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Investments Accounted for Using the Equity Method - Summary of Aggregate Information of Associates that are Not Individually Material (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of associates and joint ventures [line items]        
Net income $ 33,816,910 $ 1,031,318 $ 37,307,860 $ 64,618,094
Other comprehensive income (loss) 13,638,305 415,929 449,350 8,632,472
TOTAL COMPREHENSIVE INCOME FOR THE YEAR 47,455,215 1,447,247 37,757,210 73,250,566
Associates that are not individually material [member]        
Disclosure of associates and joint ventures [line items]        
Net income 899,723 27,439 1,091,814 1,083,538
Other comprehensive income (loss) 142,182 4,336 2,439,733 (3,082,307)
TOTAL COMPREHENSIVE INCOME FOR THE YEAR $ 1,041,905 $ 31,775 $ 3,531,547 $ (1,998,769)