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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, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Expense by nature [line items]        
Other operating income and expenses $ (496.3) $ (16.6) $ (2,101.5) $ (1,365.5)
Defined contribution plans 2,609.7   2,568.9 2,369.9
Defined benefit plans 259.6   281.8 271.5
Depreciation of property, plant and equipment 281,411.8 9,408.6 288,124.9 255,796.0
Amortization of intangible assets 5,472.4 183.0 4,421.4 4,346.7
Research and development costs expensed as incurred 91,418.7 $ 3,056.5 85,895.6 80,732.5
Post-employment benefits 2,869.3   2,850.7 2,641.4
Depreciation of property, plant and equipment and right-of-use assets [members]        
Expense by nature [line items]        
Cost of revenue 256,530.9   264,804.7 235,985.2
Operating expenses 24,856.7   23,292.3 19,746.3
Other operating income and expenses 24.2   27.9 64.5
Amortization of intangible assets [members]        
Expense by nature [line items]        
Cost of revenue 3,069.9   2,073.5 2,135.5
Operating expenses 2,402.5   2,347.9 2,211.2
Employee benefits expenses [members]        
Expense by nature [line items]        
Cost of revenue 64,702.0   63,597.7 61,026.1
Operating expenses 45,282.6   44,617.2 43,104.0
Defined contribution plans 2,609.7   2,568.9 2,369.9
Defined benefit plans 259.6   281.8 271.5
Other employee benefits 107,115.3   105,364.2 101,488.7
Employee benefits expenses $ 109,984.6   $ 108,214.9 $ 104,130.1