Segment Information - Schedule of Reconciliation of Segment Operating Results to HP Consolidated Results (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2023
Net revenue
Total net revenue	$ 55,295	$ 53,559	$ 53,718
Cost of net revenue
Total cost of net revenue	43,903	41,741	42,210
Operating expenses
Total segment operating expenses	8,218	8,000	8,052
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Operating Income (Loss)	3,174	3,818	3,456
Stock-based compensation expense	(522)	(452)	(438)
Restructuring and other charges	(405)	(301)	(527)
Acquisition and divestiture charges	(45)	(83)	(240)
Amortization of intangible assets	(345)	(318)	(350)
Interest and other, net	(506)	(539)	(519)
Earnings before taxes	2,668	3,279	2,937
Operating segments
Net revenue
Total net revenue	55,296	53,558	53,720
Cost of net revenue
Total cost of net revenue	43,806	41,666	42,124
Operating expenses
Total segment operating expenses	6,448	6,481	6,210
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Operating Income (Loss)	5,042	5,411	5,386
Corporate and unallocated costs and other
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Corporate and unallocated costs and other	(411)	(381)	(375)
Other
Net revenue
Total net revenue	(1)	1	(2)
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Stock-based compensation expense	(522)	(452)	(438)
Restructuring and other charges	(405)	(301)	(527)
Acquisition and divestiture charges	(45)	(83)	(240)
Amortization of intangible assets	(345)	(318)	(350)
Certain litigation charges	(140)	(58)	0
Interest and other, net	(506)	(539)	(519)
Personal Systems | Operating segments
Net revenue
Total net revenue	38,532	36,195	35,684
Cost of net revenue
Total cost of net revenue	32,877	30,385	30,267
Operating expenses
Total segment operating expenses	3,601	3,557	3,288
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Operating Income (Loss)	2,054	2,253	2,129
Printing | Operating segments
Net revenue
Total net revenue	16,702	17,338	18,029
Cost of net revenue
Total cost of net revenue	10,871	11,233	11,847
Operating expenses
Total segment operating expenses	2,713	2,815	2,783
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Operating Income (Loss)	3,118	3,290	3,399
Corporate Investments | Operating segments
Net revenue
Total net revenue	62	25	7
Cost of net revenue
Total cost of net revenue	58	48	10
Operating expenses
Total segment operating expenses	134	109	139
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Operating Income (Loss)	(130)	(132)	(142)
Commercial PS | Personal Systems | Operating segments
Net revenue
Total net revenue	27,438	25,486	24,712
Consumer PS | Personal Systems | Operating segments
Net revenue
Total net revenue	11,094	10,709	10,972
Supplies | Printing | Operating segments
Net revenue
Total net revenue	10,916	11,295	11,452
Commercial Printing | Printing | Operating segments
Net revenue
Total net revenue	4,633	4,841	5,250
Consumer Printing | Printing | Operating segments
Net revenue
Total net revenue	$ 1,153	$ 1,202	$ 1,327