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Property, Plant and Equipment - Summary of assets subject to operating leases (Detail)
$ in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance $ 1,555,589.1      
Additions 366,978.5   $ 277,237.9  
Ending balance 1,722,679.1 $ 61,722.7   $ 1,555,589.1
Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 1,003.2   63.5 63.5
Ending balance 567.0   38.0 1,003.2
Cost [member] | Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 1,426.6   562.6 562.6
Transfers to assets subject to operating leases (691.7)   (22.3)  
Transfers from assets subject to operating leases 244.6      
Ending balance 979.5   540.3 1,426.6
Accumulated depreciation [member] | Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 423.4   499.1 499.1
Additions 134.1   11.4  
Transfers to assets subject to operating leases (213.3)   (8.2)  
Transfers from assets subject to operating leases 68.3      
Ending balance 412.5   502.3 423.4
Buildings [member] | Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 26.2   63.5 63.5
Ending balance 5.7   38.0 26.2
Buildings [member] | Cost [member] | Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 227.6   562.6 562.6
Transfers to assets subject to operating leases (35.5)   (22.3)  
Ending balance 192.1   540.3 227.6
Buildings [member] | Accumulated depreciation [member] | Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 201.4   499.1 499.1
Additions 0.6   11.4  
Transfers to assets subject to operating leases (15.6)   (8.2)  
Ending balance 186.4   $ 502.3 201.4
Machinery and equipment [member] | Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 977.0      
Ending balance 561.3     977.0
Machinery and equipment [member] | Cost [member] | Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 1,199.0      
Transfers to assets subject to operating leases (656.2)      
Transfers from assets subject to operating leases       244.6
Ending balance 787.4     1,199.0
Machinery and equipment [member] | Accumulated depreciation [member] | Buildings used to operating leases [member]        
Disclosure Of Property Plant And Equipment Subject To Operating Lease [Line Items]        
Beginning balance 222.0      
Additions       133.5
Transfers to assets subject to operating leases (197.7)      
Transfers from assets subject to operating leases       68.3
Ending balance $ 226.1     $ 222.0