Allowance for Doubtful Accounts - Schedule of Allowance Aging Analysis (Details) $ in Millions	Oct. 31, 2017 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	$ 1,768
30-90 days past due	22
Total finance receivables	1,805
Retail Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	524
30-90 days past due	21
Total finance receivables	559
Wholesale Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Finance Receivables, Current	1,244
30-90 days past due	1
Total finance receivables	1,246
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Over 90 days past due	15
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Over 90 days past due	14
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Wholesale Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Over 90 days past due	$ 1