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Finance Income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest Income [Abstract]      
Cash and cash equivalents ₩ 35,474 ₩ 61,380 ₩ 54,687
Available-for-sale financial assets 290   29
Held-to-maturity investments 82 97 99
Loans and receivables 30,014 25,106 28,586
Short-term financial instrument 29,412 45,763 46,921
Long-term financial instrument 8,144 7,195 10,492
Trade and other receivables 102,727 102,237 100,771
Total Interest Income 206,143 241,778 241,585
Dividend income 11,477 9,446 14,069
Gains on disposal of financial assets 1,130 1,482 4
Gains on valuation of Financial assets at fair value through profit or loss 12    
Gains on valuation of derivatives 16,165 293,830 610,582
Gains on transaction of derivatives 29,257 45,549 151,851
Gains on foreign currency translation of Finance Income 1,115,832 161,905 127,372
Gains on foreign currency transaction 150,602 37,553 37,377
Other finance income     148
Total Finance Income ₩ 1,530,618 ₩ 791,543 ₩ 1,182,988