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Segment Information - Summary of Segment Information (Parenthetical) (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of operating segments [line items] |  |
Long lived assets | ₩ 22,176,723 | ₩ 20,316,306
ICT [member] |  |
Disclosure of operating segments [line items] |  |
Long lived assets | ₩ 13,687,834 |

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