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Income Tax - Major Components 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 tax        
Current tax expenses recognized for the year $ 8,271   $ 7,996 $ 6,736
Income tax on unappropriated earnings (2,070)   (60) (346)
Income tax adjustments on prior years 7   (2) (22)
Others 8   10 15
Current tax 6,216   7,944 6,383
Deferred tax        
Deferred tax expense recognized for the year 208   (101) 1,404
Income tax adjustments on prior years 19   6 0
Change in tax rate (38)   0 0
Deferred tax 189   (95) 1,404
Income tax expense recognized in profit or loss $ 6,405 $ 210 $ 7,849 $ 7,787