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Contents of Significant Accounts - Bonds Payable - Additional Information (Detail)
 12 Months Ended
Jul. 07, 2026
Jul. 07, 2024
Jul. 07, 2021
USD ($)
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
TWD ($)
$ / shares
Dec. 31, 2022
TWD ($)
Jul. 07, 2021
$ / shares
Disclosure of detailed information about bonds [Line Items]                
Bonds issued amount           $ 38,359,352,000 $ 28,184,687,000  
Bonds repurchased and cancelled value       $ 0 $ 187,100,000      
Currency linked zero coupon exchangeable bonds maturing on July 7, 2026 [member]                
Disclosure of detailed information about bonds [Line Items]                
Bonds issued amount     $ 400,000,000          
Per annum interest rate related to early redemption of bonds     (0.625%)          
Early Redemption Price, fixed exchange rate     27.902          
Percentage of principal amount, bond will be redeemable for early redemption   98.14%            
Percentage of principal amount to redeem bonds on maturity date 96.92%              
Effective rate of the host bonds     3.49%          
Currency linked zero coupon exchangeable bonds maturing on July 7, 2026 [member] | Bottom of range [member]                
Disclosure of detailed information about bonds [Line Items]                
Percentage of closing stock price to quotient of early redemption amount multiplied by then exchange price divided by principal amount of bonds     130.00%          
Percentage of the bonds that have been previously redeemed, repurchased and cancelled or exchanged, where issuer may redeem the outstanding bonds     90.00%          
Currency linked zero coupon exchangeable bonds maturing on July 7, 2026 [member] | Common Shares of Novatek [Member]                
Disclosure of detailed information about bonds [Line Items]                
Exchange price per share | $ / shares           $ 533.8   $ 731.25