Segment Reporting - Summary of Segment Long Lived Assets and Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 2,606	$ 2,213	$ 6,933	$ 5,972
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 65	$ 62	$ 187	$ 172