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Contents of Significant Accounts - Details of Distribution of Employees' Compensation and Directors' Compensation (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]      
Employees' compensation – Cash $ 4,509,603 $ 5,439,059 $ 9,160,485
Directors' compensation $ 45,000 $ 45,000 $ 45,000