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Leases - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
engine
aircraft
transaction
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Lessee, Lease, Description [Line Items]      
Operating aircraft leases, minimum remaining lease term 2 months    
Operating aircraft leases, maximum remaining lease term 4 years    
Finance leases, number of spare engines | engine 12    
Operating leases, number of spare engines | engine 26    
Number of transactions | transaction 2    
Gain on sale leaseback transactions | $ $ 17,000,000 $ 0 $ 0
Facility leases, minimum lease term remaining 1 month    
Facility leases, maximum lease term remaining 14 years    
Embraer E190 Fleet      
Lessee, Lease, Description [Line Items]      
Impairment losses | $ $ 0 $ 0 $ 52,000,000
Aircraft      
Lessee, Lease, Description [Line Items]      
Number of aircraft operated 290    
Number of aircraft accounted for under operating leases 26    
Finance lease, number of aircraft leases 0    
Number of aircraft having purchase options 8