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Financial Instruments at Fair Value Through Profit or Loss - Summary of Financial Instruments at Fair Value through Profit or Loss (Detail) - TWD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Financial assets-current    
Financial assets-current, Mandatorily measured at FVTPL $ 0 $ 1
Financial assets-noncurrent    
Non-derivatives 1,005 1,036
Forward exchange contracts [Member]    
Financial assets-current    
Derivatives (not designated for hedge) 0 1
Listed stocks domestic [Member]    
Financial assets-current    
Non-derivatives 0 0
Non listed stocks domestic [Member]    
Financial assets-noncurrent    
Non-derivatives 629 704
Non listed stocks foreign [Member]    
Financial assets-noncurrent    
Non-derivatives 32 89
Limited partnership - domestic [Member]    
Financial assets-noncurrent    
Non-derivatives 307 219
Other investing agreements [Member]    
Financial assets-noncurrent    
Non-derivatives $ 37 $ 24