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