Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019 USD ($) segments	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) segments	Jul. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number Of Segments | segments	4		4
Intersegment sales and revenues	$ 0	$ 0	$ 0	$ 0
Sales and revenues, net	3,042	2,606	8,471	6,933
Financial Services Operations
Segment Reporting Information [Line Items]
Intersegment sales and revenues	28	25	85	69
Sales and revenues, net	46		141
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	45	22	75	61
Sales and revenues, net	2,342		6,405
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	2	2	5	6
Sales and revenues, net	569		1,693
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	(83)	$ (70)	(192)	$ (174)
Sales and revenues, net	$ 3		$ 9