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Income Tax - Summary of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Current income tax expense        
Current tax expense recognized in the current year $ 87,452.7   $ 47,135.5 $ 60,584.3
Income tax adjustments on prior years (7,589.4)   (10,193.8) (21,753.0)
Other income tax adjustments 150.2   (41.5) 152.9
Current income tax expense 80,013.5   36,900.2 38,984.2
Deferred income tax benefit        
Effect of tax rate changes       (1,474.8)
The origination and reversal of temporary differences (6,275.2)   (1,065.1) (3,072.5)
Deferred income tax benefit (6,275.2)   (1,065.1) (4,547.3)
Income tax expense recognized in profit or loss $ 73,738.3 $ 2,626.0 $ 35,835.1 $ 34,436.9