Summary of Significant Accounting Policies - Inventory (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Inventory [Line Items]
Gross truck bed inventory	$ 206	$ 410
Inventory reserves	110	208
Inventory Valuation Reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	208	110	$ 43
Additions charged to expense	111	187	117
Deductions/Other additions	(209)	(89)	(50)
Balance at end of period	$ 110	$ 208	$ 110