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Notes and Accounts Receivable, Net - Aging Analysis of Notes and Accounts Receivable, Net (Detail)
$ in Millions, $ in Millions
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Jun. 30, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of financial assets [line items]          
Notes and accounts receivable, net $ 177,475.5 $ 6,358.9 $ 145,480.3    
Less: Loss allowance (291.1)   (246.6) $ (340.2) $ (325.3)
Allowance for credit losses [member]          
Disclosure of financial assets [line items]          
Less: Loss allowance (291.1)   (246.6)    
Not past due [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net 169,954.9   140,933.6    
Past due [member] | Past due within 30 days [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net 7,811.4   4,784.4    
Past due [member] | Past due 31-60 days [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net 0.2   8.7    
Past due [member] | Past due 61-120 days [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net 0.1   0.1    
Past due [member] | Past due over 121 days [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net $ 0.0   $ 0.1