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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
TextBlock [abstract]  
Detail Information of Subsidiaries
The detail information of the subsidiaries at the end of reporting period was as follows:
 
        
Percentage of Ownership
  
Name of Investor
 
Name of Investee
 
Main Businesses and Products
 
Establishment
and Operating
Location
 
December 31,
2018
 
December 31,
2019
 
Note
TSMC
 TSMC North America 
Selling and marketing of integrated circuits and other semiconductor devices
 San Jose, California, U.S.A. 100% 100% —
 TSMC Europe B.V. (TSMC Europe) Customer service and supporting activities 
Amsterdam, the Netherlands
 100% 100% a)
 TSMC Japan Limited (TSMC Japan) Customer service and supporting activities Yokohama, Japan 100% 100% a)
 TSMC Korea Limited (TSMC Korea) Customer service and supporting activities Seoul, Korea 100% 100% a)
 TSMC Partners, Ltd. (TSMC Partners) 
Investing in companies involved in the design, manufacture, and other related business in the semiconductor industry and other investment activities
 
Tortola, British Virgin Islands
 100% 100% a)
 TSMC Global, Ltd. (TSMC Global) Investment activities 
Tortola, British Virgin Islands
 100% 100% —
 TSMC China Company Limited (TSMC China) 
Manufacturing, selling, testing and computer-aided design of integrated circuits and other semiconductor devices
 Shanghai, China 100% 100% —
 TSMC Nanjing Company Limited (TSMC Nanjing) 
Manufacturing, selling, testing and computer-aided design of integrated circuits and other semiconductor devices
 Nanjing, China 100% 100% b)
 VisEra Technologies Company Ltd. (VisEra Tech) 
Engaged in manufacturing electronic spare parts and in researching, developing, designing, manufacturing, selling, packaging and testing of color filter
 
Hsin-Chu,
Taiwan		 87% 87% —
 VentureTech Alliance Fund II, L.P. (VTAF II) 
Investing in new
start-up
technology companies
 Cayman Islands 98% 98% a)
 VentureTech Alliance Fund III, L.P. (VTAF III) Investing in new
start-up
technology companies		 Cayman Islands 98% 98% a)
 TSMC Solar Europe GmbH 
Selling of solar related products and providing customer service
 Hamburg, Germany 100% — a) , c)
TSMC Partners
 
TSMC Development, Inc. (TSMC Development)
 
Investing in companies involved in the manufacturing related business in the semiconductor industry
 Delaware, U.S.A. 100% 100% —
 
TSMC Technology, Inc. (TSMC Technology)
 Engineering support activities Delaware, U.S.A. 100% 100% a)
 
TSMC Design Technology Canada Inc. (TSMC Canada)
 Engineering support activities Ontario, Canada 100% 100% a)
 
InveStar Semiconductor Development Fund, Inc. (ISDF)
 Investing in new
start-up
technology companies		 Cayman Islands   97% 97% a) , d)
 
InveStar Semiconductor Development Fund, Inc. (II) LDC. (ISDF II)
 Investing in new
start-up
technology companies		 Cayman Islands   97% 97% a) , d)
TSMC Development
 
WaferTech, LLC (WaferTech)
 
Manufacturing, selling and testing of integrated circuits and other semiconductor devices
 Washington, U.S.A. 100% 100% —
VTAF III
 
Growth Fund Limited (Growth Fund)
 Investing in new
start-up
technology companies		 Cayman Islands 100% 100% a)
 
 Note a:
This is an immaterial subsidiary for which the consolidated financial statements are not audited by the Company’s independent auditors.
 
 Note b:
Under the investment agreement entered into with the municipal government of Nanjing, China, the Company will make an investment in Nanjing in the amount of approximately US$3 billion to establish a subsidiary operating a 300mm wafer fab with the capacity of 20,000
12-inch
wafers per month, and a design service center.
 
 Note c:
TSMC Solar Europe GmbH has completed the liquidation procedures in March 2019.
 
 Note d:
The subsidiary is under liquidation procedures.