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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Cash Flows From Operating Activities [Line Items] |  |  |
Interest income | ₩ 303,535 | ₩ 279,607 | ₩ 271,925
Interest expenses | 374,665 | 356,345 | 293,854
Gain loss valuation Of financial assets | 95,118 | 13,920 | 44,833
BC Card Co Ltd [Member] |  |  |
Disclosure Of Cash Flows From Operating Activities [Line Items] |  |  |
Interest income | 106,005 | 112,973 | 68,869
Interest expenses | 57,872 | 55,677 | 27,060
Dividend income | 1,701 | 1,759 | ₩ 2,299
KT Estate Inc [Member] |  |  |
Disclosure Of Cash Flows From Operating Activities [Line Items] |  |  |
Gains (losses) on disposals of investment properties | 28,725 | 49,752 |
KT Investment Co Ltd [Member] |  |  |
Disclosure Of Cash Flows From Operating Activities [Line Items] |  |  |
Gain loss valuation Of financial assets | ₩ 576 | ₩ 11,112 |

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