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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
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Book amount | ₩ 1,556,889 | ₩ 1,480,722
K Bank [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 1,865,010 | ₩ 1,800,856
Percentage of ownership | 33.72% | 33.72%
Share in net assets | ₩ 628,910 | ₩ 607,276
Intercompany transaction and others | 243,971 | 245,480
Book amount | 872,881 | 852,756
Hyundai Robotics Co., Ltd. [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 269,960 | ₩ 286,449
Percentage of ownership | 10.00% | 10.00%
Share in net assets | ₩ 26,996 | ₩ 28,645
Intercompany transaction and others | 20,738 | 20,727
Book amount | 47,734 | 49,372
KIF Investment Fund [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 531,164 | ₩ 512,936
Percentage of ownership | 33.33% | 33.33%
Share in net assets | ₩ 177,054 | ₩ 170,979
Book amount | 177,054 | 170,979
Megazone Cloud Corporation [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 547,786 | ₩ 635,035
Percentage of ownership | 6.83% | 6.83%
Share in net assets | ₩ 37,404 | ₩ 43,360
Intercompany transaction and others | 94,290 | 92,839
Book amount | 131,694 | 136,199
IGIS No. 4681 General Private Real Estate Investment Company [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 52,605 | ₩ 52,839
Percentage of ownership | 44.64% | 44.64%
Share in net assets | ₩ 23,484 | ₩ 23,589
Book amount | 23,484 | 23,589
KT-DSC creative economy youth start-up investment fund [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 87,908 | ₩ 77,430
Percentage of ownership | 28.57% | 28.57%
Share in net assets | ₩ 25,117 | ₩ 22,123
Book amount | 25,117 | 22,123
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 43,905 | ₩ 46,120
Percentage of ownership | 35.29% | 35.29%
Share in net assets | ₩ 15,496 | ₩ 16,278
Intercompany transaction and others | (3,554) | 342
Book amount | 11,942 | ₩ 16,620
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 122,961 |
Percentage of ownership | 7.30% | 32.90%
Share in net assets | ₩ 8,972 |
Intercompany transaction and others | 14,520 |
Book amount | ₩ 23,492 |

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