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Summary of Material Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
Disclosure Of Summary Of Material Accounting Policies [Abstract]  
Consolidated Entities
  b.
The consolidated entities as of December
 31, 2022 and 2023 were as follows:

  
 
  
 
  
Percentage of ownership (%)
As of December 31,
 
Investor
  
Subsidiary
  
Business nature
  
2022
 
  
2023
 
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
      80.14        80.00  
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
      100.00        99.01  
TERA ENERGY   
EVERRICH ENERGY INVESTMENT (HK) LIMITED
(EVERRICH-HK)
   
Investment holding
      100.00        100.00  
EVERRICH-HK   
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  
WAVETEK   
WAVETEK MICROELECTRONICS INVESTMENT (SAMOA) LIMITED (WAVETEK-SAMOA)
    Investment holding      100.00        —   
WAVETEK-SAMOA   
WAVETEK MICROELECTRONICS CORPORATION (USA)
   
Marketing service
      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. (HJ)
   
Sales and manufacturing of integrated circuits
      99.9985        99.9985  
HJ   
UNITEDDS SEMICONDUCTOR (SHANDONG) CO., LTD. (UDS)
   
Integrated circuits design services
      100.00        100.00  
UNITED MICROCHIP CORPORATION and HJ   
UNITED SEMICONDUCTOR (XIAMEN) CO., LTD. (USCXM)
   
Sales and manufacturing of integrated circuits
      71.86        100.00