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Contents of Significant Accounts - Aging Analysis of Accounts Receivable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Disclosure of financial assets [line items]      
Accounts receivable $ 29,237,550 $ 954,851 $ 36,444,510
Cost [member]      
Disclosure of financial assets [line items]      
Accounts receivable 29,316,612   36,653,611
Neither past due [member] | Cost [member]      
Disclosure of financial assets [line items]      
Accounts receivable 25,707,008   30,545,437
Past due [member] | Cost [member]      
Disclosure of financial assets [line items]      
Accounts receivable 3,609,604   6,108,174
Past due [member] | Less than or equal to 30 days [member] | Cost [member]      
Disclosure of financial assets [line items]      
Accounts receivable 3,008,126   5,303,765
Past due [member] | 31 to 60 days [member] | Cost [member]      
Disclosure of financial assets [line items]      
Accounts receivable 78,668   130,408
Past due [member] | 61 to 90 days [member] | Cost [member]      
Disclosure of financial assets [line items]      
Accounts receivable 5,599   3,247
Past due [member] | 91 to 120 days [member] | Cost [member]      
Disclosure of financial assets [line items]      
Accounts receivable 0   7,886
Past due [member] | Greater than or equal to 121 days [member] | Cost [member]      
Disclosure of financial assets [line items]      
Accounts receivable $ 517,211   $ 662,868