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Financial Instruments - Additional Information (Detail) - TWD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]      
Percentage of accounts receivable from ten largest customers 82.00% 79.00%  
Expected credit loss decrease increase $ (57.9) $ (3.3) $ 1.1
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% $ (48.7) $ (51.4)  
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%)
Assumed change in risk, monetary effect $ (631.5) $ (595.8) $ (446.5)
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 $ (1,704.6) $ (1,435.3) $ (897.7)
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%
Assumed change in risk, monetary effect $ (3,831.3) $ (3,767.1) $ (3,143.6)