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Related Party Transactions - Summary of Significant Transactions between the Company and Other Related Parties (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
USD ($)
Disclosure of transactions between related parties [line items]        
Net revenue from sale of goods $ 6,253.9 $ 8,980.4 $ 8,496.1  
Receivables from related parties 862.1 584.4   $ 28.8
Payables to related parties 1,434.9 1,376.5    
Other receivables from related parties 51.6 65.0   $ 1.7
Global Unichip Corporation [member]        
Disclosure of transactions between related parties [line items]        
Receivables from related parties 741.9 481.9    
Xintec Inc. [member]        
Disclosure of transactions between related parties [line items]        
Receivables from related parties 120.2 102.5    
Payables to related parties 736.9 649.8    
Systems on Silicon Manufacturing Company Pte Ltd. [member]        
Disclosure of transactions between related parties [line items]        
Payables to related parties 487.9 362.6    
Other receivables from related parties 46.5 53.8    
Vanguard International Semiconductor Corporation [member]        
Disclosure of transactions between related parties [line items]        
Payables to related parties 154.0 357.1    
Other receivables from related parties 3.9 10.4    
Associates [member]        
Disclosure of transactions between related parties [line items]        
Net revenue from sale of goods 6,253.9 8,980.1 8,496.0  
Net revenue from royalties 183.6 362.3 482.5  
Related Party Categories 6,301.4 8,809.5 9,904.6  
Manufacturing expenses 2,823.0 2,974.6 2,196.1  
Research and development expenses 163.4 83.1 69.8  
Other related parties [member]        
Disclosure of transactions between related parties [line items]        
Net revenue from sale of goods   0.3 0.1  
General and administrative expenses 120.0 120.8 $ 101.5  
Other associates [member]        
Disclosure of transactions between related parties [line items]        
Payables to related parties 56.1 7.0    
Other receivables from related parties $ 1.2 $ 0.8