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FLEET TRANSITION (Details) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2023 USD ($) airline | Mar. 31, 2023 USD ($) airline | Mar. 31, 2022 USD ($)
Impaired Long-Lived Assets [Line Items] |  |  |
Asset Impairment Charges |  | $ 13 | $ 75
Impairment Charges |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |
Asset Impairment Charges |  | 0 | 70
Accelerated aircraft ownership expenses [Member] |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |
Asset Impairment Charges |  | 6 | 0
Lease return costs and other expenses |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |
Asset Impairment Charges |  | $ 7 | $ 5
A321neo [Member] |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |
Number of Aircraft Operated | airline |  | 10 |
A321neo [Member] | Subsequent Event [Member] |  |  |
Impaired Long-Lived Assets [Line Items] |  |  |
Number of Aircraft Operated | airline | 4 |  |
Remainder of 2023 | $ 250 |  |

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- Details
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