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Other Gains and Losses - Summary of Other Gains and Losses, Net (Detail)
$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
TWD ($)
Gain on disposal of financial assets, net      
Investments in debt instruments at FVTOCI $ 169.3 $ 6.1 $ 926.9
Gain (loss) on financial instruments at FVTPL, net      
Mandatorily measured at FVTPL (2,398.9)   (1,507.8)
The reversal (accrual) of expected credit loss of financial assets      
Investments in debt instruments at FVTOCI (1.6)   0.2
Financial assets at amortized cost 4.9   (0.4)
Other gains, net 273.1   79.3
Other gains and losses $ (1,953.2) $ (70.0) $ (501.8)