Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018 USD ($) segments	Apr. 30, 2017 USD ($)	Apr. 30, 2018 USD ($) segments	Apr. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number Of Segments | segments	4		4
Intersegment sales and revenues	$ 0	$ 0	$ 0	$ 0
Sales and revenues, net	2,422	2,096	4,327	3,759
Financial Services Operations
Segment Reporting Information [Line Items]
Intersegment sales and revenues	23	23	44	43
Sales and revenues, net	63	56	122	110
North America Truck [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	16	7	39	17
Sales and revenues, net	1,704	1,398	2,955	2,425
North America Parts [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	0	6	4	13
Sales and revenues, net	601	610	1,169	1,180
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Intersegment sales and revenues	(47)	(40)	(104)	(81)
Sales and revenues, net	$ (43)	$ (38)	$ (97)	$ (76)