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Cover Page
 12 Months Ended
Dec. 31, 2023
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Fiscal Year Focus 2023
Document Period End Date Dec. 31, 2023
Document Fiscal Period Focus FY
Entity Registrant Name KT Corporation
Entity Central Index Key 0000892450
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 246,413,422
Entity Voluntary Filers No
Entity Address, Country KR
ICFR Auditor Attestation Flag true
Entity Interactive Data Current Yes
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Accounting Standard International Financial Reporting Standards
Entity File Number 1-14926
Entity Incorporation, State or Country Code M5
Entity Address, Address Line One KT Gwanghwamun Building East 33
Entity Address, Address Line Two Jong-ro 3-Gil
Entity Address, City or Town Jongno-gu
Entity Address, Postal Zip Code 03155
Auditor Name Deloitte Anjin LLC
Auditor Firm ID 1098
Auditor Location Seoul, Korea
Document Financial Statement Error Correction [Flag] false
Samil PricewaterhouseCoopers [Member]  
Document Information [Line Items]  
Auditor Name Samil PricewaterhouseCoopers
Auditor Firm ID 1103
Auditor Location Seoul, Korea
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Country KR
City Area Code 82
Local Phone Number 2-3495-3557
Entity Address, Address Line One KT Gwanghwamun Building East 33
Entity Address, Address Line Two Jong-ro 3-Gil
Entity Address, City or Town Jongno-gu
Entity Address, Postal Zip Code 03155
Contact Personnel Name Min Jang
Contact Personnel Email Address ktir@kt.com
ADS [Member]  
Document Information [Line Items]  
Trading Symbol KT
Title of 12(b) Security American Depositary Shares
Security Exchange Name NYSE
Ordinary shares [member]  
Document Information [Line Items]  
Trading Symbol KT
Title of 12(b) Security Ordinary share
Security Exchange Name NYSE