Segment Reporting - Summary of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
External sales and revenues, net									$ 11,251	$ 10,250	$ 8,570
Sales and revenues, net	$ 2,780	$ 3,042	$ 2,996	$ 2,433	$ 3,317	$ 2,606	$ 2,422	$ 1,905	11,251	10,250	8,570
Income from continuing operations, net of tax									221	340	29
Income tax expense									(19)	(52)	(10)
Interest expense									312	327	351
Equity in income of non-consolidated affiliates									4	0	6
Capital expenditures									134	113	102
Intersegment sales and revenues									0	0	0
Segment Profit Loss									240	392	39
Depreciation, Depletion and Amortization									193	211	223
North America Truck [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net									8,501	7,386	5,770
Sales and revenues, net									8,585	7,490	5,809
Income from continuing operations, net of tax									269	397	(6)
Income tax expense									0	0	0
Interest expense									0	0	0
Equity in income of non-consolidated affiliates									2	2	4
Capital expenditures									101	99	82
Intersegment sales and revenues									84	104	39
Segment Profit Loss									269	397	(6)
Depreciation, Depletion and Amortization									104	130	137
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net									9	0	10
Sales and revenues, net									(219)	(264)	(175)
Income from continuing operations, net of tax									(769)	(716)	(651)
Income tax expense									(19)	(52)	(10)
Interest expense									207	235	265
Equity in income of non-consolidated affiliates									0	0	0
Capital expenditures									22	8	12
Intersegment sales and revenues									(228)	(264)	(185)
Segment Profit Loss									(750)	(664)	(641)
Depreciation, Depletion and Amortization									9	10	11
North America Parts [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net									2,239	2,399	2,369
Sales and revenues, net									2,245	2,407	2,392
Income from continuing operations, net of tax									598	569	616
Income tax expense									0	0	0
Interest expense									0	0	0
Equity in income of non-consolidated affiliates									3	3	3
Capital expenditures									7	2	2
Intersegment sales and revenues									6	8	23
Segment Profit Loss									598	569	616
Depreciation, Depletion and Amortization									5	6	11
Global Operations [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net									309	305	279
Sales and revenues, net									343	360	309
Income from continuing operations, net of tax									0	2	(7)
Income tax expense									0	0	0
Interest expense									0	0	0
Equity in income of non-consolidated affiliates									(1)	(5)	(1)
Capital expenditures									2	3	5
Intersegment sales and revenues									34	55	30
Segment Profit Loss									0	2	(7)
Depreciation, Depletion and Amortization									11	10	13
Financial Services Operations
Segment Reporting Information [Line Items]
External sales and revenues, net									193	160	142
Sales and revenues, net									297	257	235
Income from continuing operations, net of tax									123	88	77
Income tax expense									0	0	0
Interest expense									105	92	86
Equity in income of non-consolidated affiliates									0	0	0
Capital expenditures									2	1	1
Investment Income, Interest									208	182	165
Intersegment sales and revenues									104	97	93
Segment Profit Loss									123	88	77
Depreciation, Depletion and Amortization									64	55	51
Truck
Segment Reporting Information [Line Items]
Sales and revenues, net									8,496	7,323	5,706
Parts
Segment Reporting Information [Line Items]
Sales and revenues, net									2,021	2,215	2,177
Engine
Segment Reporting Information [Line Items]
Sales and revenues, net									541	552	545
Financial Services Operations
Segment Reporting Information [Line Items]
Sales and revenues, net									$ 193	$ 160	$ 142