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Income Tax - Major Components of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Current tax        
Current tax expenses recognized for the year $ 9,199   $ 8,875 $ 8,863
Income tax on unappropriated earnings 122   (31) 137
Income tax adjustments on prior years (176)   (128) (141)
Others 4   4 7
Current tax 9,149   8,720 8,866
Deferred tax        
Deferred tax expense recognized for the year 176   218 318
Income tax adjustments on prior years 8   9 151
Deferred tax 184   227 469
Income tax recognized in profit or loss $ 9,333 $ 285 $ 8,947 $ 9,335