XML 226 R214.htm IDEA: XBRL DOCUMENT
v3.23.1

Financial Risk Management - Summary of Cash Outflow and Inflow of Derivatives Settled Gross or Net are Undiscounted Contractual Cash Flow (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Derivatives held for trading |  |  |
Outflows | ₩ 102,924 | ₩ 158,284 |
Derivatives settled gross |  |  |
Outflow | 2,994,649 | 3,078,733 | ₩ 2,925,965
Inflow | 3,258,353 | 3,167,878 | 2,804,618
Less than 1 year [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 0 | 0 |
Derivatives settled gross |  |  |
Outflow | 472,005 | 843,489 | 248,300
Inflow | 550,478 | 856,508 | 249,301
1-5 years [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 101,994 | 158,284 |
Derivatives settled gross |  |  |
Outflow | 2,493,858 | 1,857,942 | 2,179,046
Inflow | 2,670,002 | 1,917,236 | 2,074,747
More than 5 years [member] |  |  |
Derivatives held for trading |  |  |
Outflows | 930 | 0 |
Derivatives settled gross |  |  |
Outflow | 28,786 | 377,302 | 498,619
Inflow | ₩ 37,873 | ₩ 394,134 | ₩ 480,570

X
- Definition Derivatives held for trading. + References No definition available. + Details
Name: | kt_DerivativesHeldForTradingAbstract
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivatives held for trading or net undiscounted contractual cash outflow. + References No definition available. + Details
Name: | kt_DerivativesHeldForTradingOrNetUndiscountedContractualCashOutflow
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Derivatives settled gross. + References No definition available. + Details
Name: | kt_DerivativesSettledGrossAbstract
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivatives settled gross or net undiscounted contractual cash inflow. + References No definition available. + Details
Name: | kt_DerivativesSettledGrossOrNetUndiscountedContractualCashInflow
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivatives settled gross or net undiscounted contractual cash outflow. + References No definition available. + Details
Name: | kt_DerivativesSettledGrossOrNetUndiscountedContractualCashOutflow
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |