Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019 USD ($) segments	Apr. 30, 2018 USD ($)	Apr. 30, 2019 USD ($) segments	Apr. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number Of Segments | segments	4		4
Intersegment sales and revenues	$ 0	$ 0	$ 0	$ 0
Sales and revenues, net	2,996	2,422	5,429	4,327
Financial Services Operations
Segment Reporting Information [Line Items]
Intersegment sales and revenues	30	23	57	44
Sales and revenues, net	48		95
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	9	16	30
Sales and revenues, net	2,287		4,063
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	1	0	3	$ 4
Sales and revenues, net	578		1,124
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	(47)	$ (47)	(109)
Sales and revenues, net	$ 3		$ 6