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Trade Notes and Accounts Receivable, Net - Movements of Allowance for Doubtful Accounts, Trade Notes and Accounts Receivable (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Financial Assets [Line Items]      
Beginning balance $ (1,102)    
Add: Provision for credit loss 179 $ 128 $ 109
Ending balance (1,143) (1,102)  
Trade notes and accounts receivable [Member]      
Disclosure Of Financial Assets [Line Items]      
Beginning balance 1,102 1,365  
Add: Provision for credit loss 179 128  
Less: Amounts written off (138) (391)  
Ending balance $ 1,143 $ 1,102 $ 1,365