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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 12 Months Ended
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Dec. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
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 2023 and 2022:
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  |  |  | Deferred tax impact |  | Accumulated other comprehensive income
Balance at December 31, 2021 | $ | 492 |  |  | $ | (57) |  |  | $ | 66 |  |  |  |  | $ | (113) |  |  | $ | 388 |
Changes in fair value | 645 |  |  | 18 |  |  | 106 |  |  |  |  | (179) |  |  | 590 |
Reclassification to earnings | (832) |  |  | 7 |  |  | (2) |  |  |  |  | 193 |  |  | (634) |
Balance at December 31, 2022 | $ | 305 |  |  | $ | (32) |  |  | $ | 170 |  |  |  |  | $ | (99) |  |  | $ | 344 |
Changes in fair value | (312) |  |  | 10 |  |  | (11) |  |  |  |  | 73 |  |  | (240) |
Reclassification to earnings | (128) |  |  | 7 |  |  | (10) |  |  |  |  | 27 |  |  | (104) |
Balance at December 31, 2023 | $ | (135) |  |  | $ | (15) |  |  | $ | 149 |  |  |  |  | $ | 1 |  |  | $ | — |
Reclassification out of Accumulated Other Comprehensive Income | The following table illustrates the significant amounts reclassified out of each component of AOCI for the year ended December 31, 2023:
Year ended December 31, 2023
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the Consolidated Statement of Income
AOCI components |  |
Unrealized (gain) on fuel derivative instruments |  | $ | (128) |  |  | Fuel and oil expense
|  | (29) |  |  | Less: Tax expense
|  | $ | (99) |  |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | 7 |  |  | Other operating expenses
|  | 1 |  |  | Less: Tax expense
|  | $ | 6 |  |  | Net of tax
Unrealized (gain) on defined benefit plan |  | $ | (10) |  |  | Other (gains) losses, net
|  | $ | (3) |  |  | Less: Tax expense
|  | $ | (7) |  |  | Net of tax
Other |  | $ | — |  |  | Other
|  | 4 |  |  | Less: Tax expense
|  | $ | (4) |  |  | Net of tax
Total reclassifications for the period |  | $ | (104) |  |  | Net of tax

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