Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020 USD ($) segments	Apr. 30, 2019 USD ($)	Apr. 30, 2020 USD ($) segments	Apr. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number Of Segments | segments	4		4
Intersegment sales and revenues	$ 0	$ 0	$ 0	$ 0
Sales and revenues, net	1,925	2,996	3,763	5,429
Financial Services Operations
Segment Reporting Information [Line Items]
Intersegment sales and revenues	14	30	25	57
Sales and revenues, net	50	48	96	95
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	4	9	8	30
Sales and revenues, net	1,385	2,287	2,623	4,063
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	1	1	2	3
Sales and revenues, net	442	578	934	1,124
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	(23)	(47)	(46)	(109)
Sales and revenues, net	$ 1	$ 3	$ 2	$ 6