Finance Receivables - Narrative (Details) $ in Millions	Jul. 31, 2015 USD ($) segments	Oct. 31, 2014 USD ($)
Schedule of Securitization [Line Items]
Loans and Leases Receivable, Net Amount	$ 2,000	$ 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	$ 1,000	996
Cash Collateral for Borrowed Securities	129	93
Financial Services Operations [Member]
Schedule of Securitization [Line Items]
Assets Net Of Intercompany Balances	$ 2,700	$ 2,600