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Financial Instruments - Categories of Financial Instruments (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Financial assets      
FVTPL (Note 1) $ 2,259.4   $ 326.8
FVTOCI (Note 2) 129,918.7   134,776.8
Hedging financial assets 0.1   25.9
Amortized cost (Note 3) 826,293.6   612,740.6
Financial assets 958,471.8   747,870.1
Financial liabilities      
FVTPL (Note 4) 94.1   982.3
Hedging financial liabilities 1.2 $ 0.1 1.8
Amortized cost (Note 5) 748,129.3   533,581.7
Financial liabilities $ 748,224.6   $ 534,565.8