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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2021
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 2021 and 2020:
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  | Other |  | Deferred tax impact |  | Accumulated other comprehensive income (loss)
Balance at December 31, 2019 | $ | (125) |  |  | $ | (33) |  |  | $ | 20 |  |  | $ | 59 |  |  | $ | 18 |  |  | $ | (61) |
Changes in fair value | (103) |  |  | (34) |  |  | (63) |  |  | 32 |  |  | 39 |  |  | (129) |
Reclassification to earnings | 109 |  |  | 1 |  |  | — |  |  | — |  |  | (25) |  |  | 85 |
Balance at December 31, 2020 | $ | (119) |  |  | $ | (66) |  |  | $ | (43) |  |  | $ | 91 |  |  | $ | 32 |  |  | $ | (105) |
Cumulative effect of adopting ASU 2016-01 as of January 1, 2018 | — |  |  | — |  |  | — |  |  | (31) |  |  | 11 |  |  | (20) |
Changes in fair value | 601 |  |  | 3 |  |  | 109 |  |  | — |  |  | (166) |  |  | 547 |
Reclassification to earnings | 10 |  |  | 6 |  |  | — |  |  | (60) |  | (a) | 10 |  |  | (34) |
Balance at December 31, 2021 | $ | 492 |  |  | $ | (57) |  |  | $ | 66 |  |  | $ | — |  |  | $ | (113) |  |  | $ | 388 |
(a) Investment gains related to prior periods that were reclassified from AOCI into Other (gains) losses, net. See Note 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, 2021:
Year ended December 31, 2021
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the Consolidated Statement of Income (Loss)
AOCI components |  |
Unrealized loss on fuel derivative instruments |  | $ | 4 |  |  | Fuel and oil expense
|  | 6 |  |  | Other (gains) losses, net
|  | 2 |  |  | Less: Tax expense
|  | $ | 8 |  |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | 6 |  |  | Other operating expenses
|  | 1 |  |  | Less: Tax expense
|  | $ | 5 |  |  | Net of tax
Unrealized gain on deferred compensation plan investment |  | $ | (60) |  |  | Other (gains) losses, net
|  | (13) |  |  | Less: Tax expense
|  | $ | (47) |  |  | Net of tax
Total reclassifications for the period |  | $ | (34) |  |  | Net of tax

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