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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, 2024 $ / shares	Dec. 31, 2024 TWD ($) $ / shares shares	Dec. 31, 2023 TWD ($) $ / shares shares	Dec. 31, 2022 TWD ($) $ / shares shares
Earnings per share [abstract]
Net income available to common shareholders of the parent | $		$ 1,158,380.2	$ 851,740.0	$ 992,923.4
Weighted average number of common shares outstanding used in the computation of basic EPS		25,927.6	25,929.2	25,929.2
Basic EPS | (per share)	$ 1.36	$ 44.68	$ 32.85	$ 38.29
Diluted EPS | (per share)	$ 1.36	$ 44.67	$ 32.85	$ 38.29
Effects of all dilutive potential common shares		2.1	0.1	0.2
Weighted average number of common shares used in the computation of diluted EPS		25,929.7	25,929.3	25,929.4

X

- Definition

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 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 profit (loss) from continuing operations attributable to ordinary equity holders of the parent entity. [Refer: Continuing operations, unless line item indicates otherwise [member]; Profit (loss) from continuing operations]

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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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