Fair Value Measurements - Fair Value of Assets Measurement Date, Valuation Techniques and Related Unobservable Inputs of Those Assets (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Property Subject to or Available for Operating Lease [Line Items]
Fair Value	$ 368		$ 252
Equipment Under Operating Leases Assets Held For Sale Or Re Lease [Member]
Property Subject to or Available for Operating Lease [Line Items]
Fair Value	25
Aircraft Value Publications [Member]
Property Subject to or Available for Operating Lease [Line Items]
Quantitative Inputs Used	35
Aircraft Value Publications [Member] | Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Quantitative Inputs Used	24	[1]
Aircraft Value Publications [Member] | Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Quantitative Inputs Used	53	[1]
Aircraft Condition Adjustments [Member]
Property Subject to or Available for Operating Lease [Line Items]
Quantitative Inputs Used	(10)
Aircraft Condition Adjustments [Member] | Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Quantitative Inputs Used	(10)	[2]
Aircraft Condition Adjustments [Member] | Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Quantitative Inputs Used	$ 0	[2]

[1] The range represents the sum of the highest and lowest values for all aircraft subject to fair value measurement, according to the third party aircraft valuation publications that we use in our valuation process.

[2] The negative amount represents the sum for all aircraft subject to fair value measurement, of all downward adjustments based on consideration of individual aircraft attributes and condition. The positive amount represents the sum of all such upward adjustments.