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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, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Expense by nature [line items]        
Other operating income and expenses $ 188.7 $ 6.2 $ (368.4) $ (333.4)
Defined contribution plans 5,365.5   4,550.4 3,711.0
Defined benefit plans 281.4   208.6 192.5
Share -based payments 544.4   335.1 7.8
Depreciation of property, plant and equipment and right-of-use assets 522,932.7 17,078.1 428,498.2 414,187.7
Amortization of intangible assets 9,258.2 $ 302.4 8,756.1 8,207.2
Post-employment benefits 5,646.9   4,759.0 3,903.5
Depreciation of property, plant and equipment and right-of-use assets [member]        
Expense by nature [line items]        
Cost of revenue 492,827.4   399,638.8 386,103.9
Operating expenses 30,097.8   28,850.5 27,936.2
Other operating income and expenses 7.5   8.9 147.6
Amortization of intangible assets [member]        
Expense by nature [line items]        
Cost of revenue 6,538.1   6,086.3 5,574.3
Operating expenses 2,720.1   2,669.8 2,632.9
Employee benefits expenses [member]        
Expense by nature [line items]        
Cost of revenue 133,334.7   139,361.4 98,012.8
Operating expenses 106,373.9   100,100.6 66,934.3
Defined contribution plans 5,365.5   4,550.4 3,711.0
Defined benefit plans 281.4   208.6 192.5
Equity-settled 483.0   302.4 7.8
Cash-settled 61.4   32.7 0.0
Other employee benefits 233,517.3   234,367.9 161,035.8
Employee benefits expenses $ 239,708.6   $ 239,462.0 $ 164,947.1