XML 77 R66.htm IDEA: XBRL DOCUMENT
v3.22.1

Net Defined Benefit Liabilities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Statement [LineItems] |
Summary of Amount Recognized in the Statements of Financial Position and Defined Benefit Obligations | The amounts recognized in the statements of financial position as at December 31, 2020 and 2021, are determined as follows:
(In millions of Korean won) |  | December 31, 2020 |  |  | December 31, 2021 |
Present value of defined benefit obligations |  | ￦ | 2,556,712 |  |  | ￦ | 2,494,930 |
Fair value of plan assets |  |  | (2,189,375 | ) |  |  | (2,314,632 | )
Liabilities in the statement of financial position |  | ￦ | 378,087 |  |  | ￦ | 197,883 |
Assets in the statement of financial position |  | ￦ | 10,750 |  |  | ￦ | 17,585 |
Summary of Changes in the Defined Benefit Obligations | Changes in the defined benefit obligations for the years ended December 31, 2020 and 2021, are as follows:
(In millions of Korean won) |  | 2020 |  |  | 2021 |
Beginning |  | ￦ | 2,427,351 |  |  | ￦ | 2,556,712 |
Current service cost |  |  | 248,047 |  |  |  | 249,125 |
Interest expense |  |  | 45,083 |  |  |  | 44,905 |
Benefit paid |  |  | (258,866 | ) |  |  | (310,766 | )
Changes due to settlements of plan & Past Service Cost |  |  | 1,075 |  |  |  | (681 | )
Remeasurements: |  |  |  |  |  |  |  |
Actuarial gains and losses arising from changes in demographic assumptions |  |  | 5,191 |  |  |  | (8,375 | )
Actuarial gains and losses arising from changes in financial assumptions |  |  | 17,077 |  |  |  | (61,002 | )
Actuarial gains and losses arising from experience adjustments |  |  | 57,703 |  |  |  | (5,271 | )
Changes in scope of consolidation |  |  | 14,051 |  |  |  | 30,283 |
Ending |  | ￦ | 2,556,712 |  |  | ￦ | 2,494,930 |
Changes in the fair value of plan assets for the years ended December 31, 2020 and 2021, are as follows:
(In millions of Korean won) |  | 2020 |  |  | 2021 |
Beginning |  | ￦ | 2,069,710 |  |  | ￦ | 2,189,375 |
Interest income |  |  | 38,590 |  |  |  | 39,858 |
Remeasurements: |  |  |  |  |  |  |  |
Return on plan assets (excluding amounts included in interest income) |  |  | 2,589 |  |  |  | (130 | )
Benefits paid |  |  | (213,953 | ) |  |  | (271,506 | )
Employer contributions |  |  | 284,243 |  |  |  | 325,818 |
Changes in scope of consolidation |  |  | 8,196 |  |  |  | 31,217 |
Ending |  | ￦ | 2,189,375 |  |  | ￦ | 2,314,632 |
Summary of Amounts Recognized in the Operating expenses of the Consolidated Statements of Operations | Amounts recognized in the ‘Operating expenses’ of the consolidated statements of profit or loss for the years ended December 31, 2019, 2020 and 2021, are as follows:
(In millions of Korean won) |  | 2019 |  |  | 2020 |  |  | 2021 |
Current service cost |  | ￦ | 243,598 |  |  | ￦ | 248,047 |  |  | ￦ | 249,125 |
Net Interest cost |  |  | 12,017 |  |  |  | 6,494 |  |  |  | 5,047 |
Changes due to settlements of plan & Past Service Cost |  |  | 910 |  |  |  | 1,075 |  |  |  | (681 | )
Transfer out |  |  | (16,215 | ) |  |  | (16,514 | ) |  |  | (16,660 | )
Total expenses |  | ￦ | 240,310 |  |  | ￦ | 239,102 |  |  | ￦ | 236,831 |
Summary of Principal Actuarial Assumptions | Principal actuarial assumptions used are as follows:
|  | December 31, 2019 |  |  | December 31, 2020 |  |  | December 31, 2021 |
Discount rate |  |  | 1.97% |  |  |  | 1.93% |  |  |  | 2.55% |
Future salary increase |  |  | 4.92% |  |  |  | 4.88% |  |  |  | 5.10% |
Summary of Sensitivity of the Defined Benefit Obligations | The sensitivity of the defined benefit obligations as at December 31, 2021, to changes in the principal assumptions is:
(In percentage, in millions of Korean won) |  | Effect on defined benefit obligation |
|  | Changes in assumption |  | Increase in assumption |  |  | Decrease in assumption |
Discount rate |  | 0.5% point |  |  | ￦ (148,019) |  |  | ￦ | 159,360 |
Salary growth rate |  | 0.5% point |  |  | 152,609 |  |  |  | (142,660 | )
Summary of Expected Maturity Analysis of Undiscounted Pension Benefits | The expected maturity analysis of undiscounted pension benefits as at December 31, 2021, is as follows:
(In millions of Korean won) |  | Less than 1 year |  |  | Between 1-2 years |  |  | Between 2-5 years |  |  | Over 5 years |  |  | Total |
Pension benefits |  | ￦ | 210,751 |  |  | ￦ | 303,737 |  |  | ￦ | 833,009 |  |  | ￦ | 1,964,398 |  |  | ￦ | 3,311,895 |

X
- Definition The disclosure of additional information about defined benefit plans necessary to meet the objectives of IAS 19. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 137 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_137&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DisclosureOfAdditionalInformationAboutDefinedBenefitPlansExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of a net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of a sensitivity analysis for significant actuarial assumptions used to determine the present value of a defined benefit obligation. [Refer: Actuarial assumptions [member]; Defined benefit obligation, at present value] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of actuarial assumption of discount rates explanatory. + References No definition available. + Details
Name: | kt_DisclosureOfActuarialAssumptionOfDiscountRatesExplanatoryTextBlock
Namespace Prefix: | kt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of changes in defined benefit obligations. + References No definition available. + Details
Name: | kt_DisclosureOfChangesInDefinedBenefitObligationsExplanatory
Namespace Prefix: | kt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of expected maturity analysis of undiscounted pension benefits. + References No definition available. + Details
Name: | kt_DisclosureOfExpectedMaturityAnalysisOfUndiscountedPensionBenefitsExplanatory
Namespace Prefix: | kt_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | kt_StatementLineItems
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration