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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, 2024 | Dec. 31, 2023
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Book amount | ₩ 1,562,232 | ₩ 1,556,889
K Bank [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 2,004,530 | ₩ 1,865,010
Percentage of ownership | 33.72% | 33.72%
Share in net assets | ₩ 675,958 | ₩ 628,910
Intercompany transaction and others | 241,683 | 243,971
Book amount | 917,641 | 872,881
Hyundai Robotics Co., Ltd. [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 250,819 | ₩ 269,960
Percentage of ownership | 10.00% | 10.00%
Share in net assets | ₩ 25,082 | ₩ 26,996
Intercompany transaction and others | 20,748 | 20,738
Book amount | 45,830 | 47,734
KIF Investment Fund [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 573,376 | ₩ 531,164
Percentage of ownership | 33.33% | 33.33%
Share in net assets | ₩ 191,125 | ₩ 177,054
Book amount | 191,125 | 177,054
Megazone Cloud Corporation [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 548,558 | ₩ 547,786
Percentage of ownership | 6.83% | 6.83%
Share in net assets | ₩ 37,457 | ₩ 37,404
Intercompany transaction and others | 93,316 | 94,290
Book amount | 130,773 | 131,694
IGIS No. 468-1 General Private Real Estate Investment Company [Member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 52,359 | ₩ 52,605
Percentage of ownership | 44.64% | 44.64%
Share in net assets | ₩ 23,374 | ₩ 23,484
Book amount | 23,374 | 23,484
KT-DSC creative economy youth start-up investment fund [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 55,827 | ₩ 87,908
Percentage of ownership | 28.57% | 28.57%
Share in net assets | ₩ 15,951 | ₩ 25,117
Book amount | 15,951 | 25,117
IGIS No. 395 Professional Investors Private Investment Real Estate Investment LLC [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets | ₩ 41,663 | ₩ 43,905
Percentage of ownership | 35.29% | 35.29%
Share in net assets | ₩ 14,705 | ₩ 15,496
Intercompany transaction and others | (4,978) | (3,554)
Book amount | ₩ 9,727 | 11,942
IGILS Marine Solution Co., Ltd. [member] |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |
Net assets |  | ₩ 122,961
Percentage of ownership |  | 7.30%
Share in net assets |  | ₩ 8,972
Intercompany transaction and others |  | 14,520
Book amount |  | ₩ 23,492

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