Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended
	Jan. 31, 2019 USD ($) segments	Jan. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number Of Segments | segments	4
Intersegment sales and revenues	$ 0	$ 0
Sales and revenues, net	2,433	1,905
Financial Services Operations
Segment Reporting Information [Line Items]
Intersegment sales and revenues	27	21
Sales and revenues, net	47
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	21	23
Sales and revenues, net	1,776
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	2	4
Sales and revenues, net	546
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	(62)	$ (57)
Sales and revenues, net	$ 3