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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Treasury Stock (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Treasury Shares [abstract]
Number of shares	16,014,753	16,140,165
Amounts (In millions of Korean won)	₩ 853,108	₩ 859,789

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- Definition

An entity’s own equity instruments, held by the entity or other members of the consolidated group.

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Disclosure of treasury shares.

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Number of treasury shares.

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