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Other Gains and Losses - Summary of Other Gains and Losses, Net (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Loss on disposal of financial assets, net        
Investments in debt instruments at FVTOCI $ (683.1) $ (20.8) $ (473.9) $ (410.1)
Gain on disposal of investments accounted for using equity method, net 7.1   15.7  
Gain (loss) on financial instruments at FVTPL, net        
Mandatorily measured at FVTPL (8,204.7)   6,523.1 (622.5)
Provision for expected credit loss for financial assets        
Investments in debt instruments at FVTOCI (12.3)   (9.5) (0.9)
Financial assets at amortized cost (37.6)   (26.2) (51.5)
Other gains,net 551.2   932.4 72.8
Other gains and losses $ (8,379.4) $ (255.6) $ 6,961.6 $ (1,012.2)