Customer Financing (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Customer Financing [Line Items]
Financing receivables individually evaluated for impairment	$ 563	$ 616
Impaired financing receivables	420	446
American Airlines [Member]
Customer Financing [Line Items]
Financing receivables individually evaluated for impairment	$ 463
Internally Assigned Grade [Member] | CCC Credit Rating [Member]
Customer Financing [Line Items]
Percentage of Credit Default Rates Applied to Customers	46.00%