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Income Tax - Major Components of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Current tax        
Current tax expenses recognized for the year $ 8,490   $ 8,172 $ 8,109
Income tax on unappropriated earnings 181   8 (20)
Income tax adjustments on prior years (150)   (22) (91)
Others 7   19 12
Current tax 8,528   8,177 8,010
Deferred tax        
Deferred tax expense (benefits) recognized for the year 489   (81) (63)
Income tax adjustments on prior years 3   26 (1)
Deferred tax 492   (55) (64)
Income tax expense recognized in profit or loss $ 9,020 $ 325 $ 8,122 $ 7,946