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Operating Leases - Aircraft Rent Expense and Maintenance Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Lessee, Lease, Description [Line Items]      
Aircraft rent expense $ 748 $ 675 $ 554
Supplemental rent expense related to probable lease return condition obligations 20 52 20
Leased aircraft return cost liability 19 49  
Proceeds from previously paid maintenance deposits   104  
Aircraft and spare engines      
Lessee, Lease, Description [Line Items]      
Gain lease extension $ 27 $ 14 $ 53