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Notes and Accounts Receivable, Net - Aging Analysis of Notes and Accounts Receivable, Net (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Disclosure of financial assets [line items]      
Notes and accounts receivable, net $ 128,613.4 $ 4,201.7 $ 121,133.2
Past due over 121 days [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net     341.4
Neither past due nor impaired [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net     105,295.2
Past due but not impaired [member] | Past due within 30 days [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net     13,984.1
Past due but not impaired [member] | Past due 31-60 days [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net     929.7
Past due but not impaired [member] | Past due 61-120 days [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net     $ 582.8
Financial assets not past due [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net 113,126.5    
Past due [member] | Past due within 30 days [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net 15,006.5    
Past due [member] | Past due 31-60 days [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net 472.8    
Past due [member] | Past due 61-120 days [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net 4.6    
Past due [member] | Past due over 121 days [member]      
Disclosure of financial assets [line items]      
Notes and accounts receivable, net $ 3.0