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Income Tax - Summary of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Current income tax expense        
Current tax expense recognized in the current year $ 60,584.3   $ 73,851.4 $ 72,405.0
Income tax adjustments on prior years (21,753.0)   (19,107.0) (16,628.1)
Other income tax adjustments 152.9   152.8 122.5
Current income tax expense 38,984.2   54,897.2 55,899.4
Deferred income tax expense (benefit)        
Effect of tax rate changes (1,474.8)   561.8  
The origination and reversal of temporary differences (3,072.5)   (4,336.1) (1,775.0)
Deferred income tax expense (benefit) (4,547.3)   (3,774.3) (1,775.0)
Income tax expense recognized in profit or loss $ 34,436.9 $ 1,125.1 $ 51,122.9 $ 54,124.4