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Leases and Capacity Purchase Agreements - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
aircraft
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]        
Additional leases that have not yet commenced | $   $ 740    
Lease terms of additional leases that have not yet commenced (up to)   12 years    
Number of aircraft included in flight equipment   11    
Number of aircraft qualified for sale recorded as operating lease right-of-use assets and current/long-term obligations   4    
Boeing 787-9 and Boeing 737 MAX        
Lessee, Lease, Description [Line Items]        
Number of aircraft delivered under sale and leaseback transaction   15    
United Airlines, Inc. | Cash Collateralized Letters of Credit        
Lessee, Lease, Description [Line Items]        
Number of regional aircraft   475    
Mainline Aircraft        
Lessee, Lease, Description [Line Items]        
Number of aircraft subject to operating leases   104    
Number of aircraft subject to finance leases   37    
Regional Aircraft        
Lessee, Lease, Description [Line Items]        
Number of aircraft subject to operating leases   290    
Number of aircraft subject to finance leases   45    
Regional Aircraft | United Airlines, Inc. | Capacity Purchase Agreements        
Lessee, Lease, Description [Line Items]        
Expenses | $   $ 600 $ 1,000 $ 1,000
Accounts payable | $   $ 68 $ 69  
Minimum | Mainline Aircraft        
Lessee, Lease, Description [Line Items]        
Initial term of operating leases   1 month    
Minimum | Non-Aircraft        
Lessee, Lease, Description [Line Items]        
Initial term of operating leases   1 month    
Maximum | Mainline Aircraft        
Lessee, Lease, Description [Line Items]        
Initial term of operating leases   12 years    
Maximum | Non-Aircraft        
Lessee, Lease, Description [Line Items]        
Initial term of operating leases   32 years    
Forecast | Capacity Purchase Agreements        
Lessee, Lease, Description [Line Items]        
Scheduled block hours increase (decrease) percentage 10.00%      
Change in cash obligation | $ $ 85