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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018 | Jan. 01, 2017
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items] |  |  |  |  |
Current assets | ₩ 12,157,814 | ₩ 9,828,525 |  | ₩ 11,117,433 | ₩ 9,866,302
Non-current assets | 20,316,306 | 20,067,196 |  | 20,135,256 | 20,948,278
Current liabilities | 9,394,123 | 9,474,162 |  | 9,744,055 | 9,539,195
Non-current liabilities | 8,421,507 | 7,238,205 |  | ₩ 7,318,441 | ₩ 8,358,443
Operating revenue | 23,436,050 | 23,546,929 | ₩ 23,164,202 |  |
Profit (loss) for the year | 719,412 | 546,341 | 831,845 |  |
Other comprehensive income | (54,628) | (68,288) | (5,670) |  |
Total comprehensive income | 664,784 | 478,053 | ₩ 826,175 |  |
Korea Information & Technology Fund [member] |  |  |  |  |
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items] |  |  |  |  |
Current assets | 118,024 | 144,874 |  |  |
Non-current assets | 326,740 | 273,727 |  |  |
Operating revenue | 59,524 | 36,462 |  |  |
Profit (loss) for the year | 45,110 | 12,825 |  |  |
Other comprehensive income | (13,422) | 1,868 |  |  |
Total comprehensive income | 31,688 | 14,693 |  |  |
Dividends received from associates | 1,842 | 739 |  |  |
KT-SB Venture Investment Fund [member] |  |  |  |  |
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items] |  |  |  |  |
Current assets | 4,322 | 120 |  |  |
Non-current assets | 4,624 | 5,770 |  |  |
Current liabilities | 6 | 6 |  |  |
Operating revenue |  | 3 |  |  |
Profit (loss) for the year | 3,056 | (1,449) |  |  |
Total comprehensive income | 3,056 | (1,449) |  |  |
KT-IBKC future investment fund [member] |  |  |  |  |
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items] |  |  |  |  |
Current assets | 19,922 | 5,499 |  |  |
Non-current assets |  | 16,302 |  |  |
Current liabilities |  | 152 |  |  |
Operating revenue | 2,665 | 15 |  |  |
Profit (loss) for the year | 2,057 | (593) |  |  |
Total comprehensive income | 2,057 | (593) |  |  |
KT-CKP New Media Investment Fund [member] |  |  |  |  |
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items] |  |  |  |  |
Current assets | 25 | 287 |  |  |
Non-current assets | 540 | 4,333 |  |  |
Operating revenue | 371 | 1,593 |  |  |
Profit (loss) for the year | (629) | 1,632 |  |  |
Total comprehensive income | (629) | 1,632 |  |  |
K Bank Inc. [member] |  |  |  |  |
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items] |  |  |  |  |
Current assets | 2,094,152 | 1,258,969 |  |  |
Non-current assets | 90,505 | 92,137 |  |  |
Current liabilities | 1,901,389 | 1,116,154 |  |  |
Non-current liabilities | 3,185 | 1,177 |  |  |
Operating revenue | 66,787 | 20,926 |  |  |
Profit (loss) for the year | (79,671) | (83,787) |  |  |
Other comprehensive income | 1,432 | (746) |  |  |
Total comprehensive income | ₩ (78,440) | ₩ (84,533) |  |  |

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