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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance $ 26,821.7   $ 25,768.1  
Ending balance 25,999.2 $ 846.1 26,821.7 $ 25,768.1
Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 84,061.4   75,114.9 62,875.3
Additions 7,535.1   9,318.5 12,559.5
Disposals or retirements (96.3)   (318.7) (60.5)
Effect of exchange rate changes 428.3   (53.3) (259.4)
Ending balance 91,928.5   84,061.4 75,114.9
Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 57,239.7   49,346.8 42,222.3
Additions 8,756.1   8,207.2 7,186.2
Disposals or retirements (77.7)   (317.5) (59.9)
Effect of exchange rate changes 11.2   3.2 (1.8)
Ending balance 65,929.3   57,239.7 49,346.8
Goodwill [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,379.2   5,436.6  
Ending balance 5,791.8   5,379.2 5,436.6
Goodwill [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,379.2   5,436.6 5,693.4
Effect of exchange rate changes 412.6   (57.4) (256.8)
Ending balance 5,791.8   5,379.2 5,436.6
Technology license fees [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 8,621.6   9,935.5  
Ending balance 8,062.6   8,621.6 9,935.5
Technology license fees [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 23,534.0   22,161.7 15,855.0
Additions 2,253.0   1,372.8 6,308.9
Disposals or retirements (30.0)      
Effect of exchange rate changes 2.0   (0.5) (2.2)
Ending balance 25,759.0   23,534.0 22,161.7
Technology license fees [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 14,912.4   12,226.2 9,823.8
Additions 2,793.5   2,686.8 2,404.5
Disposals or retirements (11.4)      
Effect of exchange rate changes 1.9   (0.6) (2.1)
Ending balance 17,696.4   14,912.4 12,226.2
Software and system design costs [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 9,529.4   6,127.3  
Ending balance 9,837.4   9,529.4 6,127.3
Software and system design costs [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 43,651.0   36,239.0 33,024.0
Additions 5,079.0   7,726.2 3,275.8
Disposals or retirements (66.3)   (318.7) (60.5)
Effect of exchange rate changes 12.1   4.5 (0.3)
Ending balance 48,675.8   43,651.0 36,239.0
Software and system design costs [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 34,121.6   30,111.7 26,502.1
Additions 4,774.5   4,323.9 3,669.2
Disposals or retirements (66.3)   (317.5) (59.9)
Effect of exchange rate changes 8.6   3.5 0.3
Ending balance 38,838.4   34,121.6 30,111.7
Patent and others [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 3,291.5   4,268.7  
Ending balance 2,307.4   3,291.5 4,268.7
Patent and others [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 11,497.2   11,277.6 8,302.9
Additions 203.1   219.5 2,974.8
Effect of exchange rate changes 1.6   0.1 (0.1)
Ending balance 11,701.9   11,497.2 11,277.6
Patent and others [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 8,205.7   7,008.9 5,896.4
Additions 1,188.1   1,196.5 1,112.5
Effect of exchange rate changes 0.7   0.3 0.0
Ending balance $ 9,394.5   $ 8,205.7 $ 7,008.9