Segment Reporting - Summary of Segment Long Lived Assets and Revenue (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales and revenues, net	$ 2,693	$ 2,746	$ 5,114	$ 4,954
Financial Services Operations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Investment Income, Interest	44	42	89	82
Sales and revenues, net	$ 60	$ 57	$ 120	$ 112