XML 224 R211.htm IDEA: XBRL DOCUMENT
v3.25.1

Financial Risk Management - Summary of Details of Changes in Provisions for Impairment of Trade Receivables and Other Financial Assets at Amortized Costs (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Trade receivables [member] |  |
Disclosure of financial assets [line items] |  |
Beginning balance | ₩ 331,290 | ₩ 343,738
Provision | 95,060 | 69,972
Written-off | (54,528) | (80,126)
Others | 7,804 | (2,294)
Ending balance | 379,626 | 331,290
Financial assets at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Beginning balance | 183,636 | 218,543
Provision | 82,123 | 114,501
Written-off | (105,169) | (150,014)
Others | 44,384 | 15,547
Reversal | (380) | (14,941)
Ending balance | ₩ 204,594 | ₩ 183,636

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of additional allowance for credit losses of financial assets recognised in profit or loss. + References No definition available. + Details
Name: | kt_AdditionalAllowanceRecognisedInProfitOrLossAllowanceForCreditLossesOfFinancialAssets
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of an allowance used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References No definition available. + Details
Name: | kt_AllowanceForCreditLossesOfFinancialAssets
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Increase (decrease) through other changes, allowance account for credit losses of financial asset. + References No definition available. + Details
Name: | kt_IncreaseDecreaseThroughOtherChangesAllowanceAccountForCreditLossesOfFinancialAsset
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The decrease in an allowance for credit losses of financial assets resulting from the reversal of impairment. + References No definition available. + Details
Name: | kt_ReversalAllowanceForCreditLossesOfFinancialAssets
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Write off or transfer out of allowance account for credit losses of financial asset. + References No definition available. + Details
Name: | kt_WriteOffOrTransferOutOfAllowanceAccountForCreditLossesOfFinancialAsset
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtAmortisedCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |