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Accumulated Other Comprehensive Income (Loss) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) 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 March 31, 2018 |  | $ | (1,063 | ) |  | $ | (3 | ) |  | $ | (48 | ) |  | $ | (1,114 | )
| Changes in value |  | 1 |  |  | 1 |  |  | — |  |  | 2 |
| Amounts reclassified to earnings |  | 14 |  |  | — |  |  | (4 | ) |  | 10 |
| Net change |  | 15 |  |  | 1 |  |  | (4 | ) |  | 12 |
| 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 |  |  | — |  |  | (7 | ) |  | 23 |
| Amounts reclassified to retained earnings |  | — |  |  | 7 |  |  | — |  |  | 7 |
| Net change |  | 54 |  |  | 4 |  |  | (13 | ) |  | 45 |
| Balance at June 30, 2018 |  | $ | (1,048 | ) |  | $ | (2 | ) |  | $ | (52 | ) |  | $ | (1,102 | )
| Balance at March 31, 2017 |  | $ | (867 | ) |  | $ | 1 |  |  | $ | 30 |  |  | $ | (836 | )
| Changes in value |  | (7 | ) |  | (17 | ) |  | 8 |  |  | (16 | )
| Amounts reclassified to earnings |  | 14 |  |  | — |  |  | (6 | ) |  | 8 |
| Net change |  | 7 |  |  | (17 | ) |  | 2 |  |  | (8 | )
| Balance at June 30, 2017 |  | $ | (860 | ) |  | $ | (16 | ) |  | $ | 32 |  |  | $ | (844 | )
| Balance at December 31, 2016 |  | $ | (854 | ) |  | $ | (1 | ) |  | $ | 26 |  |  | $ | (829 | )
| Changes in value |  | (33 | ) |  | (17 | ) |  | 18 |  |  | (32 | )
| Amounts reclassified to earnings |  | 27 |  |  | 2 |  |  | (12 | ) |  | 17 |
| Net change |  | (6 | ) |  | (15 | ) |  | 6 |  |  | (15 | )
| Balance at June 30, 2017 |  | $ | (860 | ) |  | $ | (16 | ) |  | $ | 32 |  |  | $ | (844 | )
Details for AOCI Components Reclassified to Income |  | Three Months Ended June 30, |  | Six Months Ended June 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) |  | $ | 14 |  |  | $ | 14 |  |  | $ | 30 |  |  | $ | 27 |  |  | 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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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- References No definition available. + Details
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