Allowance for Doubtful Accounts - Impaired Finance Receivables (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jul. 31, 2014 Retail Portfolio [Member]	Jul. 31, 2013 Retail Portfolio [Member]	Jul. 31, 2014 Impaired finance receivables with specific loss reserves [Member]	Oct. 31, 2013 Impaired finance receivables with specific loss reserves [Member]	Jul. 31, 2014 Impaired finance receivables with specific loss reserves [Member] Retail Portfolio [Member]	Oct. 31, 2013 Impaired finance receivables with specific loss reserves [Member] Retail Portfolio [Member]	Jul. 31, 2014 Impaired finance receivables with specific loss reserves [Member] Wholesale Portfolio [Member]	Oct. 31, 2013 Impaired finance receivables with specific loss reserves [Member] Wholesale Portfolio [Member]	Jul. 31, 2014 Impaired financing receivable without specific loss reserves [Member]	Oct. 31, 2013 Impaired financing receivable without specific loss reserves [Member]	Jul. 31, 2014 Impaired financing receivable without specific loss reserves [Member] Retail Portfolio [Member]	Oct. 31, 2013 Impaired financing receivable without specific loss reserves [Member] Retail Portfolio [Member]	Jul. 31, 2014 Impaired financing receivable without specific loss reserves [Member] Wholesale Portfolio [Member]	Oct. 31, 2013 Impaired financing receivable without specific loss reserves [Member] Wholesale Portfolio [Member]	Jul. 31, 2014 Specific loss reserves on impaired finance receivables [Member]	Oct. 31, 2013 Specific loss reserves on impaired finance receivables [Member]	Jul. 31, 2014 Specific loss reserves on impaired finance receivables [Member] Retail Portfolio [Member]	Oct. 31, 2013 Specific loss reserves on impaired finance receivables [Member] Retail Portfolio [Member]	Jul. 31, 2014 Specific loss reserves on impaired finance receivables [Member] Wholesale Portfolio [Member]	Oct. 31, 2013 Specific loss reserves on impaired finance receivables [Member] Wholesale Portfolio [Member]	Jul. 31, 2014 Finance receivable non-accrual status [Member]	Oct. 31, 2013 Finance receivable non-accrual status [Member]	Jul. 31, 2014 Finance receivable non-accrual status [Member] Retail Portfolio [Member]	Oct. 31, 2013 Finance receivable non-accrual status [Member] Retail Portfolio [Member]	Jul. 31, 2014 Finance receivable non-accrual status [Member] Wholesale Portfolio [Member]	Oct. 31, 2013 Finance receivable non-accrual status [Member] Wholesale Portfolio [Member]
Finance Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment			$ 18	$ 15	$ 18	$ 15	$ 0	$ 0	$ 2	$ 1	$ 2	$ 1	$ 0	$ 0
Specific loss reserves on impaired finance receivables															7	6	7	6	0	0
Finance receivables on non-accrual status																					19	10	19	10	0	0
Impaired Financing Receivable, Average Recorded Investment	$ 15	$ 12