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Financial Instruments - Categories of Financial Instruments (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Financial assets      
Financial assets measured at FVTPL $ 517   $ 0
Hedging financial assets 1 $ 0 0
Loans and receivables (Note a)     68,983
Available-for-sale financial assets     5,751
Financial assets at amortized cost (Note a) 70,241    
Financial assets at FVOCI 6,933    
Financial liabilities      
Measured at FVTPL Held for trading 1   1
Measured at amortized cost (Note b) 40,334   39,725
Cash flow hedges [member]      
Financial liabilities      
Hedging derivative financial liabilities $ 0   $ 1