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Commitments and Contingencies - Additional Information (Details)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2021
aircraft
Jul. 31, 2021
aircraft
Dec. 31, 2017
aircraft
Dec. 31, 2021
USD ($)
aircraft
employee_group
Dec. 31, 2020
USD ($)
Long-term Purchase Commitment [Line Items]          
Purchase commitments for aircraft and engines, 2022 | $       $ 784  
Purchase commitments for aircraft and engines, 2023 | $       1,215  
Purchase commitments for aircraft and engines, 2024 | $       1,450  
Purchase commitments for aircraft and engines, 2025 | $       1,754  
Purchase commitments for aircraft and engines, 2026 | $       2,345  
Purchase commitments for aircraft and engines, thereafter | $       $ 6,218  
Number of union-represented employee groups | employee_group       7  
Amount of employees represented by unions       88.00%  
Accrued liabilities for health care claims | $       $ 5 $ 4
Air Transportation Equipment          
Long-term Purchase Commitment [Line Items]          
Number of aircraft agreed to purchase | aircraft       234  
Air Transportation Equipment | A320neo          
Long-term Purchase Commitment [Line Items]          
Number of aircraft agreed to purchase | aircraft     67 76  
Number of aircraft eligible for conversion | aircraft       18  
Air Transportation Equipment | A321neo          
Long-term Purchase Commitment [Line Items]          
Number of aircraft agreed to purchase | aircraft 91 10 67 158  
Number of leasing partners with signed letter of intent | aircraft   2      
Number of aircraft signed in to direct lease agreements | aircraft       7  
Number of aircraft covered under non-binding letter of intent | aircraft       3