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Share Capital (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Share Capital | As of December 31, 2016 and 2017, the Group’s number of authorized shares is one billion.
|  | 2016 |  |  | 2017 |
|  | Number of outstanding shares |  |  | Par value per share (Korean won) |  |  | Ordinary Shares (in millions of Korean won) |  |  | Number of outstanding shares |  |  | Par value per share (Korean won) |  |  | Ordinary Shares (in millions of Korean won) |
Ordinary shares1 |  |  | 261,111,808 |  |  | ￦ | 5,000 |  |  | ￦ | 1,564,499 |  |  |  | 261,111,808 |  |  | ￦ | 5,000 |  |  | ￦ | 1,564,499 |
| 1 | The Group retired 51,787,959 treasury shares against retained earnings. Therefore, the ordinary shares amount differs from the amount resulting from multiplying the number of shares issued by ￦5,000 par value per share of ordinary shares.

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