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Net Income - Depreciation and Amortization Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure Of Depreciation And Amortization [Line Items]        
Property, plant and equipment $ 28,707   $ 28,839 $ 28,760
Right-of-use assets 4,168   4,072 3,982
Investment properties 45   45 44
Intangible assets 6,699   6,699 6,643
Incremental costs of obtaining contracts 906 $ 28 856 841
Total depreciation and amortization expenses 40,525   40,511 40,270
Depreciation expenses 32,920 $ 1,004 32,956 32,786
Amortization expenses 7,605   7,555 7,484
Operating costs [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 30,770   30,874 30,735
Amortization expenses 7,406   7,370 7,286
Operating expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 2,150   2,082 2,051
Marketing expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 95   70 77
General and administrative expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 63   68 71
Research and development expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses $ 41   $ 47 $ 50