Goodwill and Other Intangible assets, Net Future Amortization Expense (Details) $ in Millions	Oct. 31, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 3
Finite-Lived Intangible Assets, Amortization Expense, Year Two	2
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1
Finite-Lived Intangible Assets, Amortization Expense, Year Four	1
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 4