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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Expense by nature [line items]        
Other operating income and expenses $ (368.4) $ (12.0) $ (333.4) $ 710.0
Defined contribution plans 4,550.4   3,711.0 2,809.5
Defined benefit plans 208.6   192.5 204.9
Share -based payments 335.1   7.8 6.6
Depreciation of property, plant and equipment and right-of-use assets 428,498.2 13,944.0 414,187.7 324,538.4
Amortization of intangible assets 8,756.1 $ 284.9 8,207.2 7,186.2
Post-employment benefits 4,759.0   3,903.5 3,014.4
Depreciation of property, plant and equipment and right-of-use assets [member]        
Expense by nature [line items]        
Cost of revenue 399,638.8   386,103.9 299,311.4
Operating expenses 28,850.5   27,936.2 25,191.3
Other operating income and expenses 8.9   147.6 35.7
Amortization of intangible assets [member]        
Expense by nature [line items]        
Cost of revenue 6,086.3   5,574.3 4,837.7
Operating expenses 2,669.8   2,632.9 2,348.5
Employee benefits expenses [member]        
Expense by nature [line items]        
Cost of revenue 139,361.4   98,012.8 83,099.0
Operating expenses 100,100.6   66,934.3 57,718.4
Defined contribution plans 4,550.4   3,711.0 2,809.5
Defined benefit plans 208.6   192.5 204.9
Equity-settled 302.4   7.8 6.6
Cash-settled 32.7   0.0 0.0
Other employee benefits 234,367.9   161,035.8 137,796.4
Employee benefits expenses $ 239,462.0   $ 164,947.1 $ 140,817.4