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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Components of AOCI | The tables below present the components of the Company's AOCI, net of tax (in millions):
| Pension and Other Postretirement Liabilities |  | Fuel Derivatives Contracts |  | Investments and Other |  | Deferred Taxes |  | Total
Balance at December 31, 2015 | $ | (363 | ) |  | $ | (215 | ) |  | $ | 3 |  |  | $ | (256 | ) |  | $ | (831 | )
Other comprehensive income (loss) before reclassifications | (517 | ) | (a) | (4 | ) |  | — |  |  | 187 |  |  | (334 | )
Amounts reclassified from accumulated other comprehensive income | 26 |  |  | 217 |  |  | (2 | ) |  | 95 |  |  | 336 |
Balance at December 31, 2016 | (854 | ) |  | (2 | ) |  | 1 |  |  | 26 |  |  | (829 | )
Other comprehensive income (loss) before reclassifications | (306 | ) | (a) | — |  |  | (7 | ) |  | 74 |  |  | (239 | )
Amounts reclassified from accumulated other comprehensive income | 58 |  |  | 2 |  |  | — |  |  | (21 | ) |  | 39 |
Reclassification of stranded tax effects | — |  |  | — |  |  | — |  |  | (118 | ) | (b) | (118 | )
Balance at December 31, 2017 | (1,102 | ) |  | — |  |  | (6 | ) |  | (39 | ) |  | (1,147 | )
Other comprehensive income (loss) before reclassifications | 377 |  | (a) | — |  |  | (5 | ) |  | (83 | ) |  | 289 |
Amounts reclassified from accumulated other comprehensive income | 62 |  |  | — |  |  | — |  |  | (13 | ) |  | 49 |
Amounts reclassified to retained earnings | — |  |  | — |  |  | 7 |  |  | (1 | ) |  | 6 |
Balance at December 31, 2018 | $ | (663 | ) |  | $ | — |  |  | $ | (4 | ) |  | $ | (136 | ) |  | $ | (803 | )
Details about AOCI Components |  | Amount Reclassified from AOCI to Income |  | Affected Line Item in the Statement Where Net Income is Presented
|  | Year Ended December 31, |  |
|  | 2018 |  | 2017 |  | 2016 |  |
Fuel derivative contracts |  |  |  |  |  |  |  |
Fuel contracts-reclassifications of losses into earnings |  | $ | — |  |  | $ | 2 |  |  | $ | 217 |  |  | Aircraft fuel
Pension and Postretirement liabilities and other |  |  |  |  |  |  |  |
Amortization of unrecognized (gains) losses and prior service cost (c) |  | 62 |  |  | 58 |  |  | 26 |  |  | Miscellaneous, net
Investments and other |  |  |  |  |  |  |  |
Available-for-sale securities - reclassifications of gains into earnings |  | — |  |  | — |  |  | (2 | ) |  | Miscellaneous, net
(a) Prior service credits decreased by $3 million, $0 million and increased by $30 million and actuarial losses decreased by approximately $380 million, and increased $306 million and $560 million for 2018, 2017 and 2016, respectively. (b) This amount represents the reclassification from AOCI to RE of the stranded tax effects resulting from the enactment of the Tax Cuts and Jobs Act (the "Tax Act"). (c) This AOCI component is included in the computation of net periodic pension and other postretirement costs (see Note 8 of this report for additional information).

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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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