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General Information - Additional Information (Details) ₩ in Millions | Dec. 31, 2020 KRW (₩) Market shares | Dec. 31, 2019 KRW (₩) | Feb. 08, 2005 shares
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General Information [Line Items] |  |  |
Number of international markets | Market | 93 |  |
Number of shares issued | shares | 6,948,900 |  |
Share capital | ₩ | ₩ 3,474 | ₩ 3,474 |
American Depositary Shares |  |  |
General Information [Line Items] |  |  |
Number of shares issued | shares |  |  | 1,400,000
Share capital | ₩ | ₩ 3,474 |  |

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