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Contents of Significant Accounts - Financial Assets at Fair Value through Profit or Loss (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Disclosure of financial assets [line items]      
Total $ 17,138,461   $ 18,490,569
Current 443,601 $ 14,487 705,918
Noncurrent 16,694,860 $ 545,227 17,784,651
Common stocks [member]      
Disclosure of financial assets [line items]      
Financial assets mandatorily measured at fair value through profit or loss 9,170,230   10,275,563
Preferred stocks [member]      
Disclosure of financial assets [line items]      
Financial assets mandatorily measured at fair value through profit or loss 2,862,119   2,939,939
Funds [member]      
Disclosure of financial assets [line items]      
Financial assets mandatorily measured at fair value through profit or loss 4,472,097   5,044,702
Convertible bonds [member]      
Disclosure of financial assets [line items]      
Financial assets mandatorily measured at fair value through profit or loss 480,715   230,365
Others [member]      
Disclosure of financial assets [line items]      
Financial assets mandatorily measured at fair value through profit or loss $ 153,300   $ 0