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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
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):
|  | 2018 |  | 2017 (a) |  | 2016 (a)
Earnings available to common stockholders |  | $ | 2,129 |  |  | $ | 2,144 |  |  | $ | 2,234 |
Basic weighted-average shares outstanding |  | 275.5 |  |  | 302.7 |  |  | 329.9 |
Effect of employee stock awards |  | 1.2 |  |  | 0.9 |  |  | 0.4 |
Diluted weighted-average shares outstanding |  | 276.7 |  |  | 303.6 |  |  | 330.3 |
Earnings per share, basic |  | $ | 7.73 |  |  | $ | 7.08 |  |  | $ | 6.77 |
Earnings per share, diluted |  | $ | 7.70 |  |  | $ | 7.06 |  |  | $ | 6.76 |
(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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- 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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