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Net Income - Depreciation and Amortization Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure Of Depreciation And Amortization [Line Items]        
Property, plant and equipment $ 26,989   $ 26,930 $ 27,461
Right-of-use assets 3,931   3,968 0
Investment properties 22   25 21
Intangible assets 5,424   4,253 4,386
Incremental costs of obtaining contracts 772 $ 27 1,173 1,941
Total depreciation and amortization expenses 37,138   36,349 33,809
Depreciation expenses 30,942 $ 1,102 30,923 27,482
Amortization expenses 6,196   5,426 6,327
Operating costs [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 29,056   28,957 25,996
Amortization expenses 5,971   5,196 6,085
Operating expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 1,886   1,966 1,486
Marketing expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 100   96 113
General and administrative expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 82   95 93
Research and development expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses $ 43   $ 39 $ 36