Supplementary Financial Information - Supplier Finance Program (Narrative) (Details) - USD ($) $ in Millions	Oct. 31, 2025	Oct. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Payment terms offered by HP	30 days
Obligations outstanding	$ 8,913	$ 7,808
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration]	Accounts payable
Current obligations outstsanding	$ 100	$ 100
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable

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Amount of obligation for supplier finance program.

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Amount of obligation for supplier finance program, classified as current.

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Period when payment is expected to be made to finance provider or intermediary in supplier finance program, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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