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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, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Expense by nature [line items]        
Other operating income and expenses $ 710.0 $ 25.3 $ (496.3) $ (2,101.5)
Defined contribution plans 2,809.5   2,609.7 2,568.9
Defined benefit plans 204.9   259.6 281.8
Depreciation of property, plant and equipment and right-of-use assets 324,538.4 11,557.6 281,411.8 288,124.9
Amortization of intangible assets 7,186.2 $ 255.9 5,472.4 4,421.4
Post-employment benefits 3,014.4   2,869.3 2,850.7
Depreciation of property, plant and equipment and right-of-use assets [members]        
Expense by nature [line items]        
Cost of revenue 299,311.4   256,530.9 264,804.7
Operating expenses 25,191.3   24,856.7 23,292.3
Other operating income and expenses 35.7   24.2 27.9
Amortization of intangible assets [members]        
Expense by nature [line items]        
Cost of revenue 4,837.7   3,069.9 2,073.5
Operating expenses 2,348.5   2,402.5 2,347.9
Employee benefits expenses [members]        
Expense by nature [line items]        
Cost of revenue 83,099.0   64,702.0 63,597.7
Operating expenses 57,718.4   45,282.6 44,617.2
Defined contribution plans 2,809.5   2,609.7 2,568.9
Defined benefit plans 204.9   259.6 281.8
Other employee benefits 137,803.0   107,115.3 105,364.2
Employee benefits expenses $ 140,817.4   $ 109,984.6 $ 108,214.9