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Net Income - Depreciation and Amortization 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 Depreciation And Amortization [Line Items]        
Property, plant and equipment $ 27,805   $ 26,989 $ 26,930
Right-of-use assets 3,985   3,931 3,968
Investment properties 42   22 25
Intangible assets 6,569   5,424 4,253
Incremental costs of obtaining contracts 815 $ 29 772 1,173
Total depreciation and amortization expenses 39,216   37,138 36,349
Depreciation expenses 31,832 $ 1,148 30,942 30,923
Amortization expenses 7,384   6,196 5,426
Operating costs [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 30,021   29,056 28,957
Amortization expenses 7,172   5,971 5,196
Operating expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 1,811   1,886 1,966
Marketing expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 93   100 96
General and administrative expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 75   82 95
Research and development expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses $ 44   $ 43 $ 39