Segment Reporting - Summary of Segment Long Lived Assets and Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 2,197	$ 2,693	$ 3,962	$ 5,114
Financial Services Operations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Investment Income, Interest	42	44	84	89
Sales and revenues, net	$ 58	$ 60	$ 117	$ 120