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Investments Accounted for Using Equity Method - Summary of Investments in Associates (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of associates [line items]      
Carrying Amount $ 21,762.2 $ 18,730.2 $ 784.5
Vanguard International Semiconductor Corporation [member]      
Disclosure of associates [line items]      
Principal Activities Manufacturing, sales, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks Manufacturing, sales, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks  
Place of Incorporation and Operation Hsinchu, Taiwan Hsinchu, Taiwan  
Carrying Amount $ 10,469.2 $ 8,964.1  
% of Ownership and Voting Rights Held by the Company 28.00% 28.00%  
Systems on Silicon Manufacturing Company Pte Ltd. [member]      
Disclosure of associates [line items]      
Principal Activities Manufacturing and sales of integrated circuits and other semiconductor devices Manufacturing and sales of integrated circuits and other semiconductor devices  
Place of Incorporation and Operation Singapore Singapore  
Carrying Amount $ 6,795.7 $ 5,900.2  
% of Ownership and Voting Rights Held by the Company 39.00% 39.00%  
Xintec Inc. [member]      
Disclosure of associates [line items]      
Principal Activities Wafer level chip size packaging and wafer level post passivation interconnection service Wafer level chip size packaging and wafer level post passivation interconnection service  
Place of Incorporation and Operation Taoyuan, Taiwan Taoyuan, Taiwan  
Carrying Amount $ 3,012.3 $ 2,522.3  
% of Ownership and Voting Rights Held by the Company 41.00% 41.00%  
Global Unichip Corporation [member]      
Disclosure of associates [line items]      
Principal Activities Researching, developing, manufacturing, testing and marketing of integrated circuits Researching, developing, manufacturing, testing and marketing of integrated circuits  
Place of Incorporation and Operation Hsinchu, Taiwan Hsinchu, Taiwan  
Carrying Amount $ 1,462.1 $ 1,315.4  
% of Ownership and Voting Rights Held by the Company 35.00% 35.00%  
Mutual-Pak [member]      
Disclosure of associates [line items]      
Principal Activities Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID  
Place of Incorporation and Operation New Taipei, Taiwan New Taipei, Taiwan  
Carrying Amount $ 22.9 $ 28.2  
% of Ownership and Voting Rights Held by the Company 28.00% 28.00%