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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 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 June 30, 2019 |  | $ | (675 | ) |  | $ | 3 |  |  | $ | (135 | ) |  | $ | (807 | )
| Changes in value |  | 394 |  |  | — |  |  | (87 | ) |  | 307 |
| Amounts reclassified to earnings |  | (4 | ) | (a) | (1 | ) |  | 1 |  |  | (4 | )
| Balance at September 30, 2019 |  | $ | (285 | ) |  | $ | 2 |  |  | $ | (221 | ) |  | $ | (504 | )
| Balance at December 31, 2018 |  | $ | (663 | ) |  | $ | (4 | ) |  | $ | (136 | ) |  | $ | (803 | )
| Changes in value |  | 370 |  |  | 7 |  |  | (83 | ) |  | 294 |
| Amounts reclassified to earnings |  | 8 |  | (a) | (1 | ) |  | (2 | ) |  | 5 |
| Balance at September 30, 2019 |  | $ | (285 | ) |  | $ | 2 |  |  | $ | (221 | ) |  | $ | (504 | )
| Balance at June 30, 2018 |  | $ | (1,048 | ) |  | $ | (2 | ) |  | $ | (52 | ) |  | $ | (1,102 | )
| Changes in value |  | — |  |  | 1 |  |  | — |  |  | 1 |
| Amounts reclassified to earnings |  | 15 |  | (a) | — |  |  | (3 | ) |  | 12 |
| Balance at September 30, 2018 |  | $ | (1,033 | ) |  | $ | (1 | ) |  | $ | (55 | ) |  | $ | (1,089 | )
| Balance at December 31, 2017 |  | $ | (1,102 | ) |  | $ | (6 | ) |  | $ | (39 | ) |  | $ | (1,147 | )
| Changes in value |  | 24 |  |  | (2 | ) |  | (6 | ) |  | 16 |
| Amounts reclassified to earnings |  | 45 |  | (a) | — |  |  | (10 | ) |  | 35 |
| Amounts reclassified to retained earnings |  | — |  |  | 7 |  |  | — |  |  | 7 |
| Balance at September 30, 2018 |  | $ | (1,033 | ) |  | $ | (1 | ) |  | $ | (55 | ) |  | $ | (1,089 | )
(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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