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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
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | ₩ 11,858,350 | ₩ 11,154,180 |
Non-current assets | 25,300,991 | 22,508,365 |
Current liabilities | 10,072,432 | 9,192,472 |
Non-current liabilities | 10,519,748 | 8,918,640 |
Operating revenue | 25,205,659 | 24,440,647 | ₩ 24,899,189
Profit (loss) for the year | 1,459,395 | 746,256 | 695,868
Other comprehensive income(loss) | 165,567 | 23,255 | 172,338
Total comprehensive income(loss) | 1,624,962 | 769,511 | ₩ 868,206
Korea Information & Technology Fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 117,172 | 107,652 |
Non-current assets | 419,632 | 402,812 |
Operating revenue | 58,791 | 54,473 |
Profit (loss) for the year | 50,107 | 36,615 |
Other comprehensive income(loss) | (6,847) | 9,647 |
Total comprehensive income(loss) | 43,260 | 46,262 |
Dividends received from associates | 5,640 | 9,241 |
KT-IBKC future investment fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 24,163 | 32,379 |
Operating revenue | 5,912 | 6,551 |
Profit (loss) for the year | 3,184 | 4,179 |
Total comprehensive income(loss) | 3,184 | 4,179 |
K Bank [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 13,263,658 | 4,255,620 |
Non-current assets | 70,362 | 74,193 |
Current liabilities | 11,594,316 | 3,752,838 |
Non-current liabilities | 2,467 | 88,155 |
Operating revenue | 287,775 | 80,301 |
Profit (loss) for the year | 21,728 | (105,374) |
Other comprehensive income(loss) | (28,211) | (1,126) |
Total comprehensive income(loss) | (6,483) | (106,500) |
Hyundai Robotics Co., Ltd. [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 308,776 | 315,886 |
Non-current assets | 120,221 | 125,619 |
Current liabilities | 91,637 | 80,615 |
Non-current liabilities | 57,899 | 59,324 |
Operating revenue | 189,255 | 195,311 |
Profit (loss) for the year | (23,730) | (642) |
Other comprehensive income(loss) | 1,977 | 11,573 |
Total comprehensive income(loss) | (21,753) | ₩ 10,931 |
KREALTYCR REITs No One [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 |  |

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