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Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
Components of Comprehensive Income | The differences between Net income and Comprehensive income for the three months ended March 31, 2019 and 2018 were as follows:
| Three months ended March 31,
(in millions) | 2019 |  | 2018
NET INCOME | $ | 387 |  |  | $ | 463 |
Unrealized gain on fuel derivative instruments, net of deferred taxes of $22 and $25 | 76 |  |  | 81 |
Unrealized gain (loss) on interest rate derivative instruments, net of deferred taxes of ($3) and $- | (11 | ) |  | 3 |
Other, net of deferred taxes of $3 and $- | 11 |  |  | — |
Total other comprehensive income | $ | 76 |  |  | $ | 84 |
COMPREHENSIVE INCOME | $ | 463 |  |  | $ | 547 |
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, 2019:
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  | Other |  | Deferred tax |  | Accumulated other comprehensive income (loss)
Balance at December 31, 2018 | $ | (56 | ) |  | $ | — |  |  | $ | 58 |  |  | $ | 25 |  |  | $ | (7 | ) |  | $ | 20 |
Changes in fair value | 87 |  |  | (15 | ) |  | — |  |  | 14 |  |  | (19 | ) |  | 67 |
Reclassification to earnings | 11 |  |  | 1 |  |  | — |  |  | — |  |  | (3 | ) |  | 9 |
Balance at March 31, 2019 | $ | 42 |  |  | $ | (14 | ) |  | $ | 58 |  |  | $ | 39 |  |  | $ | (29 | ) |  | $ | 96 |
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, 2019:
Three months ended March 31, 2019
(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 |  | $ | 11 |  |  | Fuel and oil expense
|  | 3 |  |  | Less: Tax expense
|  | $ | 8 |  |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | $ | 1 |  |  | Interest expense
|  | — |  |  | Less: Tax expense
|  | $ | 1 |  |  | Net of tax
Total reclassifications for the period |  | $ | 9 |  |  | 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e526-108580 + Details
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