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Contents of Significant Accounts - Inventories, Net - Additional Information (Detail) - TWD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Classes Of Inventories [Abstract] |  |  |
Inventories recognized in operating costs | $ 148,575,000,000 | $ 136,902,000,000 | $ 145,979,000,000
Write-down of inventories | 858,000,000 | 1,148,000,000 | $ 98,000,000
Inventories pledged | $ 0 | $ 0 |

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