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Contents of Significant Accounts - Aggregate Amount of the Company's Share of its Individually Immaterial Associates (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of associates [line items]        
Profit from continuing operations $ 4,307,614 $ 140,680 $ 1,626,103 $ 5,193,495
Aggregated individually immaterial associates [member]        
Disclosure of associates [line items]        
Profit from continuing operations 4,307,614   1,626,103 5,193,495
Other comprehensive income (loss) 1,540,436   (1,706,960) 2,965,202
Total comprehensive income (loss) $ 5,848,050   $ (80,857) $ 8,158,697