v3.26.1
Operating Leases - Aircraft (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
aircraft
lease
Jun. 30, 2025
USD ($)
aircraft
Jun. 30, 2026
USD ($)
lease
aircraft
engine
Jun. 30, 2025
USD ($)
engine
aircraft
Lessee, Lease, Description [Line Items]        
Gains recognized on sale-leaseback transactions | $     $ 94 $ 90
Aircraft        
Lessee, Lease, Description [Line Items]        
Number of aircraft leased | lease 165   165  
Aircraft | A320neo | Aircraft Sale Leaseback        
Lessee, Lease, Description [Line Items]        
Third party lessors, number of aircraft | aircraft 6 3 13 7
Aircraft | Minimum        
Lessee, Lease, Description [Line Items]        
Remaining lease terms (in months and years) 1 year   1 year  
Aircraft | Maximum        
Lessee, Lease, Description [Line Items]        
Remaining lease terms (in months and years) 12 years   12 years  
Engines        
Lessee, Lease, Description [Line Items]        
Number of leases, early return agreement | lease 61   61  
Number of engines dependent on usage-based metrics | engine     17  
Engines | Aircraft Sale Leaseback        
Lessee, Lease, Description [Line Items]        
Leaseback transactions, number of engines | engine       2
Engines | Minimum        
Lessee, Lease, Description [Line Items]        
Remaining lease terms (in months and years) 1 month   1 month  
Engines | Maximum        
Lessee, Lease, Description [Line Items]        
Remaining lease terms (in months and years) 12 years   12 years  
Aircraft and Aircraft Engines        
Lessee, Lease, Description [Line Items]        
Gains recognized on sale-leaseback transactions | $ $ 47 $ 34 $ 94 $ 90