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Commitments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
aircraft
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]      
Impairment of Long-Lived Assets Held-for-use $ 0 $ 319 $ 0
Purchase Obligation, Due in Next Twelve Months 1,100    
Purchase Obligation, Due in Second Year 1,500    
Purchase Obligation, Due in Third Year 1,300    
Purchase Obligation, Due in Fourth Year 1,700    
Purchase Obligation, Due in Fifth Year 1,600    
Other Commitment, Due in Fifth Year $ 600    
Unrecorded Unconditional Purchase Obligation, Aircraft Purchase Deliver Change 414    
Commitments (Textual) [Abstract]      
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements $ 34    
Ratification Bonus   $ 50  
Percentage Of Employees Represented By Unions Under Collective Bargaining Agreements 47.00%    
Employment agreement 5 years    
Employment Agreement Automatic Renewal Term 5 years    
Renewal notice period 90 days    
A220-300 [Member]      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Number of aircraft and spare engine orders by the firm | aircraft 70    
A-321 Neo [Member]      
Unrecorded Unconditional Purchase Obligation [Line Items]      
Number of aircraft and spare engine orders by the firm | aircraft 79    
Number Of Aircraft Scheduled To Receive Next Year | aircraft 14    
Number of Aircraft Expected to be Delivered within Twelve Months | aircraft 11