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Additional Information of Expenses by Nature - Summary of Additional Information of Expenses by Nature (Detail)
$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
TWD ($)
Expense by nature [line items]      
Other operating income and expenses $ (135.6) $ (4.9) $ 59.6
Depreciation of property, plant and equipment and right-of-use assets 200,697.1 7,190.9 136,065.3
Amortization of intangible assets 4,008.4 $ 143.6 3,364.4
Post-employment benefits 1,810.0   1,441.8
Depreciation of property, plant and equipment and right-of-use assets [members]      
Expense by nature [line items]      
Cost of revenue 186,947.1   123,444.4
Operating expenses 13,615.9   12,609.5
Other operating income and expenses 134.1   11.4
Amortization of intangible assets [members]      
Expense by nature [line items]      
Cost of revenue 2,681.9   2,175.0
Operating expenses 1,326.5   1,189.4
Employee benefits expenses [members]      
Expense by nature [line items]      
Cost of revenue 46,320.2   39,481.5
Operating expenses 31,171.9   26,960.8
Defined contribution plans 1,713.8   1,339.3
Defined benefit plans 96.2   102.5
Other employee benefits 75,682.1   65,000.5
Employee benefits expenses $ 77,492.1   $ 66,442.3