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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary of Selected Quarterly Financial Data |
UAL |  | Quarter Ended
(In millions, except per share amounts) |  | March 31 |  | June 30 |  | September 30 |  | December 31
2018 |  |  |  |  |  |  |  |
Operating revenue |  | $ | 9,032 |  |  | $ | 10,777 |  |  | $ | 11,003 |  |  | $ | 10,491 |
Income from operations |  | 276 |  |  | 1,161 |  |  | 1,203 |  |  | 652 |
Net income |  | 147 |  |  | 684 |  |  | 836 |  |  | 462 |
Basic earnings per share |  | 0.52 |  |  | 2.49 |  |  | 3.07 |  |  | 1.71 |
Diluted earnings per share |  | 0.52 |  |  | 2.48 |  |  | 3.06 |  |  | 1.70 |
2017 (a) |  |  |  |  |  |  |  |
Operating revenue |  | $ | 8,426 |  |  | $ | 10,008 |  |  | $ | 9,899 |  |  | $ | 9,451 |
Income from operations |  | 320 |  |  | 1,437 |  |  | 1,138 |  |  | 776 |
Net income |  | 99 |  |  | 821 |  |  | 645 |  |  | 579 |
Basic earnings per share |  | 0.32 |  |  | 2.67 |  |  | 2.15 |  |  | 1.99 |
Diluted earnings per share |  | 0.32 |  |  | 2.67 |  |  | 2.15 |  |  | 1.98 |
(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
Impact of Significant Items on Quarterly Results |
UAL |  | Quarter Ended
(In millions, except per share amounts) |  | March 31 |  | June 30 |  | September 30 |  | December 31
2018 |  |  |  |  |  |  |  |
Operating revenue |  | $ | 9,032 |  |  | $ | 10,777 |  |  | $ | 11,003 |  |  | $ | 10,491 |
Income from operations |  | 276 |  |  | 1,161 |  |  | 1,203 |  |  | 652 |
Net income |  | 147 |  |  | 684 |  |  | 836 |  |  | 462 |
Basic earnings per share |  | 0.52 |  |  | 2.49 |  |  | 3.07 |  |  | 1.71 |
Diluted earnings per share |  | 0.52 |  |  | 2.48 |  |  | 3.06 |  |  | 1.70 |
2017 (a) |  |  |  |  |  |  |  |
Operating revenue |  | $ | 8,426 |  |  | $ | 10,008 |  |  | $ | 9,899 |  |  | $ | 9,451 |
Income from operations |  | 320 |  |  | 1,437 |  |  | 1,138 |  |  | 776 |
Net income |  | 99 |  |  | 821 |  |  | 645 |  |  | 579 |
Basic earnings per share |  | 0.32 |  |  | 2.67 |  |  | 2.15 |  |  | 1.99 |
Diluted earnings per share |  | 0.32 |  |  | 2.67 |  |  | 2.15 |  |  | 1.98 |
(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information. UAL's quarterly financial data is subject to seasonal fluctuations and historically its second and third quarter financial results, which reflect higher travel demand, are better than its first and fourth quarter financial results. UAL's quarterly results were impacted by the following significant items (in millions):
|  | Quarter Ended
|  | March 31 |  | June 30 |  | September 30 |  | December 31
2018 |  |  |  |  |  |  |  |
Operating: |  |  |  |  |  |  |  |
Impairment of assets |  | $ | 23 |  |  | $ | 111 |  |  | $ | 11 |  |  | $ | 232 |
Termination of an engine maintenance service agreement |  | — |  |  | — |  |  | — |  |  | 64 |
Severance and benefit costs |  | 14 |  |  | 11 |  |  | 9 |  |  | 7 |
(Gains) losses on sale of assets and other special charges |  | 3 |  |  | 7 |  |  | (3 | ) |  | (2 | )
Total operating special charges |  | 40 |  |  | 129 |  |  | 17 |  |  | 301 |
Nonoperating: |  |  |  |  |  |  |  |
Nonoperating mark-to-market ("MTM") (gains) losses on financial instruments |  | (45 | ) |  | 135 |  |  | (29 | ) |  | (56 | )
Total special charges and MTM (gains) losses on financial instruments |  | (5 | ) |  | 264 |  |  | (12 | ) |  | 245 |
Income taxes: |  |  |  |  |  |  |  |
Income tax expense (benefit) related to special charges and MTM gains and losses on financial instruments |  | 1 |  |  | (59 | ) |  | 3 |  |  | (55 | )
Income tax adjustments |  | — |  |  | — |  |  | — |  |  | (5 | )
Total special charges and MTM (gains) losses on financial instruments, net of tax |  | $ | (4 | ) |  | $ | 205 |  |  | $ | (9 | ) |  | $ | 185 |
2017 (a) |  |  |  |  |  |  |  |
Operating: |  |  |  |  |  |  |  |
Severance and benefit costs |  | $ | 37 |  |  | $ | 41 |  |  | $ | 23 |  |  | $ | 15 |
Impairment of assets |  | — |  |  | — |  |  | 15 |  |  | 10 |
(Gains) losses on sale of assets and other special charges |  | 14 |  |  | 3 |  |  | 12 |  |  | 6 |
Total operating special charges |  | 51 |  |  | 44 |  |  | 50 |  |  | 31 |
Income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit related to special charges |  | (18 | ) |  | (16 | ) |  | (18 | ) |  | (11 | )
Income tax adjustments |  | — |  |  | — |  |  | — |  |  | (179 | )
Total operating special charges, net of income taxes and income tax adjustments |  | $ | 33 |  |  | $ | 28 |  |  | $ | 32 |  |  | $ | (159 | )
(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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