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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, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Current income tax expense |  |  |  |
Current tax expense recognized in the current year | $ 275,726.3 |  | $ 156,684.0 | $ 190,022.2
Income tax adjustments for prior years | (29,968.0) |  | (32,775.5) | (19,413.0)
Other income tax adjustments | 371.4 |  | 244.3 | 206.1
Current income tax expense | 246,129.7 |  | 124,152.8 | 170,815.3
Deferred income tax |  |  |  |
The origination and reversal of temporary differences | 916.0 |  | 4,136.0 | (20,037.8)
Income tax adjustments for prior years | 3,925.3 |  |  |
Operating loss carryforward | (2,654.9) |  |  |
Deferred income tax benefit | 2,186.4 |  | 4,136.0 | (20,037.8)
Income tax expense recognized in profit or loss | $ 248,316.1 | $ 7,572.9 | $ 128,288.8 | $ 150,777.5

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