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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Computation of Earnings 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 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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