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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2024
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Rollforward of the Amounts Included in AOCI, Net of Taxes | A rollforward of the amounts included in AOCI, net of taxes, is shown below for 2024 and 2023:
(in millions) | Fuel derivatives |  |  |  | Defined benefit plan items |  | Other |  | Deferred tax impact |  | Accumulated other comprehensive income (loss)
Balance at December 31, 2022 | $ | 305 |  |  |  |  | $ | 170 |  |  | $ | (32) |  |  | $ | (99) |  |  | $ | 344 |
Changes in fair value | (312) |  |  |  |  | (11) |  |  | 10 |  |  | 73 |  |  | (240) |
Reclassification to earnings | (128) |  |  |  |  | (10) |  |  | 7 |  |  | 27 |  |  | (104) |
Balance at December 31, 2023 | $ | (135) |  |  |  |  | $ | 149 |  |  | $ | (15) |  |  | $ | 1 |  |  | $ | — |
Changes in fair value | (130) |  |  |  |  | 25 |  |  | — |  |  | 25 |  |  | (80) |
Reclassification to earnings | 72 |  |  |  |  | (7) |  |  | 8 |  |  | (18) |  |  | 55 |
Balance at December 31, 2024 | $ | (193) |  |  |  |  | $ | 167 |  |  | $ | (7) |  |  | $ | 8 |  |  | $ | (25) |
Schedule of Reclassification out of Accumulated Other Comprehensive Income (Loss) | The following table illustrates the significant amounts reclassified out of each component of AOCI for the year ended December 31, 2024:
Year ended December 31, 2024
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the Consolidated Statement of Income
AOCI components |  |
Unrealized loss on fuel derivative instruments |  | $ | 72 |  |  | Fuel and oil expense
|  | 17 |  |  | Less: Tax expense
|  | $ | 55 |  |  | Net of tax
Unrealized (gain) on defined benefit plan |  | $ | (7) |  |  | Other (gains) losses, net
|  | (2) |  |  | Less: Tax expense
|  | $ | (5) |  |  | Net of tax
Other |  | 8 |  |  | Other operating expenses
|  | 3 |  |  | Less: Tax expense
|  | $ | 5 |  |  | Net of tax
Total reclassifications for the period |  | $ | 55 |  |  | Net of tax

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