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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
Components of Accumulated Other Comprehensive Income, Net of Tax | The tables below present the components of the Company’s accumulated other comprehensive income (loss), net of tax (“AOCI”) (in millions):
UAL |  | Pension and Other Postretirement Liabilities |  |  | Investments and Other |  |  | Income Taxes |  |  | Total |
Balance at December 31, 2017 |  | $ | (1,102) |  |  | $ | (6) |  |  | $ | (39) |  |  | $ | (1,147) |
Changes in value |  |  | 23 |  |  |  | (4) |  |  |  | (6) |  |  |  | 13 |
Amounts reclassified to earnings |  |  | 16 |  |  |  | — |  |  |  | (3) |  |  |  | 13 |
Amounts reclassified to retained earnings (a) |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 7 |
Net change |  |  | 39 |  |  |  | 3 |  |  |  | (9) |  |  |  | 33 |
Balance at March 31, 2018 |  | $ | (1,063) |  |  | $ | (3) |  |  | $ | (48) |  |  | $ | (1,114) |
Balance at December 31, 2016 |  | $ | (854) |  |  | $ | (1) |  |  | $ | 26 |  |  | $ | (829) |
Changes in value |  |  | (26) |  |  |  | — |  |  |  | 10 |  |  |  | (16) |
Amounts reclassified to earnings |  |  | 13 |  |  |  | 2 |  |  |  | (6) |  |  |  | 9 |
Net change |  |  | (13) |  |  |  | 2 |  |  |  | 4 |  |  |  | (7) |
Balance at March 31, 2017 |  | $ | (867) |  |  | $ | 1 |  |  | $ | 30 |  |  | $ | (836) |
(a) This amount represents the unrealized loss on the Company’s investment in Azul, S.A. (“Azul”) which was previously classified as an available-for-sale security.

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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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