Goodwill and Other Intangible assets, Net - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					3 Months Ended
	Oct. 31, 2014		Oct. 31, 2013	Oct. 31, 2012		Oct. 31, 2013		Apr. 30, 2013	Apr. 30, 2014	Oct. 31, 2011
Goodwill [Line Items]
Goodwill	$ 38		$ 184	$ 280		$ 184				$ 319
Indefinite-Lived Intangible Assets (Excluding Goodwill)	34		46			46
Goodwill, Impairment Loss	142		81
Amortization of Intangible Assets	18		22	25
North America Truck [Member]
Goodwill [Line Items]
Goodwill	0		0	82		0				82
Goodwill, Impairment Loss	0		81			(77)		(4)
Brazilian Reporting Unit [Member]
Goodwill [Line Items]
Goodwill									142
Indefinite-Lived Intangible Assets (Excluding Goodwill)									43
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	7			0		0			7
Goodwill, Impairment Loss	$ 142	[1]		$ 0	[1]	$ 81	[1]

[1] (A)For more information, see Note 8, Goodwill and Other Intangible Assets, Net, and includes $4 million related to discontinued operations in 2013.