Overview and Summary of Significant Accounting Policies (Details 5) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017	Nov. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net of allowance for doubtful accounts	$ 2,957				$ 3,263				$ 2,957	$ 3,263		$ 3,301
Inventory	2,387				2,447				2,387	2,447		2,433
Other current assets	2,428				3,280				2,428	3,280		3,330
Long-term financing receivables and other assets												11,405
Total assets	51,803				55,493				51,803	55,493		20,469
Taxes on earnings	186				378				186	378		388
Deferred revenue	3,234				3,177				3,234	3,177		3,141
Other accrued liabilities	4,002				3,840				4,002	3,840		3,892
Other non-current liabilities												6,855
Subtotal liabilities												14,276
Accumulated deficit	(7,632)				(5,899)				(7,632)	(5,899)		(5,775)
Total HPE stockholders' equity	17,098				21,239				17,098	21,239		(5,775)
Total liabilities and stockholders' equity	51,803				55,493				51,803	55,493		8,501
Net revenue	7,215	$ 7,217	$ 7,150	$ 7,553	7,946	$ 7,764	$ 7,468	$ 7,674	29,135	30,852	$ 28,871
Historical Accounting Method
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net of allowance for doubtful accounts					3,263					3,263
Inventory					2,447					2,447
Other current assets					3,280					3,280
Long-term financing receivables and other assets					11,359					11,359
Total assets					20,349					20,349
Taxes on earnings					378					378
Deferred revenue					3,177					3,177
Other accrued liabilities					3,840					3,840
Other non-current liabilities					6,885					6,885
Subtotal liabilities					14,280					14,280
Accumulated deficit					(5,899)					(5,899)
Total HPE stockholders' equity					(5,899)					(5,899)
Total liabilities and stockholders' equity					$ 8,381					$ 8,381
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease assets	1,000								1,000
Lease liabilities	$ 1,100								1,100
Accounting Standards Update 2014-09 | Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net of allowance for doubtful accounts												38
Inventory												(14)
Other current assets												50
Long-term financing receivables and other assets												46
Total assets												120
Taxes on earnings												10
Deferred revenue												(36)
Other accrued liabilities												52
Other non-current liabilities												(30)
Subtotal liabilities												(4)
Accumulated deficit												124
Total HPE stockholders' equity												124
Total liabilities and stockholders' equity												$ 120
Net revenue									$ 49