Segment Information - Schedule of Net Revenue by Segment and Business Unit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Segment Reporting Information [Line Items]
Net revenue	$ 7,468	$ 6,808	$ 15,142	$ 13,710
Hybrid IT
Segment Reporting Information [Line Items]
Net revenue	5,851	5,348	12,027	10,884
Intelligent Edge
Segment Reporting Information [Line Items]
Net revenue	703	595	1,316	1,157
Financial Services
Segment Reporting Information [Line Items]
Net revenue	914	865	1,800	1,669
Corporate Investments
Segment Reporting Information [Line Items]
Net revenue	0	0	(1)	0
Operating Segment
Segment Reporting Information [Line Items]
Net revenue	7,649	7,115	15,487	14,263
Operating Segment | Total Hybrid IT | Total Hybrid IT Product
Segment Reporting Information [Line Items]
Net revenue	4,171	3,812	8,673	7,768
Operating Segment | Total Hybrid IT | Compute
Segment Reporting Information [Line Items]
Net revenue	3,213	3,033	6,705	6,176
Operating Segment | Total Hybrid IT | Storage
Segment Reporting Information [Line Items]
Net revenue	912	734	1,860	1,498
Operating Segment | Total Hybrid IT | DC Networking
Segment Reporting Information [Line Items]
Net revenue	46	45	108	94
Operating Segment | Total Hybrid IT | Pointnext
Segment Reporting Information [Line Items]
Net revenue	1,852	1,825	3,681	3,624
Operating Segment | Hybrid IT
Segment Reporting Information [Line Items]
Net revenue	6,023	5,637	12,354	11,392
Operating Segment | Total Intelligent Edge | HPE Aruba Product
Segment Reporting Information [Line Items]
Net revenue	635	538	1,184	1,041
Operating Segment | Total Intelligent Edge | HPE Aruba Services
Segment Reporting Information [Line Items]
Net revenue	75	68	146	135
Operating Segment | Intelligent Edge
Segment Reporting Information [Line Items]
Net revenue	710	606	1,330	1,176
Operating Segment | Financial Services
Segment Reporting Information [Line Items]
Net revenue	916	872	1,804	1,695
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	181	307	345	553
Elimination of intersegment net revenue and other | Hybrid IT
Segment Reporting Information [Line Items]
Net revenue	172	289	327	508
Elimination of intersegment net revenue and other | Intelligent Edge
Segment Reporting Information [Line Items]
Net revenue	7	11	14	19
Elimination of intersegment net revenue and other | Financial Services
Segment Reporting Information [Line Items]
Net revenue	2	7	4	26
Elimination of intersegment net revenue and other | Corporate Investments
Segment Reporting Information [Line Items]
Net revenue	$ 0	$ 0	$ 0	$ 0