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Borrowings - Summary of Korean Won and Foreign Currency Borrowings (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2023
shares
Disclosure of detailed information about borrowings [line items]  
Interest rate 0.00%
Maturity yield 5.00%
Storywiz Co Ltd [Member]  
Disclosure of detailed information about borrowings [line items]  
Appraisal period of common stock conversion to debt (appraisal period: June 5, 2021~May 4, 2025)
KT Cloud [Member]  
Disclosure of detailed information about borrowings [line items]  
Conversion of bonds to common shares, shares 73,800
Conversion of bonds to preference shares, shares 73,800