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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | ₩ 11,976,685 | ₩ 12,157,814 |
Non-current assets | 22,176,723 | 20,316,306 |
Current liabilities | 10,111,455 | 9,394,123 |
Non-current liabilities | 8,897,863 | 8,421,507 |
Operating revenue | 24,899,189 | 23,436,050 | ₩ 23,546,929
Profit (loss) for the year | 699,274 | 719,412 | 546,341
Other comprehensive income(loss) | 172,338 | (54,628) | (68,288)
Total comprehensive income(loss) | 871,612 | 664,784 | ₩ 478,053
Korea Information & Technology Fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 113,233 | 118,024 |
Non-current assets | 378,691 | 326,740 |
Operating revenue | 70,565 | 59,524 |
Profit (loss) for the year | 53,867 | 45,110 |
Other comprehensive income(loss) | 6,132 | (13,422) |
Total comprehensive income(loss) | 59,999 | 31,688 |
Dividends received from associates | 4,280 | 1,842 |
KT-SB Venture Investment Fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets |  | 4,322 |
Non-current assets |  | 4,624 |
Current liabilities |  | 6 |
Profit (loss) for the year |  | 3,056 |
Total comprehensive income(loss) |  | 3,056 |
KT-IBKC future investment fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 28,200 | 19,922 |
Operating revenue | 1,694 | 2,665 |
Profit (loss) for the year | 779 | 2,057 |
Total comprehensive income(loss) | 779 | 2,057 |
KT-CKP New Media Investment Fund [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 3 | 25 |
Non-current assets | 267 | 540 |
Operating revenue | 56 | 371 |
Profit (loss) for the year | 55 | (629) |
Total comprehensive income(loss) | 55 | (629) |
K Bank Inc. [member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Current assets | 2,480,065 | 2,094,152 |
Non-current assets | 78,566 | 90,505 |
Current liabilities | 2,350,375 | 1,901,389 |
Non-current liabilities | 3,784 | 3,185 |
Operating revenue | 92,712 | 66,787 |
Profit (loss) for the year | (100,773) | (79,671) |
Other comprehensive income(loss) | (23) | 1,432 |
Total comprehensive income(loss) | ₩ (100,796) | ₩ (78,440) |

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