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Income Tax - Summary 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 income tax expense        
Current tax expense recognized in the current year $ 107,694.4   $ 87,452.7 $ 47,135.5
Income tax adjustments on prior years (14,539.5)   (7,589.4) (10,193.8)
Other income tax adjustments 152.2   150.2 (41.5)
Current income tax expense 93,307.1   80,013.5 36,900.2
Deferred income tax benefit        
The origination and reversal of temporary differences (17,530.0)   (6,275.2) (1,065.1)
Investment tax credits (5,621.7)      
Deferred income tax benefit (23,151.7)   (6,275.2) (1,065.1)
Income tax expense recognized in profit or loss $ 70,155.4 $ 2,529.0 $ 73,738.3 $ 35,835.1