Taxes on Earnings - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2019	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Deferred tax assets	$ 2,199	$ 2,403
Deferred tax liabilities	(275)	(228)
Deferred tax assets net of deferred tax liabilities	$ 1,924	$ 2,175