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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, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Expense by nature [line items]        
Depreciation of property, plant and equipment $ 288,124.9 $ 9,412.8 $ 255,796.0 $ 220,085.0
Amortization of intangible assets 4,421.4 144.5 4,346.7 3,743.4
Research and development costs expensed as incurred 85,895.6 $ 2,806.1 80,732.5 71,207.7
Defined contribution plans 2,568.9   2,369.9 2,164.9
Defined benefit plans 281.8   271.5 272.2
Post-employment benefits 2,850.7   2,641.4 2,437.1
Other employee benefits 105,364.2   101,488.7 97,248.0
Employee benefits expenses 108,214.9   104,130.1 99,685.1
Cost of revenue [member]        
Expense by nature [line items]        
Depreciation of property, plant and equipment 264,804.7   235,985.2 203,476.8
Amortization of intangible assets 2,073.5   2,135.5 2,028.5
Employee benefits expenses 63,597.7   61,026.1 58,493.5
Operating expenses [member]        
Expense by nature [line items]        
Depreciation of property, plant and equipment 23,292.3   19,746.3 16,583.1
Amortization of intangible assets 2,347.9   2,211.2 1,714.9
Employee benefits expenses 44,617.2   43,104.0 41,191.6
Other operating income and expenses [member]        
Expense by nature [line items]        
Depreciation of property, plant and equipment $ 27.9   $ 64.5 $ 25.1