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Financial Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Financial Assets [Abstract]  
Summary of Available-for-sale Financial Assets Non Current

 

 

 

December 31

 

 

 

2016

 

 

2017

 

 

 

NT$

 

 

NT$

 

 

 

(In Millions)

 

Equity securities

 

 

 

 

 

 

 

 

Domestic listed stocks

 

$

2,521

 

 

$

3,125

 

Domestic non-listed stocks

 

 

1,949

 

 

 

2,332

 

Foreign non-listed stocks

 

 

294

 

 

 

294

 

 

 

$

4,764

 

 

$

5,751