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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, 2023
Dec. 31, 2022
Financial assets-current    
Financial assets-current, Mandatorily measured at FVTPL $ 1 $ 4
Financial assets-noncurrent    
Non-derivatives 1,036 1,020
Forward exchange contracts [Member]    
Financial assets-current    
Derivatives (not designated for hedge) 1 3
Listed stocks domestic [Member]    
Financial assets-current    
Non-derivatives 0 1
Non listed stocks domestic [Member]    
Financial assets-noncurrent    
Non-derivatives 704 758
Non listed stocks foreign [Member]    
Financial assets-noncurrent    
Non-derivatives 89 103
Limited partnership - domestic [Member]    
Financial assets-noncurrent    
Non-derivatives 219 135
Film and drama investing agreements [Member]    
Financial assets-noncurrent    
Non-derivatives $ 24 $ 24