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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | ₩ 11,154,180 | ₩ 11,975,659 |
Non-current assets | 22,508,365 | 22,656,555 |
Current liabilities | 9,192,472 | 10,148,054 |
Non-current liabilities | 8,918,640 | 9,343,476 |
Operating revenue | 24,440,647 | 24,899,189 | ₩ 23,436,050
Profit (loss) for the year | 746,256 | 695,868 | 719,412
Other comprehensive income(loss) | 23,255 | 172,338 | (54,628)
Total comprehensive income(loss) | 769,511 | 868,206 | ₩ 664,784
Korea Information & Technology Fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 107,652 | 113,233 |
Non-current assets | 402,812 | 378,691 |
Operating revenue | 54,473 | 70,577 |
Profit (loss) for the year | 36,615 | 53,867 |
Other comprehensive income(loss) | 9,647 | 6,132 |
Total comprehensive income(loss) | 46,262 | 59,999 |
Dividends received from associates | 9,241 | 4,280 |
KT-IBKC future investment fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 32,379 | 28,200 |
Operating revenue | 6,551 | 1,694 |
Profit (loss) for the year | 4,179 | 779 |
Total comprehensive income(loss) | 4,179 | 779 |
KT-CKP New Media Investment Fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets |  | 3 |
Non-current assets |  | 267 |
Operating revenue |  | 56 |
Profit (loss) for the year |  | 55 |
Total comprehensive income(loss) |  | 55 |
K Bank Inc. [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 4,255,620 | 2,480,065 |
Non-current assets | 74,193 | 78,566 |
Current liabilities | 3,752,838 | 2,350,375 |
Non-current liabilities | 88,155 | 3,784 |
Operating revenue | 80,301 | 92,720 |
Profit (loss) for the year | (105,374) | (100,773) |
Other comprehensive income(loss) | (1,126) | (23) |
Total comprehensive income(loss) | (106,500) | ₩ (100,796) |
Hyundai Robotics Co., Ltd. [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 315,886 |  |
Non-current assets | 125,619 |  |
Current liabilities | 80,615 |  |
Non-current liabilities | 59,324 |  |
Operating revenue | 195,311 |  |
Profit (loss) for the year | (642) |  |
Other comprehensive income(loss) | 11,573 |  |
Total comprehensive income(loss) | ₩ 10,931 |  |

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