Investments Accounted for Using Equity Method - Summary of Investments in Associates (Detail) $ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)	Dec. 31, 2018 USD ($)
Disclosure of associates [line items]
Carrying Amount	$ 17,769.0	$ 17,731.8	$ 580.5
Vanguard International Semiconductor Corporation [member]
Disclosure of associates [line items]
Principal Activities	Manufacturing, selling, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks
Place of Incorporation and Operation	Hsinchu, Taiwan
Carrying Amount	$ 8,924.8	$ 8,465.0
% of Ownership and Voting Rights Held by the Company	28.00%	28.00%
Systems on Silicon Manufacturing Company Pte Ltd. [member]
Disclosure of associates [line items]
Principal Activities	Manufacturing and selling of integrated circuits and other semiconductor devices
Place of Incorporation and Operation	Singapore
Carrying Amount	$ 5,772.8	$ 5,677.6
% of Ownership and Voting Rights Held by the Company	39.00%	39.00%
Xintec Inc. [member]
Disclosure of associates [line items]
Principal Activities	Wafer level chip size packaging and wafer level post passivation interconnection service
Place of Incorporation and Operation	Taoyuan, Taiwan
Carrying Amount	$ 1,764.6	$ 2,292.1
% of Ownership and Voting Rights Held by the Company	41.00%	41.00%
Global Unichip Corporation [member]
Disclosure of associates [line items]
Principal Activities	Researching, developing, manufacturing, testing and marketing of integrated circuits
Place of Incorporation and Operation	Hsinchu, Taiwan
Carrying Amount	$ 1,283.9	$ 1,273.9
% of Ownership and Voting Rights Held by the Company	35.00%	35.00%
Mutual-Pak Technology Co., Ltd [member]
Disclosure of associates [line items]
Principal Activities	Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID
Place of Incorporation and Operation	New Taipei, Taiwan
Carrying Amount	$ 22.9	$ 23.2
% of Ownership and Voting Rights Held by the Company	39.00%	39.00%

The description of the nature of the entity's operations and principal activities.

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The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

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The principal place of business of an associate. [Refer: Principal place of business; Associates [member]]

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