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Leases - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
term
aircraft
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]      
Aircraft leases, minimum remaining lease term 19 months    
Aircraft leases, maximum remaining lease term 7 years    
Fleet impairment | $ $ 0 $ 273 $ 0
Facility leases, minimum lease term remaining 1 month    
Facility leases, maximum lease term remaining 14 years    
2024 | $ $ 3    
2025 | $ 6    
2026 | $ 7    
Thereafter | $ $ 97    
Number of renewal terms, option one | term 1    
Lease renewal term, one 10 years    
Number of renewal terms, option two | term 2    
Lease renewal term, two 5 years    
Minimum      
Lessee, Lease, Description [Line Items]      
Renewal lease term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Renewal lease term 2 years    
Aircraft      
Lessee, Lease, Description [Line Items]      
Number of aircraft operated | aircraft 282    
Number of aircraft accounted for under operating leases | aircraft 62    
Finance lease, number of aircraft leases | aircraft 0    
Number of aircraft variable rate rent | aircraft 0    
Number of aircraft having purchase options | aircraft 30