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Customer Financing (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Customer Financing [Line Items]    
Financing receivables individually evaluated for impairment $ 596 $ 616
Impaired financing receivables 444 446
American Airlines [Member]
   
Customer Financing [Line Items]    
Financing receivables individually evaluated for impairment $ 504  
Internally Assigned Grade [Member] | CCC Credit Rating [Member]
   
Customer Financing [Line Items]    
Percentage of Credit Default Rates Applied to Customers 46.00%