Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020 USD ($) segments	Jul. 31, 2019 USD ($)	Jul. 31, 2020 USD ($) segments	Jul. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number Of Segments | segments	4		4
Intersegment sales and revenues	$ 0	$ 0	$ 0	$ 0
Sales and revenues, net	1,675	3,042	5,438	8,471
Financial Services Operations
Segment Reporting Information [Line Items]
Intersegment sales and revenues	10	28	35	85
Sales and revenues, net	39	46	135	141
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	26	45	34	75
Sales and revenues, net	1,177	2,342	3,800	6,405
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	1	2	3	5
Sales and revenues, net	413	569	1,347	1,693
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	(38)	(83)	(84)	(192)
Sales and revenues, net	$ 0	$ 3	$ 2	$ 9