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Financial Instruments - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of accounts receivable from ten largest customers | 91.00% | 82.00% |
Expected credit loss decrease increase | $ (35.8) | $ (57.9) | $ 3.3
Level 3 [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% | $ (52.7) | $ (48.7) |
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 | $ (954.9) | $ (631.5) | $ (595.8)
Equity Price Risk [member] | Impact on Net Income [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Assumed change in risk, monetary effect | $ 1,073.4 |  |
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 | $ (891.0) | $ (1,704.6) | $ (1,435.3)
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 | $ (3,842.0) | $ (3,831.3) | $ (3,767.1)

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