Investments Accounted for Using Equity Method (Tables)

12 Months Ended

Dec. 31, 2018

Associates consisted of the following:


		Place of	Carrying Amount				% of Ownership and Voting Rights Held by the Company
Name of Associate	Principal Activities	Incorporation and Operation	December 31, 2017		December 31, 2018		December 31, 2017		December 31, 2018
			NT$		NT$
			(In Millions)		(In Millions)
Vanguard International Semiconductor Corporation (VIS)	Manufacturing, selling, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks	Hsinchu, Taiwan	$	8,465.0	$	8,924.8		28%		28%
Systems on Silicon Manufacturing Company Pte Ltd. (SSMC)	Manufacturing and selling of integrated circuits and other semiconductor devices	Singapore		5,677.6		5,772.8		39%		39%
Xintec Inc. (Xintec)	Wafer level chip size packaging and wafer level post passivation interconnection service	Taoyuan, Taiwan		2,292.1		1,764.6		41%		41%
Global Unichip Corporation (GUC)	Researching, developing, manufacturing, testing and marketing of integrated circuits	Hsinchu, Taiwan		1,273.9		1,283.9		35%		35%
Mutual-Pak	Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID	New Taipei, Taiwan		23.2		22.9		39%		39%


			$	17,731.8	$	17,769.0