Portfolio Quality - Allowance for Losses (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	$ 2,346	$ 2,348
BBB [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	1,201	1,316
BB [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	63	67
B [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	51	103
CCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	778	512
D [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	253	350
Out-of-Production Aircraft [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	1,589	1,784
Out-of-Production Aircraft [Member] | BBB [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	1,201	1,316
Out-of-Production Aircraft [Member] | B [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	51	103
Out-of-Production Aircraft [Member] | CCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	174	194
Out-of-Production Aircraft [Member] | D [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	163	171
In-Production /Other Aircraft [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	757	564
In-Production /Other Aircraft [Member] | BB [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	63	67
In-Production /Other Aircraft [Member] | CCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	604	318
In-Production /Other Aircraft [Member] | D [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of loan and lease receivables	$ 90	$ 179