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NON-CURRENT ASSETS AND DISPOSAL GROUP CLASSIFIED AS HELD FOR SALE - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) aircraft engine | Dec. 31, 2022 USD ($) aircraft engine | Dec. 31, 2021 engine aircraft | Dec. 31, 2020 aircraft
Non-Current Assets And Disposal Group Classified Held For Sale [Line Items] |  |  |  |
Number of aircraft sold | 1 | 3 | 5 |
Boeing 767 |  |  |  |
Non-Current Assets And Disposal Group Classified Held For Sale [Line Items] |  |  |  |
Adjustments related to aircraft transactions | $ | $ 3 |  |  |
Airbus A319 |  |  |  |
Non-Current Assets And Disposal Group Classified Held For Sale [Line Items] |  |  |  |
Adjustments related to aircraft transactions | $ | 39 | $ 345 |  |
Airbus 320 |  |  |  |
Non-Current Assets And Disposal Group Classified Held For Sale [Line Items] |  |  |  |
Adjustments related to aircraft transactions | $ | $ 9 | $ 25 |  |
Non-current assets or disposal groups classified as held for sale | Boeing 767 |  |  |  |
Non-Current Assets And Disposal Group Classified Held For Sale [Line Items] |  |  |  |
Number of aircraft transferred to held for sale | 1 |  |  | 11
Non-current assets or disposal groups classified as held for sale | Airbus 350 |  |  |  |
Non-Current Assets And Disposal Group Classified Held For Sale [Line Items] |  |  |  |
Number of engines transferred | engine |  |  | 3 |
Number of engines sold | engine | 1 | 1 | 1 |
Non-current assets or disposal groups classified as held for sale | Airbus A319 |  |  |  |
Non-Current Assets And Disposal Group Classified Held For Sale [Line Items] |  |  |  |
Number of aircraft transferred to held for sale |  | 28 |  |
Non-current assets or disposal groups classified as held for sale | Airbus 320 |  |  |  |
Non-Current Assets And Disposal Group Classified Held For Sale [Line Items] |  |  |  |
Number of aircraft transferred to held for sale | 6 | 6 |  |
Number of aircraft sold | 2 |  |  |
Number of engines transferred | engine | 8 | 8 |  |

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