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Financial Instruments - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of accounts receivable from ten largest customers | 93.00% | 91.00% |
Expected credit loss decrease increase | $ (58.5) | $ (35.8) | $ 57.9
Discount for lack of control [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Significant unobservable input assets | 0.20 |  |
Discount for lack of control [member] | Income approach [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase decrease in fair value measurement due to reasonably possible decrease in significant unobservable input assets | $ (140.8) |  |
Percentage of reasonably possible decrease in unobservable input assets | 1.00% |  |
Discount rate, measurement input [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Significant unobservable input assets | 0.086 |  |
Discount rate, measurement input [member] | Income approach [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Increase decrease in fair value measurement due to reasonably possible decrease in significant unobservable input assets | $ (1,606.9) |  |
Percentage of reasonably possible decrease in unobservable input assets | 1.00% |  |
Level 3 [member] | Asset approach [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Discount for lack of marketability percentage | 10.00% | 10.00% |
Decrease in fair value due to lack of marketability increase by 1% | $ (56.2) | $ (52.7) |
Percentage increase in the discount for lack of marketability | 1.00% | 1.00% |
Equity Price Risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | 10.00% | 10.00% | 10.00%
Equity Price Risk [member] | Impact on Other Comprehensive Income [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk, monetary effect | $ (1,013.3) | $ (954.9) | $ (631.5)
Equity Price Risk [member] | Impact on Net Income [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk, monetary effect | $ (1,216.0) | $ (1,073.4) |
Currency Risk [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | 10.00% | 10.00% | 10.00%
Assumed change in risk, monetary effect | $ (1,906.3) | $ (891.0) | $ (1,704.6)
Interest rate risk [member] | Fixed Income Securities [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk | 1.00% | 1.00% | 1.00%
Interest rate risk [member] | Fixed Income Securities [member] | Impact on Other Comprehensive Income [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk, monetary effect | $ (4,500.9) | $ (3,842.0) | $ (3,831.3)

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