Overview and Basis of Presentation - Effects of New Accounting Standards (Details) - USD ($) $ in Millions	Jul. 31, 2019	Nov. 01, 2018	Oct. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable	$ 2,965		$ 3,263
Inventory	2,216		2,447
Other current assets	2,624		3,280
Long-term financing receivables and other assets	9,092		11,359
Total assets	50,760		55,493
Taxes on earnings	160		378
Deferred revenue	3,225		3,177
Other accrued liabilities	4,686		3,840
Other non-current liabilities	5,569		6,885
Accumulated deficit	(7,959)		(5,899)
Total HPE stockholders' equity	17,533		21,239
Total liabilities and stockholders' equity	$ 50,760		55,493
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable		$ 3,301
Inventory		2,433
Other current assets		3,330
Long-term financing receivables and other assets		11,403
Total assets		20,467
Taxes on earnings		388
Deferred revenue		3,141
Other accrued liabilities		3,892
Other non-current liabilities		6,855
Subtotal liabilities		14,276
Accumulated deficit		(5,777)
Total HPE stockholders' equity		(5,777)
Total liabilities and stockholders' equity		8,499
Accounting Standards Update 2014-09 | Historical Accounting Method
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable			3,263
Inventory			2,447
Other current assets			3,280
Long-term financing receivables and other assets			11,359
Total assets			20,349
Taxes on earnings			378
Deferred revenue			3,177
Other accrued liabilities			3,840
Other non-current liabilities			6,885
Subtotal liabilities			14,280
Accumulated deficit			(5,899)
Total HPE stockholders' equity			(5,899)
Total liabilities and stockholders' equity			$ 8,381
Accounting Standards Update 2014-09 | Effect of Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable		38
Inventory		(14)
Other current assets		50
Long-term financing receivables and other assets		44
Total assets		118
Taxes on earnings		10
Deferred revenue		(36)
Other accrued liabilities		52
Other non-current liabilities		(30)
Subtotal liabilities		(4)
Accumulated deficit		122
Total HPE stockholders' equity		122
Total liabilities and stockholders' equity		$ 118