Taxes on Earnings - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2017	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Deferred tax assets - long-term	$ 3,920	$ 3,830
Deferred tax liabilities - long-term	(92)	(98)
Deferred tax assets net of deferred tax liabilities	$ 3,828	$ 3,732