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Taxes on Earnings - Summary of Differences Between the U.S. Federal Statutory Income Tax Rate and Effective Tax Rate (Details)	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Differences between the U.S. federal statutory income tax rate and HP's effective tax rate
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	0.70%	0.90%	(0.10%)
Lower rates in other jurisdictions, net	(7.60%)	(2.30%)	(7.30%)
Valuation allowance	(10.00%)	20.80%	5.80%
U.S. permanent differences	3.60%	(3.40%)	6.00%
U.S. R&D credit	(1.30%)	8.40%	(2.30%)
Uncertain tax positions	(0.90%)	7.60%	(14.30%)
Goodwill impairment	0.00%	(41.20%)	0.00%
Tax law changes	(1.10%)	15.50%	24.50%
Other, net	0.10%	(0.20%)	(0.80%)
Effective tax rate (as a percent)	4.50%	27.10%	32.50%

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to impairment loss.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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