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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Expense by nature [line items]        
Other operating income and expenses $ (333.4) $ (12.0) $ 710.0 $ (496.3)
Defined contribution plans 3,711.0   2,809.5 2,609.7
Defined benefit plans 192.5   204.9 259.6
Depreciation of property, plant and equipment and right-of-use assets 414,187.7 14,931.1 324,538.4 281,411.8
Amortization of intangible assets 8,207.2 $ 295.9 7,186.2 5,472.4
Post-employment benefits 3,903.5   3,014.4 2,869.3
Depreciation of property, plant and equipment and right-of-use assets [members]        
Expense by nature [line items]        
Cost of revenue 386,103.9   299,311.4 256,530.9
Operating expenses 27,936.2   25,191.3 24,856.7
Other operating income and expenses 147.6   35.7 24.2
Amortization of intangible assets [members]        
Expense by nature [line items]        
Cost of revenue 5,574.3   4,837.7 3,069.9
Operating expenses 2,632.9   2,348.5 2,402.5
Employee benefits expenses [members]        
Expense by nature [line items]        
Cost of revenue 98,012.8   83,099.0 64,702.0
Operating expenses 66,934.3   57,718.4 45,282.6
Defined contribution plans 3,711.0   2,809.5 2,609.7
Defined benefit plans 192.5   204.9 259.6
Other employee benefits 161,043.6   137,803.0 107,115.3
Employee benefits expenses $ 164,947.1   $ 140,817.4 $ 109,984.6