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Income Tax - Major Components of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Current tax        
Current tax expenses recognized for the year $ 8,875   $ 8,863 $ 8,490
Income tax on unappropriated earnings (31)   137 181
Income tax adjustments on prior years (128)   (141) (150)
Others 4   7 7
Current tax 8,720   8,866 8,528
Deferred tax        
Deferred tax expense recognized for the year 218   318 489
Income tax adjustments on prior years 9   151 3
Deferred tax 227   469 492
Income tax recognized in profit or loss $ 8,947 $ 292 $ 9,335 $ 9,020