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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) aircraft | Dec. 31, 2023 USD ($) aircraft | Apr. 30, 2023 gate | Dec. 31, 2022 USD ($) | Mar. 31, 2022 gate
Other Commitments [Line Items] |  |  |  |  |  |
Assets | $ 36,487 | $ 36,487 | $ 36,487 |  | $ 35,369 |
Payment Guarantee |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Principal amount of guarantee | 59 | 59 | 59 |  |  |
Net present value of future principal and interest payments | 65 | 65 | 65 |  | $ 77 |
Los Angeles World Airports |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
New airport gates | gate |  |  |  | 9 |  |
Payments for airport projects | 62 |  |  |  |  |
Projected airport improvement costs | 2,300 | 2,300 | 2,300 |  |  |
William P. Hobby Airport |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
New airport gates | gate |  |  |  |  |  | 7
Projected airport improvement costs | 470 | 470 | 470 |  |  |
Assets | 0 | 0 | 0 |  |  |
Aircraft |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Committed expenditures, year one | 2,200 | 2,200 | 2,200 |  |  |
Committed expenditures, year two | 1,700 | 1,700 | 1,700 |  |  |
Committed expenditures, year three | 1,900 | 1,900 | 1,900 |  |  |
Committed expenditures, year four | 2,600 | 2,600 | 2,600 |  |  |
Committed expenditures, year five | 2,900 | 2,900 | 2,900 |  |  |
Committed expenditures, year six and beyond | $ 5,300 | $ 5,300 | $ 5,300 |  |  |
737 MAX 8 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft orders | aircraft |  |  | 86 |  |  |
Number of aircraft orders accelerated | aircraft |  | 1 |  |  |  |
Number of aircraft orders converted and shifted | aircraft |  | 3 |  |  |  |
Number of aircraft orders shifted | aircraft |  | 3 |  |  |  |
737 MAX 7 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft orders | aircraft |  |  | 39 |  |  |
Number of aircraft orders exercised | aircraft |  | 8 |  |  |  |
Number of aircraft orders converted and shifted | aircraft |  | 3 |  |  |  |

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