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Financial Instruments - Categories of Financial Instruments (Detail)
$ in Millions, $ in Millions
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Financial assets      
FVTPL (Note 1) $ 326.8   $ 3,504.6
FVTOCI (Note 2) 134,776.8   107,067.5
Hedging financial assets 25.9   23.5
Amortized cost (Note 3) 612,740.6   745,585.8
Financial assets 747,870.1   856,181.4
Financial liabilities      
FVTPL (Note 4) 982.3   40.8
Hedging financial liabilities 1.8 $ 0.1 155.8
Amortized cost (Note 5) 533,581.7   318,475.8
Financial liabilities $ 534,565.8   $ 318,672.4