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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, 2021 $ / shares	Dec. 31, 2021 TWD ($) $ / shares shares	Dec. 31, 2020 TWD ($) $ / shares shares	Dec. 31, 2019 TWD ($) $ / shares shares
Earnings per share [abstract]
Net income available to common shareholders of the parent | $		$ 592,359.2	$ 510,744.0	$ 353,948.0
Net income available to common shareholders of the parent | shares		25,930.3	25,930.3	25,930.3
Basic EPS | (per share)	$ 0.82	$ 22.84	$ 19.70	$ 13.65
Diluted EPS | (per share)	$ 0.82	$ 22.84	$ 19.70	$ 13.65

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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).

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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]]

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The profit (loss) from continuing operations attributable to ordinary equity holders of the parent entity. [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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