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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, 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 tax $ 663,036.0   $ 584,746.3 $ 389,862.1
Income tax expense at the statutory rate 134,595.2   118,831.3 79,056.5
Tax effect of adjusting items:        
Nondeductible (deductible) items in determining taxable income 11,279.5   1,015.9 (4,183.5)
Tax-exempt income (89,852.9)   (65,988.1) (39,808.1)
Additional income tax under the Alternative Minimum Tax Act 32,852.7   18,872.8 10,367.9
Additional income tax on unappropriated earnings 18,849.5   14,747.3 7,628.1
The origination and reversal of temporary differences (17,530.0)   (6,275.2) (1,065.1)
Income tax credits (5,651.3)   (26.5) (5,925.4)
Tax effect of adjusting items 84,542.7   81,177.5 46,070.4
Income tax adjustments on prior years (14,539.5)   (7,589.4) (10,193.8)
Other income tax adjustments 152.2   150.2 (41.5)
Income tax expense recognized in profit or loss $ 70,155.4 $ 2,529.0 $ 73,738.3 $ 35,835.1