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Net Income - Employee Benefit 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 Employee Benefit Expenses [Line Items]        
Defined contribution plans $ 963   $ 862 $ 784
Defined benefit plans pension costs recognized in profit and loss 935   1,048 1,216
Post-employment benefit 1,898   1,910 2,000
Compensation cost of share-based payment transactions 8 $ 0 16 19
Other employee benefit (Note) 44,305   43,746 42,654
Employee benefit expenses 46,211   45,672 44,673
Summary by functions        
Compensation distributed to the employees     1,498 1,429
Remuneration paid to the directors     39 39
Operating costs [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined benefit plans pension costs recognized in profit and loss 488   565 725
Employee benefit expenses 21,858   21,857 22,734
Operating expenses [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Employee benefit expenses $ 24,353   $ 23,815 $ 21,939