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Earnings Per Share - Computation of Earnings Per Share (Detail) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 TWD ($) $ / shares shares	Dec. 31, 2018 $ / shares	Dec. 31, 2017 TWD ($) $ / shares shares	Dec. 31, 2016 TWD ($) $ / shares shares
Earnings per share [abstract]
Net income available to common shareholders of the parent | $	$ 363,052.7		$ 344,998.3	$ 331,713.7
Net income available to common shareholders of the parent | shares	25,930.3		25,930.3	25,930.3
Basic EPS | (per share)	$ 14.00	$ 0.46	$ 13.30	$ 12.79
Diluted EPS | (per share)	$ 14.00	$ 0.46	$ 13.30	$ 12.79

X

- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

+ References

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

+ References

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- Definition

The profit (loss) from continuing operations attributable to ordinary equity holders of the parent equity. [Refer: Continuing operations [member]; Profit (loss) from continuing operations]

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- Definition

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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