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Investments in Associates and Joint Ventures - Summary of Reconciliation of Carrying Amount of Interests in the Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Book amount | ₩ 1,480,722 | ₩ 1,288,429
K Bank [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 1,800,856 | ₩ 1,737,237
Percentage of ownership | 33.72% | 33.72%
Share in net assets | ₩ 607,276 | ₩ 585,837
Intercompany transaction and others | 245,480 | 245,900
Book amount | 852,756 | 831,737
KT-IBKC future investment fund [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets |  | ₩ 24,163
Percentage of ownership |  | 50.00%
Share in net assets |  | ₩ 12,081
Book amount |  | 12,081
Hyundai Robotics Co., Ltd. [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 286,449 | ₩ 279,461
Percentage of ownership | 10.00% | 10.00%
Share in net assets | ₩ 28,645 | ₩ 27,946
Intercompany transaction and others | 20,727 | 20,779
Book amount | 49,372 | 48,725
K-Realty CR-REITs No.1 [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets |  | ₩ 208,825
Percentage of ownership |  | 30.05%
Share in net assets |  | ₩ 62,752
Intercompany transaction and others |  | 4,906
Book amount |  | 67,658
KIF Investment Fund [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 512,936 | ₩ 536,804
Percentage of ownership | 33.33% | 33.33%
Share in net assets | ₩ 170,979 | ₩ 178,935
Book amount | 170,979 | ₩ 178,935
Megazone Cloud Corporation [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 635,035 |
Percentage of ownership | 6.83% |
Share in net assets | ₩ 43,360 |
Intercompany transaction and others | 92,839 |
Book amount | 136,199 |
IGIS No. 4681 General Private Real Estate Investment Company [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 52,839 |
Percentage of ownership | 44.64% |
Share in net assets | ₩ 23,589 |
Book amount | 23,589 |
KT-DSC creative economy youth start-up investment fund [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 77,430 |
Percentage of ownership | 28.57% | 28.60%
Share in net assets | ₩ 22,123 |
Book amount | 22,123 |
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 46,120 |
Percentage of ownership | 35.29% | 35.30%
Share in net assets | ₩ 16,278 |
Intercompany transaction and others | 342 |
Book amount | ₩ 16,620 |

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