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Contents of Significant Accounts - Intangible Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance $ 4,372,555    
Ending balance 4,154,315 $ 126,695 $ 4,372,555
Net carrying amount:      
Intangible assets 4,154,315   4,372,555
Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 10,565,271   12,061,215
Additions 2,284,641   2,746,105
Write-off (2,720,083)   (3,957,885)
Disposal of a subsidiary (3,151)    
Reclassifications 7,363   (5,855)
Exchange effect 351,221   (278,309)
Ending balance 10,485,262   10,565,271
Net carrying amount:      
Intangible assets 10,485,262   10,565,271
Accumulated amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (6,192,716)   (7,786,015)
Amortization 2,636,538   2,555,610
Write-off (2,720,083)   (3,957,885)
Disposal of a subsidiary (2,025)    
Exchange effect 223,801   (191,024)
Ending balance (6,330,947)   (6,192,716)
Net carrying amount:      
Intangible assets (6,330,947)   (6,192,716)
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 2,575,246    
Ending balance 2,245,384   2,575,246
Net carrying amount:      
Intangible assets 2,245,384   2,575,246
Software [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 5,466,077   5,669,787
Additions 1,328,781   1,399,699
Write-off (1,290,196)   (1,498,642)
Disposal of a subsidiary (3,151)    
Reclassifications 7,363   (5,855)
Exchange effect (32,375)   (98,912)
Ending balance 5,476,499   5,466,077
Net carrying amount:      
Intangible assets 5,476,499   5,466,077
Software [member] | Accumulated amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (2,890,831)   (2,689,397)
Amortization 1,656,180   1,741,898
Write-off (1,290,196)   (1,498,642)
Disposal of a subsidiary (2,025)    
Exchange effect (23,675)   (41,822)
Ending balance (3,231,115)   (2,890,831)
Net carrying amount:      
Intangible assets (3,231,115)   (2,890,831)
Patent and technology license fee [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 864,576    
Ending balance 879,682   864,576
Net carrying amount:      
Intangible assets 879,682   864,576
Patent and technology license fee [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 1,773,541   3,422,432
Additions 95,245   346,896
Write-off (214,874)   (1,826,383)
Reclassifications 0    
Exchange effect 388,567   (169,404)
Ending balance 2,042,479   1,773,541
Net carrying amount:      
Intangible assets 2,042,479   1,773,541
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 (908,965)   (2,597,513)
Amortization 216,437   277,768
Write-off (214,874)   (1,826,383)
Exchange effect 252,269   (139,933)
Ending balance (1,162,797)   (908,965)
Net carrying amount:      
Intangible assets (1,162,797)   (908,965)
Others [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 925,119    
Ending balance 1,021,635   925,119
Net carrying amount:      
Intangible assets 1,021,635   925,119
Others [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 3,310,641   2,953,984
Additions 860,615   999,510
Write-off (1,215,013)   (632,860)
Reclassifications 0    
Exchange effect (4,971)   (9,993)
Ending balance 2,951,272   3,310,641
Net carrying amount:      
Intangible assets 2,951,272   3,310,641
Others [member] | Accumulated amortisation and impairment [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance (2,385,522)   (2,491,707)
Amortization 763,921   535,944
Write-off (1,215,013)   (632,860)
Exchange effect (4,793)   (9,269)
Ending balance (1,929,637)   (2,385,522)
Net carrying amount:      
Intangible assets $ (1,929,637)   $ (2,385,522)