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Investments Accounted for Using Equity Method - Market Prices of Investments Accounted for Using Equity Method in Publicly Traded Stocks Calculated by Closing Price at End of Reporting Period (Detail) - Level 1 [member] - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Global Unichip Corporation [member]    
Disclosure of associates [line items]    
Closing Price in Active Markets $ 81,236.9 $ 29,926.9
Vanguard International Semiconductor Corporation [member]    
Disclosure of associates [line items]    
Closing Price in Active Markets 37,834.2 35,977.3
Xintec Inc. [member]    
Disclosure of associates [line items]    
Closing Price in Active Markets $ 14,188.4 $ 10,716.4