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FLEET TRANSITION (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) airline | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Impaired Long-Lived Assets [Line Items] |  |  |  |
Special items - Impairment charges and other | $ 156 | $ 155 | $ 355 | $ 376
Finance Lease, Liability | 452 |  | 452 |
Fleet transition - impairment [Member] |  |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |  |
Special items - Impairment charges and other | 120 | 0 | 271 | 70
Other fleet transition costs [Member] |  |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |  |
Special items - Impairment charges and other | $ 36 | $ 155 | $ 84 | $ 306
A321neo [Member] |  |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |  |
Number of Aircraft Operated | airline | 10 |  |  |
Finance Lease, Impairment Loss | $ 123 |  |  |
A321neo [Member] | Aircraft purchase [Member] |  |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |  |
Number of Aircraft Operated | airline | 3 |  |  |
A321neo [Member] | Aircraft purchase agreement [Member] |  |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |  |
Number of Aircraft Operated | airline | 7 |  |  |

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