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Commitments and Contingencies - Additional Information (Details)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
employeeGroup
Dec. 31, 2024
USD ($)
Jun. 30, 2025
USD ($)
aircraft
engine
employeeGroup
Long-term Purchase Commitment [Line Items]      
Costs capitalized $ 100 $ 95 $ 100
Accounts receivable, net $ 98 73 $ 98
Number of union-represented employee groups | employeeGroup 7   7
Amount of employees represented by unions     87.00%
Accrued liabilities for health care claims $ 7 6 $ 7
Domestic Tax Jurisdiction | Internal Revenue Service (IRS)      
Long-term Purchase Commitment [Line Items]      
Preliminary assessment of estimated tax liability $ 133 $ 149  
Engines      
Long-term Purchase Commitment [Line Items]      
Number of aircraft agreed to purchase | engine     9
Aircraft      
Long-term Purchase Commitment [Line Items]      
Number of aircraft agreed to purchase | aircraft     180
Aircraft | A320neo      
Long-term Purchase Commitment [Line Items]      
Number of aircraft agreed to purchase | aircraft     27
Aircraft | A321neo      
Long-term Purchase Commitment [Line Items]      
Number of aircraft agreed to purchase | aircraft     153