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Operating Leases - Aircraft (Details)
$ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
engine
aircraft
Dec. 31, 2024
USD ($)
aircraft
engine
Dec. 31, 2023
USD ($)
engine
aircraft
Lessee, Lease, Description [Line Items]      
Gains recognized on sale-leaseback transactions | $ $ 302 $ 294 $ 147
Aircraft and spare engines      
Lessee, Lease, Description [Line Items]      
Number of leases | aircraft 176    
Aircraft and spare engines | Minimum      
Lessee, Lease, Description [Line Items]      
Remaining lease terms (in months and years) 2 years    
Aircraft and spare engines | Maximum      
Lessee, Lease, Description [Line Items]      
Remaining lease terms (in months and years) 12 years    
Aircraft and spare engines | A320neo      
Lessee, Lease, Description [Line Items]      
Third party lessors, number of aircraft | aircraft 0 0 10
Aircraft and spare engines | A320neo | Aircraft Sale Leaseback      
Lessee, Lease, Description [Line Items]      
Third party lessors, number of aircraft | aircraft 19 23 11
Aircraft Engine      
Lessee, Lease, Description [Line Items]      
Number of leases | engine 61    
Number of engines dependent on usage-based metrics | engine 17    
Aircraft Engine | Aircraft Sale Leaseback      
Lessee, Lease, Description [Line Items]      
Leaseback transactions, number of engines | engine 18 5 4
Aircraft Engine | Minimum      
Lessee, Lease, Description [Line Items]      
Remaining lease terms (in months and years) 1 month    
Aircraft Engine | Maximum      
Lessee, Lease, Description [Line Items]      
Remaining lease terms (in months and years) 12 years    
Aircraft and Aircraft Engines      
Lessee, Lease, Description [Line Items]      
Gains recognized on sale-leaseback transactions | $ $ 302 $ 294 $ 147