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, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Segment Information
Net revenue	$ 14,603	$ 14,586	$ 43,349	$ 43,106
Total segment earnings from operations	1,079	1,018	2,933	2,837
Restructuring and other charges	(17)	(4)	(141)	(92)
Acquisition-related credits (charges)	9	(10)	(12)	(97)
Amortization of intangible assets	(29)	(20)	(87)	(60)
Interest and other, net	(831)	0	(902)	(831)
Earnings before taxes	248	1,018	2,031	2,006
Operating segments
Segment Information
Net revenue	14,603	14,584	43,354	43,105
Total segment earnings from operations	1,289	1,169	3,696	3,429
Other
Segment Information
Net revenue	0	2	(5)	1
Corporate and unallocated costs and other	(113)	(62)	(290)	(140)
Stock-based compensation expense	(60)	(55)	(233)	(203)
Restructuring and other charges	(17)	(4)	(141)	(92)
Acquisition-related credits (charges)	9	(10)	(12)	(97)
Amortization of intangible assets	(29)	(20)	(87)	(60)
Interest and other, net	(831)	0	(902)	(831)
Personal Systems | Operating segments
Segment Information
Net revenue	9,690	9,395	28,268	27,597
Total segment earnings from operations	547	362	1,342	1,026
Printing | Operating segments
Segment Information
Net revenue	4,912	5,188	15,084	15,505
Total segment earnings from operations	765	829	2,425	2,465
Corporate Investments | Operating segments
Segment Information
Net revenue	1	1	2	3
Total segment earnings from operations	$ (23)	$ (22)	$ (71)	$ (62)