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Notes and Accounts Receivable, Net - Aging Analysis of Notes and Accounts Receivable, Net (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of financial assets [line items]        
Notes and accounts receivable, net $ 145,480.3 $ 5,180.9 $ 138,908.6  
Less: Loss allowance (246.6)   (325.3) $ (7.3)
Allowance for credit losses [member]        
Disclosure of financial assets [line items]        
Less: Loss allowance (246.6)   (325.3)  
Not past due [member]        
Disclosure of financial assets [line items]        
Notes and accounts receivable, net 140,933.6   126,134.8  
Past due [member] | Past due within 30 days [member]        
Disclosure of financial assets [line items]        
Notes and accounts receivable, net 4,784.4   13,082.1  
Past due [member] | Past due 31-60 days [member]        
Disclosure of financial assets [line items]        
Notes and accounts receivable, net 8.7   12.8  
Past due [member] | Past due 61-120 days [member]        
Disclosure of financial assets [line items]        
Notes and accounts receivable, net 0.1   1.0  
Past due [member] | Past due over 121 days [member]        
Disclosure of financial assets [line items]        
Notes and accounts receivable, net $ 0.1   $ 3.2