Fair Value Measurements - Assets Measured at Fair Value on Non-Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member] Equipment Under Operating Leases [Member]	Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member] Equipment Under Operating Leases [Member]		Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member] Assets Held-for-sale or re-lease [Member]	Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs (Level 3) [Member] Assets Held-for-sale or re-lease [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$ 368	$ 252	$ 4	$ 5	$ 25	$ 111	$ 12	$ 96	[1]	$ 13	$ 15	[1]
Total Losses					$ (14)	$ (53)	$ (2)	$ (49)		$ (12)	$ (4)

[1] For an asset that incurred impairments in both Equipment under operating leases and Assets held for sale or re-lease, the losses are reflected in the asset's classification as of the time of the respective impairments while the fair value of the asset as of the date of the latest impairment is reflected only in the asset's then current classification. As of September 30, 2011, such asset with a fair value of $7 changed classification from Equipment under operating leases to Assets held for sale or re-lease.