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Contents of Significant Accounts - Intangible Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance $ 4,275,200    
Ending balance 4,372,555 $ 142,801 $ 4,275,200
Net carrying amount:      
Intangible assets 4,372,555   4,275,200
Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 12,061,215   12,699,284
Additions 2,746,105   3,194,414
Write-off (3,957,885)   (4,071,911)
Reclassifications (5,855)   (10,721)
Exchange effect (278,309)   250,149
Ending balance 10,565,271   12,061,215
Net carrying amount:      
Intangible assets 10,565,271   12,061,215
Accumulated amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (7,786,015)   (9,054,351)
Amortization 2,555,610   2,689,600
Write-off (3,957,885)   (4,071,911)
Exchange effect (191,024)   113,975
Ending balance (6,192,716)   (7,786,015)
Net carrying amount:      
Intangible assets (6,192,716)   (7,786,015)
Goodwill [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 7,614    
Ending balance 7,614   7,614
Net carrying amount:      
Intangible assets 7,614   7,614
Goodwill [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 15,012   15,012
Additions 0    
Write-off 0    
Reclassifications 0    
Exchange effect 0    
Ending balance 15,012   15,012
Net carrying amount:      
Intangible assets 15,012   15,012
Goodwill [member] | Accumulated amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (7,398)   (7,398)
Amortization 0    
Write-off 0    
Exchange effect 0    
Ending balance (7,398)   (7,398)
Net carrying amount:      
Intangible assets (7,398)   (7,398)
Software [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 2,980,390    
Ending balance 2,575,246   2,980,390
Net carrying amount:      
Intangible assets 2,575,246   2,980,390
Software [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 5,669,787   4,845,037
Additions 1,399,699   2,713,534
Write-off (1,498,642)   (1,857,289)
Reclassifications (5,855)   (10,721)
Exchange effect (98,912)   (20,774)
Ending balance 5,466,077   5,669,787
Net carrying amount:      
Intangible assets 5,466,077   5,669,787
Software [member] | Accumulated amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (2,689,397)   (2,913,824)
Amortization 1,741,898   1,656,765
Write-off (1,498,642)   (1,857,289)
Exchange effect (41,822)   (23,903)
Ending balance (2,890,831)   (2,689,397)
Net carrying amount:      
Intangible assets (2,890,831)   (2,689,397)
Patent and technology license fee [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 824,919    
Ending balance 864,576   824,919
Net carrying amount:      
Intangible assets 864,576   824,919
Patent and technology license fee [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 3,422,432   4,491,164
Additions 346,896   0
Write-off (1,826,383)   (1,344,682)
Reclassifications 0    
Exchange effect (169,404)   275,950
Ending balance 1,773,541   3,422,432
Net carrying amount:      
Intangible assets 1,773,541   3,422,432
Patent and technology license fee [member] | Accumulated amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (2,597,513)   (3,324,667)
Amortization 277,768   475,870
Write-off (1,826,383)   (1,344,682)
Exchange effect (139,933)   141,658
Ending balance (908,965)   (2,597,513)
Net carrying amount:      
Intangible assets (908,965)   (2,597,513)
Others [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 462,277    
Ending balance 925,119   462,277
Net carrying amount:      
Intangible assets 925,119   462,277
Others [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 2,953,984   3,348,071
Additions 999,510   480,880
Write-off (632,860)   (869,940)
Reclassifications 0    
Exchange effect (9,993)   (5,027)
Ending balance 3,310,641   2,953,984
Net carrying amount:      
Intangible assets 3,310,641   2,953,984
Others [member] | Accumulated amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (2,491,707)   (2,808,462)
Amortization 535,944   556,965
Write-off (632,860)   (869,940)
Exchange effect (9,269)   (3,780)
Ending balance (2,385,522)   (2,491,707)
Net carrying amount:      
Intangible assets $ (2,385,522)   $ (2,491,707)