Finance Receivables - Narrative (Details) $ in Millions	Jul. 31, 2016 USD ($) segments	Oct. 31, 2015 USD ($)
Schedule of Securitization [Line Items]
Loans and Leases Receivable, Net Amount	$ 1,600	$ 2,000
Number of Portfolio Segments for Finance Receivables | segments	2
Trac Funding Facility [Member]
Schedule of Securitization [Line Items]
Finance Receivables Retail Accounts Collateral For Borrowed Securities	$ 917	1,000
Cash Collateral for Borrowed Securities	54	96
Financial Services Operations [Member]
Schedule of Securitization [Line Items]
Assets Net Of Intercompany Balances	$ 2,100	$ 2,500