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Income Tax - Summary of Income Tax Expense (Detail) $ in Millions, $ in Millions | 12 Months Ended
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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

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