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Assets Held-for-Sale (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets Held-for-Sale [Abstract]    
Land ₩ 0 ₩ 23,002
Buildings 1 193
Investments 0 4,921
Others [1] 924 0
Assets Held-for-Sale ₩ 925 ₩ 28,116
[1] As DG Fairhaven Power, LLC were sold after the end of the reporting period, the assets of DG Fairhaven Power, LLC were classified as assets held-for-sale.