Segment Reporting - Summary of Segment Long Lived Assets and Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 3,042	$ 2,606	$ 8,471	$ 6,933
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 46		$ 141