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Application of New and Amended International Financial Reporting Standards - Schedule of Increase (Decrease) in Net Income Resulting from the Application of IFRS 15 (Detail)
$ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
TWD ($)
$ / shares
Dec. 31, 2016
TWD ($)
$ / shares
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Revenues $ 215,483 $ 7,040 $ 227,514 $ 229,991
Operating costs 139,545 4,559 146,837 147,552
Operating expenses 32,404 1,059 33,869 33,838
Income from operations 43,644 1,426 46,703 48,105
INCOME TAX EXPENSE 6,405 210 7,849 7,787
Net income 38,581 1,260 40,160 41,626
Decrease in net income attributable to:        
Stockholders of the parent 37,557 1,227 38,988 40,485
Noncontrolling interests 1,024 33 1,172 1,141
NET INCOME $ 38,581 $ 1,260 $ 40,160 $ 41,626
EARNINGS PER SHARE        
Basic | (per share) $ 4.84 $ 0.16 $ 5.03 $ 5.22
Diluted | (per share) $ 4.83 $ 0.16 $ 5.02 $ 5.21
IFRS 15 [Member] | Increase (Decrease) Due to Application of IFRS 15 [Member]        
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Revenues $ (3,228)      
Operating costs 2,455      
Operating expenses (1,293)      
Income from operations (4,390)      
INCOME TAX EXPENSE (808)      
Net income (3,582)      
Decrease in net income attributable to:        
Stockholders of the parent (3,582)      
NET INCOME $ (3,582)      
EARNINGS PER SHARE        
Basic | $ / shares $ (0.46)      
Diluted | $ / shares $ (0.46)