Concentrations - Portfolio Carrying Values by Product (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Types Of Aircraft [Line Items]
Carrying Value	$ 4,066	$ 4,315
717 [Member]
Types Of Aircraft [Line Items]
Carrying Value	1,869	2,001
757 [Member]
Types Of Aircraft [Line Items]
Carrying Value	519	631
737 [Member]
Types Of Aircraft [Line Items]
Carrying Value	328	408
MD-11 [Member]
Types Of Aircraft [Line Items]
Carrying Value	278	311
787 [Member]
Types Of Aircraft [Line Items]
Carrying Value	265
767 [Member]
Types Of Aircraft [Line Items]
Carrying Value	231	316
747 [Member]
Types Of Aircraft [Line Items]
Carrying Value	168	225
MD-80 [Member]
Types Of Aircraft [Line Items]
Carrying Value	163	171
777 [Member]
Types Of Aircraft [Line Items]
Carrying Value	136	134
Other [Member]
Types Of Aircraft [Line Items]
Carrying Value	$ 109	$ 118