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Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Components of Comprehensive Income | The differences between Net income and Comprehensive income for the three and six months ended June 30, 2018 and 2017 were as follows:
| Three months ended June 30,
(in millions) | 2018 |  | 2017
NET INCOME | $ | 733 |  |  | $ | 743 |
Unrealized gain on fuel derivative instruments, net of deferred taxes of $66 and $27 | 216 |  |  | 46 |
Unrealized gain on interest rate derivative instruments, net of deferred taxes of $1 and $1 | 1 |  |  | 1 |
Other, net of deferred taxes of $- and $- | 3 |  |  | 2 |
Total other comprehensive income | $ | 220 |  |  | $ | 49 |
COMPREHENSIVE INCOME | $ | 953 |  |  | $ | 792 |
| Six months ended June 30,
(in millions) | 2018 |  | 2017
NET INCOME | $ | 1,195 |  |  | $ | 1,082 |
Unrealized gain on fuel derivative instruments, net of deferred taxes of $91 and $32 | 297 |  |  | 55 |
Unrealized gain on interest rate derivative instruments, net of deferred taxes of $1 and $2 | 4 |  |  | 3 |
Other, net of deferred taxes of $- and $- | 3 |  |  | 2 |
Total other comprehensive loss | $ | 304 |  |  | $ | 60 |
COMPREHENSIVE INCOME | $ | 1,499 |  |  | $ | 1,142 |
Rollforward of the Amounts Included in AOCI, Net of Taxes | A rollforward of the amounts included in AOCI is shown below for the three and six months ended June 30, 2018:
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  | Other |  | Deferred tax |  | Accumulated other comprehensive income (loss)
Balance at March 31, 2018 | $ | 83 |  |  | $ | (4 | ) |  | $ | (9 | ) |  | $ | 33 |  |  | $ | (25 | ) |  | $ | 78 |
Changes in fair value | 298 |  |  | 1 |  |  | — |  |  | 3 |  |  | (70 | ) |  | 232 |
Reclassification to earnings | (16 | ) |  | 1 |  |  | — |  |  | — |  |  | 3 |  |  | (12 | )
Balance at June 30, 2018 | $ | 365 |  |  | $ | (2 | ) |  | $ | (9 | ) |  | $ | 36 |  |  | $ | (92 | ) |  | $ | 298 |
(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 | 400 |  |  | 2 |  |  | — |  |  | 3 |  |  | (94 | ) |  | 311 |
Reclassification to earnings | (12 | ) |  | 3 |  |  | — |  |  | — |  |  | 2 |  |  | (7 | )
Balance at June 30, 2018 | $ | 365 |  |  | $ | (2 | ) |  | $ | (9 | ) |  | $ | 36 |  |  | $ | (92 | ) |  | $ | 298 |
(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 tables illustrate the significant amounts reclassified out of each component of AOCI for the three and six months ended June 30, 2018:
Three months ended June 30, 2018
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income
AOCI components |  |
Unrealized gain on fuel derivative instruments |  | $ | (16 | ) |  | Fuel and oil expense
|  | (4 | ) |  | Less: Tax expense
|  | $ | (12 | ) |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | $ | 1 |  |  | Interest expense
|  | 1 |  |  | Less: Tax expense
|  | $ | — |  |  | Net of tax
Total reclassifications for the period |  | $ | (12 | ) |  | Net of tax
Six months ended June 30, 2018
(in millions) |  | Amounts reclassified from AOCI |  | Affected line item in the unaudited Condensed Consolidated Statement of Comprehensive Income
AOCI components |  |
Unrealized gain on fuel derivative instruments |  | $ | (12 | ) |  | Fuel and oil expense
|  | (3 | ) |  | Less: Tax Expense
|  | $ | (9 | ) |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | $ | 3 |  |  | Interest expense
|  | 1 |  |  | Less: Tax Expense
|  | $ | 2 |  |  | Net of tax
Total reclassifications for the period |  | $ | (7 | ) |  | 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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