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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity [Abstract] |
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 |  | Deferred Taxes |  | Total
| Balance at March 31, 2019 |  | $ | (654 | ) |  | $ | 1 |  |  | $ | (140 | ) |  | $ | (793 | )
| Changes in value |  | (29 | ) |  | 2 |  |  | 7 |  |  | (20 | )
| Amounts reclassified to earnings |  | 8 |  |  | — |  |  | (2 | ) |  | 6 |
| Balance at June 30, 2019 |  | $ | (675 | ) |  | $ | 3 |  |  | $ | (135 | ) |  | $ | (807 | )
| Balance at December 31, 2018 |  | $ | (663 | ) |  | $ | (4 | ) |  | $ | (136 | ) |  | $ | (803 | )
| Changes in value |  | (24 | ) |  | 7 |  |  | 4 |  |  | (13 | )
| Amounts reclassified to earnings |  | 12 |  | (a) | — |  |  | (3 | ) |  | 9 |
| Balance at June 30, 2019 |  | $ | (675 | ) |  | $ | 3 |  |  | $ | (135 | ) |  | $ | (807 | )
| Balance at March 31, 2018 |  | $ | (1,063 | ) |  | $ | (3 | ) |  | $ | (48 | ) |  | $ | (1,114 | )
| Changes in value |  | 1 |  |  | 1 |  |  | — |  |  | 2 |
| Amounts reclassified to earnings |  | 14 |  |  | — |  |  | (4 | ) |  | 10 |
| Balance at June 30, 2018 |  | $ | (1,048 | ) |  | $ | (2 | ) |  | $ | (52 | ) |  | $ | (1,102 | )
| Balance at December 31, 2017 |  | $ | (1,102 | ) |  | $ | (6 | ) |  | $ | (39 | ) |  | $ | (1,147 | )
| Changes in value |  | 24 |  |  | (3 | ) |  | (6 | ) |  | 15 |
| Amounts reclassified to earnings |  | 30 |  | (a) | — |  |  | (7 | ) |  | 23 |
| Amounts reclassified to retained earnings |  | — |  |  | 7 |  |  | — |  |  | 7 |
| Balance at June 30, 2018 |  | $ | (1,048 | ) |  | $ | (2 | ) |  | $ | (52 | ) |  | $ | (1,102 | )
(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (See Note 6 to the financial statements included in Part I, Item 1 for additional information).

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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