Finance Receivables - Narrative (Details) (USD $)	Apr. 30, 2015 segments	Jan. 31, 2015 segments	Oct. 31, 2014
Schedule of Securitization [Line Items]
Loans and Leases Receivable, Net Amount	$ 2,200,000,000		$ 2,000,000,000
Number of Portfolio Segments for Finance Receivables	2	2
Trac Funding Facility [Member]
Schedule of Securitization [Line Items]
Finance Receivables Retail Accounts Collateral For Borrowed Securities	1,100,000,000		996,000,000
Cash Collateral for Borrowed Securities	149,000,000		93,000,000
Financial Services Operations [Member]
Schedule of Securitization [Line Items]
Assets Net Of Intercompany Balances	$ 2,600,000,000		$ 2,600,000,000