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Contents of Significant Accounts - Aging Analysis of Accounts Receivable (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Accounts receivable | $ 32,723,426 | $ 997,970 | $ 29,237,550
Cost [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Accounts receivable | 32,734,422 |  | 29,316,612
Neither past due [member] | Cost [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Accounts receivable | 29,338,097 |  | 25,707,008
Past due [member] | Cost [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Accounts receivable | 3,396,325 |  | 3,609,604
Past due [member] | Less than or equal to 30 days [member] | Cost [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Accounts receivable | 3,292,457 |  | 3,008,126
Past due [member] | 31 to 60 days [member] | Cost [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Accounts receivable | 77,929 |  | 78,668
Past due [member] | 61 to 90 days [member] | Cost [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Accounts receivable | 1,249 |  | 5,599
Past due [member] | 91 to 120 days [member] | Cost [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Accounts receivable | 1,115 |  | 0
Past due [member] | Greater than or equal to 121 days [member] | Cost [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Accounts receivable | $ 23,575 |  | $ 517,211

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