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Related Party Transactions - Summary of Significant Transactions with Related Parties (Parenthetical) (Detail) ₩ in Millions | 12 Months Ended
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Dec. 31, 2015 KRW (₩)
KT Rental Co., Ltd. and KT Capital Co., Ltd. [member] |
Disclosure of transactions between related parties [Line Items] |
Operating income discontinued operations | ₩ 6,634

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

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- Definition Operating income discontinued operations. + References No definition available. + Details
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Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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