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Revenue Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,408 $ 1,712    
Passenger Revenue - Loyalty Air Travel 103 90    
Other Revenue - Loyalty 51 43    
Other Revenue - Non Loyalty 26 26    
Revenue from Contract with Customer, Excluding Assessed Tax 1,588 1,871    
Air Traffic Liability - Passenger Travel 1,020   $ 929  
Air Traffic Liability - Loyalty Program (Air Transportation) 656   661  
Other Deferred Revenue 33   10  
Contract with Customer, Liability 1,709   1,600  
Contract with Customer, Liability, Revenue Recognized 636 668    
Air Traffic Liability 656 594 $ 661 $ 580
Increase (Decrease) to Air Traffic Liability - Points Redeemed (103) (90)    
Increase (Decrease) to Air Traffic Liability - Points Earned $ 98 $ 104    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-03-31        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 3 years