Segment Information (Details 4) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information
Net revenue	$ 7,946	$ 7,764	$ 7,468	$ 7,674	$ 7,660	$ 7,501	$ 6,808	$ 6,902	$ 30,852	$ 28,871	$ 30,280
Operating segments
Segment Reporting Information
Net revenue									31,632	29,816	31,560
Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue									780	945	1,280
Hybrid IT
Segment Reporting Information
Net revenue									24,285	22,740	23,954
Hybrid IT | Operating segments
Segment Reporting Information
Net revenue									25,033	23,627	25,102
Hybrid IT | Operating segments | Hybrid IT Product [Member]
Segment Reporting Information
Net revenue									17,754	16,331	17,790
Hybrid IT | Operating segments | Compute
Segment Reporting Information
Net revenue									13,823	12,837	13,994
Hybrid IT | Operating segments | Storage
Segment Reporting Information
Net revenue									3,706	3,280	3,389
Hybrid IT | Operating segments | DC Networking
Segment Reporting Information
Net revenue									225	214	407
Hybrid IT | Operating segments | HPE Pointnext
Segment Reporting Information
Net revenue									7,279	7,296	7,312
Hybrid IT | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue									748	887	1,148
Intelligent Edge
Segment Reporting Information
Net revenue									2,912	2,554	2,635
Intelligent Edge | Operating segments
Segment Reporting Information
Net revenue									2,929	2,584	2,674
Intelligent Edge | Operating segments | HPE Aruba Product
Segment Reporting Information
Net revenue									2,619	2,307	2,423
Intelligent Edge | Operating segments | HPE Aruba Services
Segment Reporting Information
Net revenue									310	277	251
Intelligent Edge | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue									17	30	39
Financial Services
Segment Reporting Information
Net revenue									3,656	3,574	3,097
Financial Services | Operating segments
Segment Reporting Information
Net revenue									3,671	3,602	3,190
Financial Services | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue									15	28	93
Corporate Investments
Segment Reporting Information
Net revenue									(1)	3	594
Corporate Investments | Operating segments
Segment Reporting Information
Net revenue									(1)	3	594
Corporate Investments | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue									$ 0	$ 0	$ 0