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Application of New and Amended International Financial Reporting Standards - Schedule of Anticipated Significant Impact on Assets, Liabilities and Equity When Retrospectively Applying IRFS 15 (Detail)
$ in Millions, $ in Millions
Jan. 01, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Contract assets - current $ 6,998 $ 0    
Contract assets - noncurrent 3,917 0    
Incremental costs to obtain a contract 2,467 0    
Contract liability - current 197 0    
Contract liability - noncurrent 86 0    
Current tax liabilities 10,901 8,674 $ 293 $ 6,522
Total effect on equity (unappropriated earnings) 65,505 $ 54,633    
Increase (decrease) due to application of IFRS 15 [member]        
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Contract assets - current 6,998      
Contract assets - noncurrent 3,917      
Incremental costs to obtain a contract 2,467      
Total effect on assets 13,382      
Contract liability - current 197      
Contract liability - noncurrent 86      
Current tax liabilities 2,227      
Total effect on liabilities 2,510      
Total effect on equity (unappropriated earnings) $ 10,872