Taxes on Earnings - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jan. 31, 2019	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Deferred tax assets - long-term	$ 2,210	$ 2,403
Deferred tax liabilities - long-term	(300)	(228)
Deferred tax assets net of deferred tax liabilities	$ 1,910	$ 2,175