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Income Tax - Reconciliation of Accounting Profit and Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Income before income tax $ 47,008 $ 1,535 $ 47,204 $ 46,067
Income tax expense calculated at the statutory rate 9,401   9,441 9,213
Nondeductible income and expenses in determining taxable income 28   (20) 8
Tax-exempt income (9)   (3) (30)
Income tax on unappropriated earnings (31)   137 181
Investment credits (209)   (207) (217)
Effect of different tax rates of group entities operating in other jurisdictions (7)   (31) (10)
Income tax adjustments on prior years (119)   10 (147)
Others (107)   8 22
Income tax recognized in profit or loss $ 8,947 $ 292 $ 9,335 $ 9,020