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Net Income - Employee Benefit 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 Employee Benefit Expenses [Line Items]        
Defined contribution plans $ 1,074   $ 963 $ 862
Defined benefit plans pension costs recognized in profit and loss 835   935 1,048
Post-employment benefit 1,909   1,898 1,910
Compensation cost of share-based payment transactions 8 $ 0 8 16
Other employee benefit (Note) 46,964   44,305 43,746
Employee benefit expenses 48,881   46,211 45,672
Summary by functions        
Compensation distributed to the employees     1,522 1,498
Remuneration paid to the directors     40 39
Operating costs [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined benefit plans pension costs recognized in profit and loss 416   488 565
Employee benefit expenses 22,796   21,858 21,857
Operating expenses [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Employee benefit expenses $ 26,085   $ 24,353 $ 23,815