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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Cash Flows From Operating Activities [Line Items] |  |  |
Interest income | ₩ 271,925 | ₩ 273,460 | ₩ 270,571
Interest expenses | 293,854 | 263,389 | 263,579
Gain loss valuation Of financial assets | 44,833 | (64,660) | (64,660)
BC Card Co Ltd [Member] |  |  |
Disclosure Of Cash Flows From Operating Activities [Line Items] |  |  |
Interest income | 68,869 | 27,440 | 20,854
Interest expenses | 27,060 | 5,458 | 1,456
Dividend income | 2,299 | ₩ 1,340 | ₩ 2,059
KT Estate Inc [Member] |  |  |
Disclosure Of Cash Flows From Operating Activities [Line Items] |  |  |
Gains (losses) on disposals of investment properties | 95,129 |  |
KT Investment Co Ltd [Member] |  |  |
Disclosure Of Cash Flows From Operating Activities [Line Items] |  |  |
Gain loss valuation Of financial assets | ₩ 7,859 |  |

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