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Financial Assets at Fair Value through Other Comprehensive Income Noncurrent - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 31, 2021 | Aug. 31, 2021 | Jul. 31, 2021
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Unrealized gains (losses) on financial assets at FVOCI |  | $ (0.1) | $ 60.0 |  |  |
Dividends received | $ 167.0 | 157.0 | 154.0 |  |  |
UUPON Inc. (UUPON) [Member] |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Fair value amount |  | $ 0.2 |  | $ 1.0 |  |
China Airlines, Ltd. [Member] |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Fair value amount |  |  | 2,636.0 |  |  |
Cotech Engineering Fuzhou Corp. [Member] |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Fair value amount |  |  | $ 4.0 |  |  |
AgriTalk Technology Inc. ("ATT") [Member] |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Investments reclassified from financial asset at FVOCI to investments in associates at fair value |  |  |  |  |  | $ 19.0
Imedtac Co., Ltd. ("IME") [Member] |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Investments reclassified from financial asset at FVOCI to investments in associates at fair value |  |  |  |  | $ 45.0 |
PChome Online Inc. |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Private placement |  |  |  | $ 200.0 |  |

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