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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Components of Comprehensive Income | The differences between Net income and Comprehensive income for the three months ended March 31, 2018 and 2017 were as follows:
| Three months ended March 31,
(in millions) | 2018 |  | 2017
NET INCOME | $ | 463 |  |  | $ | 339 |
Unrealized gain on fuel derivative instruments, net of deferred taxes of $25 and $5 | 81 |  |  | 9 |
Unrealized gain on interest rate derivative instruments, net of deferred taxes of $- and $1 | 3 |  |  | 2 |
Total other comprehensive income | $ | 84 |  |  | $ | 11 |
COMPREHENSIVE INCOME | $ | 547 |  |  | $ | 350 |
Rollforward of the Amounts Included in AOCI, Net of Taxes | A rollforward of the amounts included in AOCI is shown below for the three months ended March 31, 2018:
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  | Other |  | Deferred tax |  | Accumulated other comprehensive income (loss)
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 | 102 |  |  | 1 |  |  | — |  |  | — |  |  | (24 | ) |  | 79 |
Reclassification to earnings | 4 |  |  | 2 |  |  | — |  |  | — |  |  | (1 | ) |  | 5 |
Balance at March 31, 2018 | $ | 83 |  |  | $ | (4 | ) |  | $ | (9 | ) |  | $ | 33 |  |  | $ | (25 | ) |  | $ | 78 |
(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. See Note 2 for further information on this adoption.
Reclassification out of Accumulated Other Comprehensive Income | The following table illustrates the significant amounts reclassified out of each component of AOCI for the three months ended March 31, 2018:
Three months ended March 31, 2018
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income
AOCI components |  |
Unrealized loss on fuel derivative instruments |  | $ | 4 |  |  | Fuel and oil expense
|  | 1 |  |  | Less: Tax expense
|  | $ | 3 |  |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | $ | 2 |  |  | Interest expense
|  | — |  |  | Less: Tax expense
|  | $ | 2 |  |  | Net of tax
Total reclassifications for the period |  | $ | 5 |  |  | Net of tax

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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