XML 40 R28.htm IDEA: XBRL DOCUMENT
v3.19.1

Share Capital | 12 Months Ended
--- | ---
Dec. 31, 2018
Text block [abstract] |
Share Capital |
22. | Share Capital
As at December 31, 2017 and 2018, the Group’s number of authorized shares is one billion.
|  | December 31, 2017 |  |  | December 31, 2018 |
|  | Number of outstanding shares |  |  | Par value per share (Korean won) |  |  | Ordinary Shares (in millions of Korean won) |  |  | Number of outstanding shares |  |  | Par value per share (Korean won) |  |  | Ordinary Shares (in millions of Korean won) |
Ordinary shares1 |  |  | 261,111,808 |  |  | ￦ | 5,000 |  |  | ￦ | 1,564,499 |  |  |  | 261,111,808 |  |  | ￦ | 5,000 |  |  | ￦ | 1,564,499 |
| 1 | The Group retired 51,787,959 treasury shares against retained earnings. Therefore, the ordinary shares amount differs from the amount resulting from multiplying the number of shares issued.

X
- Definition The disclosure of issued capital. [Refer: Issued capital] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_10_e&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DisclosureOfIssuedCapitalExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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