Segment Reporting - Summary of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Segment Reporting Information [Line Items]
External sales and revenues, net									$ 7,503	$ 11,251	$ 10,250
Sales and revenues, net	$ 2,065	$ 1,675	$ 1,925	$ 1,838	$ 2,780	$ 3,042	$ 2,996	$ 2,433	7,503	11,251	10,250
Income from continuing operations, net of tax									(347)	221	340
Income tax expense									59	(19)	(52)
Interest expense									268	312	327
Equity in income of non-consolidated affiliates									2	4	0
Capital expenditures									148	134	113
Intersegment sales and revenues									0	0	0
Segment Profit Loss									(406)	240	392
Depreciation, Depletion and Amortization									199	193	211
North America Truck [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net									5,240	8,501	7,386
Sales and revenues, net									5,312	8,585	7,490
Income from continuing operations, net of tax									(141)	269	397
Income tax expense									0	0	0
Interest expense									0	0	0
Equity in income of non-consolidated affiliates									1	2	2
Capital expenditures									124	101	99
Intersegment sales and revenues									72	84	104
Segment Profit Loss									(141)	269	397
Depreciation, Depletion and Amortization									116	104	130
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net									3	9	0
Sales and revenues, net									(125)	(219)	(264)
Income from continuing operations, net of tax									(719)	(769)	(716)
Income tax expense									59	(19)	(52)
Interest expense									199	207	235
Equity in income of non-consolidated affiliates									0	0	0
Capital expenditures									13	22	8
Intersegment sales and revenues									(128)	(228)	(264)
Segment Profit Loss									(778)	(750)	(664)
Depreciation, Depletion and Amortization									6	9	10
North America Parts [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net									1,841	2,239	2,399
Sales and revenues, net									1,846	2,245	2,407
Income from continuing operations, net of tax									448	598	569
Income tax expense									0	0	0
Interest expense									0	0	0
Equity in income of non-consolidated affiliates									1	3	3
Capital expenditures									8	7	2
Intersegment sales and revenues									5	6	8
Segment Profit Loss									448	598	569
Depreciation, Depletion and Amortization									6	5	6
Global Operations [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net									242	309	305
Sales and revenues, net									253	343	360
Income from continuing operations, net of tax									0	0	2
Income tax expense									0	0	0
Interest expense									0	0	0
Equity in income of non-consolidated affiliates									0	(1)	(5)
Capital expenditures									3	2	3
Intersegment sales and revenues									11	34	55
Segment Profit Loss									0	0	2
Depreciation, Depletion and Amortization									6	11	10
Financial Services Operations
Segment Reporting Information [Line Items]
External sales and revenues, net									177	193	160
Sales and revenues, net									217	297	257
Income from continuing operations, net of tax									65	123	88
Income tax expense									0	0	0
Interest expense									69	105	92
Equity in income of non-consolidated affiliates									0	0	0
Capital expenditures									0	2	1
Investment Income, Interest									130	208	182
Intersegment sales and revenues									40	104	97
Segment Profit Loss									65	123	88
Depreciation, Depletion and Amortization									65	64	55
Truck
Segment Reporting Information [Line Items]
Sales and revenues, net									5,249	8,496	7,323
Parts
Segment Reporting Information [Line Items]
Sales and revenues, net									1,698	2,021	2,215
Engine
Segment Reporting Information [Line Items]
Sales and revenues, net									388	541	552
Financial Services Operations
Segment Reporting Information [Line Items]
Sales and revenues, net									$ 168	$ 193	$ 160