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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2017
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 2017 and 2016:
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  | Other |  | Deferred tax impact |  | Accumulated other comprehensive income (loss)
Balance at December 31, 2015 | $ | (1,666 | ) |  | $ | (30 | ) |  | $ | 22 |  |  | $ | 6 |  |  | $ | 617 |  |  | $ | (1,051 | )
Changes in fair value | 194 |  |  | (3 | ) |  | (36 | ) |  | 14 |  |  | (63 | ) |  | 106 |
Reclassification to earnings | 973 |  |  | 15 |  |  | — |  |  | — |  |  | (366 | ) |  | 622 |
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 |
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, 2017:
Year ended December 31, 2017
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the Consolidated Statement of Comprehensive Income
AOCI components |  |
Unrealized loss on fuel derivative instruments |  | $ | 552 |  |  | Fuel and oil expense
|  | 203 |  |  | Less: Tax expense
|  | $ | 349 |  |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | $ | 11 |  |  | Interest expense
|  | 4 |  |  | Less: Tax expense
|  | $ | 7 |  |  | Net of tax
Total reclassifications for the period |  | $ | 356 |  |  | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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