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Contingencies - US Airways Antitrust Litigation (Details) - Jun. 30, 2015 - USD ($)
Total
Total
Maximum [Member] | U S Airways Inc [Member]    
Loss Contingencies [Line Items]    
Amount of damages claimed value $ 20  
Amount paid in litigation settlement $ 20  
Insurance Carriers [Member]    
Loss Contingencies [Line Items]    
Interest on insurance claims   18.00%
Foreign Tax Authority [Member] | Indian Income Tax Litigation [Member]    
Loss Contingencies [Line Items]    
Taxes, interest and penalties   $ 34,000,000