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Income Tax - Major Components of Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Current tax        
Current tax expenses recognized for the year $ 8,172   $ 8,109 $ 8,271
Income tax on unappropriated earnings 8   (20) (2,070)
Income tax adjustments on prior years (22)   (91) 7
Others 19   12 8
Current tax 8,177   8,010 6,216
Deferred tax        
Deferred tax expense (benefits) recognized for the year (81)   (63) 208
Income tax adjustments on prior years 26   (1) 19
Change in tax rate 0   0 (38)
Deferred tax (55)   (64) 189
Income tax expense recognized in profit or loss $ 8,122 $ 289 $ 7,946 $ 6,405