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Commitments (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) aircraft airbus | Dec. 31, 2021 USD ($) aircraft airbus | Feb. 18, 2022 USD ($) airbus
Other Commitments [Abstract] |  |  |
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements | $ 26 | $ 26 |
Ratification bonus | $ 8 |  |
Percentage of employees represented by unions under collective bargaining agreements | 46.00% | 46.00% |
Percentage of employees represented by unions under collective bargaining agreements, amendable or will become amendable within one year | 20.00% | 20.00% |
Employment agreement |  | 5 years |
Employment agreement automatic renewal term |  | 5 years |
Renewal notice period |  | 90 days |
Subsequent Event |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Number of optional aircraft converted to firm orders | airbus |  |  | 30
2022 |  |  | $ 1,000
2023 |  |  | 1,700
2024 |  |  | 2,000
2025 |  |  | 1,600
2026 |  |  | 1,300
Thereafter |  |  | $ 1,000
A-321 Neo |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Number of aircraft and spare engine orders by the firm | airbus | 64 | 64 |
Number of aircraft scheduled to receive next year | aircraft | 3 | 3 |
A220-300 |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |
Number of aircraft and spare engine orders by the firm | airbus | 62 | 62 |
Number of aircraft scheduled to receive next year | aircraft | 10 | 10 |

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