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Net Income and Other Comprehensive Income (Loss) - Employee Benefit Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Post-employment benefit        
Defined contribution plans $ 594   $ 544 $ 489
Defined benefit plans pension costs recognized in profit and loss 2,834   2,822 2,914
Post-employment benefit 3,428   3,366 3,403
Share-based payment        
Compensation cost of share-based payment transactions 22 $ 1 17 36
Other employee benefit        
Salaries 25,760   25,985 25,526
Insurance 2,748   2,652 2,643
Others 15,449   15,730 15,717
Other employee benefit 43,957   44,367 43,886
Employee benefit expenses 47,407   47,750 47,325
Summary by functions        
Compensation distributed to the employees     1,702 1,928
Remuneration paid to the directors     42 45
Operating costs [Member]        
Post-employment benefit        
Defined benefit plans pension costs recognized in profit and loss 1,734   1,732 1,794
Other employee benefit        
Employee benefit expenses 24,725   25,190 25,320
Operating Expenses        
Other employee benefit        
Employee benefit expenses $ 22,682   $ 22,560 $ 22,005