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Earnings Per Share - Net Income and Weighted Average Number of Common Stocks Used in Calculation of Earnings Per Share (Detail) shares in Millions, $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 TWD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 TWD ($) shares	Dec. 31, 2016 TWD ($) shares
Net income used to compute the basic earnings per share
Net income attributable to the parent	$ 37,557	$ 1,227	$ 38,988	$ 40,485
Assumed conversion of all dilutive potential common stocks
Employee stock options, employee compensation of subsidiaries | $	(6)		0	(1)
Net income used to compute the diluted earnings per share | $	$ 37,551		$ 38,988	$ 40,484
Weighted average number of common stocks used to compute the basic earnings per share	7,757	7,757	7,757	7,757
Assumed conversion of all dilutive potential common stocks
Employee compensation	9	9	11	12
Weighted average number of common stocks used to compute the diluted earnings per share	7,766	7,766	7,768	7,769

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- Definition

Assumed conversion of employee stock options, employee bonus and compensation of subsidiaries.

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Dilutive effect on net income.

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Dilutive effect on number of ordinary shares.

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The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

+ References

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The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) attributable to ordinary equity holders of the parent equity, adjusted for the effects of all dilutive potential ordinary shares. [Refer: Profit (loss)]

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The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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