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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      
Mandatorily measured at FVTPL $ 779   $ 517
Hedging financial assets 0 $ 0 1
Financial assets at amortized cost (Note a) 71,852   70,241
Financial assets at FVOCI 7,154   6,933
Financial liabilities      
Measured at FVTPL Held for trading 0   1
Measured at amortized cost (Note b) $ 34,434   $ 40,334