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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Computation of Earnings Per Share | The computations of UAL’s basic and diluted earnings per share are set forth below for the years ended December 31 (in millions, except per share amounts):
|  | 2017 |  |  | 2016 |  |  | 2015 |
Earnings available to common stockholders |  | $ | 2,131 |  |  | $ | 2,263 |  |  | $ | 7,340 |
Basic weighted-average shares outstanding |  |  | 302.7 |  |  |  | 329.9 |  |  |  | 376.1 |
Effect of convertible notes |  |  | — |  |  |  | — |  |  |  | 0.3 |
Effect of employee stock awards |  |  | 0.9 |  |  |  | 0.4 |  |  |  | 0.5 |
Diluted weighted-average shares outstanding |  |  | 303.6 |  |  |  | 330.3 |  |  |  | 376.9 |
Earnings per share, basic |  | $ | 7.04 |  |  | $ | 6.86 |  |  | $ | 19.52 |
Earnings per share, diluted |  | $ | 7.02 |  |  | $ | 6.85 |  |  | $ | 19.47 |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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