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ACCUMULATED OTHER COMPREHENSIVE INCOME | 12 Months Ended
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Dec. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
ACCUMULATED OTHER COMPREHENSIVE INCOME | ACCUMULATED OTHER COMPREHENSIVE INCOME Comprehensive income includes changes in the fair value of certain financial derivative instruments that qualify for hedge accounting and actuarial gains/losses arising from the Company’s postretirement benefit obligation. 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 |  |  | $ | — |
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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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