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Net Income - Employee Benefit Expenses (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined contribution plans $ 784   $ 708 $ 654
Defined benefit plans pension costs recognized in profit and loss 1,216   2,001 2,859
Post-employment benefit 2,000   2,709 3,513
Compensation cost of share-based payment transactions 19 $ 0 8 2
Other employee benefit 42,654   42,246 42,640
Employee benefit expenses 44,673   44,963 46,155
Summary by functions        
Compensation distributed to the employees     1,202 1,126
Remuneration paid to the directors     36 35
Operating costs [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Defined benefit plans pension costs recognized in profit and loss 725   1,205 1,726
Employee benefit expenses 22,734   23,005 23,587
Operating expenses [Member]        
Disclosure Of Employee Benefit Expenses [Line Items]        
Employee benefit expenses $ 21,939   $ 21,958 $ 22,568