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Income Tax - Summary of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Current income tax expense        
Current tax expense recognized in the current year $ 47,135.5   $ 60,584.3 $ 73,851.4
Income tax adjustments on prior years (10,193.8)   (21,753.0) (19,107.0)
Other income tax adjustments (41.5)   152.9 152.8
Current income tax expense 36,900.2   38,984.2 54,897.2
Deferred income tax expense (benefit)        
Effect of tax rate changes     (1,474.8) 561.8
The origination and reversal of temporary differences (1,065.1)   (3,072.5) (4,336.1)
Deferred income tax expense (benefit) (1,065.1)   (4,547.3) (3,774.3)
Income tax expense recognized in profit or loss $ 35,835.1 $ 1,198.1 $ 34,436.9 $ 51,122.9