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Commitments and Contingencies - Narrative (Details)
$ / shares in Units, employee in Thousands, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
employee
commitment
aircraft
Aircraft
Jun. 30, 2019
USD ($)
employee
commitment
aircraft
Jun. 30, 2019
USD ($)
employee
commitment
aircraft
Dec. 31, 2019
flight
Mar. 13, 2019
aircraft
Mar. 12, 2019
flight
Dec. 31, 2018
USD ($)
Nov. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2018
aircraft
Commitments and Contingencies [Line Items]                  
Term of capacity purchase agreement 10 years                
Remaining term of debt     11 years            
Aggregate balance $ 12,500 $ 12,500 $ 12,500            
United Airlines, Inc.                  
Commitments and Contingencies [Line Items]                  
Number of employees | employee 95 95 95            
Percentage of employees represented by various U.S. labor organizations     84.00%            
Kingsland                  
Commitments and Contingencies [Line Items]                  
Number of shares that may be put to United (in shares) | shares               144.8  
Number of ADRs that may be put into United (in shares) | shares               18.1  
Market price of common stock at fifth anniversary (in dollars per share) | $ / shares               $ 12  
Aggregate maximum possible combined put payment and guarantee amount               $ 217  
Liability for the fair value of guarantees             $ 31    
Tax-Exempt Special Facilities Revenue Bonds                  
Commitments and Contingencies [Line Items]                  
Aggregate principal amount of guarantee $ 1,900 $ 1,900 $ 1,900            
Floating Rate Debt                  
Commitments and Contingencies [Line Items]                  
Debt 3,400 3,400 3,400            
Fixed Rate Debt                  
Commitments and Contingencies [Line Items]                  
Debt 9 9 $ 9            
Loans and Leases from Non-U.S. Entities                  
Commitments and Contingencies [Line Items]                  
Remaining term of debt     11 years            
Aggregate balance 3,200 3,200 $ 3,200            
Aircraft Mortgage Debt                  
Commitments and Contingencies [Line Items]                  
Aggregate principal amount of guarantee $ 139 $ 139 $ 139            
Airbus A319                  
Commitments and Contingencies [Line Items]                  
Number of aircraft committed to purchase | aircraft 20 20 20            
Boeing 737-700                  
Commitments and Contingencies [Line Items]                  
Number of aircraft committed to purchase | aircraft 19 19 19            
Boeing 737 MAX                  
Commitments and Contingencies [Line Items]                  
Number of aircraft committed to purchase | commitment 171 171 171            
Number of aircraft grounded under emergency order | aircraft         14        
Number of flights operated using grounded aircraft | flight           50      
Boeing 737 MAX | Forecast                  
Commitments and Contingencies [Line Items]                  
Number of expected flights operating per day prior to grounding order | flight       110          
Embraer E175                  
Commitments and Contingencies [Line Items]                  
Number of aircraft committed to purchase | commitment 38 38 38            
Number of aircraft ordered | aircraft   20              
Embraer ERJ 145                  
Commitments and Contingencies [Line Items]                  
Number of leased aircraft | aircraft                 54
Number of aircraft purchased | aircraft                 17
Embraer CRJ-550                  
Commitments and Contingencies [Line Items]                  
Number of aircraft operated under CPA | Aircraft 54