Earnings Per Share - Computation of Earnings Per Share (Detail) $ / shares in Units, shares in Millions, $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2023
$ / shares
|
Dec. 31, 2023
TWD ($)
$ / shares
shares
|
Dec. 31, 2022
TWD ($)
$ / shares
shares
|
Dec. 31, 2021
TWD ($)
$ / shares
shares
|
|
| Earnings per share [abstract] | ||||
| Net income available to common shareholders of the parent | $ | $ 851,740.0 | $ 992,923.4 | $ 592,359.2 | |
| Weighted average number of common shares outstanding used in the computation of basic EPS | 25,929.2 | 25,929.2 | 25,930.3 | |
| Basic EPS | (per share) | $ 1.07 | $ 32.85 | $ 38.29 | $ 22.84 |
| Diluted EPS | (per share) | $ 1.07 | $ 32.85 | $ 38.29 | $ 22.84 |
| Effects of all dilutive potential common shares | 0.1 | 0.2 | ||
| Weighted average number of common shares used in the computation of diluted EPS | 25,929.3 | 25,929.4 | 25,930.3 | |