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Commitments - Narrative (Details) gallon in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2023 USD ($) | Apr. 30, 2022 USD ($) gallon | Dec. 31, 2021 | Sep. 30, 2023 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) term | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | May 01, 2022
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |  |  |  |  |
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements |  |  |  |  |  | $ 31 |  |  |
Number of renewal terms, option one | term |  |  |  |  |  | 1 |  |  |
Lease renewal term, one |  |  |  |  |  | 10 years |  |  |
Number of renewal terms, option two | term |  |  |  |  |  | 2 |  |  |
Lease renewal term, two |  |  |  |  |  | 5 years |  |  |
2024 |  |  |  |  |  | $ 5 |  |  |
2025 |  |  |  |  |  | 5 |  |  |
2026 |  |  |  |  |  | 5 |  |  |
Over the remainder of the term |  |  |  |  |  | $ 71 |  |  |
Commitment, sustainable aviation fuel, gallon | gallon |  | 125 |  |  |  |  |  |  |
Commitment terms |  | 10 years |  |  |  |  |  |  |
Ratification bonus |  |  |  |  | $ 8 |  |  |  |
Percentage of employees represented by unions under collective bargaining agreements |  |  |  |  |  | 51.00% |  |  |
Percentage of employees represented by unions under collective bargaining agreements, will become amendable within one year |  |  |  |  |  | 22.00% |  |  |
Employment agreement term of TWU |  |  | 5 years |  |  |  |  |  |
One-time bonus payment | $ 95 |  |  |  |  |  |  |  |
Contract extension period | 2 years |  |  |  |  |  |  |  |
Union contract costs |  |  |  | $ 8 |  | $ 105 | $ 33 | $ 8 |
Employment agreement |  |  |  |  |  | 5 years |  |  |
Employment agreement automatic renewal term |  |  |  |  |  | 5 years |  |  |
Renewal notice period |  |  |  |  |  | 90 days |  |  |
Airbus A220 |  |  |  |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |  |  |  |  |
One-time bonus payment |  | $ 32 |  |  |  |  |  |  |
Base pay increase |  |  |  |  |  |  |  |  | 3.00%

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