Financial Instruments - Contractual Maturities of Investments in Available-for-Sale Debt Securities (Details) $ in Millions	Jul. 31, 2017 USD ($)
Amortized Cost
Due in more than five years	$ 248
Fair Value
Due in more than five years	$ 278

Amortized Cost of available-for-sale debt securities, maturing after the fifth fiscal year following the latest fiscal year.

No definition available.

Name:	hpe_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveYearsAmortizedCost
Namespace Prefix:	hpe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant