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Other Gains and Losses, Net
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Other Gains and Losses, Net
30.

OTHER GAINS AND LOSSES, NET

 

     Years Ended December 31  
     2016      2017      2018  
     NT$
(In Millions)		      NT$
(In Millions)		      NT$
(In Millions)		  

Gain (loss) on disposal of financial assets, net

         

Investments in debt instruments at FVTOCI

    $ —      $ —      $ (989.1 ) 

Available-for-sale financial assets

      33.2        89.8        —  

Gain (loss) on disposal of investments accounted for using equity method, net

      (260.0 )       —        —  

Gain (loss) from disposal of subsidiaries

      (36.1 )       17.3        —  

Net gain (loss) on financial instruments at FVTPL

         

Held for trading

      467.1        2,253.7        —  

Mandatorily measured at FVTPL

      —        —        (2,293.9 ) 

Designated as at FVTPL

      (37.4 )       131.0        —  

Gain (loss) arising from fair value hedges, net

      16.9        (30.3 )       (2.3 ) 

Impairment loss on financial assets

         

Available-for-sale financial assets

      (122.2 )       (29.6 )       —  

The reversal of expected credit loss of financial assets

         

Investments in debt instruments at FVTOCI

      —        —        2.0  

Financial assets at amortized cost

      —        —        0.4  

Other gains (losses), net

      134.4        385.5        (127.9 ) 
  

 

 

     

 

 

     

 

 

  
   $ 195.9      $ 2,817.4      $ (3,410.8 )