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Leases - Summary of Details of Finance Lease Assets (Detail) ₩ in Millions | Dec. 31, 2018 KRW (₩)
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Disclosure of recognised finance lease as assets by lessee [Line Items] |
Finance lease assets | ₩ 190,811
Gross carrying amount [member] |
Disclosure of recognised finance lease as assets by lessee [Line Items] |
Finance lease assets | 343,055
Accumulated depreciation and amortisation [member] |
Disclosure of recognised finance lease as assets by lessee [Line Items] |
Finance lease assets | ₩ (152,244)

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- Definition Disclosure of recognised finance lease assets. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Recognized finance lease assets. + References No definition available. + Details
Name: | kt_RecognizedFinanceLeaseAssets
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_AccumulatedDepreciationAndAmortisationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |