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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Gain (loss) on disposal of financial assets, net        
Investments in debt instruments at FVTOCI $ (410.1) $ (13.3) $ 93.2 $ 1,439.4
Gain (loss) on financial instruments at FVTPL, net        
Mandatorily measured at FVTPL (622.5)   (7,973.6) 8,244.5
The reversal (accrual) of expected credit loss of financial assets        
Investments in debt instruments at FVTOCI (0.9)   (1.3) 0.9
Financial assets at amortized cost (51.5)   4.0 (4.6)
Other gains,net 72.8   489.7 426.2
Other gains and losses $ (1,012.2) $ (32.9) $ (7,388.0) $ 10,106.4