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Income Tax - Summary of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Current income tax expense        
Current tax expense recognized in the current year $ 190,022.2   $ 107,694.4 $ 87,452.7
Income tax adjustments on prior years (19,413.0)   (14,539.5) (7,589.4)
Other income tax adjustments 206.1   152.2 150.2
Current income tax expense 170,815.3   93,307.1 80,013.5
Deferred income tax benefit        
The origination and reversal of temporary differences (24,714.5)   (17,530.0) (6,275.2)
Investment tax credits 4,676.7   (5,621.7)  
Deferred income tax benefit (20,037.8)   (23,151.7) (6,275.2)
Income tax expense recognized in profit or loss $ 150,777.5 $ 4,906.5 $ 70,155.4 $ 73,738.3