Customer Financing (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Customer Financing [Line Items]
Customer financing receivables individually evaluated for impairment	$ 555	$ 616
Impaired customer financing receivables	418	446
Customer Financing Receivable individually evluated for impairment, allowance for credit losses	0	0
American Airlines [Member]
Customer Financing [Line Items]
Customer financing receivables individually evaluated for impairment	$ 454
C C C Credit Rating [Member]
Customer Financing [Line Items]
Percentage of Credit Default Rates Applied to Customers	46.00%