Segment Information - Schedule of Net Revenue by Segment and Business Unit (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 7,764	$ 7,501	$ 22,906	$ 21,211
Hybrid IT
Segment Reporting Information [Line Items]
Net revenue	6,058	5,898	18,086	16,782
Intelligent Edge
Segment Reporting Information [Line Items]
Net revenue	784	707	2,100	1,864
Financial Services
Segment Reporting Information [Line Items]
Net revenue	922	896	2,721	2,565
Corporate Investments
Segment Reporting Information [Line Items]
Net revenue	0	0	(1)	0
Operating Segment
Segment Reporting Information [Line Items]
Net revenue	7,956	7,688	23,443	21,951
Operating Segment | Hybrid IT
Segment Reporting Information [Line Items]
Net revenue	6,243	6,080	18,597	17,472
Operating Segment | Hybrid IT | Total Hybrid IT Product
Segment Reporting Information [Line Items]
Net revenue	4,456	4,280	13,129	12,048
Operating Segment | Hybrid IT | Compute
Segment Reporting Information [Line Items]
Net revenue	3,510	3,340	10,215	9,516
Operating Segment | Hybrid IT | Storage
Segment Reporting Information [Line Items]
Net revenue	887	877	2,747	2,375
Operating Segment | Hybrid IT | DC Networking
Segment Reporting Information [Line Items]
Net revenue	59	63	167	157
Operating Segment | Hybrid IT | Pointnext
Segment Reporting Information [Line Items]
Net revenue	1,787	1,800	5,468	5,424
Operating Segment | Intelligent Edge
Segment Reporting Information [Line Items]
Net revenue	785	711	2,115	1,887
Operating Segment | Intelligent Edge | HPE Aruba Product
Segment Reporting Information [Line Items]
Net revenue	706	642	1,890	1,683
Operating Segment | Intelligent Edge | HPE Aruba Services
Segment Reporting Information [Line Items]
Net revenue	79	69	225	204
Operating Segment | Financial Services
Segment Reporting Information [Line Items]
Net revenue	928	897	2,732	2,592
Operating Segment | Corporate Investments
Segment Reporting Information [Line Items]
Net revenue	0	0	(1)	0
Elimination of intersegment net revenue and other
Segment Reporting Information [Line Items]
Net revenue	192	187	537	740
Elimination of intersegment net revenue and other | Hybrid IT
Segment Reporting Information [Line Items]
Net revenue	185	182	511	690
Elimination of intersegment net revenue and other | Intelligent Edge
Segment Reporting Information [Line Items]
Net revenue	1	4	15	23
Elimination of intersegment net revenue and other | Financial Services
Segment Reporting Information [Line Items]
Net revenue	6	1	11	27
Elimination of intersegment net revenue and other | Corporate Investments
Segment Reporting Information [Line Items]
Net revenue	$ 0	$ 0	$ 0	$ 0