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Summary of Material Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure Of Summary Of Material Accounting Policies [Abstract]  
Consolidated Entities
  b.
The consolidated entities as of December
 31, 2023 and 2024 were as follows:
 
               Percentage of ownership (%)
As of December 31,		  
Investor
   
Subsidiary
   
Business nature
    2023      2024  
UMC
   
UMC GROUP (USA)
   
IC Sales
      100.00        100.00  
UMC
   
UNITED MICROELECTRONICS (EUROPE) B.V. (UME BV)
   
Marketing support activities
      100.00        100.00  
UMC
   
UMC CAPITAL CORP.
   
Investment holding
      100.00        100.00  
UMC
   
GREEN EARTH LIMITED (GE)
   
Investment holding
      100.00        100.00  
UMC
   
TLC CAPITAL CO., LTD. (TLC)
   
Venture capital
      100.00        100.00  
UMC
   
UMC INVESTMENT (SAMOA) LIMITED
   
Investment holding
      100.00        100.00  
UMC
   
FORTUNE VENTURE CAPITAL CORP. (FORTUNE)
   
Consulting and planning for venture capital
      100.00        100.00  
UMC
   
UMC KOREA CO., LTD. (UMC KOREA)
   
Marketing support activities
      100.00        100.00  
UMC
   
OMNI GLOBAL LIMITED (OMNI)
   
Investment holding
      100.00        100.00  
UMC
   
SINO PARAGON LIMITED
   
Investment holding
      100.00        100.00  
UMC
   
BEST ELITE INTERNATIONAL LIMITED (BE)
   
Investment holding
      100.00        100.00  
UMC
   
UNITED SEMICONDUCTOR JAPAN CO., LTD. (USJC)
   
Sales and manufacturing of integrated circuits
      100.00        100.00  
UMC and FORTUNE
   
WAVETEK MICROELECTRONICS CORPORATION (WAVETEK)
   
Sales and manufacturing of integrated circuits
      80.00        79.54  
TLC
   
SOARING CAPITAL CORP.
   
Investment holding
      100.00        100.00  
SOARING CAPITAL CORP.
   
UNITRUTH ADVISOR (SHANGHAI) CO., LTD.
   
Investment holding and advisory
      100.00        100.00  
GE
   
UNITED MICROCHIP CORPORATION
   
Investment holding
      100.00        100.00  
FORTUNE
   
TERA ENERGY DEVELOPMENT CO., LTD. (TERA ENERGY)
   
Energy technical services
      99.01        94.93  
TERA ENERGY
   
EVERRICH ENERGY INVESTMENT (HK) LIMITED
(EVERRICH-HK)
   
Investment holding
      100.00        100.00  
EVERRICH-HK
   
EVERRICH (JINING) NEW ENERGY TECHNOLOGY CO., LTD. (formerly EVERRICH (SHANDONG) ENERGY CO., LTD.)
   
Solar engineering integrated design services
      100.00        100.00  
OMNI
   
UNITED MICROTECHNOLOGY CORPORATION (CALIFORNIA)
   
Research and development
      100.00        100.00  
OMNI
   
ECP VITA PTE. LTD.
   
Insurance
      100.00        100.00  
WAVETEK
   
WAVETEK MICROELECTRONICS CORPORATION (USA)
   
Marketing service
      100.00        100.00  
BE
   
INFOSHINE TECHNOLOGY LIMITED (INFOSHINE)
   
Investment holding
      100.00        100.00  
INFOSHINE
   
OAKWOOD ASSOCIATES LIMITED (OAKWOOD)
   
Investment holding
      100.00        100.00  
OAKWOOD
   
HEJIAN TECHNOLOGY (SUZHOU) CO., LTD. (HEJIAN)
   
Sales and manufacturing of integrated circuits
      99.9985        99.9985  
HEJIAN
   
UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS) (Note)
   
Integrated circuits design services
      100.00        —   
UNITED MICROCHIP CORPORATION and HEJIAN
   
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM)
   
Sales and manufacturing of integrated circuits
      100.00        100.00  
 
  Note:
In August 2024, HEJIAN has disposed of its 100% of ownership interest in the subsidiary, UDS. Please refer to Note 7.