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Net Income - Employee Benefit Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined contribution plans $ 708   $ 654 $ 640
Defined benefit plans pension costs recognized in profit and loss 2,001   2,859 2,953
Post-employment benefit 2,709   3,513 3,593
Compensation cost of share-based payment transactions 8 $ 0 2 17
Salaries 26,630   25,464 26,204
Insurance 2,712   2,746 2,740
Others 12,904   14,430 14,470
Other employee benefit 42,246   42,640 43,414
Employee benefit expenses 44,963   46,155 47,024
Summary by functions        
Compensation distributed to the employees     1,126 1,404
Remuneration paid to the directors     35 38
Operating costs [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined benefit plans pension costs recognized in profit and loss 1,205   1,726 1,796
Employee benefit expenses 23,005   23,587 24,367
Operating expenses [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Employee benefit expenses $ 21,958   $ 22,568 $ 22,657