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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2018
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 |  | Income Taxes |  | Total
| Balance at June 30, 2018 |  | $ | (1,048 | ) |  | $ | (2 | ) |  | $ | (52 | ) |  | $ | (1,102 | )
| Changes in value |  | — |  |  | 1 |  |  | — |  |  | 1 |
| Amounts reclassified to earnings |  | 15 |  |  | — |  |  | (3 | ) |  | 12 |
| Net change |  | 15 |  |  | 1 |  |  | (3 | ) |  | 13 |
| 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 |  |  | — |  |  | (10 | ) |  | 35 |
| Amounts reclassified to retained earnings |  | — |  |  | 7 |  |  | — |  |  | 7 |
| Net change |  | 69 |  |  | 5 |  |  | (16 | ) |  | 58 |
| Balance at September 30, 2018 |  | $ | (1,033 | ) |  | $ | (1 | ) |  | $ | (55 | ) |  | $ | (1,089 | )
| Balance at June 30, 2017 |  | $ | (860 | ) |  | $ | (16 | ) |  | $ | 32 |  |  | $ | (844 | )
| Changes in value |  | (9 | ) |  | 26 |  |  | (6 | ) |  | 11 |
| Amounts reclassified to earnings |  | 14 |  |  | — |  |  | (5 | ) |  | 9 |
| Net change |  | 5 |  |  | 26 |  |  | (11 | ) |  | 20 |
| Balance at September 30, 2017 |  | $ | (855 | ) |  | $ | 10 |  |  | $ | 21 |  |  | $ | (824 | )
| Balance at December 31, 2016 |  | $ | (854 | ) |  | $ | (1 | ) |  | $ | 26 |  |  | $ | (829 | )
| Changes in value |  | (42 | ) |  | 9 |  |  | 12 |  |  | (21 | )
| Amounts reclassified to earnings |  | 41 |  |  | 2 |  |  | (17 | ) |  | 26 |
| Net change |  | (1 | ) |  | 11 |  |  | (5 | ) |  | 5 |
| Balance at September 30, 2017 |  | $ | (855 | ) |  | $ | 10 |  |  | $ | 21 |  |  | $ | (824 | )
Details for AOCI Components Reclassified to Income |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |  | Affected Line Item in the Statements of Consolidated Operations
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Pension and other postretirement liabilities |  |  |  |  |  |  |  |  |  |
Amortization of unrecognized losses and prior service cost (a) |  | $ | 15 |  |  | $ | 14 |  |  | $ | 45 |  |  | $ | 41 |  |  | Miscellaneous, net
Investments and Other |  |  |  |  |  |  |  |  |  |
Reclassifications of losses into earnings related to fuel derivative contracts |  | — |  |  | — |  |  | — |  |  | 2 |  |  | Aircraft fuel
(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 this 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://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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