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Income Tax - Reconciliation of Accounting Profit and Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Income before income tax $ 47,841 $ 1,459 $ 47,008 $ 47,204
Income tax expense calculated at the statutory rate 9,568   9,401 9,441
Nondeductible income and expenses in determining taxable income 25   28 (20)
Tax-exempt income (29)   (9) (3)
Income tax on unappropriated earnings 122   (31) 137
Investment credits (218)   (209) (207)
Effect of different tax rates of group entities operating in other jurisdictions 10   (7) (31)
Income tax adjustments on prior years (168)   (119) 10
Others 23   (107) 8
Income tax recognized in profit or loss $ 9,333 $ 285 $ 8,947 $ 9,335