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Share Capital - Summary of Share Capital (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of classes of share capital [Line Items] |  |
Ordinary Shares | ₩ 1,564,499 | ₩ 1,564,499
Ordinary shares [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Number of outstanding shares | 261,111,808 | 261,111,808
2016 Par value per share | ₩ 5,000 | ₩ 5,000
Ordinary Shares | ₩ 1,564,499 | ₩ 1,564,499

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