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Notes and Accounts Receivable, Net - Summary of Notes and Accounts Receivable, Net (Detail)
$ in Millions, $ in Millions
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of information about of trade accounts and notes receivables [line items]          
Notes and accounts receivable $ 229,755.9 $ 7,476.6 $ 197,586.1    
Less: Loss allowance (331.6)   (347.0) $ (246.6) $ (325.3)
Trade receivables [member]          
Disclosure of information about of trade accounts and notes receivables [line items]          
Notes and accounts receivable 222,430.3   193,386.2    
Trade receivables [member] | Amortized cost [member]          
Disclosure of information about of trade accounts and notes receivables [line items]          
Notes and accounts receivable 222,761.9   193,733.2    
Less: Loss allowance (331.6)   (347.0)    
Trade receivables [member] | FVTOCI [member]          
Disclosure of information about of trade accounts and notes receivables [line items]          
Notes and accounts receivable $ 7,325.6   $ 4,199.9