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Income Tax - Summary 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 income tax expense        
Current tax expense recognized in the current year $ 73,851.4   $ 72,405.0 $ 61,297.7
Income tax adjustments on prior years (19,107.0)   (16,628.1) (12,661.2)
Other income tax adjustments 152.8   122.5 247.8
Current income tax expense 54,897.2   55,899.4 48,884.3
Deferred income tax expense (benefit)        
Effect of tax rate changes 561.8      
The origination and reversal of temporary differences (4,336.1)   (1,775.0) (1,542.8)
Investment tax credits and operating loss carryforward       303.2
Deferred income tax expense (benefit) (3,774.3)   (1,775.0) (1,239.6)
Income tax expense recognized in profit or loss $ 51,122.9 $ 1,724.8 $ 54,124.4 $ 47,644.7