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Contents of Significant Accounts - Inventories, Net - Additional Information (Detail) - TWD ($)
12 Months Ended
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