Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships Included in Earnings (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2026	Apr. 30, 2025	Apr. 30, 2026	Apr. 30, 2025
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	$ (94)	$ 148	$ (101)	$ 191
Cash flow hedges:
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	(94)	148	(101)	191
Cash flow hedges: \| Products net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	(87)	167	(89)	234
Cash flow hedges: \| Cost of products net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	(13)	(23)	(24)	(50)
Cash flow hedges: \| Operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	2	1	4	1
Cash flow hedges: \| Interest and other, net
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain reclassified from Accumulated other comprehensive (loss) income into earnings	$ 4	$ 3	$ 8	$ 6

HP INC 10-Q