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Net Income - Depreciation and Amortization Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure Of Depreciation And Amortization [Line Items]        
Property, plant and equipment $ 28,839   $ 28,760 $ 27,805
Right-of-use assets 4,072   3,982 3,985
Investment properties 45   44 42
Intangible assets 6,699   6,643 6,569
Incremental costs of obtaining contracts 856 $ 28 841 815
Total depreciation and amortization expenses 40,511   40,270 39,216
Depreciation expenses 32,956 $ 1,076 32,786 31,832
Amortization expenses 7,555   7,484 7,384
Operating costs [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 30,874   30,735 30,021
Amortization expenses 7,370   7,286 7,172
Operating expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 2,082   2,051 1,811
Marketing expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 70   77 93
General and administrative expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 68   71 75
Research and development expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses $ 47   $ 50 $ 44