Summary of Significant Accounting Policies - Inventory (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Inventory [Line Items]
Gross truck bed inventory	$ 135	$ 200
Inventory reserves	37
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	37	31	$ 110
Additions charged to expense	99	69	50
Deductions/Other additions	99	63	129
Balance at end of period	$ 37	$ 37	$ 31