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Income Tax - Reconciliation of Income before Income Tax and Income Tax Expense Recognized in Profit or Loss (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 tax $ 979,316.5   $ 1,144,072.2 $ 663,036.0
Income tax expense at the statutory rate 197,935.7   231,776.1 134,595.2
Tax effect of adjusting items:        
Nondeductible (deductible) items in determining taxable income (7,642.2)   12,309.8 11,279.5
Tax-exempt income 0.0   (157,955.9) (89,852.9)
Additional income tax under the Alternative Minimum Tax Act 0.0   61,578.0 32,852.7
Additional income tax on unappropriated earnings 29,221.8   42,336.8 18,849.5
The origination and reversal of temporary differences 3,210.1   (24,714.5) (17,530.0)
Income tax credits (61,905.4)   4,654.1 (5,651.3)
Tax effect of adjusting items 160,820.0   169,984.4 84,542.7
Income tax adjustments on prior years (32,775.5)   (19,413.0) (14,539.5)
Other income tax adjustments 244.3   206.1 152.2
Income tax expense recognized in profit or loss $ 128,288.8 $ 4,189.7 $ 150,777.5 $ 70,155.4