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Financial Income and Costs (Tables) | 12 Months Ended
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Dec. 31, 2019
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Summary of Details of Financial Income | Details of financial income for the years ended December 31, 2017, 2018 and 2019, are as follows:
(In millions of Korean won) |  | 2017 |  |  | 2018 |  |  | 2019 |
Interest income |  | ￦ | 93,078 |  |  | ￦ | 244,796 |  |  | ￦ | 282,704 |
Gain on foreign currency transactions |  |  | 79,653 |  |  |  | 17,175 |  |  |  | 24,596 |
Gain on foreign currency translation |  |  | 225,580 |  |  |  | 3,691 |  |  |  | 17,979 |
Gain on settlement of derivatives |  |  | — |  |  |  | 27,950 |  |  |  | 9,016 |
Gain on valuation of derivatives |  |  | 57 |  |  |  | 66,305 |  |  |  | 77,353 |
Others |  |  | 7,960 |  |  |  | 14,326 |  |  |  | 12,747 |
Total |  | ￦ | 406,328 |  |  | ￦ | 374,243 |  |  | ￦ | 424,395 |
Summary of Details of Financial Costs | Details of financial costs for the years ended December 31, 2017, 2018 and 2019, are as follows:
(In millions of Korean won) |  | 2017 |  |  | 2018 |  |  | 2019 |
Interest expenses |  | ￦ | 302,464 |  |  | ￦ | 296,874 |  |  | ￦ | 268,225 |
Loss on foreign currency transactions |  |  | 40,303 |  |  |  | 49,156 |  |  |  | 30,267 |
Loss on foreign currency translation |  |  | 12,239 |  |  |  | 72,642 |  |  |  | 93,977 |
Loss on settlement of derivatives |  |  | 58,569 |  |  |  | — |  |  |  | 20 |
Loss on valuation of derivatives |  |  | 209,582 |  |  |  | 2,045 |  |  |  | 15,867 |
Loss on disposal of trade receivables |  |  | 20,355 |  |  |  | 13,818 |  |  |  | 11,298 |
Impairment loss on available-for-sale financial assets |  |  | 9 |  |  |  | — |  |  |  | — |
Others |  |  | 1,010 |  |  |  | 1,124 |  |  |  | 2,277 |
Total |  | ￦ | 644,531 |  |  | ￦ | 435,659 |  |  | ￦ | 421,931 |

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- Definition The disclosure of finance cost. [Refer: Finance costs] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_10_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The disclosure of finance income. [Refer: Finance income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_10_e&doctype=Standard -URIDate 2019-03-27 + Details
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