Financial Instruments - Summary of Level 3 Fair Value Were Equity Investments classified as Financial Assets at FVTOCI (Detail) - TWD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Disclosure of fair value of investments in equity instruments designated at FVTOCI and at FVTPL | |||
| Beginning balance | $ 129,157.7 | ||
| Ending balance | 161,739.5 | $ 129,157.7 | |
| Level 3 [member] | |||
| Disclosure of fair value of investments in equity instruments designated at FVTOCI and at FVTPL | |||
| Beginning balance | 6,282.1 | 5,887.9 | $ 4,514.9 |
| Additions | 14,887.2 | 715.6 | 319.2 |
| Recognized in profit or loss | 12.3 | 0.0 | |
| Recognized in other comprehensive income or loss | 262.4 | (373.2) | 1,821.8 |
| Disposals and proceeds from return of capital of investments | (128.0) | (359.5) | (700.2) |
| Transfers out of level 3 (Note) | 0.0 | (139.8) | |
| Effect of exchange rate changes | (466.4) | 551.1 | (67.8) |
| Ending balance | $ 20,849.6 | $ 6,282.1 | $ 5,887.9 |