Segment Reporting - Summary of Segment Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2015	Oct. 31, 2014
Segment Reporting Information [Line Items]
Segment Assets	$ 6,769	$ 7,443
North America Truck [Member]
Segment Reporting Information [Line Items]
Segment Assets	1,967	2,245
North America Parts [Member]
Segment Reporting Information [Line Items]
Segment Assets	640	672
Global Operations [Member]
Segment Reporting Information [Line Items]
Segment Assets	458	657
Financial Services Operations [Member]
Segment Reporting Information [Line Items]
Segment Assets	2,655	2,582
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Segment Assets	1,049	$ 1,287
Deferred tax assets reclassified from Financial Services	$ 16