Segment Reporting - Summary of Segment Long Lived Assets and Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 1,675	$ 3,042	$ 5,438	$ 8,471
Financial Services Operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 39	$ 46	$ 135	$ 141