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Income Tax - Major Components of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Current tax        
Current tax expenses recognized for the year $ 7,996   $ 6,736 $ 8,570
Tax on unappropriated earnings (60)   (346) 821
Income tax adjustments on prior years (2)   (22) (83)
Others 10   15 15
Current tax 7,944   6,383 9,323
Deferred tax        
Deferred tax expense recognized for the year (101)   1,404 (222)
Income tax adjustments on prior years 6   0 0
Deferred tax (95)   1,404 (222)
Income tax expense recognized in profit or loss $ 7,849 $ 265 $ 7,787 $ 9,101