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Construction Services Contracts, Continued (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accumulated earned revenue, expense and others [Abstract]    
Accumulated earned revenue ₩ 18,236,992 ₩ 15,314,737
Accumulated expense 16,937,772 14,396,890
Accumulated profit 1,299,220 917,847
Unearned advance receipts 0 0
Contract with Customer, Asset and Liability [Abstract]    
Assets [1] 55,755 44,930
Liabilities [2] ₩ 542,921 ₩ 651,985
[1] Included in trade and other receivables, net, in the consolidated statements of financial position.
[2] Included in non-financial liabilities in the consolidated statements of financial position.