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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | ₩ 12,690,014 | ₩ 11,858,350 |
Non-current assets | 28,299,796 | 25,300,991 |
Current liabilities | 10,699,268 | 10,072,432 |
Non-current liabilities | 11,877,846 | 10,519,748 |
Operating revenue | 25,638,855 | 24,898,005 | ₩ 24,099,394
Profit (loss) for the year | 1,385,635 | 1,459,395 | 746,256
Other comprehensive income(loss) | (2,194) | 165,567 | 23,255
Total comprehensive income(loss) | 1,383,441 | 1,624,962 | ₩ 769,511
KT-IBKC future investment fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets |  | 24,163 |
Operating revenue |  | 5,912 |
Profit (loss) for the year |  | 3,184 |
Total comprehensive income(loss) |  | 3,184 |
K Bank Inc.[Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 16,562,742 | 13,263,658 |
Non-current assets | 71,265 | 70,362 |
Current liabilities | 14,830,983 | 11,594,316 |
Non-current liabilities | 2,168 | 2,467 |
Operating revenue | 558,872 | 287,775 |
Profit (loss) for the year | 86,498 | 21,728 |
Other comprehensive income(loss) | (24,888) | (28,211) |
Total comprehensive income(loss) | 61,610 | (6,483) |
Hyundai Robotics Co., Ltd. [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 278,413 | 308,776 |
Non-current assets | 135,380 | 120,221 |
Current liabilities | 63,009 | 91,637 |
Non-current liabilities | 64,335 | 57,899 |
Operating revenue | 181,944 | 189,255 |
Profit (loss) for the year | 9,332 | (23,730) |
Other comprehensive income(loss) | (49) | 1,977 |
Total comprehensive income(loss) | 9,283 | (21,753) |
K-Realty CR-REITs No.1 [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets |  | 208,825 |
Operating revenue |  | 425,363 |
Profit (loss) for the year |  | 180,437 |
Total comprehensive income(loss) |  | 180,437 |
Dividends received from associates |  | 40,142 |
KIF Investment Fund [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 98,132 | 117,172 |
Non-current assets | 414,804 | 419,632 |
Operating revenue | 19,916 | 58,791 |
Profit (loss) for the year | 7,505 | 50,107 |
Other comprehensive income(loss) | (11,779) | (6,847) |
Total comprehensive income(loss) | (4,274) | 43,260 |
Dividends received from associates | 6,531 | ₩ 5,640 |
Megazone Cloud Corporation [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 857,089 |  |
Non-current assets | 202,767 |  |
Current liabilities | 330,619 |  |
Non-current liabilities | 94,202 |  |
Operating revenue | 1,261,228 |  |
Profit (loss) for the year | (293,186) |  |
Other comprehensive income(loss) | (6,609) |  |
Total comprehensive income(loss) | (299,795) |  |
IGIS No. 4681 General Private Real Estate Investment Company [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 52,851 |  |
Current liabilities | 12 |  |
Operating revenue | 9 |  |
Profit (loss) for the year | (3,161) |  |
Total comprehensive income(loss) | (3,161) |  |
KT-DSC creative economy youth start-up investment fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 908 |  |
Non-current assets | 76,884 |  |
Current liabilities | 362 |  |
Operating revenue | 19,931 |  |
Profit (loss) for the year | (53) |  |
Total comprehensive income(loss) | (53) |  |
IGIS Professional Investors Private Investment Real Estate Investment LLC No.395 [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 9,344 |  |
Non-current assets | 127,321 |  |
Current liabilities | 90,545 |  |
Profit (loss) for the year | (474) |  |
Total comprehensive income(loss) | ₩ (474) |  |

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