XML 48 R33.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Financial Income and Costs | 12 Months Ended
--- | ---
Dec. 31, 2017
Text block1 [abstract] |
Financial Income and Costs |
27. | Financial Income and Costs
Details of financial income for the years ended December 31, 2015, 2016 and 2017, are as follows:
(In millions of Korean won) |  | 2015 |  |  | 2016 |  |  | 2017 |
Interest income |  | ￦ | 70,035 |  |  | ￦ | 115,686 |  |  | ￦ | 93,078 |
Gain on foreign currency transactions |  |  | 18,766 |  |  |  | 24,915 |  |  |  | 79,653 |
Gain on foreign currency translation |  |  | 11,280 |  |  |  | 12,165 |  |  |  | 225,580 |
Gain on settlement of derivatives |  |  | 368 |  |  |  | 8,515 |  |  |  | — |
Gain on valuation of derivatives |  |  | 141,512 |  |  |  | 109,436 |  |  |  | 57 |
Others |  |  | 30,899 |  |  |  | 25,422 |  |  |  | 7,960 |
Total |  | ￦ | 272,860 |  |  | ￦ | 296,139 |  |  | ￦ | 406,328 |
Details of financial expenses for the years ended December 31, 2015, 2016 and 2017, are as follows:
(In millions of Korean won) |  | 2015 |  |  | 2016 |  |  | 2017 |
Interest expenses |  | ￦ | 385,925 |  |  | ￦ | 337,219 |  |  | ￦ | 302,464 |
Loss on foreign currency transactions |  |  | 42,831 |  |  |  | 37,936 |  |  |  | 40,303 |
Loss on foreign currency translation |  |  | 175,613 |  |  |  | 121,949 |  |  |  | 12,239 |
Loss on settlement of derivatives |  |  | 6,280 |  |  |  | 632 |  |  |  | 58,569 |
Loss on valuation of derivatives |  |  | 1,733 |  |  |  | 138 |  |  |  | 209,582 |
Loss on disposal of trade receivables |  |  | 2,539 |  |  |  | 15,838 |  |  |  | 20,355 |
Impairment loss on available-for-sale financial assets |  |  | 1,805 |  |  |  | 966 |  |  |  | 9 |
Others |  |  | 28,605 |  |  |  | 409 |  |  |  | 1,010 |
|  | ￦ | 645,331 |  |  | ￦ | 515,087 |  |  | ￦ | 644,531 |

X
- Definition The disclosure of finance income (cost). [Refer: Finance income (cost)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Text block1 [abstract] + References No definition available. + Details
Name: | kt_TextBlock1Abstract
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration