Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018 USD ($) segments	Jul. 31, 2017 USD ($)	Jul. 31, 2018 USD ($) segments	Jul. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number Of Segments | segments	4		4
Intersegment sales and revenues	$ 0	$ 0	$ 0	$ 0
Sales and revenues, net	2,606	2,213	6,933	5,972
Financial Services Operations
Segment Reporting Information [Line Items]
Intersegment sales and revenues	25	27	69	70
Sales and revenues, net	65	62	187	172
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	22	10	61	27
Sales and revenues, net	1,916	1,531	4,871	3,956
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	2	6	6	19
Sales and revenues, net	605	586	1,774	1,766
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	(70)	(53)	(174)	(134)
Sales and revenues, net	$ (69)	$ (50)	$ (166)	$ (126)