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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Net Income and Weighted Average Number of Common Stocks Used in Calculation of Earnings Per Share | Net income and weighted average number of common stocks used in the calculation of earnings per share were as follows: Net Income
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Net income used to compute the basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to the parent |  | $ | 42,039 |  |  | $ | 40,485 |  |  | $ | 38,988 |
Assumed conversion of all dilutive potential common stocks |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options, employee bonus and compensation of subsidiaries |  |  | (1 | ) |  |  | (1 | ) |  |  | — |
Net income used to compute the diluted earnings per share |  | $ | 42,038 |  |  | $ | 40,484 |  |  | $ | 38,988 |
Weighted Average Number of Common Stocks (Millions Shares)
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
Weighted average number of common stocks used to compute the basic earnings per share |  |  | 7,757 |  |  |  | 7,757 |  |  |  | 7,757 |
Assumed conversion of all dilutive potential common stocks |  |  |  |  |  |  |  |  |  |  |  |
Employee bonus or employee compensation |  |  | 19 |  |  |  | 12 |  |  |  | 11 |
Weighted average number of common stocks used to compute the diluted earnings per share |  |  | 7,776 |  |  |  | 7,769 |  |  |  | 7,768 |

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2016-01-13 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2016-03-30&anchor=para_66&doctype=Standard -URIDate 2016-03-31 + Details
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