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Notes and Accounts Receivable, Net - Aging Analysis of Notes and Accounts Receivable, Net (Detail)
$ in Millions, $ in Millions
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of financial assets [line items]          
Notes and accounts receivable, net $ 138,908.6 $ 4,644.2 $ 128,613.4    
Less: Loss allowance (325.3)   (7.3) $ (471.8) $ (480.1)
Allowance for credit losses [member]          
Disclosure of financial assets [line items]          
Less: Loss allowance (325.3)   (7.3)    
Not past due [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net 126,134.8   113,126.5    
Past due [member] | Past due within 30 days [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net 13,082.1   15,006.5    
Past due [member] | Past due 31-60 days [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net 12.8   472.8    
Past due [member] | Past due 61-120 days [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net 1.0   9.5    
Past due [member] | Past due over 121 days [member]          
Disclosure of financial assets [line items]          
Notes and accounts receivable, net $ 3.2   $ 5.4