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Net Income and Other Comprehensive Income (Loss) - Employee Benefit Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined contribution plans $ 640   $ 594 $ 544
Defined benefit plans pension costs recognized in profit and loss 2,953   2,834 2,822
Post-employment benefit 3,593   3,428 3,366
Compensation cost of share-based payment transactions 17 $ 1 22 17
Salaries 26,204   25,760 25,985
Insurance 2,740   2,748 2,652
Others 14,470   15,449 15,730
Other employee benefit 43,414   43,957 44,367
Employee benefit expenses 47,024   47,407 47,750
Summary by functions        
Compensation distributed to the employees     1,596 1,702
Remuneration paid to the directors     41 42
Operating costs [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined benefit plans pension costs recognized in profit and loss 1,796   1,734 1,732
Employee benefit expenses 24,367   24,725 25,190
Operating expenses [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Employee benefit expenses $ 22,657   $ 22,682 $ 22,560