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Income Tax - Reconciliation of Accounting Profit and Income Tax Expense (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]        
Income before income tax $ 46,067 $ 1,661 $ 42,826 $ 41,867
Income tax expense calculated at the statutory rate 9,213   8,565 8,373
Nondeductible income and expenses in determining taxable income 8   15 18
Unrecognized loss carryforwards (1)   4 7
Tax-exempt income (30)   (367) (148)
Income tax on unappropriated earnings 181   8 (20)
Investment credits (217)   (131) (203)
Effect of different tax rates of group entities operating in other jurisdictions (10)   10 (9)
Income tax adjustments on prior years (147)   4 (92)
Others 23   14 20
Income tax expense recognized in profit or loss $ 9,020 $ 325 $ 8,122 $ 7,946