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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      
Mandatorily measured at FVTPL $ 687   $ 779
Hedging financial assets 2 $ 0 0
Financial assets at amortized cost (Note a) 62,405   71,852
Financial assets at FVOCI 7,193   7,154
Financial liabilities      
Measured at FVTPL Held for trading 0   0
Measured at amortized cost (Note b) $ 62,557   $ 34,434