XML 13 R1.htm IDEA: XBRL DOCUMENT v3.21.1
Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
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 241,842,130
Entity Voluntary Filers No
Entity Address, Country KR
ICFR Auditor Attestation Flag true
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Transition Report false
Document Annual Report true
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