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Contingencies - Antitrust Litigation and DOJ Investigation (Details)
$ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
lawsuit
Insurance Carriers [Member]  
Loss Contingencies [Line Items]  
Interest on insurance claims 18.00%
Indian Income Tax Litigation [Member] | Foreign Tax Authority [Member]  
Loss Contingencies [Line Items]  
Taxes, interest and penalties | $ $ 42
U S Airways Inc [Member] | Minimum [Member]  
Loss Contingencies [Line Items]  
Estimate of possible loss | $ 45
U S Airways Inc [Member] | Maximum [Member]  
Loss Contingencies [Line Items]  
Estimate of possible loss | $ $ 73
Hotel Occupancy Tax Litigation [Member]  
Loss Contingencies [Line Items]  
Number of lawsuits | lawsuit 80
Hotel Occupancy Tax Litigation [Member] | Dismissed Litigation [Member]  
Loss Contingencies [Line Items]  
Number of lawsuits | lawsuit 30
Consumer Class Action Lawsuits [Member]  
Loss Contingencies [Line Items]  
Number of lawsuits | lawsuit 2