Fair Value Measurements - Financial Instruments Measured on Nonrecurring Basis (Details) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017
Impaired finance receivables with specific loss reserves [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 20	$ 16
Impaired finance receivables with specific loss reserves [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	20	16
Specific loss reserves on impaired finance receivables [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific loss reserve	(9)	(7)
Specific loss reserves on impaired finance receivables [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Specific loss reserve	(9)	(7)
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Finance Receivables Fair Value Disclosure	$ 11	$ 9