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Income Tax - Summary of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
TWD ($)
Current income tax expense      
Current tax expense recognized in the current period $ 49,846.5   $ 41,421.1
Income tax adjustments on prior years (12,748.5)   (7,553.0)
Other income tax adjustments 69.9   (79.5)
Current income tax expense 37,167.9   33,788.6
Deferred income tax benefit      
The origination and reversal of temporary differences (7,238.3)   (2,580.5)
Investment tax credits (2,632.6)    
Deferred income tax benefit (9,870.9)   (2,580.5)
Income tax expense recognized in profit or loss $ 27,297.0 $ 978.0 $ 31,208.1