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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, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of depreciation and amortization [Line Items]        
Property, plant and equipment $ 28,143   $ 29,087 $ 30,350
Investment properties 21   19 18
Intangible assets 3,766   3,379 3,080
Total depreciation and amortization expenses 31,930   32,485 33,448
Depreciation expenses 28,164 $ 950 29,106 30,368
Amortization expenses 3,766 $ 127 3,379 3,080
Operating costs [Member]        
Disclosure of depreciation and amortization [Line Items]        
Depreciation expenses 26,402   27,214 28,292
Amortization expenses 3,473   3,042 2,742
Operating expenses [Member]        
Disclosure of depreciation and amortization [Line Items]        
Depreciation expenses 1,762   1,892 2,076
Marketing expenses [Member]        
Disclosure of depreciation and amortization [Line Items]        
Amortization expenses 154   173 178
General and administrative expenses [Member]        
Disclosure of depreciation and amortization [Line Items]        
Amortization expenses 104   126 116
Research and development expenses [Member]        
Disclosure of depreciation and amortization [Line Items]        
Amortization expenses $ 35   $ 38 $ 44