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Application Of New And Revised International Financial Reporting Standards (Ifrs), International Accounting Standards (Ias), Ifric Interpretations (Ifric), And Sic Interpretations (Sic) Issued By The International Accounting Standards Board (Iasb) (Collectively, "Ifrss") - Summary of Impact on Assets, Liabilities and Equity under IFRS 16 (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Jan. 01, 2019
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Disclosure of initial application of standards or interpretations [line items]        
Other current assets $ 5,406.4      
Other noncurrent assets 1,584.6   $ 51.8 $ 2,983.1
Accrued expenses and other current liabilities 61,760.6   2,017.7 65,588.4
Other noncurrent liabilities 1,951.0   $ 63.7 $ 1,855.6
IFRS 16 [member]        
Disclosure of initial application of standards or interpretations [line items]        
Other current assets   $ 5,288.2    
Right-of-use assets   20,082.9    
Other noncurrent assets   1,507.4    
Accrued expenses and other current liabilities   64,388.0    
Lease liabilities - noncurrent   17,269.3    
Other noncurrent liabilities   $ 1,941.8    
Adjustments arising from initial application [member] | IFRS 16 [member]        
Disclosure of initial application of standards or interpretations [line items]        
Other current assets (118.2)      
Right-of-use assets 20,082.9      
Other noncurrent assets (77.2)      
Total effect on assets 19,887.5      
Accrued expenses and other current liabilities 2,627.4      
Lease liabilities - noncurrent 17,269.3      
Other noncurrent liabilities (9.2)      
Total effect on liabilities 19,887.5      
Total effect on equity $ 0.0