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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      
Mandatorily measured at FVTPL $ 912   $ 687
Hedging financial assets 0 $ 0 2
Financial assets at amortized cost (Note a) 71,799   62,405
Financial assets at FVOCI 3,616   7,193
Financial liabilities      
Measured at FVTPL Held for trading 6   0
Hedging financial liabilities 8   0
Measured at amortized cost (Note b) $ 64,747   $ 62,557