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Financial Instruments - Categories of Financial Instruments (Detail)
$ in Millions, $ in Millions
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Financial assets      
FVTPL (Note 1) $ 159.0   $ 2,259.4
FVTOCI (Note 2) 129,607.1   129,918.7
Hedging financial assets 13.5   0.1
Amortized cost (Note 3) 1,283,715.7   826,293.6
Financial assets 1,413,495.3   958,471.8
Financial liabilities      
FVTPL (Note 4) 681.9   94.1
Hedging financial liabilities 9.6 $ 0.3 1.2
Amortized cost (Note 5) 1,355,957.2   748,129.3
Financial liabilities $ 1,356,648.7   $ 748,224.6