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SPECIAL ITEMS - Operating And Non-Operating (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Special items - operating | $ 345 | $ 443 | $ 580
Special items - net non-operating | 16 | (18) | 0
Fleet transition |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Special items - operating | 11 | 385 | 481
Labor agreements |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Special items - operating | 73 | 51 | 84
Integration costs |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Special items - operating | 208 | 7 | 0
Legal and professional fees |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Special items - operating | 115 | 7 |
Employee-related and other merger costs |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Special items - operating | 93 | 0 |
Litigation |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Special items - operating | $ 53 | $ 0 | $ 15

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