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Financial Instruments by Category - Summary of Gains or Losses Arising From Financial Instruments by Category (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Interest income recognized as operating revenue ₩ 279,607 ₩ 271,925 ₩ 273,460
Interest expense recognized as operating expense 356,345 293,854 263,389
Profit and loss from foreign currency transaction 27,407 67,976 19,976
BC Card Co., Ltd. [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income recognized as operating revenue 112,973 68,869 27,440
Interest expense recognized as operating expense 55,677 27,060 5,458
Profit and loss from foreign currency transaction 5,597 3,569 2,373
Dividend income 1,759 2,299 1,340
Gain (loss) on valuation 11,112 7,860 ₩ 15,459
Gain Loss On Valuation Of derivatives 48 ₩ 418  
KT Cloud Co., Ltd. [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain on convertible preferred stock ₩ 311,312