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Earnings (Loss) Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Earnings (Loss) Per Share | EARNINGS (LOSS) PER SHARE The computations of UAL's basic and diluted earnings (loss) per share are set forth below for the years ended December 31 (in millions, except per share amounts):
|  | 2020 |  | 2019 |  | 2018
Earnings (loss) available to common stockholders |  | $ | (7,069) |  |  | $ | 3,009 |  |  | $ | 2,122 |
Basic weighted-average shares outstanding |  | 279.4 |  |  | 258.8 |  |  | 275.5 |
Effect of share-based awards |  | — |  |  | 1.1 |  |  | 1.2 |
Diluted weighted-average shares outstanding |  | 279.4 |  |  | 259.9 |  |  | 276.7 |
Earnings (loss) per share, basic |  | $ | (25.30) |  |  | $ | 11.63 |  |  | $ | 7.70 |
Earnings (loss) per share, diluted |  | $ | (25.30) |  |  | $ | 11.58 |  |  | $ | 7.67 |
The number of antidilutive securities excluded from the computation of diluted per share amounts was not material.

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