Equipment on Operating Leases for Truck and Other Segment and for Financial Services Segment (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property Subject to or Available for Operating Lease [Line Items]
Total	$ 3,328.4	$ 2,888.7	$ 2,389.8
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	1,357.8	1,183.7
Less allowance for depreciation	(319.5)	(325.8)
Total	1,038.3	857.9
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	3,212.2	2,778.2
Less allowance for depreciation	(922.1)	(747.4)
Total	$ 2,290.1	$ 2,030.8