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Contents of Significant Accounts - Bonds Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Disclosure of detailed information about bonds [Line Items]      
Bonds payable $ 30,051,568   $ 38,359,352
Less: Current or exchangeable portion due within one year (5,466,589)   (13,779,701)
Net 24,584,979 $ 749,771 24,579,651
Less: Discounts on bonds payable [member]      
Disclosure of detailed information about bonds [Line Items]      
Bonds payable (305,805)   (498,021)
Unsecured domestic bonds payable [member] | Cost [member]      
Disclosure of detailed information about bonds [Line Items]      
Bonds payable 24,600,000   33,100,000
Unsecured exchangeable bonds payable [member] | Cost [member]      
Disclosure of detailed information about bonds [Line Items]      
Bonds payable $ 5,757,373   $ 5,757,373