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Net Income and Other Comprehensive Income (Loss) - Depreciation and Amortization 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 Depreciation And Amortization [Line Items]        
Property, plant and equipment $ 27,461   $ 28,143 $ 29,087
Investment properties 21   21 19
Intangible assets 4,386   3,766 3,379
Amortization of incremental costs of obtaining contracts 1,941 $ 63 0 0
Total depreciation and amortization expenses 33,809   31,930 32,485
Depreciation expenses 27,482 $ 898 28,164 29,106
Amortization expenses 6,327   3,766 3,379
Operating costs [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 25,996   26,402 27,214
Amortization expenses 6,085   3,473 3,042
Operating expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Depreciation expenses 1,486   1,762 1,892
Marketing expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 113   154 173
General and administrative expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses 93   104 126
Research and development expenses [Member]        
Disclosure Of Depreciation And Amortization [Line Items]        
Amortization expenses $ 36   $ 35 $ 38