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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Financial Assets [Line Items]      
Beginning balance $ 1,365    
Add: Provision for credit loss 128 $ 109 $ 123
Ending balance 1,102 1,365  
Trade notes and accounts receivable [Member]      
Disclosure Of Financial Assets [Line Items]      
Beginning balance 1,365 1,605  
Add: Provision for credit loss 128 109  
Less: Amounts written off (391) (349)  
Ending balance $ 1,102 $ 1,365 $ 1,605