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Net Income and Other Comprehensive Income (Loss) - Employee Benefit Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined contribution plans $ 654   $ 640 $ 594
Defined benefit plans pension costs recognized in profit and loss 2,859   2,953 2,834
Post-employment benefit 3,513   3,593 3,428
Compensation cost of share-based payment transactions 2 $ 0 17 22
Salaries 25,464   26,204 25,760
Insurance 2,746   2,740 2,748
Others 14,430   14,470 15,449
Other employee benefit 42,640   43,414 43,957
Employee benefit expenses 46,155   47,024 47,407
Summary by functions        
Compensation distributed to the employees     1,404 1,596
Remuneration paid to the directors     38 41
Operating costs [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined benefit plans pension costs recognized in profit and loss 1,726   1,796 1,734
Employee benefit expenses 23,587   24,367 24,725
Operating expenses [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Employee benefit expenses $ 22,568   $ 22,657 $ 22,682