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Commitments and Contingencies - Additional Information (Details)
$ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2021
aircraft
Jul. 31, 2021
aircraft
leasingPartner
Dec. 31, 2017
aircraft
Mar. 31, 2022
USD ($)
aircraft
employee_group
aircraftEngine
Dec. 31, 2021
USD ($)
aircraft
Long-term Purchase Commitment [Line Items]          
Purchase commitments for aircraft and engines, remainder of 2022       $ 681  
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       1,755  
Purchase commitments for aircraft and engines, 2026       2,346  
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       $ 4 $ 5
Aircraft Engine          
Long-term Purchase Commitment [Line Items]          
Number of aircraft agreed to purchase | aircraftEngine       21  
Air Transportation Equipment          
Long-term Purchase Commitment [Line Items]          
Number of aircraft agreed to purchase | aircraft       232  
Air Transportation Equipment | A320neo          
Long-term Purchase Commitment [Line Items]          
Number of aircraft agreed to purchase | aircraft     67 74  
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 | leasingPartner   2      
Number of aircraft signed in to direct lease agreements | aircraft       7  
Number of aircraft covered under non-binding letter of intent | aircraft       3