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Notes and Accounts Receivable, Net - Summary of Notes and Accounts Receivable, Net (Detail)
$ in Millions, $ in Millions
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of information about of trade accounts and notes receivables [line items]          
Notes and accounts receivable $ 270,683.2 $ 8,255.1 $ 201,313.9    
Less: Loss allowance (453.0)   (531.5) $ (331.6) $ (347.0)
Trade receivables [member]          
Disclosure of information about of trade accounts and notes receivables [line items]          
Notes and accounts receivable 264,770.7   195,902.6    
Trade receivables [member] | Amortized cost [member]          
Disclosure of information about of trade accounts and notes receivables [line items]          
Notes and accounts receivable 265,223.7   196,434.1    
Less: Loss allowance (453.0)   (531.5)    
Trade receivables [member] | FVTOCI [member]          
Disclosure of information about of trade accounts and notes receivables [line items]          
Notes and accounts receivable $ 5,912.5   $ 5,411.3