Taxes on Earnings - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jul. 31, 2019	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Deferred tax assets	$ 1,657	$ 2,403
Deferred tax liabilities	(278)	(228)
Deferred tax assets net of deferred tax liabilities	$ 1,379	$ 2,175