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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2023 aircraft | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jan. 01, 2023
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Future aircraft purchase commitments |  |  | $ 17,800 |
Future Purchase Commitments |  |  |  |
Collective bargaining agreement term |  | 4 years |  |
Pilot pay rate increase |  |  |  | 18.00%
Pilot agreement expense |  | $ 735 |  |
Adjustments to other benefit-related items |  | $ 130 |  |
A330-900 |  |  |  |
Future Purchase Commitments |  |  |  |
Number of aircraft agreed to be acquired | aircraft | 1 |  |  |
A220-300 |  |  |  |
Future Purchase Commitments |  |  |  |
Number of aircraft purchase rights exercised | aircraft | 12 |  |  |

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