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Segment Information - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($)
Disclosure Of Operating Segments [Line Items] |  |  |
Long-lived assets | $ 421,329 | $ 12,850 | $ 420,537
Information about major customers | Company did not have any single customer whose revenue exceeded 10% of the total revenues. |  |
Overseas [Member] |  |  |
Disclosure Of Operating Segments [Line Items] |  |  |
Long-lived assets | $ 2,948 |  | $ 3,093

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