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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Gain on disposal of financial assets, net        
Investments in debt instruments at FVTOCI $ 93.2 $ 3.4 $ 1,439.4 $ 537.8
Loss on disposal of subsidiaries       (4.6)
Gain (loss) on financial instruments at FVTPL, net        
Mandatorily measured at FVTPL (7,973.6)   8,244.5 (2,360.7)
Gain arising from fair value hedges, net       13.1
The reversal (accrual) of expected credit loss of financial assets        
Investments in debt instruments at FVTOCI (1.3)   0.9 (6.9)
Financial assets at amortized cost 4.0   (4.6) 5.2
Other gains (losses), net 489.7   426.2 665.1
Other gains and losses $ (7,388.0) $ (266.3) $ 10,106.4 $ (1,151.0)