Finance Receivables - Narrative (Details) $ in Millions	Apr. 30, 2017 USD ($) segments	Oct. 31, 2016 USD ($)
Schedule of Securitization [Line Items]
Loans and Leases Receivable, Net Amount	$ 1,700	$ 1,700
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	$ 854	800
Cash Collateral for Borrowed Securities	126	108
Financial Services Operations
Schedule of Securitization [Line Items]
Assets Net Of Intercompany Balances	$ 2,100	$ 2,100