Taxes on Earnings - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2018	Oct. 31, 2017
Income Tax Disclosure [Abstract]
Deferred tax assets - long-term	$ 5,933	$ 4,663
Deferred tax liabilities - long-term	(235)	(104)
Deferred tax assets net of deferred tax liabilities	$ 5,698	$ 4,559