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Net Income - Depreciation and Amortization Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure Of Depreciation And Amortization [Line Items]        
Property, plant and equipment $ 28,760   $ 27,805 $ 26,989
Right-of-use assets 3,982   3,985 3,931
Investment properties 44   42 22
Intangible assets 6,643   6,569 5,424
Incremental costs of obtaining contracts 841 $ 27 815 772
Total depreciation and amortization expenses 40,270   39,216 37,138
Depreciation expenses 32,786 $ 1,067 31,832 30,942
Amortization expenses 7,484   7,384 6,196
Operating costs [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 30,735   30,021 29,056
Amortization expenses 7,286   7,172 5,971
Operating expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 2,051   1,811 1,886
Marketing expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 77   93 100
General and administrative expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 71   75 82
Research and development expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses $ 50   $ 44 $ 43