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Additional Information of Expenses by Nature - Summary of Additional Information of Expenses by Nature (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Expense by nature [line items]        
Other operating income and expenses $ (1,230.2) $ (37.5) $ 188.7 $ (368.4)
Depreciation of property, plant and equipment and right-of-use assets 653,610.5 19,933.2 522,932.7 428,498.2
Defined contribution plans 5,932.2   5,365.5 4,550.4
Defined benefit plans 275.7   281.4 208.6
Share -based payments 1,646.2   544.4 335.1
Amortization of intangible assets 9,186.1 $ 280.2 9,258.2 8,756.1
Post-employment benefits 6,207.9   5,646.9 4,759.0
Depreciation of property, plant and equipment and right-of-use assets [member]        
Expense by nature [line items]        
Cost of revenue 616,390.4   492,827.4 399,638.8
Operating expenses 37,190.4   30,097.8 28,850.5
Other operating income and expenses 29.7   7.5 8.9
Amortization of intangible assets [member]        
Expense by nature [line items]        
Cost of revenue 6,342.3   6,538.1 6,086.3
Operating expenses 2,843.8   2,720.1 2,669.8
Employee benefits expenses [member]        
Expense by nature [line items]        
Cost of revenue 163,657.1   133,334.7 139,361.4
Operating expenses 138,165.0   106,373.9 100,100.6
Defined contribution plans 5,932.2   5,365.5 4,550.4
Defined benefit plans 275.7   281.4 208.6
Equity-settled 1,242.7   483.0 302.4
Cash-settled 403.5   61.4 32.7
Other employee benefits 293,968.0   233,517.3 234,367.9
Employee benefits expenses $ 301,822.1   $ 239,708.6 $ 239,462.0