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Investments in Associates and Joint Ventures - Summary of Financial Information of Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | ₩ 14,594,246 | ₩ 12,690,014 |
Non-current assets | 28,197,401 | 28,299,796 |
Current liabilities | 13,247,637 | 10,699,268 |
Non-current liabilities | 11,001,436 | 11,877,846 |
Operating revenue | 26,287,201 | 25,638,855 | ₩ 24,898,005
Profit (loss) for the year | 972,182 | 1,385,635 | 1,459,395
Other comprehensive income(loss) | 7,447 | (2,194) | 165,567
Total comprehensive income(loss) | 979,629 | 1,383,441 | ₩ 1,624,962
K Bank Inc.[Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 21,320,790 | 16,562,742 |
Non-current assets | 89,812 | 71,265 |
Current liabilities | 19,541,076 | 14,830,983 |
Non-current liabilities | 4,516 | 2,168 |
Operating revenue | 946,559 | 558,872 |
Profit (loss) for the year | 10,560 | 86,498 |
Other comprehensive income(loss) | 56,609 | (24,888) |
Total comprehensive income(loss) | 67,169 | 61,610 |
Hyundai Robotics Co., Ltd. [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 251,868 | 278,413 |
Non-current assets | 134,424 | 135,380 |
Current liabilities | 106,557 | 63,009 |
Non-current liabilities | 9,775 | 64,335 |
Operating revenue | 167,949 | 181,944 |
Profit (loss) for the year | (17,513) | 9,332 |
Other comprehensive income(loss) | (1,093) | (49) |
Total comprehensive income(loss) | (18,606) | 9,283 |
KIF Investment Fund [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 128,344 | 98,132 |
Non-current assets | 402,819 | 414,804 |
Operating revenue | 33,017 | 19,916 |
Profit (loss) for the year | 16,330 | 7,505 |
Other comprehensive income(loss) | 0 | (11,779) |
Total comprehensive income(loss) | 16,330 | (4,274) |
Dividends received from associates | 1,139 | 6,531 |
Megazone Cloud Corporation [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 874,778 | 857,089 |
Non-current assets | 267,605 | 202,767 |
Current liabilities | 341,679 | 330,619 |
Non-current liabilities | 205,087 | 94,202 |
Operating revenue | 1,410,078 | 1,261,228 |
Profit (loss) for the year | (34,760) | (293,186) |
Other comprehensive income(loss) | (3,021) | (6,609) |
Total comprehensive income(loss) | (37,781) | (299,795) |
IGIS No. 4681 General Private Real Estate Investment Company [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 2,985 | 52,851 |
Non-current assets | 49,631 |  |
Current liabilities | 11 | 12 |
Operating revenue | 6 | 9 |
Profit (loss) for the year | (234) | (3,161) |
Total comprehensive income(loss) | (234) | (3,161) |
KT-DSC creative economy youth start-up investment fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 482 | 908 |
Non-current assets | 87,528 | 76,884 |
Current liabilities | 101 | 362 |
Operating revenue | 19,849 | 19,931 |
Profit (loss) for the year | 12,227 | (53) |
Total comprehensive income(loss) | 12,227 | (53) |
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 5,690 | 9,344 |
Non-current assets | 145,769 | 127,321 |
Current liabilities | 107,553 | 90,545 |
Profit (loss) for the year | (406) | (474) |
Total comprehensive income(loss) | (406) | ₩ (474) |
LS Marine Solution Co Ltd Formerly KT Submarine Co Ltd [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 66,767 |  |
Non-current assets | 80,307 |  |
Current liabilities | 23,906 |  |
Non-current liabilities | 207 |  |
Operating revenue | 70,779 |  |
Profit (loss) for the year | 11,618 |  |
Other comprehensive income(loss) | (289) |  |
Total comprehensive income(loss) | ₩ 11,329 |  |

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