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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Computation of Earnings Per Share |
|  | Years Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (NT$) |  |  | (NT$) |  |  | (NT$) |
Basic EPS |  | $ | 11.68 |  |  | $ | 12.79 |  |  | $ | 13.30 |
Diluted EPS |  | $ | 11.68 |  |  | $ | 12.79 |  |  | $ | 13.30 |
EPS is computed as follows:
|  | Amounts (Numerator) NT$ (In Millions) |  |  | Number of Shares (Denominator) (In Millions) |  |  | EPS (NT$) |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Basic EPS |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders of the parent |  | $ | 302,850.9 |  |  |  | 25,930.3 |  |  | $ | 11.68 |
Effect of dilutive potential common shares |  |  | — |  |  |  | 0.1 |  |  |  |  |
Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders of the parent (including effect of dilutive potential common shares) |  | $ | 302,850.9 |  |  |  | 25,930.4 |  |  | $ | 11.68 |
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Basic/Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders of the parent |  | $ | 331,713.7 |  |  |  | 25,930.3 |  |  | $ | 12.79 |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Basic/Diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common shareholders of the parent |  | $ | 344,998.3 |  |  |  | 25,930.3 |  |  | $ | 13.30 |

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- Definition Text block1 [abstract] + References No definition available. + Details
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