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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
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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 |  |

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