Segment Reporting - Segment Assets (Details) (USD $) In Millions, unless otherwise specified	Apr. 30, 2013		Oct. 31, 2012
Segment Reporting Information [Line Items]
Segment Assets	$ 8,723		$ 9,102
Truck [Member]
Segment Reporting Information [Line Items]
Segment Assets	2,139	[1]	2,118	[1]
Engine [Member]
Segment Reporting Information [Line Items]
Segment Assets	1,738		1,777
Parts [Member]
Segment Reporting Information [Line Items]
Segment Assets	709		707
Financial Services Operations [Member]
Segment Reporting Information [Line Items]
Segment Assets	2,518		2,563
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Segment Assets	$ 1,619		$ 1,937

[1] Includes amounts related to discontinued operations. For more information, see Note 2, Discontinued Operations and Other Divestitures.