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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [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 2018 and 2017:
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  | Other |  | Deferred tax impact |  | Accumulated other comprehensive income (loss)
Balance at December 31, 2016 | $ | (499 | ) |  | $ | (18 | ) |  | $ | (14 | ) |  | $ | 20 |  |  | $ | 188 |  |  | $ | (323 | )
Changes in fair value | (50 | ) |  | — |  |  | 5 |  |  | 13 |  |  | 11 |  |  | (21 | )
Reclassification to earnings | 552 |  |  | 11 |  |  | — |  |  | — |  |  | (207 | ) |  | 356 |
Balance at December 31, 2017 | $ | 3 |  |  | $ | (7 | ) |  | $ | (9 | ) |  | $ | 33 |  |  | $ | (8 | ) |  | $ | 12 |
ASU 2017-12 adoption adjustment (a) | (26 | ) |  | — |  |  | — |  |  | — |  |  | 6 |  |  | (20 | )
ASU 2018-02 stranded AOCI adoption adjustment (b) | — |  |  | — |  |  | — |  |  | — |  |  | 2 |  |  | 2 |
Changes in fair value | — |  |  | 1 |  |  | 67 |  |  | (8 | ) |  | (14 | ) |  | 46 |
Reclassification to earnings | (33 | ) |  | 6 |  |  | — |  |  | — |  |  | 7 |  |  | (20 | )
Balance at December 31, 2018 | $ | (56 | ) |  | $ | — |  |  | $ | 58 |  |  | $ | 25 |  |  | $ | (7 | ) |  | $ | 20 |
(a) The Company adopted the New Hedging Standard as of January 1, 2018. See Note 2 for further information on this adoption. (b) The Company adopted the Reclassification of Certain Tax Effects from AOCI as of January 1, 2018, which allowed the Company to reclassify to Retained earnings any tax effects stranded in AOCI as a result of the Tax Cuts and Jobs Act enacted in December 2017.
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, 2018:
Year ended December 31, 2018
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the Consolidated Statement of Comprehensive Income
AOCI components |  |
Unrealized gain on fuel derivative instruments |  | $ | (33 | ) |  | Fuel and oil expense
|  | (8 | ) |  | Less: Tax expense
|  | $ | (25 | ) |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | $ | 6 |  |  | Interest expense
|  | 1 |  |  | Less: Tax expense
|  | $ | 5 |  |  | Net of tax
Total reclassifications for the period |  | $ | (20 | ) |  | Net of tax

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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