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Investments in Associates and Joint Ventures - Summary of Details of Associates (Detail)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
KIF Investment Fund [Member]    
Disclosure of associates [line items]    
Percentage of ownership 33.33% 33.33%
Location Korea Korea
Date of financial statements December December
K Bank [member]    
Disclosure of associates [line items]    
Percentage of ownership 33.72% 33.72%
Location Korea Korea
Date of financial statements December December
Hyundai Robotics Co., Ltd. [member]    
Disclosure of associates [line items]    
Percentage of ownership 10.00% 10.00%
Location Korea Korea
Date of financial statements December December
Megazone Cloud Corporation [Member]    
Disclosure of associates [line items]    
Percentage of ownership 6.83% 6.83%
Location Korea Korea
Date of financial statements December December
IGIS No. 4681 General Private Real Estate Investment Company [Member]    
Disclosure of associates [line items]    
Percentage of ownership 44.64% 44.64%
Location Korea Korea
Date of financial statements December December
KT-DSC creative economy youth start-up investment fund [member]    
Disclosure of associates [line items]    
Percentage of ownership 28.57% 28.57%
Location Korea Korea
Date of financial statements December December
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member]    
Disclosure of associates [line items]    
Percentage of ownership 35.29% 35.29%
Location Korea Korea
Date of financial statements December December
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member]    
Disclosure of associates [line items]    
Percentage of ownership 7.30% 32.90%
Location Korea Korea
Date of financial statements December December