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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, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Gain (loss) on disposal of financial assets, net        
Investments in debt instruments at FVTOCI $ (473.9) $ (15.5) $ (410.1) $ 93.2
Gain on disposal of investments accounted for using equity method, net 15.7      
Gain (loss) on financial instruments at FVTPL, net        
Mandatorily measured at FVTPL 6,523.1   (622.5) (7,973.6)
The reversal (accrual) of expected credit loss of financial assets        
Investments in debt instruments at FVTOCI (9.5)   (0.9) (1.3)
Financial assets at amortized cost (26.2)   (51.5) 4.0
Other gains,net 932.4   72.8 489.7
Other gains and losses $ 6,961.6 $ 227.3 $ (1,012.2) $ (7,388.0)