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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
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Dec. 31, 2023 | Dec. 31, 2022
Trade receivables [member] |  |
Disclosure of financial assets [line items] |  |
Beginning balance | ₩ 343,738 | ₩ 349,725
Provision | 69,972 | 64,522
Written-off | (80,126) | (68,298)
Others | (2,294) | (2,211)
Ending balance | 331,290 | 343,738
Financial assets at amortised cost, class [member] |  |
Disclosure of financial assets [line items] |  |
Beginning balance | 218,543 | 201,387
Provision | 114,501 | 65,941
Written-off | (150,014) | (51,383)
Others | 15,547 | 3,448
Reversal | (14,941) | (850)
Ending balance | ₩ 183,636 | ₩ 218,543

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- Definition The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expired 2023-01-01 -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expired 2023-01-01 -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2023-03-23 + Details
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Balance Type: | credit
Period Type: | instant

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- 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
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Balance Type: | na
Period Type: | duration

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- Definition The decrease in an allowance account for credit losses of financial assets resulting from the reversal of impairment. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expired 2023-01-01 -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2023-03-23 + Details
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Balance Type: | na
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- Definition Increase (decrease) through other changes, allowance account for credit losses of financial asset. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
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- Definition Write off or transfer out of allowance account for credit losses of financial asset. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |