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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance $ 25,999.2   $ 26,821.7  
Ending balance 22,766.7 $ 743.5 25,999.2 $ 26,821.7
Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 91,928.5   84,061.4 75,114.9
Additions 6,029.8   7,535.1 9,318.5
Disposals or retirements (4,289.2)   (96.3) (318.7)
Effect of exchange rate changes 13.1   428.3 (53.3)
Ending balance 93,682.2   91,928.5 84,061.4
Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 65,929.3   57,239.7 49,346.8
Additions 9,258.2   8,756.1 8,207.2
Disposals or retirements (4,289.1)   (77.7) (317.5)
Effect of exchange rate changes 17.1   11.2 3.2
Ending balance 70,915.5   65,929.3 57,239.7
Goodwill [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,791.8   5,379.2  
Ending balance 5,796.4   5,791.8 5,379.2
Goodwill [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,791.8   5,379.2 5,436.6
Effect of exchange rate changes 4.6   412.6 (57.4)
Ending balance 5,796.4   5,791.8 5,379.2
Technology license fees [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 8,062.6   8,621.6  
Ending balance 5,731.3   8,062.6 8,621.6
Technology license fees [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 25,759.0   23,534.0 22,161.7
Additions 461.1   2,253.0 1,372.8
Disposals or retirements 0.0   (30.0)  
Effect of exchange rate changes 1.3   2.0 (0.5)
Ending balance 26,221.4   25,759.0 23,534.0
Technology license fees [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 17,696.4   14,912.4 12,226.2
Additions 2,792.4   2,793.5 2,686.8
Disposals or retirements 0.0   (11.4)  
Effect of exchange rate changes 1.3   1.9 (0.6)
Ending balance 20,490.1   17,696.4 14,912.4
Software and system design costs [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 9,837.4   9,529.4  
Ending balance 9,470.3   9,837.4 9,529.4
Software and system design costs [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 48,675.8   43,651.0 36,239.0
Additions 4,947.4   5,079.0 7,726.2
Disposals or retirements (4,289.2)   (66.3) (318.7)
Effect of exchange rate changes (17.0)   12.1 4.5
Ending balance 49,317.0   48,675.8 43,651.0
Software and system design costs [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 38,838.4   34,121.6 30,111.7
Additions 5,308.1   4,774.5 4,323.9
Disposals or retirements (4,289.1)   (66.3) (317.5)
Effect of exchange rate changes (10.7)   8.6 3.5
Ending balance 39,846.7   38,838.4 34,121.6
Patent and others [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 2,307.4   3,291.5  
Ending balance 1,768.7   2,307.4 3,291.5
Patent and others [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 11,701.9   11,497.2 11,277.6
Additions 621.3   203.1 219.5
Effect of exchange rate changes 24.2   1.6 0.1
Ending balance 12,347.4   11,701.9 11,497.2
Patent and others [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 9,394.5   8,205.7 7,008.9
Additions 1,157.7   1,188.1 1,196.5
Effect of exchange rate changes 26.5   0.7 0.3
Ending balance $ 10,578.7   $ 9,394.5 $ 8,205.7