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Stock-Based Compensation - Stock-Based Compensation Expense and Related Income Tax Benefits for Continuing Operations (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax stock-based compensation expense due to adjustments	$ 268	$ 224	$ 182
2011 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from option exercises and purchases	158	118	48
Benefit realized for tax deduction from option exercises	$ 23	$ 15	9
Spinoff | Hewlett Packard Enterprise
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax stock-based compensation expense due to adjustments			$ 2

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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