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Lease Arrangements - Right-of-use Assets (Detail) - 12 months ended Dec. 31, 2019
$ in Millions, $ in Millions
TWD ($)
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets $ 17,232.4 $ 576.1
Additions to right-of-use assets 1,033.0  
Depreciation of right-of-use assets 2,622.7  
Income from subleasing right-of-use assets 55.0  
Land [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 14,064.0  
Depreciation of right-of-use assets 957.1  
Buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 2,351.8  
Depreciation of right-of-use assets 458.8  
Machinery and equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 775.8  
Depreciation of right-of-use assets 1,184.4  
Office equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets 40.8  
Depreciation of right-of-use assets $ 22.4