accrued income tax for interest and penalties	$ 122	$ 135	$ 102
Likelihood of no resolution period	12 months
Reasonably possible decrease in existing unrecognized tax benefits within the next 12 months	$ 42
Number of other countries in which HP is subject to income taxes \| country	60
Undistributed earnings from non-U.S. operations	$ 5,100

The period of likelihood that the uncertain tax position will not be resolved.

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Represents the number of other countries in which the entity is subject to income taxes.

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount of unrecognized tax benefits.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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