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Finance Expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest Expense [Abstract]      
Trade and other payables ₩ 57,160 ₩ 68,375 ₩ 84,527
Short-term borrowings 35,891 6,969 14,627
Long-term borrowings 87,011 91,584 103,503
Debt securities 1,698,232 1,922,900 2,177,855
Other financial liabilities 491,665 482,428 538,680
Interest Expense (Before Capitalizing borrowing costs) 2,369,959 2,572,256 2,919,192
Less: Capitalized borrowing costs (580,407) (819,388) (903,508)
Interest expense 1,789,552 1,752,868 2,015,684
Losses on sale of financial assets 2,343 9 3,008
Impairment of available-for-sale financial assets 2,713 86,703 84,370
Losses on valuation of derivatives 890,832 5,762 17,051
Losses on transaction of derivatives 198,218 101,987 37,262
Losses on foreign currency translation 207,944 406,849 743,283
Losses on foreign currency transaction 35,175 57,889 113,723
Losses on repayment of financial liabilities 5 23,000 33
Other Finance Expenses 1,170 2,020 1,043
Total Finance Expense ₩ 3,127,952 ₩ 2,437,087 ₩ 3,015,457