XML 97 R88.htm IDEA: XBRL DOCUMENT v3.21.2
Lease Arrangements - Right-of-use Assets (Detail)
$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2021
TWD ($)
Jun. 30, 2020
TWD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets $ 32,619.3   $ 1,168.7 $ 27,728.5
Additions to right-of-use assets 6,220.1 $ 5,511.0    
Depreciation of right-of-use assets 1,221.1 1,478.1    
Income from subleasing right-of-use assets (classified under other operating income and expenses, net) 40.7 37.9    
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 30,256.9     25,141.9
Depreciation of right-of-use assets 899.4 605.8    
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 2,323.8     2,544.8
Depreciation of right-of-use assets 310.6 278.2    
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 3.9     0.0
Depreciation of right-of-use assets 0.2 581.9    
Office equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 34.7     $ 41.8
Depreciation of right-of-use assets $ 10.9 $ 12.2