Segment Information - Schedule of Reconciliation of Segment Operating Results to HP Consolidated Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Net revenue:
Total net revenue	$ 13,932	$ 13,519	$ 40,656	$ 39,504
Earnings before taxes:
Total segment earnings from operations	716	940	2,215	2,827
Restructuring and other charges	(110)	(46)	(302)	(180)
Acquisition and divestiture charges	(8)	(22)	(31)	(71)
Amortization of intangible assets	(159)	(81)	(287)	(242)
Interest and other, net	(92)	(113)	(381)	(410)
Earnings before taxes	624	827	1,834	2,417
Operating Segments
Net revenue:
Total net revenue	13,933	13,519	40,658	39,504
Earnings before taxes:
Total segment earnings from operations	1,198	1,304	3,674	3,983
Other
Net revenue:
Total net revenue	(1)	0	(2)	0
Earnings before taxes:
Stock-based compensation expense	(100)	(96)	(432)	(367)
Restructuring and other charges	(110)	(46)	(302)	(180)
Acquisition and divestiture charges	(8)	(22)	(31)	(71)
Amortization of intangible assets	(159)	(81)	(287)	(242)
Certain litigation charges	(2)	(18)	(105)	(18)
Interest and other, net	(92)	(113)	(381)	(410)
Corporate and unallocated costs and other
Earnings before taxes:
Corporate and unallocated costs and other	(103)	(101)	(302)	(278)
Personal Systems | Operating Segments
Net revenue:
Total net revenue	9,931	9,369	28,179	26,604
Earnings before taxes:
Total segment earnings from operations	541	617	1,457	1,662
Printing | Operating Segments
Net revenue:
Total net revenue	3,986	4,143	12,436	12,886
Earnings before taxes:
Total segment earnings from operations	689	715	2,313	2,416
Corporate Investments | Operating Segments
Net revenue:
Total net revenue	16	7	43	14
Earnings before taxes:
Total segment earnings from operations	(32)	(28)	(96)	(95)
Commercial PS | Personal Systems | Operating Segments
Net revenue:
Total net revenue	7,036	6,677	20,467	18,964
Consumer PS | Personal Systems | Operating Segments
Net revenue:
Total net revenue	2,895	2,692	7,712	7,640
Supplies | Printing | Operating Segments
Net revenue:
Total net revenue	2,604	2,703	8,155	8,430
Commercial Printing | Printing | Operating Segments
Net revenue:
Total net revenue	1,113	1,147	3,424	3,579
Consumer Printing | Printing | Operating Segments
Net revenue:
Total net revenue	$ 269	$ 293	$ 857	$ 877