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Share Capital - Summary of Share Capital (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of classes of share capital [Line Items]
Ordinary Shares	₩ 1,564,499	₩ 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
Par value per share	₩ 5,000	₩ 5,000
Ordinary Shares	₩ 1,564,499	₩ 1,564,499

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The nominal value of capital issued.

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The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

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