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Financial Instruments - Categories of Financial Instruments (Detail)
$ in Millions, $ in Millions
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Financial assets      
FVTPL (Note 1) $ 58.3   $ 2,259.4
FVTOCI (Note 2) 131,364.3   129,918.7
Hedging financial assets 0.3   0.1
Amortized cost (Note 3) 944,073.7   826,293.6
Financial assets 1,075,496.6   958,471.8
Financial liabilities      
FVTPL (Note 4) 1,828.3   94.1
Hedging financial liabilities 10.2 $ 0.4 1.2
Amortized cost (Note 5) 919,869.5   748,129.3
Financial liabilities $ 921,708.0   $ 748,224.6