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Contingencies - Antitrust Litigation and DOJ Investigation (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
lawsuit
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
lawsuit
Dec. 31, 2016
USD ($)
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     $ 45  
US Airways Litigation [Member]        
Loss Contingencies [Line Items]        
Damages awarded       $ 15
Reasonable attorneys' fees, expenses and costs       17
Loss contingency accrual   $ 32   32
US Airways Litigation [Member] | Minimum [Member]        
Loss Contingencies [Line Items]        
Estimate of possible loss   32   32
US Airways Litigation [Member] | Maximum [Member]        
Loss Contingencies [Line Items]        
Estimate of possible loss   65   $ 65
US Airways Litigation [Member] | US Airways [Member]        
Loss Contingencies [Line Items]        
Damages awarded $ 15 $ 5    
Attorneys' fees and costs sought $ 125      
Hotel Occupancy Tax Litigation [Member]        
Loss Contingencies [Line Items]        
Number of lawsuits | lawsuit 80   80  
Consumer Class Action Lawsuits [Member]        
Loss Contingencies [Line Items]        
Number of lawsuits | lawsuit 2   2