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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, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Current tax |  |  |  |
Current tax expenses recognized for the year | $ 9,199 |  | $ 8,875 | $ 8,863
Income tax on unappropriated earnings | 122 |  | (31) | 137
Income tax adjustments on prior years | (176) |  | (128) | (141)
Others | 4 |  | 4 | 7
Current tax | 9,149 |  | 8,720 | 8,866
Deferred tax |  |  |  |
Deferred tax expense recognized for the year | 176 |  | 218 | 318
Income tax adjustments on prior years | 8 |  | 9 | 151
Deferred tax | 184 |  | 227 | 469
Income tax recognized in profit or loss | $ 9,333 | $ 285 | $ 8,947 | $ 9,335

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