Investments Accounted for Using Equity Method (Tables)

12 Months Ended

Dec. 31, 2020

Associates consisted of the following:


		Place of Incorporation and Operation	Carrying Amount				% of Ownership and Voting Rights Held by the Company
Name of Associate	Principal Activities	Place of Incorporation and Operation	December 31, 2019		December 31, 2020		December 31, 2019	December 31, 2020
			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	$	8,960.5	$	8,964.1	28%	28%
Systems on Silicon Manufacturing Company Pte Ltd. (SSMC)	Manufacturing and selling of integrated circuits and other semiconductor devices	Singapore		6,502.2		5,900.2	39%	39%
Xintec Inc. (Xintec)	Wafer level chip size packaging and wafer level post passivation interconnection service	Taoyuan, Taiwan		1,842.8		2,522.3	41%	41%
Global Unichip Corporation (GUC)	Researching, developing, manufacturing, testing and marketing of integrated circuits	Hsinchu, Taiwan		1,274.8		1,315.4	35%	35%
Mutual-Pak	Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID	New Taipei, Taiwan		38.5		28.2	28%	28%


			$	18,618.8	$	18,730.2