Segment Reporting - Summary of Segment Operations (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Segment Reporting Information [Line Items]
External sales and revenues, net	$ 2,996		$ 2,422	$ 5,429	$ 4,327
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(48)		55	(37)
Income Tax Expense (Benefit)	1	$ 1	(7)	20	(22)
Interest expense	82	$ 82	79	167	158
Equity in income of non-consolidated affiliates	3		0	3	0
Capital expenditures	22		23	66	53
Intersegment sales and revenues	0		0	0	0
Segment Reporting, Segment Revenue	2,996		2,422	5,429	4,327
Segment Profit Loss	(49)		62	(57)	4
Depreciation, Depletion and Amortization	49		54	97	109
North America Truck [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net	2,287		1,688		2,916
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(74)		42	16
Income Tax Expense (Benefit)	0		0	0	0
Interest expense	0		0		0
Equity in income of non-consolidated affiliates	2		1	3	1
Capital expenditures	21		30		55
Intersegment sales and revenues	9		16	30
Segment Reporting, Segment Revenue	2,296		1,704		2,955
Segment Profit Loss	(74)		42	16	35
Depreciation, Depletion and Amortization	26		34	52	69
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net	3		4	6
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(153)		(139)	(413)	(355)
Income Tax Expense (Benefit)	(1)		7	(20)
Interest expense	55		58		116
Equity in income of non-consolidated affiliates	1		0		0
Capital expenditures	1		(8)	10	(4)
Intersegment sales and revenues	(47)		(47)	(109)
Segment Reporting, Segment Revenue	(44)		(43)	(103)	(97)
Segment Profit Loss	(154)		(132)	(433)
Depreciation, Depletion and Amortization	3		3	6	5
North America Parts [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net	578		601	1,124	1,165
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	144		132	288	269
Income Tax Expense (Benefit)	0		0	0	0
Interest expense	0		0	0	0
Equity in income of non-consolidated affiliates	0		0
Capital expenditures	(1)		1	1	1
Intersegment sales and revenues	1		0	3	4
Segment Reporting, Segment Revenue	579		601	1,127	1,169
Segment Profit Loss	144		132	288	269
Depreciation, Depletion and Amortization	2		1		3
Global Operations [Member]
Segment Reporting Information [Line Items]
External sales and revenues, net	80		89	141	161
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	3		1	9	(6)
Income Tax Expense (Benefit)	0		0	0
Interest expense	0		0	0	0
Equity in income of non-consolidated affiliates	0		(1)	(1)
Capital expenditures	0		0	1	1
Intersegment sales and revenues	7		8	19	17
Segment Reporting, Segment Revenue	87		97	160	178
Segment Profit Loss	3		1	9	(6)
Depreciation, Depletion and Amortization	2		2	4	5
Financial Services Operations
Segment Reporting Information [Line Items]
Interest Revenue (Expense), Net	55		44	108	85
External sales and revenues, net	48		40	95	78
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	32		19	63	39
Income Tax Expense (Benefit)	0		0	0	0
Interest expense	27		21	56	42
Equity in income of non-consolidated affiliates	0		0	0
Capital expenditures	1		0		0
Intersegment sales and revenues	30		23	57	44
Segment Reporting, Segment Revenue	78		63	152	122
Segment Profit Loss	32		19	63	39
Depreciation, Depletion and Amortization	$ 16		$ 14	$ 32	$ 27