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Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Components of Comprehensive Income | The differences between Net income and Comprehensive income for the three and nine months ended September 30, 2017 and 2016 were as follows:
| Three months ended September 30,
(in millions) | 2017 |  | 2016
NET INCOME | $ | 503 |  |  | $ | 388 |
Unrealized gain on fuel derivative instruments, net of deferred taxes of $73 and $72 | 123 |  |  | 122 |
Unrealized gain on interest rate derivative instruments, net of deferred taxes of $- and $2 | 2 |  |  | 4 |
Other, net of deferred taxes of $2 and $2 | 2 |  |  | 3 |
Total other comprehensive income | $ | 127 |  |  | $ | 129 |
COMPREHENSIVE INCOME | $ | 630 |  |  | $ | 517 |
| Nine months ended September 30,
(in millions) | 2017 |  | 2016
NET INCOME | $ | 1,600 |  |  | $ | 1,722 |
Unrealized gain on fuel derivative instruments, net of deferred taxes of $105 and $321 | 178 |  |  | 546 |
Unrealized gain on interest rate derivative instruments, net of deferred taxes of $2 and $1 | 5 |  |  | 3 |
Other, net of deferred taxes of $2 and $2 | 4 |  |  | 3 |
Total other comprehensive income | $ | 187 |  |  | $ | 552 |
COMPREHENSIVE INCOME | $ | 1,787 |  |  | $ | 2,274 |
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 nine months ended September 30, 2017:
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  | Other |  | Deferred tax |  | Accumulated other comprehensive income (loss)
Balance at June 30, 2017 | $ | (412 | ) |  | $ | (13 | ) |  | $ | (14 | ) |  | $ | 22 |  |  | $ | 154 |  |  | $ | (263 | )
Changes in fair value | 45 |  |  | — |  |  | — |  |  | 4 |  |  | (18 | ) |  | 31 |
Reclassification to earnings | 151 |  |  | 2 |  |  | — |  |  | — |  |  | (57 | ) |  | 96 |
Balance at September 30, 2017 | $ | (216 | ) |  | $ | (11 | ) |  | $ | (14 | ) |  | $ | 26 |  |  | $ | 79 |  |  | $ | (136 | )
(in millions) | Fuel derivatives |  | Interest rate derivatives |  | Defined benefit plan items |  | Other |  | Deferred tax |  | Accumulated other comprehensive income (loss)
Balance at December 31, 2016 | $ | (499 | ) |  | $ | (18 | ) |  | $ | (14 | ) |  | $ | 20 |  |  | $ | 188 |  |  | $ | (323 | )
Changes in fair value | (165 | ) |  | (1 | ) |  | — |  |  | 6 |  |  | 59 |  |  | (101 | )
Reclassification to earnings | 448 |  |  | 8 |  |  | — |  |  | — |  |  | (168 | ) |  | 288 |
Balance at September 30, 2017 | $ | (216 | ) |  | $ | (11 | ) |  | $ | (14 | ) |  | $ | 26 |  |  | $ | 79 |  |  | $ | (136 | )
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 nine months ended September 30, 2017:
Three months ended September 30, 2017
(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 |  | $ | 151 |  |  | Fuel and oil expense
|  | 57 |  |  | Less: Tax expense
|  | $ | 94 |  |  | 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 |  | $ | 96 |  |  | Net of tax
Nine months ended September 30, 2017
(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 |  | $ | 448 |  |  | Fuel and oil expense
|  | 166 |  |  | Less: Tax Expense
|  | $ | 282 |  |  | Net of tax
Unrealized loss on interest rate derivative instruments |  | $ | 8 |  |  | Interest expense
|  | 2 |  |  | Less: Tax Expense
|  | $ | 6 |  |  | Net of tax
Total reclassifications for the period |  | $ | 288 |  |  | Net of tax

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