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Finance Income (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest Income |  |  |
Cash and cash equivalents | ₩ 40,704 | ₩ 35,474 | ₩ 61,380
Available-for-sale financial assets |  | 290 | 0
Financial assets at fair value through profit or loss | 21,713 |  |
Financial assets at amortized cost | 89 | 0 | 0
Held-to-maturity investments | 0 | 82 | 97
Loans and receivables | 21,925 | 30,014 | 25,106
Short-term financial instrument | 41,025 | 29,412 | 45,763
Long-term financial instrument | 7,920 | 8,144 | 7,195
Other financial assets | 1 | 0 | 0
Trade and other receivables | 90,390 | 102,727 | 102,237
Total Interest Income | 223,767 | 206,143 | 241,778
Dividend income | 12,777 | 11,477 | 9,446
Gains on disposal of financial assets | 1,838 | 1,130 | 1,482
Gains on valuation of Financial assets at fair value through profit or loss | 8,495 | 12 | 0
Gains on valuation of derivatives | 199,943 | 16,165 | 293,830
Gains on transaction of derivatives | 179,745 | 29,257 | 45,549
Gains on foreign currency translation of Finance Income | 143,254 | 1,115,832 | 161,905
Gains on foreign currency transaction | 27,051 | 150,602 | 37,553
Total Finance Income | ₩ 796,870 | ₩ 1,530,618 | ₩ 791,543

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