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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Treasury Stock (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Miscellaneous equity [abstract] |  |
Number of shares (in shares) | 15,870,258 | 15,967,040
Amounts (In millions of Korean won) | ₩ 825,838 | ₩ 830,874

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