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Income Tax - Major Components of Income Tax Expense (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Current tax |  |  |  |
Current tax expenses recognized for the year | $ 8,109 |  | $ 8,271 | $ 7,996
Income tax on unappropriated earnings | (20) |  | (2,070) | (60)
Income tax adjustments on prior years | (91) |  | 7 | (2)
Others | 12 |  | 8 | 10
Current tax | 8,010 |  | 6,216 | 7,944
Deferred tax |  |  |  |
Deferred tax expense recognized for the year | (63) |  | 208 | (101)
Income tax adjustments on prior years | (1) |  | 19 | 6
Change in tax rate | 0 |  | (38) | 0
Deferred tax | (64) |  | 189 | (95)
Income tax expense recognized in profit or loss | $ 7,946 | $ 266 | $ 6,405 | $ 7,849

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